JP2002135045A - Composite antenna device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite antenna device which receives two types of radio waves different in uses and whose whole height is low by combining a patch antenna and a slot antenna. SOLUTION: The slot antenna for mobile object is provided with a cylindrical body 10 which has a straight axis whose length in the axial direction is below λ/4 where λ is the wavelength of an electromagnetic wave to be transmitted or received, and is formed of a conductive material. A notch 11 having the length of λ/2 is formed in the circumferential direction of the cylindrical body 10. End plates 16 and 17 which have diameters larger than the cylindrical body 10 and are formed of the conductive materials are fixed at the end parts of the cylindrical body 10. In the composite antenna device, the patch antenna 25 operating the end plate 16 or 17 as ground is incorporated into slot antenna. When the patch antenna 25 is arranged in a recessed part obtained by hollowing the end plate 16 of the slot antenna 5, antenna directivity and a main beam axis can be changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite antenna device, and more particularly, to a composite antenna device used by being installed on a roof of a railway vehicle, a bus, an automobile, or the like.

[0002]

2. Description of the Related Art Conventionally, monopole antennas have been generally used for mobile communication systems. However, this monopole antenna required a physical length of １ ／ or more of the wavelength λ of the transmitted / received electromagnetic wave. Therefore, the monopole antenna is large in size as a mobile antenna installed and used on the roof of a high-speed mobile body such as a railway car, a bus, and an automobile, is a short, low-profile type, and is omnidirectional in a horizontal plane. In some cases, it cannot be used for a mobile antenna that is desirable.

On the other hand, a slot antenna in which an elongated slot is formed in a wide conductor plate to radiate an electromagnetic wave having the same directivity as a dipole antenna is known, but this is also large in size and is difficult to use as a mobile antenna. .
Therefore, the present applicant has already proposed a cylindrical slot antenna (hereinafter, referred to as a cylindrical slot antenna) in which a conductor plate is formed in a cylindrical shape and has a low profile (hereinafter referred to as a cylindrical slot antenna) (see Japanese Patent Application Laid-Open No. 5-136627). ).

[0004] In recent years, services such as mobile phones, GPS (global positioning system), VICS (road traffic information communication system), and data communication have been diversified, and antennas are required for each application. A horizontal omnidirectional mobile antenna such as a monopole antenna or a slot antenna is intended to receive a terrestrial wave such as a re-radiated wave (gap filler wave) of satellite digital broadcasting, and is used for GPS. Cannot receive electromagnetic waves. Therefore, with the spread of car navigation systems, GPS antennas called patch antennas are being mounted on moving objects. Therefore, in recent years, a plurality of antennas, for example, a cylindrical slot antenna for receiving a gap filler wave and a patch antenna may be provided in a moving body.

[0005]

However, when a plurality of antennas are installed on a moving body, they are often arranged side by side on the same plane. In such a case, a large installation space is required and a large space is required. There is a problem that the directivity is disturbed by the influence of the above, and the directivity is disturbed by installing another antenna with a non-directional antenna in a horizontal plane.

Therefore, according to the present invention, since the cylindrical slot antenna is a planar antenna and the end plate at the top of the antenna is grounded, an antenna capable of sharing the grounded state is provided in addition to the cylindrical slot antenna. Focusing on what can be done, by combining the conventional patch antenna with the mobile antenna proposed by the applicant, the overall height can be reduced, and the directivity of the antenna is affected. It is an object of the present invention to provide a composite antenna device that does not give the following.

[0007]

According to a first aspect of the present invention, there is provided a composite antenna device having a linear axis, the length of which in the axial direction is determined by the length of an electromagnetic wave to be transmitted or received. When the wavelength is λ, a cylindrical body made of a conductive material having a wavelength of less than λ / 4 is provided, and a notch having a length of λ / 2 is formed in the circumferential direction of the cylindrical body. To
In a mobile antenna in which end plates made of a conductive material having a diameter larger than a cylindrical body are fixed, a ground plane portion forming a patch antenna is integrated with one of the two end plates. The patch antenna is characterized in that the patch antenna is incorporated in the mobile object antenna in a shared state.

