JPH01137803A - Microwave strip antenna - Google Patents

Abstract

PURPOSE:To simplify the constitution regardless of a multi-layer printed circuit board to be employed by using a two-layer printed circuit board so as to apply excitation from a feeding system made of a tri-plate line to a radiation element through electromagnetic coupling thereby preventing the degradation of the antenna radiation efficiency. CONSTITUTION:1st-3rd conductor plates 11-13 form a tri-plate line while interposing 1st and 2nd insulation layers 14, 15, the radiation element 16 is insulated from the 3rd conductor plate 13 forming the uppermost face via a ring slot 17 and a pattern is formed to the conductor plate 13. A tri-plate line center conductor 18 is arranged along the 2nd conductor plate 12 so as to correspond nearly to the center position of the radiation element 16, the open end 19 of the tri-plate line center conductor 18 and the ring slot 17 subjected to electromagnetic coupling to apply feeding. Thus, the constitution is simplified regardless of employing the multi-layer printed circuit board without degradation of the radiation efficiency of the antenna.

Description

Detailed Description of the Invention [Technical Field of the Invention] Jin's invention relates to a microwave strip antenna used for receiving satellite broadcasting and the like.

[Prior Art and Its Disadvantages] The pattern of a conventional 16-element microstrip array antenna is shown in FIG. In the figure, 1 is a radiating element,
2 is a power supply line system. The 16 radiating elements 1 and the feed line system 2 are patterned with the same conductor, and therefore can be constructed from a -layer printed circuit board.
Easy and highly productive. However, on the other hand, there is unnecessary radiation from the feed line system 2, making it difficult to achieve high antenna efficiency.

In order to decide the above points, the feed Tj1 line system is constructed of triplate lines using a three-layer printed circuit board as shown in Fig. 6, and a radiating element is formed on it via an insulating layer. An antenna configuration in which a conductive plate is arranged is conceivable. That is, in the same figure, 3 is the radiating element conductor, 4 is the ground conductor, 5 is the feed pin, 6 is the feed line conductor (tri-plate line center conductor), 7 is the microwave strip antenna, and 8 is the tri-fv-to-line. . In this case, as a method of feeding power to each radiating element 3, it is necessary to solder the feeding pin 5 as shown in the figure or to connect it with a through hole. When increasing the number of antennas and increasing the diameter of the antenna, there was a problem with productivity.

[Purpose of the invention This invention was made in view of the above-mentioned circumstances,
The purpose of the present invention is to provide a microwave strip antenna that has a simple configuration while using a multilayer printed circuit board and has excellent productivity without reducing the radiation efficiency of the antenna.

[Summary of the Invention] In the present invention, a two-layer printed circuit board is used, and excitation from a feed line system using a triplate line to a radiating element is performed by electromagnetic coupling.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows its basic configuration, in which the first to third conductor plates 11 to 13 are connected to the first to third conductor plates 11 to 13. A triplate line is formed with second insulating layers 14 and 15 interposed therebetween.

On the third conductor plate 13, which is the uppermost surface, radiating elements 16 are separated and patterned via annular slots 17.

The second
A tri-plate line center conductor 18 is disposed along the conductor plate 12. From the open end 19 of the tri-plate line center conductor 18, the annular slots 17 are electromagnetically coupled and power is supplied.

With the above configuration, its directivity and axial ratio characteristics are shown in FIGS. 2 and 3. All of them have almost the same characteristics as the coplanar microstrip array antenna shown in Figure 5, and the unnecessary radiation is at a sufficiently small level, so they can be arranged in a flat array for practical use. It is possible to stir.

Therefore, an example of the configuration of a four-element array antenna is actually shown in FIG. The figure shows an example of a boresight type arrangement, in which 512 elements, 1024 elements, etc.
By increasing the number of elements, it is possible to obtain a much wider frequency characteristic.

