JPH02134004A - Plane antenna - Google Patents

Abstract

PURPOSE:To eliminate the need for forming a long lead line by forming a missing part of a feeder near the middle of a feeding circuit board and providing a feeding point to the missing part. CONSTITUTION:A missing part 8 of a feeder 4a is formed around the middle of a 1st feeding circuit board 2a and a radiation element 5a in a 2nd radiation circuit board 3a corresponding to the missing part 8 has a missing part. A feeding point 6a is formed to the missing part 8 of the 1st feeding circuit board 2a, while a feeding point is taken in the 2nd feeding circuit board 2b corresponding to the position 6b. Thus, the 1st and 2nd feeding boards 2a, 2b are fed around the middle respectively in this way. Thus, it is not required to form a long lead line and the loss is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a microwave planar antenna that includes a pair of feeding circuit boards and is capable of transmitting and receiving polarized waves orthogonal to each other.

[Prior Art] Conventionally, as shown in FIG. 2, this type of planar antenna has a pair of feeder circuit boards 2a, 2b and a radiation circuit board 3a3b arranged substantially parallel to each other on one side of a ground plane 1 made of a conductor. A configuration is being considered in which the The ground plate 1, the first feeding circuit board 2a, the first radiating circuit board 3a, the second feeding circuit board 2b, and the second radiating circuit board 3b are laminated in order at appropriate intervals, and the first feeding circuit board 2a and the second radiating circuit board 3b 1 radiation circuit board 3a
2nd feeding circuit board 2b and 2nd radiation circuit board 3b
are formed so that their polarizations are orthogonal. That is, as shown in FIG. 3, the first feeder circuit board 2a and the second feeder circuit board 2b have feeder lines 4a whose patterns are rotated 90 degrees from each other.
, 4b. The feed lines 4a, 4b of each feed circuit board 2a, 2b are electromagnetically coupled to the corresponding radiation elements 5a, 5b of each radiation circuit board 3a, 3b.

By the way, the power supply points 6a, 6b for the power supply lines 4a, 4b
is formed in the center of each feeder circuit board 2a, 2b, so the feeder point 6a on the first feeder circuit board 2a and the feeder point 6b on the second feeder circuit board 2b overlap vertically. Therefore, it is not possible to pull out the power supply leads in a direction perpendicular to each power supply circuit board 2a, 2b.

In order to solve this problem, as shown in FIG. 4, a configuration has been proposed in which the ends of lead lines 7a and 7b are extended to the periphery of power supply circuit boards 2a and 2b to form power supply points 6a and 6b.

[Problems to be Solved by the Invention] In the conventional configuration described above, since the lead lines 7a and 7b are relatively long, a problem arises in that the loss in the lead lines 7a and 7b increases and the efficiency of the antenna decreases. Was.

The present invention aims to solve the above-mentioned problems, and provides a planar antenna that can transmit and receive mutually orthogonal polarized waves, reduces loss, and improves efficiency.

[Means for Solving the Problems] In the present invention, in order to achieve the above object, a missing portion is provided in the feeder line near the center of at least one of the first feeder circuit board and the second feeder circuit board. At the same time, the radiating element of the corresponding radiating circuit board is removed, and a feeding point is provided in the missing portion of the feeding line.

[Operation] According to the above configuration, the missing portion of the feeder line is formed near the center of the feeding circuit board, and the feeding point is provided in this missing portion, so that the feeding point of the pair of feeding circuit boards is Both feed points can be formed near the center of the feed circuit board even though the positions of , the antenna gain is improved.

[Embodiment] The basic configuration is as shown in FIG. 2, and as explained in the section of "Prior Art", first power supply circuits are connected at appropriate intervals on one side of the main plate 1 made of a conductor. board 2a,
The first radiating circuit board 3a, the second feeding circuit board 2b, and the second radiating circuit board 3b are sequentially stacked. A dielectric material may be inserted into each space as necessary. Patterns that become power feed lines 4a and 4b are formed on each of the power feed circuit boards 2a and 2b, respectively. Further, each radiation circuit board 3a, 3b includes a radiation element 5a,
A pattern 5b is formed. Power supply lines 4a, 4
b and the radiating elements 5a, 5b each have a pattern of turning edges. Power supply line 4a.

4b are formed in a positional relationship rotated by 90 degrees with respect to each other.

By the way, as shown in FIG. 1, in the first feeder circuit board 2a, a missing portion 8 of the feeder line 4a is formed near the center, and in the first radiation circuit board 3a, a missing portion 8 is formed to correspond to this missing portion 8. The radiating element 5a is also missing. A power feeding point 6a is formed in the missing portion 8 of the first power feeding circuit board 2a. On the other hand, regarding the second power supply circuit board 2b, 6b is shown in FIG.
Corresponding to the position indicated by , the feeding point is set at the center of the second feeding circuit board 2b. This eliminates the need to form long lead lines as in the past, reducing losses. The first power supply circuit board 2a and the second power supply circuit board 2b are supplied with power in the same phase or with a phase difference of an integral multiple of 360°.

Further, in the defective portion 8, since the ground plate 1 acts as the ground side of the second feed circuit board 2b, there is an advantage that the radiation efficiency by the second feed circuit board 2b and the second radiation circuit board 3b is improved.