A composite antenna device according to a second aspect of the present invention that achieves the above object has a linear axis, and the length in the axial direction is λ, where λ is the wavelength of an electromagnetic wave to be transmitted or received. A cylindrical body made of a conductive material having a diameter of less than λ / 4, a notch having a length of λ / 2 is formed in a circumferential direction of the cylindrical body, and a cylindrical body is formed at one end of the cylindrical body. An end plate made of a conductive material having a larger diameter is fixed,
The other end of the cylindrical body is a movable antenna fixed to a conductive movable body larger than the cylindrical body. In the antenna for a mobile body, a ground plane portion forming a patch antenna is connected to one of two end plates. The patch antenna is incorporated in the mobile antenna in a state where the patch antenna is integrated and shared.

[0009] In the composite antenna device of these embodiments, a concave portion can be provided in the center of the end plate on the side where the patch antenna of the mobile object antenna is installed, and the patch antenna can be installed in the concave portion. . In this case, the patch antenna can be installed at a position in the recess that is offset from the center of the recess. Further, when a concave portion is provided at the center of the end plate of the mobile object antenna on which the patch antenna is installed, the bottom surface of the concave portion can be provided at a predetermined angle with respect to a horizontal plane.

[0010] In such a composite antenna device, an amplifier circuit board on which a circuit pattern for amplifying the output of the patch antenna is formed on the back side of the end plate on which the patch antenna is installed. According to the composite antenna device of the present invention, since the mobile object antenna is a planar cylindrical slot antenna, and the upper plane of the antenna is in a ground state, the patch antenna is superposed and installed on this upper plane to provide a composite antenna. The height of the antenna can be reduced.

In addition, the patch antenna can share a ground state in a state where the patch antenna is superimposed on the cylindrical slot antenna, and since each antenna operates in the same manner as when installed independently, the directivity of each antenna is not disturbed.

[0012]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1A shows a configuration of a composite antenna device 1 of the present invention, and FIG. 1B shows a state where the composite antenna device 1 is mounted on a roof 7 of an automobile 6. The composite antenna 1 is fixed on a metal roof 7 of an automobile 6 and connected to a receiver (not shown) installed in the trunk 9 by a feed line 20 such as a 50Ω coaxial cable.

The composite antenna device 1 of the present invention comprises a cylindrical slot antenna (hereinafter simply referred to as a slot antenna) 5 and a patch antenna 25. Therefore, FIG.
The power supply line 20 shown in (b) is, as shown in (a),
A coaxial table 12 for feeding power to the slot antenna 5,
And a coaxial cable 22 for feeding power to the patch antenna 25. The coaxial cable 12 has a center conductor 12a
And the outer conductor 12b.
2 has a center conductor 22a and an outer conductor 22b. The coaxial tables 12 and 22 are drawn into the inside of the composite antenna device 1 from the holes 21 and are connected to the slot antenna 5 and the patch antenna 25 inside. The connection between the coaxial table 12 and the slot antenna 5 and the connection between the coaxial table 22 and the patch antenna 25 will be described later.

The slot antenna 5 has a cylindrical body 10.
And end plates 16 and 17 fixed to both ends of the cylindrical body 10. The shape of the end plates 16 and 17 is a disk here, but is not limited to this shape, and may be a quadrangle or more polygons. Cylindrical body 10 and end plate 1
6 and 17 are made of a conductive material, for example, a metal such as copper or iron. Also, the height h1 of the cylindrical body 10 in the axial direction.
Is selected to be less than １ ／ of the wavelength λ of the electromagnetic wave to be transmitted or received. Further, a notch 11 which is a slot is formed in the cylindrical body 10 at the upper and lower central positions along the circumferential direction. The circumferential length of the notch 11 is selected to be λ / 2. The slot antenna 5 operates as a horizontal omnidirectional antenna that receives linearly polarized waves such as gap filler waves of satellite digital broadcasting.

