JPH11127010A - Antenna system and portable radio equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an antenna system in which the equipment is made small in size and light in weight. SOLUTION: An antenna conductor board 23 is provided on an outer circumferential face of a case 11, and a grounded conductor plate 25 acting as a grounded board with respect to the antenna conductor board is provided inside the case to make the case smaller compared with a conventional antenna system where the entire plane antenna is housed in the case, thereby making the size of the radio electric device small. Furthermore, the antenna conductor board 23 is provided on the outer circumferential face of the case 11 to make the thickness of the antenna conductor board 23 thin and the radio electronic equipment light by the thinned thickness. Since the grounded conductor board 25 acts as a shield member, the sneaking of undesired radio wave to a printed circuit board 24 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Table of Contents] The present invention will be described in the following order.

BACKGROUND OF THE INVENTION Prior Art (FIG. 10) Problems to be Solved by the Invention Means for Solving the Problems Embodiments of the Invention (1) First Embodiment (FIGS. 1 to 3) (2) Second Embodiment (FIG. 4) (3) Third Embodiment (FIG. 5) (4) Other Embodiments (FIGS. 6 to 9) Effects of the Invention

[0003]

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.

[0004]

2. Description of the Related Art Conventionally, in a mobile phone, when receiving,
By performing diversity reception, it is possible to avoid a decrease in the received signal level due to fading or the like, thereby performing high-quality communication. For this reason, this type of mobile phone is provided with two antennas for diversity reception. One is a transmission / reception monopole antenna which is attached to the housing of the mobile phone so as to be able to be pulled out, and the other is a built-in antenna dedicated to reception housed in the housing of the mobile phone.

Various types of built-in antennas have been proposed. In general, a planar antenna called an inverted F-type antenna is widely used. As shown in FIG. 10, the planar antenna 1 includes a ground conductor plate 2 grounded to the ground, and an antenna conductor plate 3 provided at a position facing the ground conductor plate 2. By supplying power to the conductor plate 3, the antenna operates as an antenna. This planar antenna 1
The operating band is determined by the peripheral length of the antenna conductor plate 3. If the wavelength of the received signal is λ, the peripheral length of the antenna conductor plate 3 is set to, for example, λ / 2, so that the antenna can be used as an antenna. Has been made to work.

When the planar antenna 1 having such a configuration is housed in a housing, usually, a space for housing the antenna is secured at a position outside the shield case covering the circuit board in the space inside the housing. The flat antenna 1 is accommodated in the space. This is because, when the planar antenna 1 is housed in a shield case together with a circuit board, radio waves to be received are cut off by the shield case, so that the antenna does not operate as an antenna. For this reason, the planar antenna 1 is housed inside the housing and outside the shield case as described above.

[0007]

When such a planar antenna 1 is used, as described above, the space for accommodating the planar antenna 1 is provided inside the housing and outside the shield case. Since it must be ensured, the size of the housing cannot be reduced, and as a result, there is a problem that the mobile phone itself cannot be reduced in size.

As a method for solving this, Japanese Utility Model Application Laid-Open No. 2-9594
There is a method disclosed in Japanese Patent Publication No. In this method, a front surface and a back surface of a housing of a wireless electronic device are formed of metal, and a flat antenna is constructed using the front surface and the back surface of the housing as an antenna conductor plate and a ground conductor plate. As a result, in this method, since the planar antenna is not housed in the housing,
The size of the wireless electronic device can be reduced.

However, in this method, since the antenna conductor plate and the ground conductor plate of the planar antenna are used as the front and back surfaces of the housing, the antenna conductor plate and the ground are made of metal in order to maintain the strength of the housing. There is a problem that the conductor plate must be thickened, and as a result, the weight of the entire wireless electronic device increases. Also, this method cannot shield the circuit board, and as a result,
There is also a problem that external noise and housing radiation cannot be reduced, and the operation of the wireless electronic device cannot be stabilized.

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 capable of realizing miniaturization and weight reduction of a device and a portable wireless device using the same.

[0011]

According to the present invention, there is provided an antenna conductor plate formed on an outer peripheral surface of a housing case of a wireless electronic device, and a housing facing the antenna conductor plate. A ground conductor plate provided in the case and functioning as a ground plate for the antenna conductor plate and functioning as a shield member of the circuit board housed in the housing case is provided.

