JP2002198726A - Antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna 30 that employs a patch antenna 10 that receives a circularly polarized wave from a satellite and can optionally set a position of an output terminal 32. SOLUTION: A printed circuit board 34 is placed on a rear side of the patch antenna 10 on the front side of which a plane electrode 10b is placed, a ground electrode 34a is placed on a side of the printed circuit board 34 toward the patch antenna 10, a strip conductor 34b is provided on the opposite side to configure a microstrip line, and the microstrip line electrically interconnects a feeder terminal 10d of the patch antenna 10 and the output terminal 32 placed at a desired position of the printed circuit board 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device using a patch antenna for receiving a circularly polarized signal radiated from a satellite, wherein the position of an output terminal can be arbitrarily set. Things.

[0002]

2. Description of the Related Art An example of a conventional detachable antenna device using a patch antenna will be briefly described with reference to FIGS. FIG. 5 is a longitudinal sectional view of a conventional antenna device using a patch antenna. FIG. 6 is a perspective view showing a state where the antenna device is separated from the device. In FIG. 5, the patch antenna 10 has, for example, a substantially square planar electrode 10b on the surface of a ceramic dielectric plate 10a and a ground electrode 10c on the entire back surface. A power supply terminal 10d is provided through the dielectric plate 10a and the ground electrode 10c, and is electrically connected to the flat electrode 10b by soldering or the like. The power supply terminal 10d is connected to the ground electrode 1
Of course, it is not electrically connected to 0c. And
The position where the power supply terminal 10d is electrically connected to the plane electrode 10b must be at a predetermined power supply point in order to satisfy the electrical characteristics for receiving a circularly polarized signal. The patch antenna 10 is attached to the metal base 12 with a double-sided tape, and is assembled so that a case 14 made of a resin material as a radome covers the patch antenna 10. Further, the power supply terminal 10d penetrates through the inside of the cylindrical body 12a provided on the metal base 12 to form a coaxial cable structure. Note that, in FIG.
Reference numeral 16 denotes an insulating spacer for stably fixing the power supply terminal 10d in the cylindrical body 12a.

As shown in FIG. 6, an antenna device 18 having such a structure is detachably provided in a power supply connection hole 20a provided in a device 20 equipped with a GPS or the like.

[0004]

In the conventional antenna device 18 as described above, the feeding terminal 10d provided at a predetermined position of the patch antenna 10 is directly connected to the device 20.
Therefore, the relative mounting position of the antenna device 18 with respect to the device 20 cannot be set arbitrarily. This is a great restriction in designing the outer shape of the antenna device 18 and the like. In particular, when the antenna device 18 is provided in a mobile phone or a portable small data terminal device, miniaturization and overall appearance design may be hindered.

[0005] The present invention has been made in view of the circumstances of the conventional antenna device as described above, and has as its object to provide an antenna device in which an output terminal can be provided at a desired position.

[0006]

In order to achieve the above object, an antenna device according to the present invention comprises a circuit board provided on a back surface of a patch antenna having a planar electrode provided on a surface of a dielectric plate. A microstrip line is provided on the circuit board, and a feeder terminal of the patch antenna and an output terminal provided at a desired position on the circuit board are electrically connected by the microstrip line.

Then, the circuit board is adhered to the back surface of the patch antenna with a double-sided tape, a ground electrode is provided on the patch antenna side surface of the circuit board, and the microstrip line is provided on the opposite surface. It is also possible to provide a strip conductor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view of an embodiment of the antenna device of the present invention. FIG. 2 is a cross-sectional view of FIG.
It is a figure of the surface of a patch antenna of an arrow. FIG.
FIG. 4 is a diagram of the surface of the circuit board as viewed from the direction of arrows BB in FIG. FIG. 4 is a diagram of the back surface of the circuit board. 1 and 2, the same or equivalent members as those shown in FIG.

The patch antenna 10 used in the antenna device 30 of the present invention is basically the same as that used in the conventional antenna device 18, except that a concave portion 10e is provided on the back surface facing the output terminal 32 provided at a desired position. Have been. Then, a circuit board 34 made of a dielectric material is adhered and fixed to the back surface of the patch antenna 10 with a double-sided tape (not shown). A ground electrode 34a is provided on almost the entire surface of the circuit board 34 on the patch antenna 10 side except for a land portion to which the power supply terminal 10d and the output terminal 32 are connected, and a strip conductor 34b is provided on the opposite surface. To form a microstrip line. A feed terminal 10d of the patch antenna 10 is electrically connected to one end of the microstrip line by soldering, and an output terminal 32 is electrically connected to the other end of the microstrip line by soldering. Note that another ground electrode 34c is provided so as to surround the strip conductor 34b of the circuit board 34.