In the patch antenna 25 used in the composite antenna device 1 of the present invention, an antenna pattern (patch element) 28 is generally provided on the upper surface of a dielectric substrate 27, as shown in FIG. The ground pattern 29 is provided on the lower surface. The dielectric substrate 27 is made of a ceramic member having a relative dielectric constant of about 10. When the power supply coaxial cable 22 is connected to the ground pattern 29 side, the center portion of the ground pattern 29 is peeled off, and the rod 8 connected to the patch element 28 is connected to this portion.
Are provided through the dielectric substrate 27. In the coaxial cable 22, the center conductor 22a is connected to the lower end of the rod 8 by soldering, and the outer conductor 22b is connected to the ground pattern 29 by soldering.

The patch antenna 25 has a structure shown in FIG.
As shown in FIG.
May be provided. The amplifier 30 is a dielectric substrate 31
The ground pattern 32 is formed on one side of the substrate, and the amplifier circuit pattern 33 is formed on the other side. The amplifier 30 is arranged such that the ground pattern 32 is overlapped with the ground pattern 29 of the patch antenna 25, and the patch element 28
The other end of the rod 8 whose one end is connected to the amplifier circuit pattern 33 of the amplifier 30 is extended and soldered. In this case, the center conductor 22a of the coaxial cable 22 is connected to the amplifier circuit pattern 33 by soldering, and the outer conductor 22b is connected to the ground pattern 34 on the amplifier circuit pattern 33 by soldering.

In the present invention, the patch antenna 25 shown in FIG. 2 (a) or (b) is, as shown in FIG.
It is installed at the center of the end plate 16 of the slot antenna 5.
The shape of the dielectric substrate 27 of the patch antenna 25 is not limited to a quadrangle, but may be a circle or a polygon having a quadrangle or more. The patch element 28 receives a circularly polarized wave, and is formed by providing a degenerate separation portion on a circular patch having a diameter of about 30 mm. In the present invention, as will be described later in detail, the end plate 16 of the slot antenna 5 is shared with the ground surface of the patch antenna 25.

The composite antenna device 1 configured as described above
Is used as a transmitting / receiving antenna of a car phone in the United States, the frequency band received by the slot antenna 5 is 820 to 890 MHz, so the outer diameter of the cylinder 10 is 6 cm (the outer peripheral length is 18.9 cm at this time). ), H1 is selected to be 2 cm, and the circumferential length of the notch 11 is 15.5c.
m. Since the width of the notch 11 in the axial direction may be a sufficiently small value with respect to the wavelength λ, the width can be set to about 3 mm. At this time, the outer diameter of the end plates 16 and 17 is, for example, 9
cm. Since the diameter of the patch antenna 25 is about 30 mm as described above, the patch antenna 25 operates as a 1.5 GHz band circularly polarized antenna. That is, the composite antenna device 1 of the present invention can support both a mobile communication system such as a mobile phone and a GPS receiving system.

FIG. 3 shows a first embodiment of the present invention. A slot antenna 5 constructed as shown in FIG. 1A and a patch antenna 25 constructed as shown in FIG.
The composite antenna device 1 of the first embodiment provided with
FIG. In the first embodiment, the ground pattern 29 of the patch antenna 25 shown in FIG.
It is integrated into.

The center conductor 12a of the coaxial cable 12 is connected to a feed point 13 on the upper edge of the notch 11, and the outer conductor 12b surrounding the center conductor 12a is connected to the lower side of the notch 11 immediately below the feed point 13. It is connected to a feed point 14 located at the edge. When the composite antenna device 1 is used as a transmitting / receiving antenna for a car phone in the United States, these feed points 1
3 and 14 are set at positions about 4 cm from one end of the notch 11. When the composite antenna device 1 is used as a transmitting / receiving antenna for a Japanese mobile phone having a frequency band of 860 to 940 MHz, the feeding points 13 and 14 are used.
May be the center of the entire length of the notch 11.
Further, by changing the distance between the feeding points 13 and 14 from the end of the notch 11, the slot antenna 5 can operate at 800 MHz.
It is possible to cope with transmission and reception of electromagnetic waves in a frequency band of about z to 1 GHz.

On the other hand, the center conductor 22a of the coaxial cable 22
Is connected to a feed point 23 at the lower end of the rod 8 connected to the patch element 28 of the patch antenna 25, and the outer conductor 22b surrounding this central conductor 22a is located at the edge of a hole 26 formed in the end plate 16. It is connected to the feeding point 24. And
The coaxial cables 12 and 22 have holes 21 formed in the cylindrical body 10.
From the composite antenna device 1.

The composite antenna device 1 is fixed to the metal roof 7 of the automobile 6 via a mounting member 19 made of an electrically insulating material, for example, a synthetic resin. The thickness of the mounting member 19 is selected to be, for example, 1 cm or more in order to prevent the composite antenna device 1 from being adversely affected by the roof 7. In the composite antenna device 1 configured as described above, the cylindrical body 10 of the slot antenna 5
Is vertical, the slot antenna 5 becomes a vertically polarized omnidirectional antenna. Since the mobile phone in Japan is vertically polarized, the slot antenna 5 of this embodiment can be used as it is as an antenna for a mobile phone. Also, the patch antenna 25
Since the upper end plate 16 of the slot antenna 5 is in the ground state, the slot antenna 5 having a height of 1/4 wavelength or less can be installed so as to share the ground state,
Receives electromagnetic waves for GPS. Therefore, in this case, the overall height of the composite antenna device 1 can be kept low.

Further, since the power supply cable 22 to the patch antenna 25 can be provided in the cylindrical body 10 of the slot antenna 5, the directivity of each antenna is not disturbed. Furthermore, since two types of antennas having different applications can be installed one on top of the other, the installation area can be reduced.
FIG. 4 also shows the first embodiment of the present invention, in which the composite antenna device 2 of the second embodiment including the slot antenna 5 and the patch antenna 25 is mounted on the roof 7 of the automobile 6. It is.

In the first embodiment, the cylindrical body 10 of the slot antenna 5 is provided with end plates 16 and 17 at both ends thereof, and the end plate 17 is made of metal via an insulating mounting member 19. It was installed on the roof 7 of the car 6. On the other hand, in the second embodiment, the lower end plate 17 of the slot antenna 5 is omitted, and the cylindrical body 10 is directly fixed to the roof 7 of the metal automobile 6. And different. this is,
The roof 7 is much larger than the end plate 17 and therefore the end plate 1
This is because the capacitance component required for the slot antenna 5 can be easily obtained by the roof 6 and the roof 7. The composite antenna device 2 according to the second embodiment differs from the composite antenna device 1 according to the first embodiment only in this point, and the other components are denoted by the same reference numerals as those in the first embodiment. The description is omitted.

FIG. 5 shows a second embodiment of the present invention, which is a combination of the slot antenna 5 and the patch antenna 25 having the amplifier 30 shown in FIG. 2 shows a state in which the antenna device 3 is attached to a roof 6 of a car 6. In the second embodiment, the amplifier 30 is located on the back side of the end plate 16 of the slot antenna 5, that is,
It is provided inside the cylinder 10. The ground pattern 29 of the patch antenna 25 and the ground pattern 32 of the amplifier 30 shown in FIG.
Are integrated with the end plate 16.

The second embodiment is different from the first embodiment in that an amplifier 30 is provided in a cylindrical body 10 of a slot antenna 5 with an earth pattern 32 integrated with an end plate 16. Only. In the composite antenna device 3 of the third embodiment, the slot antenna 5 and the patch antenna 2
Since the configuration of 5 and the configuration of mounting the composite antenna device 3 on the roof 7 of the automobile 6 are the same as those of the first embodiment, the same components are denoted by the same reference numerals and description thereof will be omitted.