In this manner, the antenna conductor plate is provided on the outer peripheral surface of the housing case, and the ground conductor plate functioning as a ground plate for the antenna conductor plate is provided in the housing case. As compared with the case where the entire planar antenna is housed in the housing case, the housing case can be downsized, and the wireless electronic device can be downsized. In addition, since the antenna conductor plate is provided on the outer peripheral surface of the housing case, the thickness of the antenna conductor plate can be reduced, and the wireless electronic device can be lightened accordingly. Further, since the ground conductor plate functions as a shield member, it is possible to prevent unnecessary radio waves from entering the circuit board.

Further, in the present invention, an antenna conductor plate formed on an outer peripheral surface of a housing case of a wireless electronic device, and an antenna conductor plate provided in the housing case so as to face the antenna conductor plate, and A grounding conductor plate that functions as a grounding plate and also functions as a shield member for a circuit board housed in the housing case, and is provided on the inner peripheral surface of the housing case so as to face the antenna conductor plate; Accordingly, a power supply electrode plate electrically connected to the antenna conductor plate and a high dielectric constant material interposed between the power supply electrode plate and the antenna conductor plate are provided.

In this manner, the antenna conductor plate is provided on the outer peripheral surface of the housing case, and the ground conductor plate functioning as a ground plate for the antenna conductor plate is provided in the housing case. As compared with the case where the entire planar antenna is housed in the housing case, the housing case can be downsized, and the wireless electronic device can be downsized. In addition, since the antenna conductor plate is provided on the outer peripheral surface of the housing case, the thickness of the antenna conductor plate can be reduced, and the wireless electronic device can be lightened accordingly. Further, a power supply electrode plate connected to the antenna conductor plate by capacitive coupling is provided on the inner peripheral surface of the housing case, and power is supplied via the power supply electrode plate, so that power can be easily supplied. Can be. Further, by providing a high dielectric constant material between the power supply electrode plate and the antenna conductor plate, the degree of capacitive coupling between the power supply electrode plate and the antenna conductor plate can be improved, and the power supply electrode is correspondingly increased. The size of the plate can be reduced.

[0015]

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

(1) First Embodiment In FIG. 1, reference numeral 10 denotes a cellular phone to which the present invention is applied as a whole, and is constituted by a casing 11 made of a non-conductive material such as a synthetic resin. 10 of the main body. A monopole antenna 12 is provided on the upper surface of the housing case 11 so as to be drawn out and stored in the housing case 11 by sliding in the direction of the arrow a or b. The transmission signal is transmitted to the base station via the monopole antenna 12, and the transmission signal from the base station is received.

A speaker 13A is provided on the upper front of the housing case 11. In this portable telephone 10,
The voice of the other party is output via the speaker 13A. A display unit 14 made of, for example, a liquid crystal display is provided below the speaker 13A. In this mobile phone 10, a telephone number or a telephone directory input through a numeric key 15 described later is displayed on the display unit 14. Various information such as the name of the other party registered as a telephone number and the corresponding telephone number, or the electric field strength and the remaining battery level are displayed.

Further, a call key 16, a function key 17, a call end key 1
8, operation keys including a numeric key 15, an asterisk key 19, and a shear key 20 are provided, and various information can be input through these operation keys.

Specifically, when the call key 16 is pressed,
Command information indicating an outgoing call can be input, and when the call end key 18 is pressed, command information indicating an end of the call can be input. When the function key 17 is pressed in combination with the desired numeric key 15, call information of various functions prepared in the mobile phone 10 can be input. The number keys 15 are "0" to "9".
Up to ten keys, and corresponding number information can be input. Therefore, when the numeric key 15 is depressed, it is possible to input the telephone number of the other party to start calling. Also asterisk key 1
When the user presses the "9" and the "Sheep" key 20, "*" and "@" can be inputted respectively.

Further, at the lower position of these operation keys,
A microphone 13B is provided, and the mobile phone 10 collects a voice uttered by the user by the microphone 13B. Thus, the mobile phone 10 can transmit a voice signal obtained through the microphone 13B to the other party to talk with the other party.

