JP2001053520A - Antenna system and portable radio device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid deterioration of a speaking quality by providing an unbalanced transmission line and a balance and unbalance converting means for giving balance/unbalance converting operation between first and second antenna elements, to feed power to the first and second antenna elements at pushing in and drawing out of the first antenna element. SOLUTION: At a housing case 27, a rod antenna 28 and a helical antenna 29 constitute an antenna system 30, forming a balance-type exciting form by making their electrical lengths nearly the same value to be electrically symmetrical. Power is fed to the antenna 28 and the antenna 29 from a transmission/ reception circuit 31 successively via an unbalanced transmission line 32 and a balun 38 to operate the antenna 28 and the antenna 29 and in order to prevent flowing of a leaked current i2 to the ground side 37 of the line 32 from the antenna 29 by the converting operation of the balance/unbalance of the balun 38, a shield case 33 is made to function as a shield plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device and a portable wireless device, and is suitably applied to, for example, a portable telephone.

[0002]

2. Description of the Related Art Conventionally, in this type of portable telephone,
The size and weight have been reduced to improve portability. Along with this, whip antenna type antenna devices provided in mobile phones have been actively developed,
As this type of mobile phone, there is a mobile phone configured as shown in FIGS.

In the portable telephone 1 having such a configuration, a whip antenna type antenna device 3 is provided in a housing case 2 made of a non-conductive material such as a synthetic resin.

The antenna device 3 has an antenna unit 6 provided with a rod antenna 4 made of a conductive rod-shaped wire and a helical antenna 5 formed by spirally winding a conductive wire. The direction in which the antenna section 6 is pushed into the inside of the housing case 2 indicated by an arrow a at the upper end 2A of the housing case 2 (hereinafter referred to as the pushing direction) and the opposite direction of the housing case 2 Direction from the inside to the outside (hereinafter referred to as the drawing direction)
Are provided so as to be able to be pushed in and pulled out along the line.

In the antenna section 6, a first feeding member 7 made of a conductive material and having a projection 7A is electrically and mechanically connected to the lower end of the rod antenna 4, and is connected to the upper end of the rod antenna 4. A connection portion 8 made of a non-conductive material is mechanically connected.

A second power supply member 9 made of a conductive material is electrically and mechanically connected to the lower end of the helical antenna 5, and the second power supply member 9 is mechanically connected to the connection portion 8. I have. Thus, in the antenna section 6, the lot antenna 4 and the helical antenna 5 are mechanically connected by the connection section 8, but are electrically separated.

The rod antenna 4 is covered with a rod antenna cover 10 and the helical antenna 5 is formed as a cap-shaped helical antenna cover 11.
It is stored so that it does not directly touch the human body.

On the other hand, a circuit board (not shown) on which various circuit elements such as a transmission / reception circuit 12 and a matching circuit 13 are mounted, and a ground member made of a conductive material which covers the circuit board are provided inside the housing case 2. And a shield case (not shown).

An antenna feed terminal 14 made of a conductive material electrically connected to the matching circuit 13 is provided inside the upper end 2A of the housing case 2. When the antenna unit 6 is pushed in and pulled out, the antenna feed terminal 14 is provided. 14 is electrically connected to only one of the rod antenna 4 and the helical antenna 5.

In practice, in the antenna device 3, when the antenna section 6 is pushed in, the helical antenna cover 11
Is pushed in the pushing direction and hits the upper end 2 </ b> A of the housing case 2, the rod antenna 4 is inserted into the housing case 2.
Is pushed in and stored, and at this time, the second power supply member 9 is electrically connected to the antenna power supply terminal 14.

In the antenna device 3, the transmitting / receiving circuit 12, the matching circuit 13, the antenna feed terminal 14
And the helical antenna 5 via the second power feeding member 9 sequentially.
Helical antenna 5 is operated as an antenna.

At this time, in the antenna device 3, the rod antenna 4 is electrically separated from the antenna feed terminal 14 by the connecting portion 8 so as not to operate as an antenna.

On the other hand, in the antenna device 3,
When the antenna unit 6 is pulled out, the second antenna cover 1 is held in a state where the rod antenna 4 is housed inside the housing case 2.
When the pin 1 is pinched and pulled in the pull-out direction, the rod antenna 4 is pulled out from the upper end 2A of the housing case 2 and the projection 7A of the first power supply member 7 is brought into contact with the antenna power supply terminal 14 at this time. Thereby, the first power supply member 7 is electrically connected to the antenna power supply terminal 14.

In the antenna device 3, the transmitting and receiving circuit 12, the matching circuit 13, the antenna feed terminal 14
The rod antenna 4 is operated as an antenna by being sequentially fed to the rod antenna 4 via the first feeding member 7.

At this time, in the antenna device 3, the helical antenna 5 is electrically separated from the antenna feed terminal 14 by the connecting portion 8 so as not to operate as an antenna.

Incidentally, when the rod antenna 4 and the helical antenna 5 are each operated as an antenna,
The matching circuit 13 matches the impedance of the rod antenna 4 and the helical antenna 5 with the unbalanced transmission line 16.

The shield case functions as a ground for various circuit elements, and also prevents external noise radio waves and radio waves radiated from the antenna unit 6 from entering the various circuit elements mounted on the circuit board. It also functions as an electrical shield.

As a result, in this portable telephone 1,
When the antenna section 6 is pulled out, the rod antenna 4 is pulled out from the housing case 2, and a transmission signal composed of a high-frequency signal is transmitted from the transmission / reception circuit 12 to the rod antenna 4 via the matching circuit 13, and is transmitted through the rod antenna 4. And transmits a transmission signal to a base station (not shown), and a reception signal composed of a high-frequency signal transmitted from the base station and received by the rod antenna 4 via a matching circuit 13.
Can be sent to

In the portable telephone 1, when the antenna section 6 is pushed in, the rod antenna 4 is housed inside the housing case 2 to prevent the portability from being impaired.
In this state, a transmission signal is transmitted from the transmission / reception circuit 12 to the helical antenna 5 via the matching circuit 13, and the transmission signal is transmitted to the base station via the helical antenna 5 and transmitted from the base station. Thus, the received signal can be transmitted to the transmission / reception circuit 12 via the matching circuit 13.

[0020]

The portable telephone 1 having such a configuration has an unbalanced transmission line 15 formed of, for example, a microstrip line formed on a circuit board. , And the rod antenna 4 or the helical antenna 5 are electrically connected via the matching circuit 13 in order, and the ground side of the unbalanced transmission line 15 is grounded to the shield case.

Therefore, in this portable telephone 1, FIG.
As shown in FIGS. 9A and 9B, power is supplied to the rod antenna 4 or the helical antenna 5 from the transmission / reception circuit 12 via the hot side of the unbalanced transmission line 15 and the matching circuit 13 sequentially, and When the antenna 5 is operated as an antenna, a leakage current i1 flows from the ground side of the unbalanced transmission line 15 to the shield case 16, and the shield case 16 also operates as an antenna.

However, in such a mobile phone 1,
Since the shield case 16 operates as an antenna as described above, when the user grips the housing case 2, the hand covers the shield case 16 via the housing case 2, and as a result, the antenna characteristics of the mobile phone 1 are reduced. There was a problem of deterioration.

The housing case 2 held by the user with the hand while the shield case 16 is operating as an antenna.
Is closer to the head, the head approaches the shield case 16 via the housing case 2, so that the antenna characteristics of the mobile phone 1 are further deteriorated. As a result, there is a problem in that the communication quality is reduced.

Further, when the shield case 16 is brought closer to the user's hand or head, the power per unit time / unit mass (so-called SAR (Specific Absorption Rate)) absorbed by a specific part of the human body increases accordingly. There was a problem to do.

The present invention has been made in view of the above points, and an object of the present invention is to propose an antenna device and a portable wireless device capable of greatly reducing a decrease in communication quality.

[0026]

According to the present invention, there is provided an antenna apparatus comprising: a first antenna element provided so as to be capable of being pushed and pulled out; and a fixed antenna paired with the first antenna element. A second antenna element, an unbalanced transmission line for feeding the first and second antenna elements, and a balanced unbalance between the unbalanced transmission line and the first and second antenna elements. And a balance-unbalance conversion means for performing the above-described conversion operation, and feeds the first and second antenna elements from the unbalanced transmission line via the balance-unbalance conversion means when the first antenna element is pushed in and pulled out. Thus, the first and second antenna elements are operated as antennas.

As a result, when the first and second antenna elements operate as antennas, the unbalanced transmission line is grounded via the unbalanced transmission line due to the unbalanced conversion action of the unbalanced conversion means. Preventing leakage current from flowing from the first or second antenna element to the ground member,
Thus, the ground member can be prevented from operating as an antenna, and the deterioration of antenna characteristics near the human body can be greatly reduced.

According to the present invention, in a portable wireless device having an antenna device, a first antenna element provided in the antenna device so as to be capable of being pushed into and pulled out of a housing case, and a pair with the first antenna element are provided. A fixed second antenna element, an unbalanced transmission line for supplying power to the first and second antenna elements, and a connection between the unbalanced transmission line and the first and second antenna elements. Balanced / unbalanced converting means for performing a balanced / unbalanced converting operation is provided, and when the first antenna element is pushed in and pulled out, the first and second antennas are transmitted from the unbalanced transmission line via the balanced / unbalanced converting means. The elements are fed to operate the first and second antenna elements as antennas.

As a result, when the first and second antenna elements operate as antennas, the unbalanced transmission line is grounded via the unbalanced transmission line due to the unbalanced conversion action of the unbalanced conversion means. Preventing leakage current from flowing from the first or second antenna element to the ground member,
Thus, the ground member can be prevented from operating as an antenna, and the deterioration of antenna characteristics near the human body can be greatly reduced.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

(1) Principle As shown in FIG. 1, the first and second antenna elements 20 which are structurally and electrically symmetric, such as a dipole antenna,
2A and 2B, the first and second antenna elements 20 and 21 have the same amplitude and a phase shift of about 180 degrees from each other, as shown in FIGS. 2A and 2B. The antenna is classified as a balanced antenna because it operates when a voltage is generated and takes a balanced excitation state.

Further, as shown in FIG. 3, for example, a monopole antenna arranged almost vertically on a ground member which can be regarded as being infinite and large in size than a disk having a radius of one wavelength (electric length). As described above, the structure constituted by the ground member 22 which can be regarded as having an infinite size which is structurally asymmetric and the antenna 23 which is arranged almost perpendicularly thereto,
As shown in FIGS. 4A and 4B, the vast ground member 22 has a substantially zero potential, and a voltage that changes at a predetermined cycle is generated in the antenna 23 to operate and take an unbalanced excitation state. It is classified as an unbalanced antenna.

In the unbalanced antenna according to the present invention, since the vast ground member 22 is provided, an image current flowing through the unbalanced antenna can be easily assumed, and the antenna characteristic of the unbalanced antenna is changed to a balanced type. It can be selected almost the same as the antenna.

Further, as shown in FIG. 5, a rod antenna 4 (FIGS. 48A and 48B) or a helical antenna 5 shown in a conventional portable telephone 1 (FIGS. 48A and 48B).
(FIGS. 48A and 48B) and the shield case 16
(FIGS. 49A and 49B) First and second antenna elements 24 and 25 which are structurally and electrically asymmetric.
There is also an antenna composed of

Since the antenna having such a configuration is structurally and electrically asymmetric, it cannot take a balanced excitation mode or an unbalanced excitation mode as shown in FIGS. 6A and 6B, for example. In order to take an intermediate excitation form, an antenna different from a balanced antenna and an unbalanced antenna (hereinafter, referred to as
This is called an antenna in an intermediate excitation state).

FIG. 7 shows a portable telephone 26 according to the present invention.
In the mobile phone 26, although the first and second antenna elements of the mobile phone 26 are structurally asymmetric, such as a rod antenna 28 and a helical antenna 29, By setting the electric lengths of the rod antenna 28 and the helical antenna 29 to substantially the same value, the antenna has an antenna that is electrically symmetrical and assumes a substantially balanced excitation state (hereinafter referred to as a substantially balanced antenna). An antenna device 30 is provided.