FIG. 6 also shows a second embodiment of the present invention, in which the composite antenna device 4 of the fourth embodiment having a slot antenna 5 and a patch antenna 25 is mounted on a roof 6 of an automobile 6. It shows. In the third embodiment, the cylindrical body 10 of the slot antenna 5 is provided with end plates 16 and 17 at both ends thereof, and the end plates 17 are connected to the metallic automobile 6 via insulating mounting members 19. It was installed on the roof 7. On the other hand, in the fourth embodiment, the lower end plate 17 of the slot antenna 5 is omitted, and the tubular body 10 is directly fixed to the roof 7 of the metal automobile 6. Different from the example. The composite antenna device 4 of the fourth embodiment differs from the composite antenna device 3 of the third embodiment only in this point, and the other components are denoted by the same reference numerals as in the third embodiment. The description is omitted.

Next, an embodiment in which the directivity of the patch antenna 25 is changed by using the above-described composite antenna devices 1 to 4 of the present invention will be described with reference to FIGS. In order to avoid repetition of the description, an example in which the directivity of the patch antenna 25 is changed using the composite antenna device 1 described with reference to FIG. 3 will be described. However, in the embodiments described below, the composite antenna devices 2 to 4 will be described. Is similarly applicable.

FIG. 7A shows a simplified configuration of the composite antenna device 1 of the first embodiment described with reference to FIG. 3, in which only the outer shapes of the slot antenna 5 and the patch antenna 25 are shown, 11 and coaxial cables 12 and 22 are omitted. The patch antenna 25 is installed at the center of the flat end plate 16 of the slot antenna 5 in the first embodiment. FIG. 7B shows the patch antenna 2 of FIG.
FIG. 5 is a diagram illustrating directivity of a fifth example. Thus, when the patch antenna 25 is installed on the flat end plate 16,
As shown by the broken line, the axis of the main beam of the patch antenna 25 is perpendicular to the mounting surface of the patch antenna 25, and the directivity is wide (the half-value angle is large).

FIG. 7C shows the structure of a composite antenna device 35 according to a fifth embodiment of the present invention. The central portion of the flat end plate 16 of the slot antenna 5 shown in FIG. The patch antenna 25 is installed at the center of a concave portion 45 formed by slightly depressing. The shape of the recess 45 in plan view is not particularly limited, and does not need to match the shape of the dielectric substrate 27 of the patch antenna 25. FIG.
(d) is a diagram showing the directivity of the patch antenna 25 of FIG. 7 (c). As described above, when the patch antenna 25 is installed at the center of the relatively shallow concave portion 45 provided on the flat end plate 16, the axis of the main beam of the patch antenna 25 is indicated by a broken line. The directions are the same, and the half-value angle is slightly narrower than when the patch antenna 25 is installed on the flat end plate 16.

FIG. 7 (e) shows the structure of a composite antenna device 36 according to a sixth embodiment of the present invention, which is formed at the center of the end plate 16 of the slot antenna 5 shown in FIG. 7 (b). Deep recess 46 formed by further recessed recess 45
The patch antenna 25 is installed at the center of the. The shape of the recess 46 in plan view is not particularly limited.
FIG. 7F shows the directivity of the patch antenna 25 of FIG. 7E. When the patch antenna 25 is installed at the center of the deep concave portion 46 provided on the flat end plate 16, the axial direction of the main beam of the patch antenna 25 is the same as indicated by a broken line, The half-value angle is narrower than when the patch antenna 25 is installed at the center of the shallow recess 45.

FIG. 8A shows the configuration of a composite antenna device 37 according to a seventh embodiment of the present invention. The composite antenna device 36 of the sixth embodiment described with reference to FIG. This is a modified embodiment. In the sixth embodiment shown in FIG. 7E, the patch antenna 25 is installed at the center of the deep recess 46. On the other hand, in the seventh embodiment, the patch antenna 25 is located at a position offset from the center of the deep recess 46 to one side.
Is different from the sixth embodiment. Fig. 8 (b)
FIG. 9 is a diagram showing the directivity of the patch antenna 25 of FIG. When the patch antenna 25 is installed at a position offset from the center of the deep concave portion 46 provided on the flat end plate 16, as shown by the broken line, the axial direction of the main beam of the patch antenna 25 Is the patch antenna 25
Tilt in the direction opposite to the offset direction. The half-value angle is almost the same as when the patch antenna 25 is installed at the center of the deep recess 45.