On the other hand, a rotary operator 21 called a jog dial is provided on the left side of the housing case 11. When the rotary operator 21 is rotated in the direction of arrow c, it is displayed on the display unit 14. The cursor can be moved up and down, so that a desired item can be selected from the items displayed on the display unit 14. The rotary operation element 21 can be pressed down toward the inside of the housing (that is, the direction of arrow d), so that selection confirmation information, call information, and the like can be input. ing.

On the other hand, as shown in FIG. 2, a battery pack 22 is mounted on the back surface of the housing case 11. In this portable telephone 10, the secondary battery stored in the battery pack 22 is provided. A driving power supply is obtained from the power supply.

At a position above the battery pack 22,
An antenna conductor plate 23 constituting a planar antenna is provided, and a transmission signal from a base station can be received through the antenna conductor plate 23. As a result, in the mobile phone 10, diversity reception is performed by adaptively selecting the received signals received by the monopole antenna 12 and the antenna conductor plate 23 constituting the planar antenna described above. It has been done.

Here, the planar antenna provided on the mobile phone 10 will be specifically described with reference to FIG. First, a circuit board 24 on which a transmission / reception circuit for wireless communication with a base station, a control circuit for controlling the liquid crystal display, and the like are mounted is housed inside the housing case 11. The mobile phone 10
The operation of each circuit on the circuit board 24 operates as a wireless electronic device. The circuit board 24 is covered by a metal shield case 25 that is grounded to the ground of the circuit board 24, so that external noise radio waves and radio waves radiated from the monopole antenna 12 can be transmitted to the circuit board 24. The circuit 24 can be prevented from sneaking into each circuit. The shield case 25 is provided at a position facing the above-described antenna conductor plate 23. In the mobile phone 10, the shield case 25 also functions as a ground plate for the antenna conductor plate 23.

On the other hand, the surface of the antenna conductor plate 23 provided on the outer peripheral surface of the housing case 11 is covered with a thin insulating film 26 of, for example, synthetic resin or the like. The antenna conductor plate 23 can be prevented from directly touching a human body when it is picked up, and the antenna characteristics can be prevented from being extremely deteriorated due to the influence of the human body.

In the case of the mobile phone 10, the antenna conductor plate 23 is formed by attaching a thin metal plate to the outer peripheral surface of the housing case 11 or applying a metal plating to the outer peripheral surface of the housing case 11. Therefore, the thickness of the antenna conductor plate 23 is extremely small. The reason why the thickness of the antenna conductor plate 23 can be reduced in this way is that, in the case of the mobile phone 10, the housing case is not formed by the antenna conductor plate as in the related art, but the antenna conductor plate is used. Because the housing case 11 is provided separately from the housing 23, sufficient strength required for the housing can be secured.

By the way, in the case of the mobile phone 10,
The shield case 25 and the housing case 11 described above are provided with through-holes 27 and 28, respectively. The through-holes 27 and 28 are passed through a coaxial cable 29 whose cable outer periphery is covered. 23. As a result, in the mobile phone 10, the feeding point P on the circuit board 24 and the antenna conductor plate 23 are directly electrically connected via the coaxial cable 29 to supply power to the antenna conductor plate 23. I have. Therefore, in this mobile phone 10,
A reception signal received by the antenna conductor plate 23 can be guided to a transmission / reception circuit on the circuit board 24 via the coaxial cable 29 and the feeding point P.

In the above configuration, the portable telephone 10
In the case of (1), the antenna conductor plate 23 is formed on the outer peripheral surface of the housing case 11, and the shield case 25 of the circuit board 24 is disposed at a position facing the antenna conductor plate 23.
As a result, in the case of the mobile phone 10, the shield case 25 is used as a ground conductor plate, and a flat antenna is formed by the ground conductor plate and the antenna conductor plate 23, and the antenna is received by the antenna conductor plate 23. The reception signal is led to a transmission / reception circuit. As a result, the mobile phone 10 adaptively selects a reception signal having a better reception state from a reception signal received by the planar antenna and a reception signal received by the monopole antenna 12 to perform diversity reception. , High quality communication can be performed.

In the case of the mobile phone 10, the antenna conductor plate 23 is disposed on the outer peripheral surface of the housing case 11, and the antenna conductor plate 23 and the shield case 25 of the circuit board 24 form a planar antenna. By doing so, it is not necessary to secure a space for accommodating the planar antenna in the housing case as in the conventional case, the size of the housing case can be reduced accordingly, and the size of the mobile phone itself can be reduced. It can also be miniaturized. Further, in this mobile phone 10, since the planar antenna is not arranged in the housing case 11,
In particular, a planar antenna having a large area can be formed without being limited by the installation space of the planar antenna.