In the above embodiment, the missing portion 8 of the feeder line 4a is formed on the first feeder circuit board 2a, but the missing portion 8 of the feeder line 4a is formed on the first feeder circuit board 2b.
A defective portion 8 may be formed near the center at a position different from that of the power supply circuit board 2a, and power may be supplied through the defective portion 8.

For example, the base plate 1 used in the above configuration is 2xz
The first power supply circuit board 2a is laminated with a dielectric layer made of foamed polyethylene interposed therebetween. Each of the feeding circuit boards 2a, 2b and the second radiation circuit board 3b is formed by etching a printed circuit board to form the patterns of the feeding circuit boards 4a, 4b and the radiation element 5b. A thick polyester sheet laminated with a 35 pm thick silver foil can be used. The radiating element 5a of the first radiating circuit board 3a is formed by punching slots of 3×1×13zx in a 0.2JIj+thick aluminum plate, with a vertical pitch of 1lzx and a horizontal pitch of 22 degrees. They are arranged in a 32x16 matrix. In addition, slots are deleted in an area corresponding to 12 slots in the center. Second radiation circuit board 3b
The radiating element 5b is formed in the shape of having an 8iv x 2-layer rectangular patch element inside a square annular slot with sides of 20 mm, and has a 16 x 16 patch element with a pitch of 221R.
are arranged in a matrix. On the other hand, the power supply lines 4a, 4
b is formed so as to be electromagnetically coupled to the radiating elements 5a and 5b formed as above. Regarding the first feeder circuit board 2a, a missing portion 8 is formed in six elements in the center, and this missing portion 8 is made to correspond to the missing portion of the slot of the first radiation circuit board 3a. Here, a dielectric layer made of foamed polyethylene is interposed in the gaps formed between each of the feeding circuit boards 2a and 2b and each of the radiation circuit boards 3a and 3b. For the planar antenna thus formed, a feed point is provided at the missing portion 8 on the first feed circuit board 2a and at the center on the second feed circuit board 2b.

Here, a difference of 360° is provided in the power supply phase between the first power supply circuit board 2a and the second power supply circuit board 2b.

When the planar antenna formed in this way was compared with a conventional planar antenna whose lead pattern was extended to the end of the feeding circuit board to feed power, it was found that the horizontal polarization was 0.5 to 0. 0.7dB, 0.7dB for vertical polarization.
An antenna gain improvement of 6-0.9 dB was obtained. However, the first feeding circuit board 2a and the first radiation circuit board 3a are horizontal (corresponding to both waves).

[Example 2] In the above example, the missing portion 8 of the feeder line 4a of the first radiation circuit board 3a is for 6 elements, but when this is changed to 4 elements, compared to the conventional configuration, 0.6 for horizontal polarization
An antenna gain improvement of ~0.9 dB and 0°8 to 1.0 dB for vertical harmonics was observed.

[Example 3] In implementation rFA1, slots were formed by punching in the first radiation circuit board 3a, but when slots were formed by etching in a printed board similar to the second radiation circuit board 3b, the results were similar to those in Example 1. In comparison, an improvement in antenna gain of 0.3 to 0.5 dB was observed.

Example 4] Even when punching holes were formed in a grid pattern in the foamed polyethylene sheet serving as the dielectric layer, characteristics equivalent to those obtained when punching holes were not formed were obtained.

[Example 5] When power was supplied in the same phase to the first power supply circuit board 2a and the second power supply circuit board 2b, characteristics equivalent to those obtained when there was a 360° phase difference were obtained.

[Effects of the Invention] As described above, the present invention provides a defective portion in the feeder line near the center of at least one of the first feeder circuit board and the second feeder circuit board, and also The radiating element is missing and the feeding point is provided in the missing part of the feeder line.The missing part of the feeder circuit board where the feeder line is missing is formed near the center of the feeder circuit board. Because the feed point is provided, even though the feed points of a pair of feed circuit boards are shifted, both feed points can be formed near the center of the feed circuit board, allowing a long lead line to be formed as in the conventional case. As a result, the transmission loss due to the lead line is reduced and the antenna gain is improved.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an example of the shape of the feeder line according to the present invention, Fig. 2 is an exploded perspective view showing the basic configuration of the planar antenna according to the present invention, and Fig. 3 is a typical example of the feeder line. FIG. 4 is a front view showing a conventional example of a power supply line. DESCRIPTION OF SYMBOLS 1... Ground plate, 2a... 1st power supply circuit board, 2b...
Second feeding circuit board, 3a...First radiation circuit board, 3b...
- Second radiating circuit board, 4a, 4b... feeding line, 5a, 5b... radiating element, 6a, 6b... feeding point, 8... missing part.

Claims (1)

[Claims] (1) A first feeder circuit board, a first radiation circuit board, a second feeder circuit board, and a second radiation circuit board are laminated in order on one side of a ground plate made of a conductor with appropriate intervals, and the first feeder circuit board In a planar antenna in which the polarizations of the board and the first radiating circuit board, the second feeding circuit board, and the second radiating circuit board are orthogonal to each other, the center of at least one of the first feeding circuit board and the second feeding circuit board. What is claimed is: 1. A planar antenna characterized in that a missing portion is provided in a feeding line near the portion of the feeding line, a radiating element of a corresponding radiation circuit board is missing, and a feeding point is provided in the missing portion of the feeding line.