FIG. 8C shows the configuration of a composite antenna device 38 according to an eighth embodiment of the present invention. In the eighth embodiment, a recess 47 having an inclined surface is formed in the flat end plate 16 of the slot antenna 5 shown in FIG.
The patch antenna 25 is provided at the center of the inclined surface of the concave portion 47. The shape of the recess 47 in plan view is not particularly limited. FIG. 8D is a diagram showing the directivity of the patch antenna 25 of FIG. 8C. An inclined recess 47 in which the patch antenna 25 is provided on the end plate 16
In the case where the main beam of the patch antenna 25 is located in the center of the
And is inclined with respect to the plane formed by the end plate 16. Further, the half-value angle differs depending on where on the inclined surface of the concave portion 47 the patch antenna 25 is installed.

The composite antenna device 38 in which the axial direction of the main beam of the patch antenna 25 is inclined with respect to the plane formed by the end plate 16 is a moving body, for example, the roof of the automobile 6 shown in FIG. 7 forward and backward
Can be installed at an angle of 80 degrees. Then, the composite antenna device 38 can be used for applications such as a diversity antenna.

In the above embodiment, the embodiment in which the electromagnetic wave is received by the composite antenna device has been described. However, the composite antenna device of the present invention can also be used as a transmitting antenna.

[0036]

As described above, according to the composite antenna device of the present invention, the following effects can be obtained. (1) Since the cylindrical slot antenna and the patch antenna can be installed in an overlapping manner, the installation area can be reduced.

(2) Since the ground plane of the patch antenna and the end plate of the cylindrical slot antenna are shared, one of the grounds is not required, a simple configuration can be achieved, and the cost of the composite antenna device can be reduced. it can. (3) Depress the end plate of the cylindrical slot antenna to make it concave.
By installing the patch antenna therein, the height of the composite antenna can be reduced.

(4) By changing the depth of the recess,
By narrowing the beam of the patch antenna, an antenna with high directivity can be realized. (5) The beam direction of the patch antenna can be changed by offsetting the installation position of the patch antenna in the recess from the center of the recess. (6) The beam direction of the patch antenna can be changed by inclining the bottom surface of the concave portion where the patch antenna is installed from the horizontal plane.

(7) When an amplifier circuit is incorporated in the patch antenna, the amplifier circuit can be installed inside the end plate and the cylinder, and the overall height of the composite antenna device can be reduced.

[Brief description of the drawings]

FIG. 1A is a perspective view showing a configuration of a composite antenna device of the present invention, and FIG. 1B is a partial perspective view showing a state where the composite antenna device of FIG.

2A is a cross-sectional view illustrating a configuration of a conventional patch antenna alone, and FIG. 2B is a cross-sectional view illustrating a configuration of a conventional patch antenna with an amplifier.

FIG. 3 is a partial longitudinal sectional view showing a state in which the first embodiment of the composite antenna device according to the present invention is mounted on a roof of an automobile.

FIG. 4 is a partial longitudinal sectional view showing a second embodiment of the composite antenna device according to the present invention mounted on a roof of an automobile.

FIG. 5 is a partial longitudinal sectional view showing a third embodiment of the composite antenna device according to the present invention mounted on a roof of an automobile.

FIG. 6 is a partial longitudinal sectional view showing a fourth embodiment of the composite antenna device according to the present invention mounted on a roof of an automobile.