Further, in the case of the portable telephone 10, since the housing case 11 can provide sufficient strength as a housing by providing the housing case 11, the front and back surfaces of the housing case are constituted by conductive plates. The thickness of the antenna conductor plate 23 can be reduced as compared with the conventional method, and the weight of the mobile phone 10 can be reduced accordingly. In this case, since the antenna conductor plate and the shield case 25 are also used, there is no need to provide a separate ground conductor plate, and the weight of the mobile phone 10 can be reduced accordingly. Further, in this case, since the shield case 25 is provided, the shield case 25 can prevent a radio wave or the like of an external noise from flowing to each circuit on the circuit board 24, thereby preventing a malfunction of the mobile phone. It can be prevented from occurring and can be operated stably.

Further, in the case of the mobile phone 10, the shield case 25 serving as a ground conductor plate and the antenna conductor plate 2
3, a circuit board is interposed between the conductor plates as in the conventional method in which the front and back surfaces of the case are used as an antenna conductor plate and a ground conductor plate. Compared with the case where the antenna is inserted, the dielectric constant between the conductor plates can be stabilized, and the operation of the planar antenna can be stabilized.

According to the above configuration, the antenna conductor plate 23
Is provided on the outer peripheral surface of the housing case 11, and a shield case 25 is provided at a position in the housing case 11 opposed to the antenna conductor plate 23, and the shield case 25 is used as a ground conductor plate along with the antenna conductor plate 23. By forming the antenna, the size of the mobile phone 10 can be reduced and the weight can be reduced as compared with the case where the entire flat antenna is housed in the housing case as in the related art, and thus the weight can be reduced. A small and lightweight mobile phone 10 can be realized.

(2) Second Embodiment FIG. 4, in which parts corresponding to those in FIG. 3 are assigned the same reference numerals, shows the structure of a planar antenna according to the second embodiment. As shown in FIG. 4, in the second embodiment, a conductor plate 30 is provided on the inner peripheral surface of the housing case 11 so as to face the antenna conductor plate 23. The conductor plate 30 is formed by attaching a thin metal plate on the inner peripheral surface of the housing case 11 or by applying a metal plating to the inner peripheral surface of the housing case 11. As a very thin thing.

The conductor plate 30 is grounded to the ground via a predetermined connection means. In the second embodiment, the conductor plate 30 functions as a ground conductor plate for the antenna conductor plate 23. In addition, it also functions as a shield member for the circuit board 24. Thus, also in the second embodiment, a planar antenna can be formed by the conductor plate 30 and the antenna conductor plate 23, and unnecessary electric waves are transmitted to each circuit on the circuit board 24 by the conductor plate 30. It can prevent sneaking around.

Also in the second embodiment, the casing case 11 and the conductor plate 30 are provided with through holes 28 and 31, respectively, so that the coaxial cable 29 can be passed through the through holes 28 and 31. Thus, the power is supplied to the antenna conductor plate 23 by electrically directly connecting the feeding point P on the circuit board 24 and the antenna conductor plate 23. Thus, also in the second embodiment, the reception signal received by the antenna conductor plate 23 can be guided to the transmission / reception circuit on the circuit board 24 via the coaxial cable 29 and the feeding point P.

In the second embodiment, in the second embodiment, the conductor plate 30 is provided on the inner peripheral surface of the housing case 11, and the conductor plate 30 is grounded to function as a ground conductor plate. The conductor plate 30 and the antenna conductor plate 23
Thus, a planar antenna is formed. Thereby, also in the case of the second embodiment, diversity reception can be performed by guiding the reception signal received by the antenna conductor plate 23 to the transmission / reception circuit.

In the second embodiment, the grounding conductor plate and the conductor plate 30 serving as a shield member are connected to the housing case 11.
Is provided on the inner peripheral surface of the conductor plate 30.
As a result, the thickness can be reduced, and as a result, the thickness of the conductor can be reduced as compared with the shield case 25 in the first embodiment to further reduce the weight of the mobile phone itself. Can be.

