JPH02272901A - Circularly polarized wave generator for microwave band primary radiator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a circularly polarized wave generator for a microwave band primary radiator used, for example, in a receiving antenna for satellite broadcasting or satellite communications.

[Prior Art] Conventionally, a circularly polarized wave generator installed in the primary radiator of a microwave band receiving antenna for satellite broadcasting, satellite communication, etc.
The structure was as shown in the figure.

In the figure, 11 is a primary radiator, 12 is a circularly polarized wave generator made of a dielectric plate disposed in the feeding waveguide section of the primary radiator 11,
13 is a dielectric cover attached to the opening of the primary radiator 11, 14 is an annular fixed lid for attaching and fixing the dielectric cover 13 to the opening of the primary radiator 11, and 15 is the primary radiator 11 not shown. This is a flange for attaching to the antenna body.

Dielectric cover 13 attached to the opening of primary radiator 11
is thin, with a wall thickness of about 0.3 mm to 1.0 am, and between the circularly polarized wave generator 12 disposed in the feeding waveguide section of the primary radiator 11 and the dielectric cover 13. There is an interval of approximately 20mflI to 30m11.

[Problems to be Solved by the Invention] However, as described above, the dielectric cover 13 is thin and its periphery is only fixed to the opening of the primary radiator 11 by the fixed lid 14, so vibrations occur. It is vulnerable to shocks and shocks, and may crack or break.

Further, the circularly polarized wave generator 12 is arranged in the waveguide section of the primary radiator 11, and there is no opening between the circularly polarized wave generator 12 and the dielectric cover 13, that is, the primary radiator 11. Since the waveguide section of the primary radiator 11 had to be designed to have a long length for the circularly polarized wave generator 12, which is a space and requires a specific volume, the primary radiation Vessel 1
There was a drawback that the overall length of 1 was inevitably long.

The present invention has been made in view of the above-mentioned circumstances, and provides a microwave band primary radiation that increases the strength of the dielectric cover, prevents cracks and damage, and allows the primary radiator to be sufficiently miniaturized. The purpose is to provide a dexterous circularly polarized wave generator.

[Means and effects for solving the problems] The present invention provides a circularly polarized wave generator in which both end portions are joined together along the axial direction of the inner wall of the primary radiator, and the front end is made of a dielectric material. A dielectric plate is used that is in contact with the cover, and the dielectric plate may be molded integrally with the dielectric cover, or the abutting portion of the dielectric cover and the front end of the dielectric plate may be molded integrally with the dielectric cover. Since a concave part and a convex part are formed respectively, and the installation is fixed by fitting these parts, the strength of the dielectric cover is increased and cracks and damage can be prevented. It also becomes possible to make the radiator sufficiently compact.

[Example] The present invention will be described in detail below with reference to the drawings.

1 and 2 show a cross-sectional structure of one embodiment, with FIG. 1 showing the longitudinal direction and FIG. 2 showing the cross-section of the primary radiator opening. In the figure, 21 is a primary radiator, and 22 is a primary radiator 21 whose both ends are part of the inside of the primary radiator 21.
A circularly polarized wave generator consisting of a dielectric plate fitted along the axial direction of the inner wall; a dielectric cover 24 attached to the opening of the primary radiator 21; an annular fixed lid for attaching and fixing to the opening of 2;
5 is a flange for attaching the primary radiator 21 to the antenna body (not shown).

The circularly polarized wave generator 22 is disposed with its front end (upper end in the figure) in contact with a dielectric cover 23 as shown in FIG. body cover 23
A portion corresponding to its diameter is abutted and supported by the circularly polarized wave generator 22 from inside the primary radiator 21, increasing its mechanical strength. That is, the dielectric cover 23 itself is made of synthetic resin such as polyethylene and has a thickness of 0.
．． Although it is a thin plate with a thickness of about 3 mm to 1, On+Im, when it is supported by the dielectric cover 23, it becomes a structure equivalent to one with ribs added, increasing its strength and preventing damage. be. In addition, circularly polarized wave generator 2
2 has its one end abutted against the dielectric cover 23, and not only supports it, but also conforms to the shape of the inside of the primary radiator 11 so that its both ends are aligned along the axial direction of the inner wall of the primary radiator 21. Since the primary radiator 21 is fitted in this state, there is no wasted space within the primary radiator 21, and the entire primary radiator 2 can be made small and lightweight.

The following FIGS. 3 to 5 all show other embodiments of the present invention, and the primary radiator, fixed lid, and flange of the primary radiator are similar to those shown in FIGS. 1 and 2. Since it is a structure, its description will be omitted, and only the structure of the circularly polarized wave generator and the dielectric cover will be described.

FIG. 3 shows the structure of a dielectric cover/circularly polarized wave generator 2G in which a circularly polarized wave generator and a dielectric cover are integrally molded, from the side. In this case, by integrally molding the circularly polarized wave generator 22 and the dielectric cover 23 in FIGS. 1 and 2 above, the strength of support and fixation between the dielectric covers is increased, and the It is possible to simplify the assembly process and reduce manufacturing costs.

FIG. 4 shows a configuration in which a concave portion 27a and a convex portion 28a are formed at the abutting portions of the dielectric cover 27 and the circularly polarized wave generator 28, respectively, and these are fitted to secure the mounting. In this case, the concave portion 27a and the convex portion 28a are formed along the diameter direction of the dielectric cover 27, that is, along the side direction of the front end of the circularly polarized wave generator 2B.
You will be able to see its shape when viewed from the side.

The following FIG. 5 shows a convex portion 29a and a concave portion 3 at the abutting portions of the dielectric cover 29 and the circularly polarized wave generator 30, respectively, as in FIG. 4 above.
0a, and these are fitted to fix the installation. In this case, the convex portion 29a and the concave portion 30a
is formed in a direction perpendicular to the circularly polarized wave generator 30 at the center of the dielectric cover 29, and as shown in the figure, the circularly polarized wave generator 28
You will be able to see its shape when viewed from the front.

[Effects of the Invention] As detailed above, according to the present invention, as a circularly polarized wave generator, both end portions are fitted along the axial direction of the inner wall of the primary radiator, and the front end is fitted with a dielectric material. A dielectric plate is used that is in contact with the cover, and the dielectric plate may be molded integrally with the dielectric cover, or the abutting portion of the dielectric cover and the front end of the dielectric plate may be molded integrally with the dielectric cover. Since a concave part and a convex part are formed respectively, and the installation is fixed by fitting these parts, the strength of the dielectric cover is increased and cracks and damage can be prevented. It is possible to provide a circularly polarized wave generator for a microwave band primary radiator, which allows the radiator to be sufficiently miniaturized.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing the structure of one embodiment of the present invention, Fig. 2
The figure is a cross-sectional view showing the opening structure along the line ■-■ in FIG. 1, FIGS. FIG. 2 is a longitudinal cross-sectional view showing the structure of a conventional microwave band primary radiator. 11, ・21...Primary radiator, 12.22.28.3
0...Circular polarization generator, 13.23.27.29...
Dielectric cover 14, 24... fixed lid, 15.25...
・Flange, 26...Circularly polarized wave generator that also serves as a dielectric cover. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 4 Figure 3 Figure 5

Claims (3)

[Claims] (1) It is installed in a microwave band primary radiator that has a dielectric cover in its opening, and both ends are fitted along the axial direction of the inner wall of the primary radiator, and its front end is A circularly polarized wave generator for a microwave band primary radiator, comprising a dielectric plate in contact with the dielectric cover. (2) The circularly polarized wave generator for a microwave band primary radiator according to claim (1), wherein the dielectric plate is molded integrally with the dielectric cover. (3) The microwave according to claim (1), wherein a concave portion and a convex portion are respectively formed in the abutment portion of the dielectric cover and the front end of the dielectric plate, and these are fitted and fixed. Circularly polarized wave generator for band primary radiator.