[Effects of the Invention] As described above, according to the present invention, a two-layer printed circuit board is used, and the excitation from the feed system to the radiating element by the triplate line is performed by electromagnetic coupling, which improves the radiation efficiency of the antenna. It is possible to provide a microwave strip antenna that has a simple configuration even though it uses a multilayer printed circuit board without sacrificing performance, has excellent productivity, and can be expanded to include multiple elements.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention.
Figure 1 is a plan view showing the element configuration;
Fig. 3 shows the frequency characteristics of the axial ratio, Fig. 4 shows an example of the configuration of a four-element array antenna, Figs. 5 and 6 show conventional microwave strip antennas, and Fig. is a diagram showing the pattern of a coplanar type 1s twin antenna, Figure 6 (■) is a plan view showing the element configuration of a triplate type planar antenna, and Figure 6 (B) is a diagram along the line ■-■ of the same figure. FIG. 1.3, 16... Radiation element conductor, 2... Feeding line system, 4... Earth conductor, 5... Feeding pin, 6.18
... Tri-rate line center conductor, 2... Microwave strip antenna, 8... Tri-plate line, 11
...first conductive plate, 12...second conductive plate, 13.
...Third conductive plate, 14...First insulating layer, 15...
・Second insulation no, 17... Annular slot, 19...
・Open end. Applicant's agent Patent attorney Takehikowara Leadworker 1 Figure No. 3 +v+ (W'/+=WY2, WY= 2 people., 2h/λ, =
0.016) Figure 2 Figure 4 Figure 5 Figure 6, Indication of the case Japanese Patent Application No. 1983-296783, Name of the invention Microwave strip antenna, Person making the amendment Relationship to the case Patent applicant (1381) Yagi Antenna Co., Ltd. 4, Agent 3-7-2 Kasumigaseki, Chiyoda-ku, Tokyo 100 Telephone 03 (502) 3181 (Main representative) 7. Contents of amendment (1) Amend the scope of the patent claims as shown in the attached sheet. . (2) Insert the following paragraph between "Page 5, line 3 and line 4 of the specification". The above-mentioned invention was explained using a two-layer structure board as an example, but in order to further facilitate manufacturing and reduce costs, the first and second components of the two-layer structure board were
By applying the necessary processing to the second and third conductor plates and the first, second and third insulating layers as separate materials and laminating them after processing, the same effect as a two-layer structure board can be achieved. It can also have an effect. The following table shows the correspondence between the configuration shown above and the first and second claims of the claims. With the above configuration, the feed distribution circuit and the radiating element section consisting of the triplate line are each formed into a pattern using a film substrate, and are further constructed from a metal plate with a thickness of 1 to 2 nm in order to maintain the strength as an earth antenna. death,
After individually performing various machining processes such as the power supply connector mounting hole, cover mounting hole, metal fitting mounting hole, etc., the patterned film substrates are laminated and assembled with a foam sheet of a predetermined thickness interposed between them. By doing so, the desired performance can be obtained. As a result, it excels in mass production, and since various materials are commonly available on the market and are inexpensive, it is possible to reduce costs.1. An inexpensive and highly productive antenna can be provided. 2. Claims (1) A first insulating layer, first and second conductive plates laminated on both sides of the first insulating layer, and a first insulating layer of the second conductive plate. A double structure print consisting of a second insulating layer adhesively fixed on the opposite side of the second insulating layer, and a third conductive plate laminated on the opposite side of the second insulating layer to the second conductive plate. In a microwave strip antenna having a substrate, the first conductor plate is used as a ground conductor, the second conductor plate is used as a feed line conductor, and the third conductor plate is used as a radiating element conductor consisting of an annular slot, and the above-mentioned A microwave strip antenna characterized by excitation from the feed line conductor to the radiating element conductor through electromagnetic coupling between the annular slot and the open end of the feed line conductor.

Claims (1)

[Claims] A first insulating layer, first and second conductive plates laminated on both sides of the first insulating layer, and the second conductive plate opposite to the first insulating layer. A microcontroller having a double structure printed circuit board consisting of a second insulating layer adhesively fixed to one side, and a third conductive plate laminated on the opposite side of the second insulating layer to the second conductive plate. In the wave strip antenna, the first conductor plate is used as a ground conductor, the second conductor plate is used as a feed line conductor, and the third conductor plate is used as a radiating element conductor consisting of an annular slot, and the annular slot and the feed line are used. A microwave strip antenna characterized by excitation from a feed line conductor to a radiating element conductor through electromagnetic coupling with the open end of the conductor.