Further, the back surface of the circuit board 34 is adhered and fixed on the metal base 12 with a double-sided tape (not shown), and the output terminal 32 is provided on the metal base 12 in a cylindrical body 12a.
To form a coaxial cable structure. Also,
A case 14 is attached to the metal base 12 so as to cover the patch antenna 10. The case 14 is made of a resin material having an appropriate dielectric constant and, of course, functions as a radome.

The assembling of the antenna device 30 having such a configuration is as follows.
First, the output terminal 32 is attached to the metal base 12, and then the circuit board 34 is attached on the metal base 12 with a double-sided tape, and the output terminal 32 is soldered to the strip conductor 34b of the microstrip line. Further, the patch antenna 10 is stuck on the circuit board 34 with a double-sided tape, and the power supply terminal 10 d is soldered to the strip conductor 34 b by inserting a soldering iron through the hole 12 b provided in the metal base 12. Then, the case 14 is assembled to the metal base 12 to complete the assembly.

In the above-described antenna device 30 of the present invention, the output terminal 32 provided at a desired position on the circuit board 34 and the feed terminal 10d of the patch antenna 10 are electrically connected by a microstrip line. It can be arranged at any desired position on the circuit board 34. Therefore, the antenna device 30 can be freely designed without any design restrictions.
It is possible to design

In the above embodiment, the antenna device 30 that is detachable from the device 20 has been described. However, the present invention is not limited to this, and the antenna device 30 may be fixed to the device 20. In such a case, it will be easily understood that the metal base 12 and the case 14 may be appropriately changed in design or omitted as needed. Further, the microstrip line is constituted by a strip conductor 34b provided on a surface opposite to a ground electrode 34a provided on one surface of the circuit board 34.
Instead of 4a, a microstrip line may be configured using a ground electrode 10c disposed on the back surface of the dielectric plate 10a of the patch antenna 10.

[0014]

As described above, since the antenna device of the present invention is constituted, the following special effects can be obtained.

In the antenna device according to the first aspect,
By providing a circuit board on the back surface of the patch antenna and electrically connecting the power supply terminal to the output terminal, the output terminal can be set at any desired position. Therefore, the antenna device can be freely designed without any design restrictions.

In the antenna device according to the second aspect,
A circuit board is disposed on the back surface of the patch antenna with a double-sided tape, and a microstrip line is formed by a strip conductor provided on a surface opposite to a ground electrode provided on one surface of the circuit board. And the impedance of the power supply terminal and the output terminal can be easily matched.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of an antenna device according to the present invention.

FIG. 2 is a diagram of a surface of the patch antenna as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a view of the surface of the circuit board as viewed in the direction of arrows BB in FIG. 1;

FIG. 4 is a diagram of the back surface of the circuit board.

FIG. 5 is a longitudinal sectional view of a conventional antenna device using a patch antenna.

FIG. 6 is a perspective view showing a state in which the antenna device is separated from a device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Patch antenna 10a Dielectric plate 10b Planar electrode 10c, 34a, 34c Ground electrode 10d Feeding terminal 18, 30 Antenna device 32 Output terminal 34 Circuit board 34b Strip conductor

Continued on the front page (72) Inventor Hidekatsu Asai 1112 Shinnohara, Tomioka City, Gunma Prefecture Inside Yokoo Tomioka Plant Co., Ltd. (72) Inventor Tomio Abe 1112 Shinnohara, Tomioka City, Gunma Prefecture F-term inside Yokoo Tomioka Plant Co., Ltd (Reference) 5J045 AA01 AB06 DA10 EA07 HA06 NA01 5J047 AA09 AA12 AB13 EF04 FD01

Claims (2)

[Claims] 1. A circuit board is provided on a back surface of a patch antenna having a planar electrode provided on a surface of a dielectric plate, a microstrip line is provided on the circuit board, and the patch antenna is provided by the microstrip line. And an output terminal disposed at a desired position on the circuit board. 2. The antenna device according to claim 1, wherein
Affixing the circuit board with a double-sided tape on the back surface of the patch antenna, providing a ground electrode on the surface of the circuit board on the patch antenna side, and providing a strip conductor of the microstrip line on the opposite surface. An antenna device comprising: