JPH1127033A - Planar antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plane antenna which excels in the accuracy of a space between a ground conductor and a feeding substrate and vice versa and also excels in both gain and directivity. SOLUTION: This antenna consists of a ground conductor 1, a dielectric substance 2, a feeding substrate 3 which has plural radiation elements 5 arranged by a fixed array rule and the feeder lines 6 connected to the elements 5, a dielectric substance 21 and a ground conductor 4 which has the slots 7 corresponding to the elements 5, which are all laminated in that order. In such a constitution, the fixing holes, instead of the elements 5, are prepared in place of the elements 5 placed at the parts selected from at least two sides opposite to each other among those elements 5 which are placed at the outermost circumference of the antennas. The fixing holes, instead of the slots 7, are also prepared in place of the slots 7 at the parts of the slots 7 corresponding to the holes serving as the elements 5. Then the conductor 1, the substance 2, the substrate 3, the substance 21 and the conductor 4 are fixed via those fixing holes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar antenna used for transmitting and receiving microwaves and millimeter waves.

[0002]

2. Description of the Related Art As a method of increasing the antenna efficiency of a planar antenna, it is known to reduce a feed loss by using a triplate line. As shown in FIG. 4 (a), the basic configuration of this type of antenna is such that a ground conductor 1, a dielectric 2, a plurality of radiating elements 5 arranged according to a fixed arrangement rule, and the radiating elements 5 are connected. And a ground conductor 4 in which a plurality of slots 7 are formed at positions corresponding to the radiating elements 5 in a stacked arrangement in this order. The radiating element 5 has a patch shape, but as shown in FIG. 4B, there is a radiating element 5 which is a parasitic element and is formed on the same plane as the ground conductor 4 in which the slot 7 is formed.

[0003] In any of such antennas, the feed line 6 is a triplate line which is surrounded by the ground conductor 1 and the ground conductor 4 and is electromagnetically shielded. Unnecessary radiation from discontinuous places such as the above can be suppressed, and a highly efficient antenna can be configured.

In this type of antenna, the distance between the power supply substrate 3 and the ground conductor 1 and the distance between the power supply substrate 3 and the ground conductor 4 are kept constant in order to maintain the characteristics of the antenna at the time of initial design. There is a need. For this purpose, usually, as shown in FIG. 5A, the radiating element 5, the feed line 6, and the slot 7 are provided.
A hole for fixing is provided in a place where there is no hole, and a hole or a hole is made in a place corresponding to the fixing hole in the ground conductor 1 to form a female screw. The female screw is fixed so as to be tightened by a hole or a hole formed. Further, when the operating frequency increases and the interval between the radiating elements 5 becomes narrow, the area where the radiating element 5 and the feed line 6 are formed has no area for providing fixing holes, and FIG.
As shown in (b), a fixing hole is provided instead of the radiation element 5.

[0005]

In order to use such an antenna at a high frequency such as a quasi-millimeter wave band or a millimeter wave band, the physical shape of the radiating element 5, the feed line 6, and the like becomes small and high. Accuracy is required, and the structure must be able to accurately maintain the distance between the ground conductor 1 and the power supply board 3 and the distance between the power supply board 3 and the ground conductor 4. Therefore, as shown in FIG. 6, it is conceivable to dispose screws so that the whole can be fixed in a well-balanced manner. As the antenna gain decreases, the side lobes become large and the directivity decreases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a planar antenna which is excellent in the accuracy of the distance between the ground conductor 1 and the power supply board 3 and the distance between the power supply board 3 and the ground conductor 4, and is excellent in gain and directivity.

[0007]

According to the planar antenna of the present invention, a ground conductor 1, a dielectric 2, a plurality of radiating elements 5 arranged according to a certain arrangement rule, and a feed line connected to the radiating elements 5 are provided. And a power supply substrate 3 having a dielectric 21 formed thereon.
And a ground conductor 4 in which a plurality of slots 7 are formed at positions corresponding to the radiating element 5, and the planar antenna is formed by stacking in this order, and among the radiating elements 5 arranged at the outermost periphery of the antenna, A fixing hole is provided instead of the radiating element 5 at a location selected from at least two opposing sides, and a fixing hole is provided at the corresponding slot 7 instead of the slot 7. , Ground conductor 1 and dielectric 2
And the power supply board 3, the dielectric 21, and the ground conductor 4 are fixed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A fixing hole provided in place of the radiating element 5 and a fixing hole provided in place of the corresponding slot 7 can be provided substantially at the center of the antenna.