In the antenna device 30, the rod antenna 28 and the helical antenna 29 are fed from the transmission / reception circuit 31 via the unbalanced transmission line 32, so that the rod antenna 28 and the helical antenna 29
Are simultaneously operated as antennas.

Incidentally, the antenna used in the antenna device will be classified as a substantially balanced antenna hereinafter, unless otherwise specified, although it is structurally asymmetric but electrically symmetric and assumes a substantially balanced excitation state. .

FIG. 7 shows the transmission / reception circuit 31 arranged outside the shield case 33 inside the housing case 27 for the sake of simplicity, but this transmission / reception circuit 31 is actually a shield It is arranged inside the case 33.

As shown in FIG. 8, when a microstrip line 34 is applied as the unbalanced transmission line 32, the microstrip line 34 is formed on one surface 35A of a dielectric layer 35 having a predetermined thickness.
Is formed, and the ground conductor 37 is formed on the other surface 35B of the dielectric layer 35, so that the strip conductor 36 is on the hot side and the ground conductor 37 is on the ground side.

As described above, in the antenna device 30, as shown in FIG. 9, one rod antenna 28 of a substantially balanced antenna, for example, is connected to the transmitting / receiving circuit via the hot side 36 of the unbalanced transmission line 32. And the other helical antenna 29 is electrically connected to the transmission / reception circuit 31 via the ground side 37 of the unbalanced transmission line 32, and the shield case (via the ground side 37). (Not shown).

In the antenna device 30, however, the rod antenna 28 and the helical antenna 29 take a balanced excitation mode, whereas the unbalanced transmission line 32 takes an unbalanced excitation mode due to the grounding on the ground side 37.
The rod antenna 28
When the helical antenna 29 and the unbalanced transmission line 32 are directly electrically connected, when the rod antenna 28 and the helical antenna 29 operate as antennas, the current unbalance occurs due to the difference in the excitation state. Occurs.

As a result, in the portable telephone 26, a leakage current i2 flows from the helical antenna 29 through the ground side 37 of the unbalanced transmission line 32 to a shield case (not shown) having substantially the same potential as the ground side 37, This causes the shield case to operate as an antenna due to the leakage current i2, so that when the case 27 is covered by the user's hand or head, the antenna characteristics of the mobile phone 26 deteriorate.

Therefore, as shown in FIG. 10, in the antenna device 30 according to the present invention, the unbalanced transmission line 32
A balun (balun: balanced-t) for performing a balance-unbalance conversion operation between the rod antenna 28 and the helical antenna 29
o-unbalanced transformer) 38, and this balun 3
8, the helical antenna 29
Leakage current i to ground side 37 of unbalanced transmission line 32 from
2 prevents the shield case from operating as an antenna due to the leakage current i2.

This balun 38 is, as shown in FIG.
It has transmission lines 39 and 40 for branching one end of the hot side 36 of the unbalanced transmission line 32 into two systems, and a substantially balanced antenna such as the rod antenna 28 is electrically connected to one of the branched transmission lines 39. At the same time, the other helical antenna 29 of this nearly balanced antenna is electrically connected to the other transmission line 40 via the phase shifter 41.

Here, in the phase shifter 41, for example, FIG.
As shown in FIG. 2, two inductive reactance elements L1 and L2 are connected in series, one end of the capacitive reactance element C1 is conductively connected to a connection midpoint P1, and the other end of the capacitive reactance element C1 is shielded. It is configured by combining a plurality of T-type phase circuits 42 having a symmetric structure grounded to a case.

In the phase shifter 41, a high-frequency signal supplied from the transmitting / receiving circuit 31 via the hot side 36 of the unbalanced transmission line 32 is transmitted to the rod antenna 28 via one transmission line 39, and the other is transmitted to the rod antenna 28 via the transmission line 39. In the phase shifter 41 of the transmission line 40, this high-frequency signal is transmitted to the helical antenna 29 with a phase shift of about 180 degrees in the operating frequency band as a balance-unbalance conversion action.

As a result, in the balun 38, the rod antenna 28 and the helical antenna 29 are set to have a voltage form similar to that shown in FIGS. The antenna operates as an antenna, thereby maintaining the current balance between the rod antenna 28 and the helical antenna 29, and preventing the leakage current i2 from flowing from the helical antenna 29 to the ground side 37 of the unbalanced transmission line 32.

According to the balun 38, the phase shifter 41 is connected to the inductive reactance element L1,
As L2 and the capacitive reactance element C, for example, 1 [m
m] Since it is possible to use a chip having a fine shape of about a square, it can be formed very small as a whole.

Therefore, in the portable telephone 26 (FIG. 7) according to the present invention, the transmission / reception circuit 31
2 and the balun 38 in order to feed the rod antenna 28 and the helical antenna 29 to the rod antenna 2
8 and the helical antenna 29 are operated as substantially balanced antennas, and at this time, the leakage current i2 is prevented from flowing from the helical antenna 29 to the ground side 37 of the unbalanced transmission line 32 due to the balance / unbalance conversion action of the balun 38. Therefore, the shield case 33 can function only as an original ground and an electrical shielding plate without operating as an antenna.

Thus, in the portable telephone 26, the deterioration of the antenna characteristics can be reduced, and the deterioration of the communication quality can be greatly reduced. Further, in the mobile phone 26, the power absorbed by the human body, that is, SAR can be significantly reduced because the shield case 33 functions only as the original ground and the electrical shield plate.

FIG. 7 shows the balun 38 arranged outside the shield case 33 inside the housing case 27. The balun 38 is arranged both inside and outside the shield case 33. can do.

Further, in the portable telephone 26 according to the present invention, as shown in FIG. 13, the shield case 33, the rod antenna 28 and the helical antenna 29 are partially connected to each other inside the housing case 27 so as not to be capacitively coupled. The rod antenna 28
When the helical antenna 29 operates as an antenna, the shield case 33 is capacitively coupled to the rod antenna 28 and the helical antenna 29 to prevent the antenna from operating as an antenna.

In addition, in the portable telephone 26,
As shown in FIG. 14, a speaker 43, a liquid crystal display unit 44, various operation keys 45, and a microphone 46 are disposed on a front surface 27A of the housing case 27.
When the side is brought close to the user's head, the rod antenna 28 and the helical antenna 29
7 are arranged on the back 27B side.

Therefore, even if the housing case 27 is brought close to the head of the user, the rod antenna 28 and the helical antenna 29 can be kept away from the head, and thus the power radiated from the rod antenna 28 and the helical antenna 29 can be reduced. Absorption into the user's head is also greatly reduced.

In FIGS. 7 and 9 to 11,
Although the matching circuit is omitted to simplify the description, the matching circuit 47 can be provided, for example, between the unbalanced transmission line 32 and the balun 38, as shown in FIG.

As shown in FIG. 16, a balun 38 and
A matching circuit 48 may be provided between the rod antenna 28 and the helical antenna 29. However, if the matching circuit 48 is grounded at this time, the leakage current generated in the helical antenna 29 flows through the matching circuit 48 to the shield case 33 even if the balun 38 performs a balance-unbalance conversion operation. The case 33 operates as an antenna.

Therefore, such matching circuit 48 is
As shown in (A) and (B), an inductive connection connected in parallel between two transmission lines 48 and 50 for electrically connecting the balanced side of the balun 38 and the rod antenna 28 and the helical antenna 29 is provided. If the matching circuit 48 is constituted by the reactance element L3 or the capacitive reactance element C2 and is not grounded, the balun 38 can be used without any problem.
, And between the rod antenna 28 and the helical antenna 29.

(2) First Embodiment (2-1) Configuration of Mobile Phone According to First Embodiment In FIG. 18, in which parts corresponding to those in FIG. 1 shows a mobile phone according to a first embodiment, and a case 2 made of a non-conductive material such as a synthetic resin.
7 is provided with an antenna device 52.

In the antenna device 52, an arrow b substantially parallel to the longitudinal direction of the housing case 27 (hereinafter referred to as the housing longitudinal direction) is provided on the back surface 27B of the upper end 27C of the housing case 27. A first antenna portion 53 provided so as to be able to be pushed and pulled out along a pushing direction and a pulling direction opposite to the pushing direction, and an upper end 27 inside the housing case;
And a fixed second antenna unit 54 arranged near C.

FIGS. 19A and 19B show the internal structure of the mobile phone 51 except for a matching circuit and a shield case.
A rod antenna 55 made of a conductive rod-shaped wire and a first helical antenna 56 formed by spirally winding a conductive wire are provided.

This rod antenna 55 has a longitudinal direction (hereinafter referred to as a rod longitudinal direction) of the rod antenna 55 substantially parallel to the longitudinal direction of the housing, and has a projection 57A made of a conductive material at its lower end. One power supply member 57 is electrically and mechanically connected, and a connection portion 58 made of a non-conductive material is mechanically connected to the upper end.

In the first helical antenna 56, the center axis of the helix of the first helical antenna 56 substantially coincides with the extension line in the longitudinal direction of the rod, and the lower end of the first helical antenna 56 is provided with a second feeding member 59 made of a conductive material. Electrically and mechanically connected,
The second power supply member 59 is mechanically connected to the connection portion 58.

Thus, the first helical antenna 5
The rod 6 and the rod antenna 55 are mechanically connected to each other along the longitudinal direction of the housing by a connecting portion 58, and are electrically separated.

The rod antenna 55 is covered with a rod antenna cover 60, and the first helical antenna 56 is housed in a first helical antenna cover 61 formed in a cap shape so as not to directly touch a human body. It has been made like that.

In the second antenna section 54, a second helical antenna 62 formed by spirally winding a conductive wire is provided, and an upper end of the second helical antenna 62 is made of a conductive material. The third power supply member 63 is electrically and mechanically connected.

In the second antenna section 54, the central axis of the helix of the second helical antenna 62 (hereinafter referred to as the second central axis) is substantially the same as the extension of the first central axis. They are arranged to match.

As a result, in the antenna device 52,
When the first antenna section 53 is pushed and pulled out,
Pushing or pulling out the antenna section 53 along the second central axis so as to pass through the second antenna section 54,
Thus, the arrangement space for the first and second antenna portions 53 and 54 is significantly reduced, so that the housing case 27 can be prevented from being enlarged.

On the other hand, inside the housing case 27, a circuit board (not shown) on which various circuit elements such as the transmission / reception circuit 31 and the balun 38 are mounted, and a shield case covering the circuit board are housed. , Upper end 27 of housing case 27
An antenna feed terminal 64 made of a conductive material is provided inside C.

Here, the transmission / reception circuit 31 is electrically connected to the unbalanced side terminal of the balun 38 via the hot side (not shown) of the unbalanced transmission line 32 formed of, for example, a microstrip line formed on a circuit board. At the same time, the third power supply member 63 and the antenna power supply terminal 64 are electrically connected to the terminal on the balanced side of the balun 38.

In this antenna device 52,
The antenna feed terminal 64 can be electrically connected to the first helical antenna 56 or the rod antenna 55 when the first antenna unit 53 is pushed and pulled out.

In practice, in this antenna device 52,
When the first antenna unit 53 is pushed in, the first helical antenna cover 61 is pushed in the pushing direction, so that the rod antenna 55 and the connecting portion 58 are sequentially placed inside the housing case 27 along the second central axis. To be inserted through the second helical antenna 62 in sequence.

In the antenna device 52, when the first helical antenna cover 61 is brought into contact with the upper end 27C of the housing case 27 in this manner, the rod antenna 55 and the connecting portion 58 are connected to the housing case 27. The second power supply member 59 is electrically connected to the antenna power supply terminal 64 while being housed by being pushed inside.

Incidentally, the connecting portion 58 of the first antenna portion 53
Is located inside the second helical antenna 62 at this time, so that the rod antenna 55, the first helical antenna 56, and the second helical antenna 62 have their length and thickness so as not to be capacitively coupled. Has been selected.

At this time, the rod antenna 55 is located at a certain distance from the shield case so as not to be capacitively coupled to the shield case.
2 is also spaced apart from this shield case so as not to be capacitively coupled.

In the antenna device 52, when a high-frequency signal is transmitted from the transmitting / receiving circuit 31 to the balun 38 via the hot side of the unbalanced transmission line 32 in this state, the balun 38 feeds the high-frequency signal as it is to the antenna feed. The high-frequency signal is transmitted to the first helical antenna 56 via the terminal 64, and the high-frequency signal is shifted in phase by about 180 degrees with respect to the first helical antenna 56 in the operating frequency band. The signal is transmitted to the second helical antenna 62 via the third power supply member 63.

As a result, in the antenna device 52, the first and second helical antennas 56 and 62 have the same voltage configuration as that shown in FIGS. Helical antennas 56 and 62
Are operated as substantially balanced antennas.

In addition to this, in the antenna device 52, at this time, the unbalanced transmission line 32 is transmitted from the second helical antenna 62 due to the balance / unbalance conversion operation of the balun 38.
To prevent a leakage current from flowing to the ground side of the circuit.

Thus, in the antenna device 52, a leakage current flows from the ground side of the unbalanced transmission line 32 to the shield case and the shield case is prevented from operating as an antenna, and the shield case operates as an original electrical device. It can function only as a simple shielding plate and ground.

Therefore, in this antenna device 52,
Even if the housing case 27 is gripped by the user's hand or the housing case 27 is brought close to the user's head, the mobile phone 51 is not in the vicinity of the human body because the shield case is not operated as an antenna. Deterioration of antenna characteristics can be significantly reduced, and power absorbed by the human body, that is, SAR can be suppressed.

On the other hand, in the antenna device 52, when the first antenna portion 53 is pulled out, the first helical antenna cover is kept in a state where the rod antenna 55 and the connection portion 58 are housed inside the housing case 27. When the pin 61 is pinched and pulled in the pull-out direction, the rod antenna 55 can be pulled out from the upper end 27 </ b> C of the housing case 27.

In the antenna device 52, the rod antenna 55 is thus connected to the upper end 2 of the housing case 27.
7C, the first power supply member 5
The first power supply member 57 is electrically connected to the antenna power supply terminal 64 by the protrusion 57A of the seventh abutting against the antenna power supply terminal 64.

The first power supply member 57 is connected to the antenna power supply terminal 64 and the rod antenna 55 at this time, and in addition to the first antenna 53 being pulled out of the housing case 27. It also plays the role of a stopper that prevents it from being caught.

In the antenna device 52,
In this state, when a high-frequency signal is transmitted from the transmission / reception circuit 31 to the balun 38 via the hot side of the unbalanced transmission line 32, the balun 38 transmits the high-frequency signal as it is to the rod antenna 55 via the antenna feed terminal 64. At the same time, the phase of the high-frequency signal is shifted by about 180 degrees with respect to the rod antenna 55 in the used frequency band, and the obtained high-frequency signal having the shifted phase is transmitted to the second helical antenna 62 via the third feeding member 63. Send out.

Thus, in the antenna device 52, the rod antenna 55 and the second helical antenna 6
2 causes a voltage appearance similar to that of FIGS. 2A and 2B described above, and causes the rod antenna 55 and the second helical antenna 62 to operate as substantially balanced antennas.

In addition to this, in the antenna device 52, at this time, the unbalanced transmission line 32 is transmitted from the second helical antenna 62 due to the balance / unbalance conversion operation of the balun 38.
To prevent a leakage current from flowing to the ground side of the circuit.

As a result, in the antenna device 52, a leakage current flows from the ground side of the unbalanced transmission line 32 to the shield case, and the shield case is prevented from operating as an antenna, and the shield case is electrically operated. It can function only as a simple shielding plate and ground.

Therefore, in this antenna device 52,
As the shield case is not operated as an antenna, the antenna characteristics of the mobile phone 51 near the human body when the user holds the housing case 27 or approaches the user's head when the housing case 27 is brought close to the user's head. Deterioration can be greatly reduced, and power absorbed by the human body, that is, SAR can be suppressed.

As described above, in the portable telephone 51, when the first antenna section 53 is pulled out,
7 and a second helical antenna 62 inside the housing case 27, a transmission signal consisting of a high-frequency signal from the transmission / reception circuit 31 is sequentially transmitted to the unbalanced transmission line 32 and the balun 38. To the base station via the rod antenna 55 and the second helical antenna 62, and transmits the transmission signal to the base station via the rod antenna 55 and the second helical antenna 62.
The rod antenna 55 and the second
Of the high-frequency signal received by the helical antenna 62 is transmitted to the transmission / reception circuit 31 via the balun 38 and the unbalanced transmission line 32 in order.

In this portable telephone 51, the first
When the antenna unit 53 is pushed in, the rod antenna 55 is pushed into the inside of the housing case 27 to prevent the portability from being impaired. At this time, the first and second helical antennas 56 and 62 are used, and the transmission / reception circuit 31 is used. From the transmission line to the first and second helical antennas 56 and 62 via the unbalanced transmission line 32 and the balun 38 sequentially, and transmits the transmission signal via the first and second helical antennas 56 and 62. In addition to transmitting to the base station, the reception signal transmitted from the base station and received by the first and second helical antennas 56 and 62 is transmitted to the transmission / reception circuit 31 via the balun 38 and the unbalanced transmission line 32 in order.

In the portable telephone 51, the first and second antennas 53 and 54 are connected to the housing case 27.
The housing case 2
The first and second antenna sections 53 and 54 can be moved away from the user's head when the user moves the head 7 near the user's head, thereby further reducing the deterioration of the antenna characteristics of the mobile phone 51 near the human body. Can be done.

(2-2) Operation and Effect of the First Embodiment In the above configuration, the portable telephone 51 has the rod antenna 55 and the first helical antenna 56 at the upper end 27C of the housing case 27. One antenna unit 53 is provided so as to be able to be pushed and pulled out, and a second antenna unit 54 having a second helical antenna is arranged inside the housing case 27.

When the first antenna section 53 is pushed in, the first and second helical antennas 56 are sequentially transmitted from the transmission / reception circuit 31 via the unbalanced transmission line 32 and the balun 38.
And 62 are fed to operate the first and second helical antennas 56 and 62 as substantially balanced antennas. At this time, the balun 38 converts the unbalanced state into an unbalanced state from the second helical antenna 62. The leakage current is prevented from flowing on the ground side of the transmission line 32.

When the first antenna unit 53 is pulled out, power is supplied from the transmission / reception circuit 31 to the rod antenna 55 and the second helical antenna 62 via the unbalanced transmission line 32 and the balun 38 in that order. The two helical antennas 62 are operated as substantially balanced antennas, and also at this time, the second helical antenna 62
From flowing to the ground side of the unbalanced transmission line 32.

Therefore, in the portable telephone 51, it is possible to prevent the leakage current from flowing through the shield case from the ground side of the unbalanced transmission line 32, thereby preventing the shield case from operating as an antenna. Deterioration of antenna characteristics can be significantly reduced.

Further, in this portable telephone 51, the power absorbed by the human body, that is, the SAR can be suppressed even when the housing case 27 is brought close to the human body, because the shield case is not operated as an antenna in this way.

Further, in the portable telephone 51, the balun 3
As described above, a fine chip of about 1 [mm] square can be used for the inductive reactance element and the capacitive reactance element constituting 8, and the balun 38 itself can be formed small as a whole. Even if such a balun 38 is provided inside the housing case 27, it is possible to prevent the housing case 27 from being significantly increased in size.

According to the above configuration, the first antenna unit 5
3, the transmission / reception circuit 31 outputs the unbalanced transmission line 3
The first and second helical antennas 56 and 62 are fed through the second and baluns 38 in order to operate as a substantially balanced antenna. When the first antenna unit 53 is pulled out, the unbalanced transmission line is transmitted from the transmission / reception circuit 31 to the first antenna unit 53. The rod antenna 55 and the second helical antenna 62 are supplied with power sequentially through the balun 32 and the balun 38 to operate as a substantially balanced antenna. At this time, the second helical antenna 62 Prevents leakage current from flowing from the ground side of the unbalanced transmission line 32 to the ground side of the unbalanced transmission line 32, thereby preventing the leakage current from flowing from the ground side of the unbalanced transmission line 32 to the shield case and operating as an antenna. Deterioration of antenna characteristics in the vicinity of the human body can be significantly reduced, and A reduction in it is possible to realize a portable telephone which can be significantly reduced.

(3) Second Embodiment (3-1) Configuration of Cellular Phone According to Second Embodiment FIG. 19 (A) and FIG. 20A and 20B show a mobile phone 65 according to the second embodiment, except for the configuration of the first antenna unit 67 of the antenna device 66 and the arrangement position of the second antenna unit 54. The mobile phone 51 has the same configuration as the mobile phone 51 (FIGS. 19A and 19B) according to the first embodiment.

In the second antenna section 54, the second central axis of the second helical antenna is made substantially parallel to the first central axis of the first helical antenna 56, and the first antenna section 67 is pushed in. Sometimes, the second helical antenna 62 is inside the housing case 27 and the rod antenna 5
5 is arranged at a predetermined position so as not to be capacitively coupled.

Therefore, in this antenna device 66,
When the first antenna section 67 is pushed in, the rod antenna 55
Is inserted so as not to be inserted into the second helical antenna 62, and the length of the connecting portion 68 for mechanically connecting the rod antenna 55 and the first helical antenna 56 is increased by the rod antenna 55 and the first helical antenna. The connection portion 58 of the mobile phone 51 according to the above-described first embodiment (FIG. 19A and FIG. 19B) can be made shorter so that only 56 is not capacitively coupled.

Therefore, in the portable telephone 65, the first antenna unit 67 (FIG. 19A and FIG. 19B) is compared with the first antenna unit 53 (FIGS. 19A and 19B) of the portable telephone 51 according to the first embodiment. Can be shortened along the longitudinal direction of the rod.

Thus, in this portable telephone 65, the portion of the first antenna portion 67 that is pushed into the inside of the housing case 27 is shortened by the shortening of the first antenna portion 67 so that the housing case 27 Can be downsized along the longitudinal direction of the housing, and the first antenna unit 6
7 can be miniaturized along the longitudinal direction of the housing even when the mobile phone 65 is pulled out.

(3-2) Operation and Effect of Second Embodiment In the above configuration, in the portable telephone 65, the first antenna section 67 is provided at the upper end 27C of the housing case 27 so as to be able to be pushed and pulled out. At the same time, inside the housing case 27, the second antenna portion 54 is positioned near the rod antenna 55 housed inside the housing case 27 with the second central axis substantially parallel to the first central axis. It was arranged to be located at.

Therefore, in this portable telephone 65, the length of the connecting portion 68 of the first antenna portion 67 is
In addition, the first antenna section 67 can be shortened by making it short enough that only the first helical antenna 56 is not capacitively coupled. As a result, the size of the mobile phone 65 can be reduced along the longitudinal direction of the housing.

According to the above configuration, the first antenna portion 67 is provided at the upper end 27C of the housing case 27 so as to be able to be pushed and pulled out, and the second antenna portion 54 is provided inside the housing case 27. Is arranged substantially in parallel with the first central axis, whereby the first
In addition to the effects obtained by the first embodiment, the connecting portion 68 of the first antenna portion 67 can be shortened, and the first antenna portion 67 can be shortened in the longitudinal direction. The telephone 65 can be downsized along the longitudinal direction of the housing.

(4) Third Embodiment (4-1) Configuration of Cellular Phone According to Third Embodiment FIG. 20 (A) and FIG. 20 (B) are denoted by the same reference numerals. FIGS. 21A and 21B show a mobile phone 69 according to the third embodiment, and the mobile phone according to the second embodiment described above except for the position of the second antenna unit 54 of the antenna device 70. 65 (FIGS. 21A and 21B).