Further, in the second embodiment, the conductor plate 30 serving as the ground conductor plate and the shield member is connected to the casing case 1.
1, the space between the shield case 25 and the housing case 11 cannot be formed as in the first embodiment. Therefore, the size of the housing case 11 is further reduced accordingly. The size can be reduced, and the size of the mobile phone itself can be further reduced.

According to the above configuration, since the grounding conductor plate and the conductor plate 30 serving as a shield member are provided on the inner peripheral surface of the housing case 11, the size of the portable telephone can be further reduced, and In addition, the weight of the mobile phone can be further reduced.

(3) Third Embodiment FIG. 5, in which parts corresponding to those in FIG. 3 are assigned the same reference numerals, shows the structure of a planar antenna according to the third embodiment. As shown in FIG. 5, in the third embodiment, a power supply electrode plate 35 is provided on the inner peripheral surface of the housing case 11 at a position facing the antenna conductor plate 23. The power supply electrode plate 35 is formed by attaching a thin metal plate on the inner peripheral surface of the housing case 11 or applying a metal plating to the inner peripheral surface of the housing case 11.
The thickness of the power supply electrode plate 35 is very thin.

The power supply electrode plate 35 is formed of the antenna conductor plate 2.
3, a capacitor is formed, so that the power supply electrode plate 35 is connected to the antenna conductor plate 23 by capacitive coupling.
Are electrically connected to A power supply point P on the circuit board 24 is electrically connected to the power supply electrode plate 35 via a coaxial cable 29, whereby power is supplied to the power supply electrode plate 35.

In the above configuration, in the case of the third embodiment, when a reception signal is received by the antenna conductor plate 23, an excitation signal corresponding to the reception signal is supplied by capacitive coupling. Occurs on the electrode plate 35 for use. Since the power supply electrode plate 35 is connected to the power supply point P via the coaxial cable 29, the excitation signal is guided to the transmission / reception circuit via the power supply point P. That is, in the third embodiment, a reception signal received by the antenna conductor plate 23 is guided to the power supply electrode plate 35 by capacitive coupling, and then transmitted and received through the coaxial cable 29 and the power supply point P. Lead to. Thus, diversity reception can be performed using the reception signal received by the antenna conductor plate 23.

In the third embodiment, the power supply electrode plate 35 is provided on the inner peripheral surface of the housing case 11 at a position facing the antenna conductor plate 23, and the antenna conductor plate 23 is provided.
By supplying power to the antenna conductor plate 23 by capacitive coupling between the power supply electrode plate 35 and the power supply electrode plate 35, it is not necessary to provide the through-hole 28 in the housing case 11 as in the first embodiment. For this reason, when manufacturing a mobile phone, the process of forming a through hole 28
The number of steps for aligning the through holes 27 with the holes can be reduced, and accordingly, the time and labor required for manufacturing can be reduced, and the manufacturing cost can be reduced.

According to the above configuration, the power supply electrode plate 35 is provided on the inner peripheral surface of the housing case 11 and the antenna conductor plate 23 is provided.
By supplying power to the antenna conductor plate 23 by capacitive coupling between the antenna conductor plate 23 and the power supply electrode plate 35, it is possible to reduce the time and effort required for manufacturing.

(4) Other Embodiments In the above-described third embodiment, the case 1
1, the power supply electrode plate 35 is simply provided on the inner peripheral surface. However, the present invention is not limited to this, and as shown in FIG. A portion sandwiched between the antenna conductor plate 23 and the antenna conductor plate 23 may be formed of a material 40 having a high relative dielectric constant (that is, a high dielectric constant material) 40. When the high dielectric constant material 40 is inserted between the antenna conductor plate 23 and the power supply electrode plate 35 in this manner, the degree of capacitive coupling between the antenna conductor plate 23 and the power supply electrode plate 35 can be improved. Accordingly, the size of the power supply electrode plate 35 can be further reduced. Therefore, the weight of the mobile phone can be further reduced.

In the third embodiment described above,
Although the case in which the power supply electrode plate 35 is simply provided on the inner peripheral surface of the housing case 11 has been described, the present invention is not limited to this. As shown in FIG. An antenna conductor plate 42 having a convex cross section may be fitted to that portion. If a part of the housing case 11 is thinned in this way and the antenna conductor plate 42 is provided in that part, the distance between the antenna conductor plate 42 and the power supply electrode plate 35 becomes shorter, so that the antenna conductor plate It is possible to improve the degree of capacitive coupling between 42 and the power supply electrode plate 35. Therefore, also in this case, the size of the power supply electrode plate 35 can be further reduced by the improvement in the degree of capacitive coupling, and the weight of the mobile phone can be further reduced.

In the above-described first embodiment,
Although a case has been described in which through holes 27 and 28 are provided in the shield case 25 and the housing case 11, respectively, and power is supplied to the through holes 27 and 28 through the coaxial cable 29, the present invention is not limited to this. As shown in
Through holes are formed by applying metal plating 45 to the inner peripheral surface of the through hole 28 and the vicinity of the opening of the through hole 28 in the inner peripheral surface of the housing case 11, respectively, and are coaxial with the electrode 45A of the through hole. The cable 29 may be connected. By forming a through hole in this way and forming an electrode 45A to be electrically connected to the antenna conductor plate 23 on the inner peripheral surface of the housing case 11, the coaxial cable 29 is connected to the electrode 45A. The connection of the coaxial cable 29 can be easily performed as compared with the case where the coaxial cable 29 is directly connected to the antenna conductor plate 23.

In the first embodiment described above,
Although the case where the antenna conductor plate 23 is simply provided on the outer peripheral surface of the housing case 11 has been described, the present invention is not limited to this.
As shown in FIG. 9, a recess 50 corresponding to the size and thickness of the antenna conductor plate 23 may be provided on the outer peripheral surface of the housing case 11, and the antenna conductor plate 23 may be embedded in the recess 50. By embedding the antenna conductor plate 23 on the outer peripheral surface of the housing case 11 in this manner, the first
As in the embodiment, the step due to the antenna conductor plate 23 does not occur, and it is possible to make the mobile phone easy to grip by eliminating the uncomfortable feeling when holding the mobile phone.

In the first embodiment described above,
Although the case where power is supplied to the antenna conductor plate 23 using the coaxial cable 29 has been described, the present invention is not limited to this, and the power supply point and the antenna conductor plate are May be electrically connected to supply power.

In the above-described embodiment, the case where the present invention is applied to the mobile phone 10 has been described. However, the present invention is not limited to this. For example, the present invention may be applied to a cordless telephone handset or the like. Good and can be widely applied to portable radios.

[0051]

As described above, according to the present invention, the antenna conductor plate is provided on the outer peripheral surface of the housing case, and the ground conductor plate which functions as a ground plate for the antenna conductor plate and a shield member of the circuit board is provided. By providing the antenna inside the body case, it is possible to reduce the size and weight of the housing case as compared with the case where the entire planar antenna is housed in the housing case as before, and thus to reduce the size and weight of the wireless electronic device. Can be

In addition, an antenna conductor plate is provided on the outer peripheral surface of the housing case, and a ground plate for the antenna conductor plate and a ground conductor plate functioning as a shield member of the circuit board are provided in the housing case. A power supply electrode plate connected by capacitive coupling is provided on the inner peripheral surface of the housing case,
By inserting a high dielectric constant material between the power supply electrode plate and the antenna conductor plate, the power supply electrode plate can be reduced in size, and the wireless electronic device can be further reduced in size and weight.

[Brief description of the drawings]

FIG. 1 is a front external view showing a configuration of a mobile phone to which the present invention is applied.

FIG. 2 is a rear external view showing a rear configuration of the mobile phone.

FIG. 3 is a cross-sectional view for describing a planar antenna.

FIG. 4 is a cross-sectional view for describing a planar antenna according to a second embodiment.

FIG. 5 is a sectional view for explaining a planar antenna according to a third embodiment;

FIG. 6 is a cross-sectional view for describing a planar antenna according to another embodiment.

FIG. 7 is a cross-sectional view for describing a planar antenna according to another embodiment.

FIG. 8 is a cross-sectional view for describing a planar antenna according to another embodiment.

FIG. 9 is a cross-sectional view for explaining a planar antenna according to another embodiment.

FIG. 10 is a schematic diagram for describing an inverted-F antenna.

[Explanation of symbols]

1 ... planar antenna, 2 ... ground conductor plate, 3, 23, 4
2 ... antenna conductor plate, 10 ... mobile phone, 11 ...
Casing case, 12 Monopole antenna, 13A
Speaker 13B microphone 14 display unit
15 Numeric key, 16 Call key, 17 Function key, 18 Call end key, 19 Asterisk key, 20 Sharp key, 21 Rotary control, 22 Battery pack, 24 ... circuit board, 25 ...
Shield case, 26 ... insulating film, 27, 28, 31 ...
... through-hole, 29 ... coaxial cable, 30 ... conductor plate, 3
5 ... power supply electrode plate, 40 ... high dielectric constant material, 41, 5
0: recess, 45: metal plating, 45A: electrode.

Claims (14)

[Claims] An antenna conductor plate formed on an outer peripheral surface of a housing case of a wireless electronic device; and an antenna conductor plate provided in the housing case so as to face the antenna conductor plate and contacting the antenna conductor plate. An antenna device comprising: a ground conductor plate that functions as a ground plate and also functions as a shield member for a circuit board housed in the housing case. 2. The antenna device according to claim 1, wherein the ground conductor plate is formed on an inner peripheral surface of the housing case. 3. The antenna device according to claim 1, wherein power is supplied to the antenna conductor plate by electrically directly connecting the antenna conductor plate and a feeding point on the circuit board. 4. An electrode plate is formed on the inner peripheral surface of the housing case so as to face the antenna conductor plate, and the electrode plate is electrically connected to a feed point on the circuit board. The antenna device according to claim 1, wherein power is supplied to the antenna conductor plate by capacitive coupling between the electrode plate and the antenna conductor plate. 5. The antenna device according to claim 1, wherein the thickness of a part of the housing case is reduced, and the antenna conductor plate is provided in the part. 6. The antenna device according to claim 1, further comprising an insulator covering a surface of the antenna conductor plate. 7. An antenna conductor plate formed on an outer peripheral surface of a housing case of a wireless electronic device, provided in said housing case so as to face said antenna conductor plate, and being in contact with said antenna conductor plate. A ground conductor plate that functions as a ground plate and also functions as a shield member for a circuit board housed in the housing case, and is provided on the inner peripheral surface of the housing case so as to face the antenna conductor plate, A power supply electrode plate electrically connected to the antenna conductor plate by capacitive coupling, and a high dielectric constant material interposed between the power supply electrode plate and the antenna conductor plate. Antenna device. 8. A portable wireless device having a monopole antenna and a planar antenna, wherein diversity reception is performed by the monopole antenna and the planar antenna, wherein the planar antenna is an outer peripheral surface of a housing case. An antenna conductor plate formed thereon, provided in the housing case so as to face the antenna conductor plate, and functioning as a ground plate for the antenna conductor plate, and housed in the housing case. A portable wireless device comprising a ground conductor plate functioning as a shield member of a circuit board. 9. The portable wireless device according to claim 8, wherein the ground conductor plate is formed on an inner peripheral surface of the housing case. 10. The portable wireless device according to claim 8, wherein power is supplied to said antenna conductor plate by electrically directly connecting said antenna conductor plate and a feed point on said circuit board. 11. An electrode plate is formed on the inner peripheral surface of the housing case so as to face the antenna conductor plate, and the electrode plate is electrically connected to a feed point on the circuit board. 9. The portable wireless device according to claim 8, wherein power is supplied to the antenna conductor plate by capacitive coupling between the electrode plate and the antenna conductor plate. 12. The portable wireless device according to claim 8, wherein a part of said housing case is reduced in thickness and said antenna conductor plate is provided in said part. 13. The portable wireless device according to claim 8, further comprising an insulator covering a surface of said antenna conductor plate. 14. A portable wireless device having a monopole antenna and a planar antenna, wherein diversity reception is performed by the monopole antenna and the planar antenna, wherein the planar antenna has an outer peripheral surface of a housing case. An antenna conductor plate formed thereon, provided in the housing case so as to face the antenna conductor plate, and functioning as a ground plate for the antenna conductor plate, and housed in the housing case. A ground conductor plate that functions as a shield member of the circuit board; and is provided on the inner peripheral surface of the housing case so as to face the antenna conductor plate, and is electrically connected to the antenna conductor plate by capacitive coupling. And a high-permittivity material interposed between the power supply electrode plate and the antenna conductor plate. Machine.