A fixing means is a screw, a spacer through which a screw is provided is provided between the ground conductor 1 and the dielectric 2, a hole or a hole is made in the ground conductor 1 at a position corresponding to the fixing hole, and a female screw is formed. It may be formed in advance, and a male screw may be passed through the ground conductor 4 and the female screw of the ground conductor 1 may be fixed by tightening the hole or hole.

[0010]

EXAMPLE A 5 mm-thick aluminum plate was used as the ground conductor 1, and as a power supply substrate 3, unnecessary copper foil of a flexible substrate in which a copper foil was bonded to a polyimide film was removed by etching to form a patch-shaped radiating element 5. And the feed line 6 were formed. Radiating element 5, a 0.26 times a free space wavelength lambda ₀ of utilizing frequency 60GHz as square patch-like to the length of one side, sequences 0 of the free space wavelength lambda ₀ apart.
Eight times, an array of 16 × 16 was used. Slots 7 were formed at intervals of 0.26 times the free space wavelength λ ₀ , which is the same as the arrangement interval of the radiating elements 5, using an aluminum plate having a thickness of 1 mm as the ground conductor 4. Dielectric 2 and dielectric 21
A polyethylene foam having a thickness of 0.5 mm and a relative dielectric constant of 1.1 was used. As shown in FIG. 2, eight locations where the radiating element 5 is not formed are selected from one location substantially at the center of the antenna and two opposing sides. As the spacer 10, an annular aluminum spacer was used. The antenna thus manufactured has a gain of 60 GHz.
29 to 30 dB were obtained, and good characteristics of about 40% in efficiency were obtained. At this time, the antenna size is 7
It was 5 mm x 75 mm. In addition, an ideal pattern was obtained for the directivity as shown in FIG.

[0011]

As described above, according to the present invention, it is possible to provide a planar antenna excellent in accuracy, gain and directivity.

[Brief description of the drawings]

FIGS. 1A and 1B both show an embodiment of the present invention.

FIG. 2 is a top view showing another embodiment of the present invention.

FIG. 3 is a diagram for explaining the effect of the present invention.

4A and 4B are exploded perspective views showing a conventional example.

FIGS. 5A and 5B are exploded perspective views showing other conventional examples.

FIG. 6 is a top view for explaining the problem of the present invention.

[Explanation of symbols]

 1. Earth conductor 2, 21. Dielectric 3. Power supply board 4. Earth conductor 5. Radiating element 6. Feeding line 7. Slot 8. Screw 9. Fixture 10. Spacer

Claims (3)

[Claims] 1. A ground conductor 1, a dielectric 2, a plurality of radiating elements 5 arranged according to a fixed arrangement rule, and the radiating elements 5
A power supply substrate 3 having a power supply line 6 connected thereto, a dielectric 21, and a ground conductor 4 having a plurality of slots 7 formed at positions corresponding to the radiating elements 5 are stacked and arranged in this order. In the antenna, among the radiating elements 5 arranged on the outermost periphery of the antenna, fixing holes are provided in place of the radiating elements 5 selected from at least two opposing sides, and the corresponding slots 7 are provided at the corresponding holes. Also, a fixing hole is provided instead of the slot 7, and the ground conductor 1 and
A planar antenna, wherein a dielectric 2, a feed board 3, a dielectric 21, and a ground conductor 4 are fixed. 2. A fixing hole provided in place of the radiating element 5,
2. The planar antenna according to claim 1, wherein one fixing hole provided in place of the corresponding slot is provided substantially at the center of the antenna. 3. The fixing means is a screw, a spacer through which a screw is provided is provided between the ground conductor 1 and the dielectric 2, and a hole or a hole is formed in the ground conductor 1 at a position corresponding to the fixing hole. The planar antenna according to claim 1 or 2, wherein a female screw is formed, and a male screw is passed through the ground conductor (4) and the female screw of the ground conductor (1) is fixed by tightening the hole or the hole.