Here, for example, in the antenna devices 52 (FIGS. 19 (A) and (B)) and 66 (FIGS. 20 (A) and (B)) according to the above-described first and second embodiments, a rod antenna is used. 55 is disposed with the rod longitudinal direction substantially parallel to the housing longitudinal direction, and the first and second helical antennas 56 and 62 make the first and second central axes substantially parallel to the housing longitudinal direction. To be placed,
Rod antenna 55 and second helical antenna 56
And when the first and second helical antennas 56 and 62 operate as substantially balanced antennas, respectively, the antenna has a relatively high level of polarization on a plane substantially parallel to the longitudinal direction of the housing. ing.

On the other hand, in the antenna device 70 according to the third embodiment, the second helical antenna 62 has the second center axis substantially parallel to the direction orthogonal to the housing, and is located inside the housing case 27. Are located.

For this reason, in the antenna device 70, the rod antenna 55 and the second helical antenna 56, the first and the second helical antennas 56, and the first and the second helical antennas 56 are different from the antenna devices 52 and 661 antenna characteristics according to the first and second embodiments described above. In the antenna characteristics when the second helical antennas 56 and 62 each operate as a substantially balanced antenna, it is possible to improve the level of polarization on a plane substantially parallel to the direction orthogonal to the housing.

In the antenna device 70, the level of polarization of the antenna characteristic in a plane substantially parallel to the direction orthogonal to the housing is improved, and accordingly, the antenna device 70 in the direction orthogonal to the housing and the longitudinal direction of the housing is accordingly provided. The level of polarization of a plane substantially parallel to the predetermined direction therebetween can also be improved.

Therefore, even when the attitude of the mobile phone 69 changes, transmission and reception of radio waves with the base station can be performed relatively stably.

(4-2) Operation and Effect of Third Embodiment In the above configuration, in the portable telephone 69, the first antenna 67 is connected to the first central axis of the first helical antenna 56 and the rod. The longitudinal direction of the rod of the antenna 55 is made substantially parallel to the longitudinal direction of the housing, and the upper end 27C of the housing case 27 is formed.
And the second helical antenna 62 is arranged inside the housing case 27 with the second central axis substantially parallel to the orthogonal direction of the housing.

Therefore, in this portable telephone 69, the second helical antenna 62 is arranged with the second central axis substantially parallel to the direction orthogonal to the housing, and thus the portable telephone 6
In the antenna characteristic of No. 9, the level of polarization of a plane substantially parallel to the direction orthogonal to the housing can be improved, and accordingly, a plane parallel to a predetermined direction between the direction orthogonal to the housing and the longitudinal direction of the housing can be improved. The level of polarization can also be improved.

As a result, the portable telephone 69 can relatively stably transmit and receive radio waves to and from the base station even when the posture of the portable telephone 69 changes.

According to the above configuration, the first antenna section 67 is provided at the upper end 27C of the housing case 27 with the first central axis of the first helical antenna 56 and the rod longitudinal direction of the rod antenna 55 in the housing longitudinal direction. And the second antenna portion 54 is disposed inside the housing case 27 with the second central axis of the second helical antenna 62 substantially parallel to the direction orthogonal to the housing. By doing so, in addition to the effects obtained by the above-described second embodiment, it is possible to prevent the antenna characteristics from being significantly reduced even when the attitude of the mobile phone 69 changes, and thus the mobile phone Even if the posture of 69 changes, it is possible to prevent the call quality from being significantly reduced.

(5) Fourth Embodiment (5-1) Configuration of Mobile Phone According to Fourth Embodiment FIG. 22 in which parts corresponding to those in FIG.
FIG. 18 shows a mobile phone 71 according to a fourth embodiment, which is configured similarly to the mobile phone 51 (FIG. 18) according to the above-described first embodiment except for the configuration of the antenna device 72.

In this case, the antenna device 72 has a cap-like second helical antenna cover 73 projecting from the upper end 27C of the housing case 27 on the side of the back surface 27B. Cover 73
The second antenna unit 54 is arranged inside the.

A first antenna section 53 is provided on the upper end 73A of the second helical antenna cover 73 so as to be able to be pushed and pulled out.

Therefore, in the portable telephone 71, by disposing the second antenna portion 54 outside the upper end 27C of the housing case 27, the second antenna section 54 is moved from the hand or head of the user holding the housing case 27 to the second antenna portion 54. The antenna section 54 of the second embodiment can be kept away from the second antenna section 54. Thus, the deterioration of the antenna characteristics of the mobile phone 71 near the human body can be reduced as compared with the mobile phone 51 according to the above-described first embodiment.

In FIGS. 23 (A) and (B) in which parts corresponding to those in FIGS. 19 (A) and 19 (B) are given the same reference numerals, inside the second helical antenna cover 73, The second antenna unit 54 is arranged such that the second central axis of the second helical antenna 62 substantially coincides with the extension of the first central axis of the first helical antenna 56.

A balun 38 is provided inside the second helical antenna cover 73, and an antenna feed terminal 64 is provided inside the upper end 73 A of the second helical antenna cover 73. The power supply member 63 is spaced apart from the power supply member 63 so as not to be capacitively coupled.

In the balun 38, an antenna feed terminal 64 and a third feed member 63 are electrically connected to terminals on the balanced side.

In the antenna device 72, the first
When the first helical antenna cover 61 is pushed in the pushing direction when the antenna portion 53 is pushed in, the rod antenna 55 and the connecting portion 58 are sequentially placed inside the second helical antenna cover 73 in the second helical antenna. It can be sequentially pushed into the inside of the housing case 27 while being inserted through 62.

Further, in the antenna device 72, when the first helical antenna cover 61 is brought into contact with the upper end 73A of the second helical antenna cover 73 in this manner, the connecting portion 58 is connected to the second helical antenna 62. The rod antenna 55 is housed inside the housing case 27 by being positioned inside the spiral of
Is electrically connected to the antenna feed terminal 64.

As a result, in the antenna device 72,
In this state, the transmission / reception circuit 31 outputs the unbalanced transmission line 3
When the first and second helical antennas 56 and 62 are supplied with power via the second and balun 38 sequentially, the first and second helical antennas 56 and 62 are operated as substantially balanced antennas.

In this antenna device 72, at this time, the leakage current flows from the second helical antenna 62 to the ground side (not shown) of the unbalanced transmission line 32 due to the balance / unbalance conversion action of the balun 38. To prevent the shield case from operating as an antenna.

On the other hand, when the first antenna section 53 is pulled out, the first helical antenna cover 61 is pinched and pulled in the pulling-out direction while the rod antenna 55 is housed inside the housing case 27. The rod antenna 55 is connected to the second helical antenna cover 7.
3 can be pulled out from the upper end 73A.

When the rod antenna 55 is pulled out from the upper end 73A of the second helical antenna cover 73 as much as possible, the projection 57A of the first power supply member 57 is abutted against the antenna power supply terminal 64, so that One power supply member 57 and the antenna power supply terminal 64 are electrically connected.

In the antenna device 72, in this state, the rod antenna 55 and the second antenna 51 are sequentially transmitted from the transmission / reception circuit 31 via the unbalanced transmission line 32 and the balun 38.
, The rod antenna 55 and the second helical antenna 62 are operated as substantially balanced antennas.

Also, in this antenna device 72, the balun 38 also has the second
From the helical antenna 62 to the ground side of the unbalanced transmission line 32, thereby preventing the shield case from operating as an antenna.

As a result, in the portable telephone 71, the housing case 27 is downsized in accordance with the recent trend of downsizing, and the second antenna 54 is provided inside the housing case 27.
Even when it is difficult to provide the balun 38, the shield case operates as an antenna by providing the second antenna portion 54 and the balun 38 inside the second helical antenna cover 73 on the upper end 27C of the housing case 27. Thus, deterioration of antenna characteristics near the human body can be greatly reduced.

In the portable telephone 71, the second
From the upper end 73A of the helical antenna cover 73 of FIG.
When the user approaches the user's head in this state, the first antenna 53 is also relatively far away from the head together with the second antenna 54 when the user approaches the user's head in this state. Thus, it is possible to further reduce the deterioration of the antenna characteristics as compared with the mobile phone 51 (FIGS. 19A and 19B) according to the above-described first embodiment.

In this portable telephone 71, a fine chip of about 1 mm square can be used for the inductive reactance element and the capacitive reactance element constituting the balun 38, as described above. 38
Since the second helical antenna cover 73 can be formed to be small as a whole, the second helical antenna cover 73 is attached to the second helical antenna 62.
The size of the portable telephone 71 can be prevented from being significantly increased along the longitudinal direction of the housing.

(5-2) Operation and Effect of the Fourth Embodiment In the above configuration, in the portable telephone 71, the second helical antenna cover 73 is provided on the upper end 27C of the housing case 27, and 2 Helical antenna cover 7
The first antenna unit 53 is provided at the upper end 73 of the helical antenna 3 so as to be able to be pushed and pulled out, and the second antenna unit 54 and the balun 3 are provided inside the second helical antenna cover 73.
8 was provided.

Accordingly, in the portable telephone 71, the user holds the housing case 27 or holds the housing case 2 in this state.
The second antenna unit 54 can be moved away from the head to which the 7 can be brought close, and if the first antenna unit 53 is pulled out, the first antenna unit 53 can be moved away from the user's hand or head accordingly. Thus, deterioration of antenna characteristics near the human body can be further reduced.

According to the above configuration, the second helical antenna cover 73 provided on the upper end 27C of the housing case 27.
The first antenna unit 53 is provided at the upper end 73A of the helical antenna so as to be able to be pushed and pulled out, and the second antenna unit 54 and the balun 3 are provided inside the second helical antenna cover 73.
8, the housing case 27 is provided in addition to the effect obtained by the above-described first embodiment.
The first and second antenna portions 53 and 54 are kept away from the hand of the user holding the body and the head to which the housing case 27 is brought closer in this state, so that deterioration of the antenna characteristics near the human body can be further reduced. Thus, it is possible to realize a mobile phone capable of further reducing the deterioration of the call quality.

(6) Fifth Embodiment (6-1) Configuration of Mobile Phone According to Fifth Embodiment FIG. 20 (A) and FIG. 20 (B) are denoted by the same reference numerals. 24A and 24B show a mobile phone 74 according to the fifth embodiment, and the mobile phone 65 according to the second embodiment described above except for the configuration of the antenna device 75.
(FIGS. 20A and 20B).

In this antenna device 75, the second antenna unit 54 (FIGS. 20A and 20B) of the portable telephone 65 according to the second embodiment described above is used instead of FIG.
(Hereinafter, referred to as a thin linear antenna) 76 is provided.

The thin linear antenna 76 has substantially the same electrical length as the rod antenna 55 and the first helical antenna 56, and the longitudinal direction of the thin linear antenna 76 is substantially parallel to the longitudinal direction of the housing. It is attached to the inner wall of the housing case 27 so as not to be capacitively coupled to the shield case. The upper end of the thin linear antenna 76 is electrically connected to a terminal on the balanced side of the balun 38.

By the way, the transmission line 77 for electrically connecting the balanced side terminal of the balun 38 and the upper end of the thin linear antenna 76 is connected to the rod antenna 55 and the first helical when the first antenna 67 is pushed. The antenna 56 and the thin linear antenna 76 are located near the connecting portion 68 so as not to be capacitively coupled. When the first antenna portion 67 is pulled out, the first feeding member 57 at the lower end of the rod antenna 55 is connected to the connecting portion 68. They are spaced apart so as not to cause capacitive coupling.

As a result, in the portable telephone 74, the housing case 27 is downsized in accordance with the trend of downsizing in recent years. Therefore, the second antenna having the second helical antenna inside the housing case 27 is provided. Even when it is difficult to arrange the parts, the thin linear antenna 76 can be easily arranged inside the housing case 27 instead of the second helical antenna.

In addition to the thin linear antenna 76 being extremely thin, the inductive reactance element and the capacitive reactance element forming the balun 38 have the same structure as described above.
[Mm] It is possible to use a chip as small as a square, so that the balun 38 itself can be formed in a small size as a whole. A linear antenna 76 and balun 38 can be provided.

(6-2) Operation and Effect of Fifth Embodiment In the above configuration, in the portable telephone 74, the first antenna section 67 is provided at the upper end 27C of the housing case 27 so as to be able to be pushed and pulled out. In addition, the thin linear antenna 76 and the balun 38 are provided inside the housing case 27.

When the first antenna section 67 is pushed in, the power is supplied from the transmission / reception circuit 31 to the first helical antenna 56 and the thin linear antenna 76 via the unbalanced transmission line 32 and the balun 38 in this order. The helical antenna 56 and the thin linear antenna 76 are operated as a substantially balanced antenna, and at this time, the leakage current from the thin linear antenna 76 to the ground side of the unbalanced transmission line 32 due to the balance / unbalance conversion action of the balun 38. To prevent flowing.

When the first antenna section 67 is pulled out, power is supplied from the transmission / reception circuit 31 to the rod antenna 55 and the thin linear antenna 76 via the unbalanced transmission line 32 and the balun 38 in that order. The antenna 76 is operated as a substantially balanced type antenna, and at this time, the unbalanced transmission line 3
2 prevents leakage current from flowing to the ground side.

Accordingly, in the portable telephone 74, the thin linear antenna 76 and the balun 38 can be easily provided inside the existing housing case 27 without substantially changing the size of the existing housing case 27.

In this portable telephone 74, the first
The use of the thin linear antenna 76 and the balun 38 in addition to the antenna section 5 can prevent the shield case from operating as an antenna, thereby deteriorating the antenna characteristics of the mobile phone 74 near the human body. Can be greatly reduced.

According to the above configuration, the first antenna portion 67 is provided at the upper end 27C of the housing case 27 so as to be able to be pushed and pulled out, and the thin linear antenna 76 and the balun 38 are provided inside the housing case 27. With this arrangement, the thin linear antenna 76 and the balun 3 provided inside the housing case 27 are hardly changed in size.
8, the same effect as in the first embodiment can be obtained.

(7) Sixth Embodiment (7-1) Configuration of Mobile Phone According to Sixth Embodiment FIG. 24 (A) and FIG. 24 (B) are denoted by the same reference numerals. 26 (A) and (B) show a mobile phone 78 according to the sixth embodiment, and the above-described fifth embodiment except for the arrangement position of the thin linear antenna 76 in the antenna device 79.
The configuration is the same as that of the mobile phone 74 (FIGS. 24A and 24B) according to the embodiment.

In this case, the thin linear antenna 76 is set so that its longitudinal direction is substantially
One end is attached to the inner surface of the upper end 27C, and a small part of the other end that cannot be accommodated in the inner surface of the upper end 27C is bent to be connected to the inner surface of the upper end 27C. It is stuck on.

Therefore, in the portable telephone 78, most of the one end of the thin linear antenna 76 is attached to the inner surface of the upper end 27 C of the housing case 27, so that the user who holds the housing case 27 can hold the thin case antenna 27. The thin linear antenna 76 can be kept away from the hand, and when the thin linear antenna 76 operates as an antenna, deterioration of the antenna characteristics of the mobile phone 78 can be reduced.

In this portable telephone 78, the longitudinal direction of the thin linear antenna 76 is substantially parallel to the direction orthogonal to the housing, so that the antenna characteristics of the portable telephone 78 are the same as those of the third embodiment. In almost the same manner as the mobile phone 69 (FIGS. 21A and 21B), it is possible to improve the level of polarization of a plane substantially parallel to the orthogonal direction of the housing, and also to improve the orthogonal direction of the housing and the longitudinal direction of the housing. , The level of polarization of a plane substantially parallel to the predetermined direction can also be improved.

(7-2) Operation and Effect of Sixth Embodiment In the above configuration, in the portable telephone 78, the thin linear antenna 76 is connected from the inner surface of the upper end 27C of the case 27 to the case. The case 27 was arranged so as to be bent along the inner surface of the side wall 27D.

Therefore, the portable telephone 78 does not have a structure in which the second helical antenna cover 73 (FIGS. 23A and 23B) is provided as in the above-described fourth embodiment, but a thin line. With a simple configuration in which the position of the antenna 76 is merely changed, the antenna characteristics of the mobile phone 78 can be easily degraded by moving the thin linear antenna 76 away from the user's hand holding the housing case 27. Thus, it is possible to further reduce the decrease in call quality.

Also, the amount of power radiated from the thin linear antenna 76 absorbed by the human body can be reduced by the distance that the user moves the thin linear antenna 76 away.

According to the above configuration, the thin linear antenna 76 is arranged to be bent from the inner surface of the upper end 27C of the housing case 27 to the inner surface of the side wall 27D of the housing case 27 connected thereto. Thereby, in addition to the effect obtained by the above-described fifth embodiment, the antenna characteristic of the mobile phone 78 is degraded by moving the thin linear antenna 76 away from the hand of the user holding the housing case 27. Can be easily reduced, and thus a decrease in call quality can be further reduced.

(8) Seventh Embodiment (8-1) Configuration of Mobile Phone According to Seventh Embodiment FIG. 21 (A) and FIG. 21 (B) are denoted by the same reference numerals. 27A and 27B show a mobile phone 80 according to the seventh embodiment, and the mobile phone 69 according to the third embodiment described above except for the configuration of the first antenna unit 82 of the antenna device 81. (FIGS. 21A and 21B).

The first antenna section 82 has a rod antenna 55, and is provided so as to be able to be pushed into and pulled out from the upper end 27C of the housing case 27 with the rod longitudinal direction substantially parallel to the housing longitudinal direction. .

The second end of the rod antenna 55
Is electrically and mechanically connected, and an antenna knob 83 made of a non-conductive material such as a synthetic resin is mechanically connected to the second power supply member 59.
The antenna knob 83 has a predetermined thickness such that a user's finger can touch it, and is formed thicker than the second power supply member 59.

In practice, in this antenna device 81,
When the first antenna unit 82 is pushed in, the antenna knob 8
The rod antenna 55 can be pushed into the housing case 27 by pushing the one surface 83A of the third in the pushing direction.

In this antenna device 81, when the antenna knob 83 is abutted against the upper end 27C of the housing case 27, the entire rod antenna 55 is pushed into the housing case 27 and stored. The second power supply member 59 is electrically connected to the antenna power supply terminal 64.

In the antenna device 81, in this state, the rod antenna 55 and the second antenna are sequentially transmitted from the transmission / reception circuit 31 via the unbalanced transmission line 32 and the balun 38.
Is fed to the helical antenna 62, the rod antenna 55 and the second helical antenna 62 are operated as substantially balanced antennas, and at this time, the second helical antenna The leakage current is prevented from flowing from 62 to the ground side (not shown) of the unbalanced transmission line 32.

In this portable telephone 80, unlike the first to sixth embodiments, the first helical antenna is provided in the first antenna 82 when the first antenna 82 is pushed. The housing case 27
Since there is no antenna element protruding from the upper end 27C of the mobile phone 80 and only the antenna knob 83 protrudes, the size of the mobile phone 80 can be significantly reduced along the longitudinal direction of the housing.

In addition to this, in the portable telephone 80,
When the first antenna unit 82 is pushed in, the mobile phone 80
Are stored in the housing case 27, so that even if the mobile phone 80 is accidentally dropped, the antenna elements are provided in the housing case 27 (ie, the rod antenna 55 and the second helical antenna 62). The element can be prevented from being damaged.

On the other hand, in the antenna device 81, when the first antenna portion 82 is pulled out, the rod antenna 55 is pulled out from the upper end 27C of the housing case 27 by holding the antenna knob portion 83 and pulling it in the pulling-out direction. Can be withdrawn.

In the antenna device 81, the rod antenna 55 is thus connected to the upper end 2 of the housing case 27.
7C, the protrusion 56A of the first power supply member 57 abuts against the antenna power supply terminal 64, thereby electrically connecting the first power supply member 57 to the antenna power supply terminal 64.

In this state, in the antenna device 81, the rod antenna 55 and the second antenna are sequentially transmitted from the transmission / reception circuit 31 via the unbalanced transmission line 32 and the balun 38 in this state.
Is fed to the helical antenna 62, the rod antenna 55 and the second helical antenna 62 are operated as substantially balanced antennas, and at this time, the second helical antenna The leakage current is prevented from flowing from 62 to the ground side of the unbalanced transmission line 32.

When the first antenna section 82 is pulled out, the first antenna section 82 is not provided with the first helical antenna. Along with this, the size can be greatly reduced.

(8-2) Operation and Effect of Seventh Embodiment In the above configuration, in the portable telephone 80, the first antenna having only the rod antenna 55 as the antenna element at the upper end 27C of the housing case 27 is provided. When the first antenna unit 82 is pushed in, the rod antenna 55 is pushed into the housing case 27 for storage, and when the first antenna unit 82 is pulled out, the rod antenna 55 is inserted. Upper end 27 of housing case 27
Pull out from C.

In this portable telephone 80, both when the first antenna unit 82 is pushed in and when it is pulled out,
Unbalanced transmission line 32 and balun 38 from transmission / reception circuit 31
Are sequentially supplied to the rod antenna 55 and the second helical antenna 62, and the rod antenna 55 and the second
Helical antenna 62 is operated as a substantially balanced antenna, and at this time, the leakage current flows from the second helical antenna 62 to the ground side of the unbalanced transmission line 32 due to the balance / unbalance conversion action of the balun 38. To prevent.

Therefore, in this portable telephone 80, since the first helical antenna is not used for the first antenna section 82,
The mobile phone 80 can be significantly reduced in size along the longitudinal direction of the housing both when the first antenna unit 82 is pushed in and pulled out.

When the first antenna section 82 is pushed in, all the antenna elements are housed in the housing case 27 to eliminate the antenna elements protruding outside the housing case 27. The antenna element can be prevented from being damaged even if the antenna element is accidentally dropped.

According to the above configuration, the rod antenna 55 is provided at the upper end 27C of the housing case 27 so as to be able to be pushed and pulled out, and the second helical antenna 62 and the balun 38 are provided inside the housing case 27. By operating the rod antenna 55 and the second helical antenna 62 as antennas both when pushing and pulling out the rod antenna 55, in addition to the effect obtained by the third embodiment described above, This mobile phone 80 can be significantly reduced in size along the longitudinal direction of the housing.

(9) Eighth Embodiment (9-1) Configuration of Mobile Phone According to Eighth Embodiment FIG. 27 (A) and FIG. 27 (B) are denoted by the same reference numerals. 28 (A) and (B) show a mobile phone 84 according to the eighth embodiment, and the mobile phone 80 according to the seventh embodiment described above except for the configuration of the first antenna unit 86 of the antenna device 85. (The configuration is the same as in FIGS. 27A and 27B.)

The first antenna section 86 is provided so that its longitudinal direction is substantially parallel to the longitudinal direction of the casing and can be pushed into and pulled out from the upper end 27C of the casing case 27.

As shown in FIGS. 29A and 29B, the first antenna section 86 has a first antenna half 88 made of a conductive tubular member.
A projection 89A made of a conductive material is provided at the lower end of the antenna half 88 of FIG.
Are electrically and mechanically connected.

At the upper end of the first antenna half 88, a pull-out stopper 90 is provided, and the second antenna half 91 made of a conductive rod-like member is attached to the first antenna half 88.
8 is provided in the hole 88A so as to be able to be pushed and pulled out freely.

Then, a hole 88 of the first antenna half 88 is formed.
At the lower end of the second antenna half 91 located in A,
A sliding spring 92 made of a conductive material is electrically and mechanically connected.

At the upper end of the second antenna half 91,
A second power supply member 93 made of a conductive material is electrically and mechanically connected, and the second power supply member 93 is provided with an antenna knob 83.

Furthermore, the first and second antenna halves 8
8 and 91 have antenna covers 94 and 95, respectively.
Is coated.

In the first antenna section 86, when the second antenna half 91 is pushed into or pulled out of the first antenna half 88,
The slide spring 92 slides in the hole 88A of the antenna half 88 of the first half in a state where it is electrically connected to the first half.
The antenna half 88 and the second antenna 91 can be electrically connected via the sliding spring 92 to form a telescopic rod antenna.

In practice, the antenna device 85 (FIG. 28)
In (A) and (B)), the first antenna unit 86
Of the second antenna half 91 in the first direction by pushing one surface 83A of the antenna knob 83 in the pushing direction.
The first antenna unit 86 can be pushed into the inside of the housing case 27 while being housed in the hole 88A of the antenna half 88.

In the antenna device 85, when the antenna knob 83 is brought into contact with the upper end 27C of the housing case 27, the hole 88A of the first antenna half 88 is formed.
The entirety of the second antenna half 91 is housed to form a shortened rod antenna. In this state, almost the entire second antenna unit 86 is pushed into the housing case 27 and housed, The second power supply member 93 is electrically connected to the antenna power supply terminal 64.

In the antenna device 85,
In this state, the transmission / reception circuit 31 outputs the unbalanced transmission line 3
When the power is supplied to the shortened rod antenna and the second helical antenna 62 through the balun 2 and the balun 38 sequentially,
Thus, the shortened rod antenna and the second helical antenna 62 are operated as substantially balanced antennas. At this time, the unbalanced transmission line 32 from the second helical antenna 62 is converted by the balun 38 into an unbalanced conversion operation. Prevents leakage current from flowing to the ground side.

In the portable telephone 84, when the first antenna unit 86 is pushed in, the first antenna unit 86 is pressed.
By forming a shortened rod antenna,
The length of the first antenna portion 86 housed inside the housing case 27 can be significantly reduced as compared with the above-described seventh embodiment, and the user holding the housing case by that much can be reduced. The portion of the hand that covers the first antenna portion 86 can be reduced, and thus the deterioration of the antenna characteristics of the mobile phone 84 can be reduced.

In the portable telephone 84, the length of the first antenna portion 86 housed inside the housing case 27 is significantly reduced, so that the housing case 27 is The size can be significantly reduced along the direction.

On the other hand, in the antenna device 85, when pulling out the first antenna portion 86, the user pulls the antenna knob portion 83 and pulls it in the pulling-out direction.
The antenna half 91 of the first antenna half 88 with the hole 8
The first antenna portion 86 can be pulled out from the upper end 27C of the housing case 27 while being pulled out from the housing 8A.

In the antenna device 85, when the second antenna half 91 is completely pulled out from the upper end 27C of the housing case 27 in this manner, the first antenna half 8
The first antenna half 88 is fully drawn out from the hole 88A of the eighth antenna 8 to form a rod antenna that is extended, and the projection 89A of the first power supply member 89 is connected to the antenna power supply terminal 6.
4, the first power supply member 89 is electrically connected to the antenna power supply terminal 64.

In the antenna device 85, in this state, when power is supplied from the transmission / reception circuit 31 to the extended rod antenna and the second helical antenna 62 via the unbalanced transmission line 32 and the balun 38 in this order, The extended rod antenna and the second helical antenna 62 are operated as substantially balanced antennas, and at this time, the unbalanced transmission line 32
To prevent a leakage current from flowing to the ground side of the circuit.

(9-2) Operation and Effect of Eighth Embodiment In the above-described configuration, in the portable telephone 84, the first antenna section which forms a telescopic rod antenna at the upper end 27C of the housing case 27 is provided. 86 is provided so as to be able to be pushed and pulled out freely.

When the first antenna unit 86 is pushed in, the rod antenna shortened so that the second antenna half 91 is accommodated in the hole 88A of the first antenna half 88 is inserted into the housing case 27. And store it.

When the first antenna unit 86 is pulled out, the rod antenna extended so as to pull out the second antenna half 91 from the hole 88A of the first antenna half 88 is attached to the upper end of the housing case 27. Pull out from 27C.

Therefore, in the portable telephone 84, when the first antenna unit 86 is pushed in, the length of the first antenna unit 86 is made much shorter, and the hand of the user holding the housing case by that much reduces this length. The portion that covers the first antenna unit 86 can be greatly reduced, and thus the deterioration of the antenna characteristics of the mobile phone 84 near the human body can be reduced.

According to the above-described structure, the first antenna portion 86 forming the telescopic rod antenna is provided at the upper end 27C of the housing case 27 so as to be able to be pushed and pulled out. In addition to the effects obtained by the embodiment, when the user pushes the first antenna unit 86 and holds the housing case, the part of the user's hand that covers the first antenna unit 86 is greatly reduced to reduce the size of the mobile phone. Deterioration of the antenna characteristics of the telephone set 84 can be reduced, and thus a mobile telephone set that can further reduce a decrease in call quality can be realized.

(10) Other Embodiments In the first to eighth embodiments described above, a case is described in which the microstrip line 34 shown in FIG. However, the present invention is not limited to this, and includes a cylindrical outer conductor 96 (that is, a ground side) as shown in FIG. 30 and a linear center conductor 97 (that is, a hot side) inserted through the outer conductor 96. In addition, various unbalanced transmission lines such as a coaxial cable 98 formed insulated from each other can be applied.

In the first to eighth embodiments described above, a case is described in which a phase shifter 41 configured by combining a plurality of phase circuits 42 shown in FIG. 12 is used for the balun 38 shown in FIG. However, the present invention is not limited to this. As shown in FIGS. 31A to 31C, the phase shifter is configured by connecting two capacitive reactance elements C3 and C4 in series,
One end of the inductive reactance element L4 is conductively connected to the connection midpoint P2, and the inductive reactance element L4 is connected.
T-type phase circuit 99 having a symmetrical structure with the other end of the ground 4 grounded
And one end of each of the capacitive reactance elements C5 and C6 is electrically connected to one end and the other end of the inductive reactance element L5, and the other ends of the capacitive reactance elements C5 and C6 are grounded. Π-type phase circuit 100 having a symmetrical structure, and one end of inductive reactance elements L6 and L7 are electrically connected to one end and the other end of capacitive reactance element C7, respectively. If the phase of the high-frequency signal can be shifted by about 180 degrees in the working frequency band, such as a combination of a plurality of symmetric π-type phase circuits 101 in which the other ends of the reactance elements L6 and L7 are grounded. In addition, a phase shifter having various configurations can be used.

Further, in the above-described first to eighth embodiments, a case has been described in which the balun 38 shown in FIG. 11 is used. If a leakage current can be prevented from flowing to the ground side of the balanced transmission line 32, a balun having various other configurations can be used.

As a balun of this type, FIG.
A balun 103 having another configuration using an unbalanced transmission line 102 formed of a coaxial cable. A coaxial cable (hereinafter, referred to as a balun) having an electrical length of 1/2 wavelength at a used frequency is provided at one end of a hot side 104 of the unbalanced transmission line 102. The one end of the hot side 106 of the detour path 105 is electrically connected, and the other end of the ground side 108 of the detour path 105 is electrically connected to one end of the ground side 107 of the unbalanced transmission line 102. It is configured. That is, the balun 103 having such a configuration is the same as the phase shifter 41 of the balun 38 shown in FIG.
Instead, a bypass line 105 having an electrical length of 1/2 wavelength is used.

In the balun 103 having such a configuration, the first antenna element of the substantially balanced antenna is electrically connected to one end of the hot side 104 of the unbalanced transmission line 102, and the hot side 106 of the bypass line 105 is connected. The other end of the substantially balanced type antenna is electrically connected to the other end of the antenna, and a high-frequency signal transmitted to the first antenna element via the hot side 104 of the unbalanced transmission line 102 is transmitted to the bypass line 105. The phase is shifted to the second antenna element by about 180 degrees from the first antenna element via the hot side 106 and transmitted to the second antenna element, thereby leaking from the second antenna element to the ground side 108 of the unbalanced transmission line 102. This prevents current from flowing.

As this type of balun, as shown in FIG. 33, first and second inductive reactance elements L8
And L9, and the first and second capacitive reactance elements C
8 and C9 are sequentially and alternately connected in a ring shape, and the hot side of an unbalanced transmission line (not shown) is electrically connected to a midpoint P3 between the first inductive reactance element L8 and the second capacitive reactance element C9. Connected to the first capacitive reactance element C8 and the second inductive reactance element L
9 is electrically connected to the ground side of the unbalanced transmission line at a connection point P4, and not shown at a connection point P5 between the first inductive reactance element L8 and the first capacitive reactance element C8. The first antenna element of the substantially balanced antenna is electrically connected, and the second inductive reactance element L8 and the second capacitive reactance element C
8 is connected to the second point P6 of this almost balanced antenna.
There is also a so-called LC bridge balun configured by electrically connecting the above antenna elements.

In the balun 109 having such a configuration, the inductances L of the first and second inductive reactance elements L8 and L9 are set to the same value, and the capacitance C of the first and second capacitive reactance elements C7 and C8 is set. Are set to the same value, and the inductance L and the capacitance C are calculated by the following equation.

[0203]

(Equation 1)

And the following equation

[0205]

(Equation 2)

By selecting so as to satisfy
The high-frequency signal given from the hot side of the unbalanced transmission line is sent to the first antenna element from the connection midpoint P5 as it is, and this high-frequency signal is shifted by about 180 degrees with respect to the first antenna element in the used frequency band. The shifted high-frequency signal having the shifted phase is transmitted from the connection midpoint P6 to the second antenna element. Z1 represents the impedance between the hot side and the ground side of the unbalanced transmission line.
2 represents the impedance between the connection midpoints P5 and P6.
Further, f represents a used frequency.

In the balun 109 having such a configuration, since it can be formed as a fine chip of about 1 mm square like the phase shifter 41 of the balun 38 shown in FIG. Second embodiment of the present invention
23 (A) and (B), it can be easily provided even when the arrangement space is limited.

FIG. 34 shows a balun of this type.
As shown in (A) and (B), between an air-core coil 110 formed between the hot side and the ground side of an unbalanced transmission line (not shown) and the first and second antenna elements of a substantially balanced antenna. The transformer-type balun 112 facing the formed air-core coil 111 and the air-core coil 113 formed between the first antenna element of the hot side of the unbalanced transmission line and the substantially balanced antenna, and the unbalanced There is also a transformer-type balun 115 in which an air-core coil 114 formed between the ground side of the transmission line and the second antenna element of the substantially balanced antenna is opposed.

In addition, as shown in FIG. 35, this type of balun includes an air-core coil 116 formed between the hot side of an unbalanced transmission line (not shown) and the first antenna element of a substantially balanced antenna, as shown in FIG. And an air-core coil 11 formed between the ground side and ground of the unbalanced transmission line.
7 and the air-core coil 118 formed between the ground side and the second antenna element of the substantially balanced antenna, and the air-core coil 119 formed between the hot side and the ground. Transformer type balun 1
There are also 20.

Transformer balun 1 of related configuration
In 20, the impedance between the connection terminals of the first and second antenna elements is about four times (4Z3) the impedance Z3 between the hot side and the ground side of the unbalanced transmission line.

FIGS. 34A and 34B and FIG.
In the transformer type baluns 112, 115 and 120 shown in FIG.
Instead of 4, 116, 117, 118, and 119, FIG.
As shown in FIG.
2 and a pair of coils 124 and 125 formed by the conductor pattern 123 can also be used.

Then, the transformer type baluns 112 and 115
And 120 can be formed by a fine chip having a size of about 1 to 3 [mm] as a whole when the coil formed by integrating the conductor patterns is used as described above. As in the case of 33), it can be easily provided even when the arrangement space is limited.

FIG. 37A shows a balun of this type.
And (B) show an unbalanced transmission line 10 made of a coaxial cable.
2 is a balun 126 having another configuration using the cylindrical conductor 1.
27, the unbalanced transmission line 102 is inserted, one end 127A of the cylindrical conductor 127 is opened, and the other end 127A is opened.
B is a so-called Sperrtopf balun or Bazooka balun short-circuited to the ground side 107 of the unbalanced transmission line 102.

In the balun 126 having such a configuration, the first antenna element of the substantially balanced antenna is electrically connected to the hot side 104 of the unbalanced transmission line 102 on the open side (balanced side) of the cylindrical conductor 127. As well as
The second antenna element of the substantially balanced antenna is electrically connected to the ground side 107 of the unbalanced transmission line 102, and the unbalanced transmission line 102 is connected to the short-circuited side (unbalanced side) of the cylindrical conductor 127. The transmission / reception circuit 31 is electrically connected to the hot side 104 and the ground side 107 of FIG.

In the balun 126, since the cylindrical conductor 127 is selected to have an electrical length of / 4 wavelength of the operating frequency, the unbalanced transmission line 102 as a whole is viewed from the balanced side to the unbalanced side. One was short-circuited because the inner conductor became the outer conductor and the cylindrical conductor 127 became the outer conductor.
Since the transmission line can be regarded as a transmission line having an electrical length of / 4 wavelength, and the impedance becomes infinite with respect to the leakage current, it is possible to prevent the leakage current from flowing to the ground side 107 of the unbalanced transmission line 102.

FIG. 38 shows a super-top balun 128 using the unbalanced transmission line 32 composed of a microstrip line. The hot side 36 is formed in a linear shape while considering the hot side 36 as a center conductor of a coaxial cable. By forming the ground side 37 into a shape resembling the outer conductor of a coaxial cable and a cross section of a cylindrical conductor, the ground side 37 is equivalent to the super top balun 126 shown in FIGS. 37A and 37B and operates similarly.

FIG. 39 shows a balun 129 having another configuration using an unbalanced transmission line 102 formed of a coaxial cable. This type of balun includes an unbalanced transmission line 102 and a / 4 wavelength electrical balun at the operating frequency. A long conductor (hereinafter referred to as a branch conductor) 130 is arranged with the other end aligned, and one end of the branch conductor 130 is connected to the unbalanced transmission line 10.
2 and electrically connected to one end of the hot side 104,
The other end of the branch conductor 130 is connected to the unbalanced transmission line 102.
And is electrically connected to a portion opposing the ground side 107.

In the balun 129 having such a configuration, the first antenna element is electrically connected to the other end of the hot side 104 of the unbalanced transmission line 102, and the unbalanced transmission line 102
37A and FIG. 37B and a circuit equivalent to the baluns 126 and 128 shown in FIGS. 37A and 37B and FIG. Similarly to the baluns 126 and 128, the impedance at the other end of the unbalanced transmission line 102 on the ground side 107 is made infinite to prevent leakage current.

Further, in the above-described first to eighth embodiments, the case where a substantially balanced antenna is used has been described. However, the present invention is not limited to this, and it is structurally and electrically complete. It is also possible to use a symmetrically balanced antenna or an antenna having an intermediate excitation state that is completely asymmetrical structurally and electrically. By the way, when the antenna in the intermediate excitation mode is used, since the voltage modes in the first and second antenna elements are different, the above-described FIGS.
By using the baluns 126, 128, and 129 shown in (1), it is possible to prevent a leakage current from flowing from the first or second antenna element to the ground side of the unbalanced transmission line.

Further, in the above-described first to eighth embodiments, the first wire is formed by spirally winding a conductive wire.
And / or the case of using the second helical antennas 56 and / or 62 has been described, but the present invention is not limited to this, and as shown in FIGS. Hole 131 and conductor pattern 1
Alternatively, various other antenna elements may be used, such as a helical antenna 133 formed by the M. 32, an antenna element 136 having a conductor pattern 135 formed in a meandering shape on one surface 134A of the circuit board 134, and the like.

A thin linear antenna 76 shown in FIG. 25 is used in place of the second helical antenna 62, or the second helical antenna 62 and the thin linear antenna 7 shown in FIG.
As shown in FIGS. 41 (A) and (B) in place of the antenna element 6 shown in FIG.
37 or an antenna element formed of a thin plate-like member such as an antenna element 138 formed in a rectangular shape by a conductive thin plate can be used. Can be prevented.

In the first to seventh embodiments, the rod antenna 55 made of a conductive rod-shaped wire is used.
However, the present invention is not limited to this, and as shown in FIG. 42, a conductive wire is spirally and densely wound to form an electrically conductive tubular conductor. The wound coil 139 may be used as an antenna element. If the close-wound coil 139 is used as an antenna element, it is possible to prevent the first antenna portions 53, 67, and 82 from being damaged even when bent when pulled out.

Incidentally, the close-wound coil 139 is the same as the first antenna unit 86 of the eighth embodiment described above.
Of the antenna half 88 of FIG.

Further, in the fifth and sixth embodiments, the case where the thin linear antenna 76 is provided inside the housing case 27 has been described. However, the present invention is not limited to this, and the present invention is not limited to this. It may be provided outside the body case 27.

Further, in the above-described first to sixth embodiments, the case has been described where the first antenna portions 53 and 67 provided with the rod antenna 55 are used, but the present invention is not limited to this. 43 (A) and (B) in which parts corresponding to those in FIGS. 29 (A) and (B) are denoted by the same reference numerals.
Similarly, antenna portions 140 and 14 provided with telescopic rod antennas shown in FIGS. 44 (A) and (B), in which the same reference numerals are given to the corresponding portions in FIGS. 29 (A) and (B).
1 may be used. Thereby, the housing case 2
When the antenna portions 140 and 141 are pushed into the inside of the antenna 7, the portions where the antenna portions 140 and 141 are pushed can be greatly shortened, and the portion covered by the user's hand can be greatly reduced.

In practice, in FIGS. 43 (A) and (B),
In the antenna section 140, the second antenna half 91
A second power supply member 93 is provided at the upper end of the second power supply member 93 via a connection portion 142 made of a non-conductive material.
3, a lower end of a helical antenna 144 housed in a cap-shaped helical antenna cover 143 is electrically and mechanically connected.

In the antenna section 140, the second antenna half 9 is inserted into the hole 88A of the first antenna half 88.
The first antenna half 88 and the connecting portion 142 are covered with the rod antenna cover 145 in a state where the first antenna 1 is pushed in. Thus, in the antenna section 140 having such a configuration, the first and second antenna halves 88 and 91 form a telescopic rod antenna.

In FIGS. 44A and 44B, in the antenna section 141, a first feeding member 89 is electrically and mechanically connected to the lower end of the second antenna half 91, and A second power supply member 93 is provided at the upper end of one antenna half 88 via a connection portion 142 made of a non-conductive material.

[0229] In the antenna section 141 having such a configuration, a rod antenna which can be extended and contracted by the first and second antenna halves 88 and 91 is used similarly to the above-described antenna section 140 (Figs. 43A and 43B). Form.

Further, in the above-described eighth embodiment, the first antenna section 8 shown in FIGS.
However, the present invention is not limited to this, and the same reference numerals are given to the antenna portion having only the spiral helical antenna and the portions corresponding to FIGS. 29 (A) and (B). An antenna unit 146 forming a telescopic rod antenna shown in FIGS. 45A and 45B may be provided. In this case, the same effect as that of the above-described eighth embodiment can be obtained.

By the way, in FIGS. 45 (A) and (B),
In this antenna section 146, a first feeding member 89 is electrically and mechanically connected to a lower end of the second antenna half 91, and a second feeding member is connected to an upper end of the first antenna half 88. An antenna knob 83 is provided via 93. In the antenna unit 146 having such a configuration, the first antenna unit 86 (FIG. 29A)
And (B)) as well as the first and second antenna halves 88.
And 91 form a telescopic rod antenna.

In the first to eighth embodiments, the first antenna portions 53, 67, 82, and 86 are placed on the upper end 27C of the housing case 27 in a pushing direction substantially parallel to the longitudinal direction of the housing. And a case in which it is provided so as to be able to be pushed and pulled out along the reverse drawing direction. However, the present invention is not limited to this, and the same reference numerals are given to the corresponding parts in FIGS. 18 and 22. As shown in FIGS. 46 (A) to 46 (C), the first antenna units 53, 67, 82 and 86 are connected from the rear surface 27B of the upper end 27C of the housing case 27 to the lower end 2C.
It may be provided so as to be able to be pushed and pulled out along a direction inclined with respect to the longitudinal direction of the housing on the front 27A side of 7E.

Thus, the first antenna units 53, 67,
When the mobile phones are brought closer to the user's head by pulling out the first and second antenna sections 53, 67, and 82,
And 86 can be further distant from the head, and thus the deterioration of the antenna characteristics of the mobile phone near the human body can be further reduced.

In the first to eighth embodiments, as described in the principle, the matching circuit is connected to the transmitting / receiving circuit 3.
1 and the balun 38, or between the balun 38 and the rod antenna 28 and the helical antenna 29, but the present invention is not limited to this. As shown in FIG. Matching circuits 147 and 148 may be provided on both the balanced side and the unbalanced side of the balun 38.

Further, in the third and sixth to eighth embodiments described above, the second helical antenna 62 is disposed with the second central axis substantially parallel to the direction orthogonal to the housing, or a thin linear antenna. The case has been described where the antenna 76 is arranged with its longitudinal direction substantially parallel to the direction orthogonal to the housing. However, the present invention is not limited to this. The thin linear antenna 76 may be arranged to be inclined with respect to the body orthogonal direction, or the thin linear antenna 76 may be arranged with its longitudinal direction inclined with respect to the housing orthogonal direction.

Further, in the above-described first to eighth embodiments, the balun 38 performs the second unbalance operation by converting the balance.
The above description has been made on the case where the leakage current is prevented from flowing from the antenna element to the ground side of the unbalanced transmission line 32. However, the present invention is not limited to this. The connection of the two antenna elements may be switched to prevent leakage current from flowing from the first antenna element to the ground side of the unbalanced transmission line 32 due to the balance / unbalance conversion operation of the balun 38.

Further, in the first to eighth embodiments, the present invention is applied to the portable telephones 51, 65, and 6 described above.
9, 71, 74, 78, 80 and 84 have been described. However, the present invention is not limited to this, and may be applied to various other portable wireless devices such as cordless handsets. Can be widely applied.

Further, in the above-described first to eighth embodiments, the unbalanced conversion means for performing the unbalanced conversion operation between the unbalanced transmission line and the first and second antenna elements is used. The balun 38 using the phase circuit 42 shown in FIG. 12 has been described. However, the present invention is not limited to this, and other various baluns such as the various baluns described above may be used. Can be widely applied.

Further, in the above-described first to eighth embodiments, the second helical antenna cover 73 is used as a housing means for housing the second antenna element and pushing and pulling the rod antenna through the inside. However, the present invention is not limited to this case. If the second antenna element is housed and the rod antenna is pushed and pulled out through the inside, the case Various other storage means, such as a storage means integrally formed, can be widely applied.

[0240]

[0241]

As described above, according to the present invention, in the antenna device, the first push-pull and pull-out antenna devices are provided.
Antenna element, a fixed second antenna element paired with the first antenna element, an unbalanced transmission line for feeding the first and second antenna elements, and the unbalanced transmission line. , A balance-unbalance conversion means for performing a balance-unbalance conversion operation between the first antenna element and the second antenna element. The first through the balance conversion means
And the first and second antenna elements are operated as antennas by feeding power to the second antenna element, so that when the first and second antenna elements operate as antennas, the balance-unbalance conversion means is provided. Prevents the leakage current from flowing from the first or second antenna element through the unbalanced transmission line to the ground member to which the unbalanced transmission line is grounded, whereby the ground member The antenna device can be prevented from operating as an antenna, and the deterioration of the antenna characteristics near the human body can be significantly reduced. Thus, an antenna device that can significantly reduce the reduction in speech quality can be realized.

[0242] In a portable radio having an antenna device, a first antenna element provided in the antenna device so as to be able to be pushed into and pulled out of a housing case,
A fixed second antenna element paired with the first antenna element, an unbalanced transmission line for feeding power to the first and second antenna elements, the unbalanced transmission line, and the first and second antennas And a balance-unbalance conversion means for performing a balance-unbalance conversion operation between the first antenna element and the first antenna element. And the first and second antenna elements are operated as antennas by feeding power to the second antenna element, so that when the first and second antenna elements operate as antennas, the balance-unbalance conversion means is provided. Prevents the leakage current from flowing from the first or second antenna element to the ground member to which the unbalanced transmission line is grounded through the unbalanced transmission line, More ground member can significantly reduce the deterioration of antenna characteristics in the human body near to prevent to operate as an antenna, thus lowering the speech quality can be realized portable radio that can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a configuration of a balanced antenna.

FIG. 2 is a schematic voltage waveform diagram for explaining the operation of the balanced antenna.

FIG. 3 is a schematic diagram illustrating a configuration of an unbalanced antenna.

FIG. 4 is a schematic voltage waveform diagram for explaining the operation of the unbalanced antenna.

FIG. 5 is a schematic diagram illustrating a configuration of an intermediate excitation form antenna.

FIG. 6 is a schematic voltage waveform diagram for explaining an example of the operation of the intermediate excitation state antenna.

FIG. 7 is a schematic sectional view for explaining the principle of the mobile phone according to the present invention.

FIG. 8 is a schematic perspective view showing a configuration of an unbalanced transmission line composed of a microstrip line.

FIG. 9 is a schematic block diagram for explaining connection between an unbalanced transmission line, a rod antenna, and a helical antenna.

FIG. 10 is a schematic block diagram for explaining connection between an unbalanced transmission line using a balun, a rod antenna, and a helical antenna.

FIG. 11 is a block diagram illustrating a configuration of a balun.

FIG. 12 is a block diagram illustrating a configuration of a balun phase circuit.

FIG. 13 is a schematic diagram for describing the arrangement of a rod antenna, a helical antenna, and a shield case.

FIG. 14 is a schematic side view for explaining an arrangement of a rod antenna and a helical antenna with respect to a housing case.

FIG. 15 is a block diagram for explaining the arrangement of a matching circuit on the unbalanced side of the balun.

FIG. 16 is a block diagram for explaining the arrangement of a matching circuit on the balanced side of the balun;

FIG. 17 is a block diagram showing a configuration of a matching circuit arranged on the balanced side of the balun.

FIG. 18 is a schematic side view showing the first embodiment of the configuration of the mobile phone according to the present invention.

FIG. 19 is a block diagram showing an internal configuration of the mobile phone according to the first embodiment.

FIG. 20 is a block diagram showing an internal configuration of a mobile phone according to the second embodiment.

FIG. 21 is a block diagram showing an internal configuration of a mobile phone according to a third embodiment.

FIG. 22 is a schematic side view illustrating a configuration of a mobile phone according to a fourth embodiment.

FIG. 23 is a block diagram showing an internal configuration of a mobile phone according to a fourth embodiment.

FIG. 24 is a block diagram showing an internal configuration of a mobile phone according to a fifth embodiment.

FIG. 25 is a top view showing a thin linear antenna.

FIG. 26 is a block diagram showing an internal configuration of a mobile phone according to a sixth embodiment.

FIG. 27 is a block diagram showing an internal configuration of a mobile phone according to a seventh embodiment.

FIG. 28 is a block diagram showing an internal configuration of a mobile phone according to an eighth embodiment.

FIG. 29 is a cross-sectional view illustrating a configuration of a fifth antenna unit.

FIG. 30 is a schematic diagram illustrating a configuration of an unbalanced transmission line including a coaxial cable according to another embodiment.

FIG. 31 is a block diagram showing a configuration of a phase circuit according to another embodiment.

FIG. 32 is a schematic diagram illustrating a configuration of a balun according to another embodiment.

FIG. 33 is a schematic diagram illustrating a configuration of a balun according to another embodiment.

FIG. 34 is a schematic diagram showing a configuration of a balun according to another embodiment.

FIG. 35 is a schematic diagram showing a configuration of a balun according to another embodiment.

FIG. 36 is a top view showing a coil used in a transformer type balun.

FIG. 37 is a schematic cross-sectional view and a schematic diagram illustrating a configuration of a super top balun using a coaxial cable according to another embodiment.

FIG. 38 is a schematic diagram showing a configuration of a super top balun using a microstrip line according to another embodiment.

FIG. 39 is a schematic diagram showing a configuration of a balun according to another embodiment.

FIG. 40 is a schematic top view showing the configuration of an antenna element that replaces the first and second helical antennas according to another embodiment.

FIG. 41 is a schematic top view showing the configuration of a thin antenna element according to another embodiment.

FIG. 42 is a schematic diagram illustrating a configuration of an antenna element that replaces a rod antenna.

FIG. 43 is a schematic sectional view showing a configuration of an antenna unit provided with a telescopic rod antenna according to another embodiment.

FIG. 44 is a schematic cross-sectional view showing a configuration of an antenna unit provided with a telescopic rod antenna according to another embodiment.

FIG. 45 is a schematic cross-sectional view showing a configuration of an antenna unit forming a telescopic rod antenna according to another embodiment.

FIG. 46 is a schematic side view for explaining push-in and pull-out directions of an antenna unit according to another embodiment.

FIG. 47 is a block diagram for explaining an arrangement of a matching circuit according to another embodiment;

FIG. 48 is a block diagram showing a circuit configuration of a conventional mobile phone.

FIG. 49 is a schematic front view for explaining the operation of a conventional shield case as an antenna.

[Explanation of symbols]

26, 51, 65, 69, 71, 74, 78, 80, 8
4 ... mobile phone, 27 ... housing case, 28, 55 ...
... Rod antenna, 29 ... Helical antenna, 30,
52, 66, 70, 72, 75, 79, 81, 85 ...
Antenna device, 31 ... Transceiving circuit, 32, 102 ...
Unbalanced transmission line, 33 ... Shield case, 36, 10
4 ... hot side, 37, 107 ... ground side, 38,
103, 109, 112, 115, 120, 126, 1
28, 129: balun, 53, 67, 82, 86 ...
First antenna unit, 54... Second antenna unit, 56.
1st helical antenna, 62 2nd helical antenna, 73 2nd helical antenna cover, 7
6 ... thin linear antenna, 88 ... first antenna half, 91 ... second antenna half, 140, 141, 1
46 ... An antenna unit.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04B 1/18 H04B 1/18 A (72) Inventor Hiroki Ito 6-7-35 Kita Shinagawa, Shinagawa-ku, Tokyo No. Sony Corporation F term (reference) 5J046 AA02 AA04 AB06 AB07 AB12 DA03 5J047 AA02 AA04 AB06 AB07 AB12 FA09 FD01 5K062 AA00 AB01 AC01 AF05 BE00 BF08

Claims (21)

[Claims] A first antenna element provided so as to be able to be pushed and pulled out; a fixed second antenna element paired with the first antenna element; and a first and second antenna element. An unbalanced transmission line for feeding power; a balanced-unbalanced conversion means for performing a balanced-unbalanced conversion operation between the unbalanced transmission line and the first and second antenna elements; When the antenna element is pushed and pulled out, the first and second antenna elements are fed from the unbalanced transmission line to the first and second antenna elements via the balance-unbalance conversion means, and the first and second antenna elements operate as antennas. An antenna device characterized by being made to cause. 2. The first antenna element is formed by connecting a rod-shaped rod antenna and a helical first helical antenna via a connection portion made of a non-conductive material. When the element is pushed in, only the rod antenna is pushed in and the first helical antenna is electrically connected to the balance-unbalance conversion means. When the first antenna element is pulled out, the rod antenna is pulled out. 2. The antenna device according to claim 1, wherein the antenna device is electrically connected to the balun converter. 3. The rod antenna according to claim 1, wherein a conductive rod-shaped member is provided on the conductive cylindrical member so as to be able to be pushed and pulled out, and the rod-shaped member is inserted into the cylindrical member when the first antenna element is pushed in. The antenna device according to claim 2, wherein the member is pushed in and shortened. 4. The second antenna element is a helical second helical antenna, and is arranged such that the rod antenna is pushed in and pulled out along the center axis of the helix of the second helical antenna. The antenna device according to claim 2, wherein: 5. The antenna device according to claim 4, wherein said second antenna element is accommodated therein, and said rod antenna includes an accommodating means for pushing and pulling through said inside. 6. The second antenna element is a helical second helical antenna, and the second helical antenna is arranged such that the center axis of the helix is substantially parallel to the longitudinal direction of the rod antenna. The antenna device according to claim 2, wherein: 7. The antenna device according to claim 6, wherein the second antenna element is an antenna in which a conductive plate member is formed in a predetermined shape. 8. The second antenna element is a helical second helical antenna, and is arranged so that the center axis of the helix of the second helical antenna is substantially perpendicular to the longitudinal direction of the rod antenna. The antenna device according to claim 2, wherein: 9. The first antenna element is a rod-shaped rod antenna. When the first antenna element is pushed, the rod antenna is pushed and electrically connected to the balance-unbalance conversion means, 2. The antenna device according to claim 1, wherein when the first antenna element is pulled out, the rod antenna is drawn out and is electrically connected to the balun. 10. The rod antenna, wherein a conductive rod-shaped member is provided on a conductive cylindrical member so as to be capable of being pushed and pulled out, and the rod-shaped member is attached to the cylindrical member when the first antenna element is pushed in. The antenna device according to claim 9, wherein the member is pushed in and shortened. 11. A portable wireless device having an antenna device, wherein the antenna device comprises: a first antenna element provided so as to be able to be pushed and pulled out; and a fixed second antenna element paired with the first antenna element. An antenna element, an unbalanced transmission line for feeding power to the first and second antenna elements, a conversion action of balance unbalance between the unbalanced transmission line, and the first and second antenna elements. And a balance-unbalance conversion unit for applying the power to the first and second antenna elements from the unbalanced transmission line via the balance-unbalance conversion unit when the first antenna element is pushed and pulled out. A portable wireless device wherein the first and second antenna elements are operated as antennas. 12. The antenna device according to claim 1, further comprising a housing case into which the first antenna element is pushed and pulled out, wherein the first antenna element includes a rod-shaped rod antenna and a helical first helical antenna. When the first antenna element is pushed in, only the rod antenna is pushed into the housing case, and the first helical antenna is unbalanced when the first antenna element is pushed in. The rod antenna is electrically connected to the conversion means, and when the first antenna element is pulled out, the rod antenna is pulled out from the housing case and electrically connected to the balance-unbalance conversion means. Item 12. The portable wireless device according to Item 11. 13. The rod antenna, wherein a conductive rod-shaped member is provided on a conductive cylindrical member so as to be able to be pushed and pulled out, and the rod-shaped member is inserted into the cylindrical member when the first antenna element is pushed in. 13. The portable wireless device according to claim 12, wherein the member is pushed in and shortened. 14. The second antenna element is a helical second helical antenna, and is arranged such that the rod antenna is pushed in and pulled out along the center axis of the helix of the second helical antenna. The portable wireless device according to claim 12, wherein: 15. The antenna device according to claim 15, further comprising a storage means protrudingly provided in the housing case, storing the second antenna element, and pushing and pulling the rod antenna through the inside. The portable wireless device according to claim 14, wherein 16. The second antenna element is a helical second helical antenna, and is arranged so that the center axis of the helical spiral of the second helical antenna is substantially parallel to the longitudinal direction of the rod antenna. 13. The portable wireless device according to claim 12, wherein: 17. The portable wireless device according to claim 16, wherein said second antenna element is an antenna in which a conductive plate member is formed in a predetermined shape. 18. The second antenna element is a helical second helical antenna, and the center axis of the helix of the second helical antenna is arranged substantially perpendicular to the longitudinal direction of the rod antenna. 13. The portable wireless device according to claim 12, wherein: 19. The antenna device according to claim 19, further comprising a housing case into which the first antenna element is pushed and pulled out, wherein the first antenna element is a rod-shaped rod antenna, and when the first antenna element is pushed in, The rod antenna is pushed into the housing case and is electrically connected to the balance-unbalance conversion means. When the first antenna element is pulled out, the rod antenna is pulled out of the housing case and the balance antenna is pulled out. 12. The portable wireless device according to claim 11, wherein the portable wireless device is electrically connected to the unbalanced conversion unit. 20. The rod antenna, wherein a conductive rod-shaped member is provided on a conductive cylindrical member so as to be able to be pushed and pulled out, and when the first antenna element is pushed in, the rod-shaped member is attached to the cylindrical member. The portable wireless device according to claim 19, wherein the member is pushed in and shortened. 21. The portable wireless device according to claim 11, wherein said first and second antenna elements are provided on a rear side of said housing case facing a front side approaching a human body.