FIG. 7A is a diagram showing a state in which a patch antenna is installed at the center of an end plate of a flat cylindrical slot antenna, and FIG.
(A) is a diagram showing the directivity of the patch antenna, and (c) is a state in which the patch antenna is installed in the center of a concave portion formed by slightly depressing the center of the end plate of the flat cylindrical slot antenna. The figure (d) shows the directivity of the patch antenna of (c), and the figure (e) shows the patch antenna in the center of the concave part formed by deeply depressing the center of the end plate of the flat cylindrical slot antenna. FIG. 7F is a diagram showing a state in which the patch antenna is installed, and FIG.

FIG. 8A is a view showing a state in which a patch antenna is installed by offsetting a center portion of an end plate of a flat cylindrical slot antenna into a concave portion formed by deeply recessing, and FIG. The figure showing the directivity of the patch antenna, (c) is a figure showing a state where the patch antenna is installed on a slope formed by diagonally recessing the end plate of a flat cylindrical slot antenna, and (d) is (c)
FIG. 4 is a diagram showing the directivity of the patch antenna of FIG.

FIG. 9 shows the composite antenna device of FIG.
It is a partial side view showing the state where it changed by 80 degrees, and was installed on the roof of the car.

[Explanation of symbols]

 1-4, 35-38 composite antenna device 5 slot antenna 10 cylindrical body 11 notch (slot) 12, 22, 20 power supply line (coaxial cable) 13, 14, 23, 24 power supply point 16, 17 ... End plate 19 ... Mounting member 25 ... Patch antenna 30 ... Amplifier 32 ... Dielectric substrate 33 ... Amplifier circuit pattern 45-48 ... Recess

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H01Q 21/24 H01Q 21/24 F term (reference) 5J021 AA02 AA13 AB05 AB06 CA02 HA05 HA06 HA07 JA03 JA05 5J045 AA21 AB05 BA01 CA01 CA04 DA03 DA10 EA03 EA07 HA06 LA01 NA01 NA02 NA03 NA04 NA08 5J046 AA04 AA12 AA19 AB08 AB13 MA09 5J047 AA04 AA12 AA19 AB08 AB13 EB00

Claims (6)

[Claims] 1. A cylindrical body made of a conductive material having a linear axis and having a length in the axial direction less than λ / 4 when a wavelength of an electromagnetic wave to be transmitted or received is λ. A notch having a length of λ / 2 is formed in the circumferential direction of the cylindrical body, and end plates made of a conductive material having a larger diameter than the cylindrical body are fixed to both ends of the cylindrical body. In a state where a ground plane portion constituting a patch antenna is integrated with and shared with one of the two end plates, the patch antenna is mounted on the moving object antenna. A composite antenna device characterized by being incorporated in a device. 2. A cylindrical body having a linear axis, the length of which in the axial direction is less than λ / 4, where λ is the wavelength of an electromagnetic wave to be transmitted or received. A notch having a length of λ / 2 is formed in the circumferential direction of the cylindrical body, and an end plate made of a conductive material having a larger diameter than the cylindrical body is fixed to one end of the cylindrical body. The other end of the cylindrical body is a moving body antenna fixed to a conductive moving body larger than the cylindrical body. The ground plane portion forming the patch antenna is connected to one of the two end plates. A composite antenna device, wherein the patch antenna is incorporated in the mobile object antenna in a state of being integrated with and shared with an end plate of the present invention. 3. The composite antenna device according to claim 1, wherein a concave portion is provided in a center portion of an end plate of the movable body antenna on a side where the patch antenna is installed, and the patch antenna is provided with a concave portion. A composite antenna device provided in a recess. 4. The composite antenna device according to claim 3, wherein the patch antenna is installed at a position offset from a center of the concave portion in the concave portion. 5. The composite antenna device according to claim 3, wherein a bottom surface of the concave portion is provided to be inclined at a predetermined angle with respect to a horizontal plane. 6. The composite antenna device according to claim 1, wherein a back surface of the end plate on which the patch antenna is installed is provided.
A composite antenna device comprising an amplifier circuit board on which a circuit pattern for amplifying the output of the patch antenna is formed.