JPH0134422Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a circularly polarized wave generator for a circularly polarized antenna used in satellite communications and the like.

Conventional configuration and its problems Conventional microwave band circularly polarized antennas include a circularly polarized wave generator that converts linearly polarized waves into circularly polarized waves in a waveguide between the primary radiator and the transmitter/receiver. It is common to have For this reason, a circularly polarized wave generator is manufactured separately, adjusted, and inserted into the middle of the waveguide. These antennas were mainly used in industrial fields such as satellite communications, and there were no particular problems in terms of performance. However, in recent years, along with proposals for television broadcasting from satellites using the microwave band, there has been a demand for low-cost microwave circularly polarized antennas for consumer use.

For these reasons, conventional circularly polarized wave generators have been insufficient to meet the demand for low cost.

Purpose of the invention The present invention aims to provide a circularly polarized wave generator that is easy to manufacture and can be realized at low cost.

Structure of the invention This invention is a circularly polarized wave generator that has a structure in which a dielectric piece is placed inside a waveguide at an angle of 45 degrees with respect to the electric surface. One end of the dielectric piece is brought into contact with and fixed to an insulator.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on the drawings. In FIG. 1, a is a sectional view of a main part of the first embodiment of the present invention, and b is a sectional view taken along the line A-A' of a. In the figure, a dielectric piece 1 for generating circularly polarized waves is inserted into a circular waveguide 2 in which continuous electromagnetic waves exist, and inserted at an angle of 45 degrees to the electric surface E of linearly polarized waves. . One end 1a of the dielectric piece 1 contacts an insulator 5 fixed to the outer periphery of the opening 3 with screws 4a and 4b so as to cover the opening surface of the waveguide 2 where the discontinuous electromagnetic field exists. , fixed with adhesive. The aperture 3 widens in a tapered shape so as to have an aperture surface necessary to determine the directivity of the primary radiator. The other end 1b of the dielectric piece 1 has a wedge-shaped structure to reduce disturbance of the propagating electromagnetic field.

The above-described circularly polarized wave generator is constructed integrally with an aperture horn, and does not require a flange unlike conventional circularly polarized wave generators.

Furthermore, it is also possible to integrally mold the dielectric piece 1 and the insulator 5 from the same material. In this way, the number of parts can be reduced, the structure can be further simplified, and the present invention is further characterized. I can do it.

Figure 2 shows a second embodiment of the present invention;
1 is a sectional view of a main part, and FIG. In FIG. 2, elements shown with the same numbers as in FIG. 1 with a dot have the same functions as in FIG. 1. In the embodiment shown in FIG. 2, the dielectric piece 1' is inserted along a guide groove 6 formed on the inner circumference of the waveguide 2'. This guide groove 6 can be easily formed by machining. This allows the dielectric piece 1' to be more precisely 45mm relative to the electric surface.
Can be placed at a degree angle.

Effects of the invention As described above, the circularly polarized wave generator of the present invention can omit a special flange for mounting the circularly polarized wave generator, thereby reducing the number of parts.
In addition, because each part has a structure that is extremely easy to manufacture,
Compared to the conventional primary radiator with a circularly polarized wave generator, it is possible to realize a circularly polarized primary radiator that is significantly lower in price, and has good characteristics in areas where continuous and discontinuous electromagnetic fields straddle. It is something that demonstrates the.

[Brief explanation of the drawing]

Figures 1a and b are a cross-sectional view of a main part of one embodiment of the present invention and a cross-sectional view taken along line A-A', and Figures 2a and b are a cross-sectional view of a main part of another embodiment of the present invention and a cross-sectional view taken along line B-B. FIG. 1, 1'...Dielectric piece, 2, 2'... Waveguide,
3, 3'...opening, 5,5'...insulator, 6...
guide groove.

Claims (1)

[Claims for Utility Model Registration] (1) Inside a waveguide in which a continuous electromagnetic field exists, a dielectric piece is arranged at a 45 degree angle to the electric surface to form a 90 degree retardation plate. At the same time, while maintaining the width of the dielectric piece at a predetermined width, the end thereof was fixed by contacting with an insulator disposed in a horn-shaped opening where a discontinuous electromagnetic field exists at the tip of the waveguide. Circular polarization generator. (2) The circularly polarized wave generator according to claim 1, wherein the dielectric piece and the insulator are made of the same material and have an integrated structure. (3) The circularly polarized wave generator according to claim 1 or 2 of the utility model registration claim, characterized in that the conduit portion is provided with a guide groove for determining the arrangement angle of the dielectric piece. .