JPS60203003A - Oval corrugation horn containing dielectric substance - Google Patents

Abstract

PURPOSE:To increase the degree of freedom for space of installation between a corrugation horn and another feed horn by burying a dielectric substance having a specific dielectric constant larger than 1 into a corrugation groove at the side of a short axis in order to decrease effectively the depth of said corrugation groove. CONSTITUTION:A dielectric substance 10 having a specific dielectric constant larger than ''1'' is buried into a corrugation groove 9 at the side of a short axis 6. Here the specific dielectric constant is referred to as epsilon and therefore the depth (t) of the groove 9 can be set effectively at t/epsilon<1/2> owing to the presence of the substance 10. In other words, the depth (t) can be reduced effectively. This reduces the minimum space with another feed horn and can increase the degree of freedom for space of installation of a corrugation horn.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a dielectric-loaded elliptical corrugated horn suitable for the primary radiator of an elliptical aperture parabolic reflector antenna. In particular, the present invention relates to an elliptical corrugated horn that is used together with other feed horns as a main feed horn for a multi-feed horn type satellite, and has increased flexibility in placement spacing with other feed horns.

[Description of prior art]

FIG. 1 is a perspective view of a reflector antenna to which an elliptical corrugated horn is applied. In FIG. 1, ■ is a multi-feed horn section, and 2 is a reflecting mirror.

FIG. 2 is a front view of the multi-feed horn section shown in FIG. 1. In Fig. 2, 3 is an elliptical corrugated horn;
4 is another feed horn, l is oval corrugated bone 3
and the other feed horns 4.

The elliptical corrugated horn 3 is conventionally used as a primary radiator of an elliptical aperture parabolic reflector antenna mounted on a satellite, and as a main feedbone of a multi-feed horn system together with another feed horn 4.

For example, when irradiating Japan from a geostationary satellite orbit, if the elliptical corrugated horn 3 is used for mainland Japan, Okinawa, and the Nansei Islands, and the other feed horn 4 is used for the Ogasawara Islands, the Each feed horn must be placed as shown in the diagram.

If the spacing between these feed horns is narrow,
The irradiation beams on each ground approach each other, and if the arrangement interval is wide, the irradiation beams on each ground spread. This minimum arrangement interval l is determined by the depth of the corrugation groove on the short axis side near the opening of the elliptical corrugated horn 3 and the thickness of the tube wall of each horn. Therefore, the smaller the depth of the corrugation groove of the elliptical corrugated horn 3 and the thickness of the tube wall of each horn, the narrower the minimum arrangement interval l, but the thickness of the tube wall should be set so that it has sufficient structural strength. There is little freedom to be determined. Therefore, the minimum spacing is adjusted by decreasing the depth of the corrugation grooves. The elliptical corrugated bone 3 normally has the following conditions: the E-plane radiated electric field and the H-plane radiated electric field are equal when excited in the long axis direction, and the E-plane radiated electric field and H when excited in the short-axis direction.
Since it is used under the condition that the radiation electric field is equal, that is, the halide hybrid condition, it is determined by the depth of the corrugation groove that satisfies that condition. Under optimal conditions, the grooves on the short axis side are deeper than the grooves on the long axis side, but the depth is generally in the range of 1/4 to 172 of the wavelength λ used. As described above, the minimum arrangement interval l is determined by the depth of the short axis side corrugation groove. Therefore, when configuring a multi-feed bone system using conventional elliptical corrugated bones, there was a drawback that the degree of freedom in arrangement spacing was small.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks and provides a dielectric-loaded elliptical corrugate which has a large degree of freedom in arrangement spacing with other feed horns when placed in close proximity with other feed horns as the main feed horn of a multi-feed horn system. The purpose is to provide horns.

[Features of the invention]

The present invention is an elliptical corrugated horn in which circumferential corrugation grooves are provided on the inner wall of the elliptical conical horn, characterized in that a dielectric material having a relative dielectric constant of greater than 1 is embedded in the corrugation grooves on the short axis side.

The corrugation groove portion on the short axis side in which the dielectric is embedded may be only near the opening, or may be the entire portion from the opening to the mouth. One example of a dielectric is polytetrafluoroethylene (dielectric constant about 2), another example is ceramic (dielectric constant 7-9).

[Explanation based on examples]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a front view of a dielectric-loaded elliptical corrugated horn according to an embodiment of the present invention. In Fig. 3, 3' is a dielectric-loaded elliptical corrugated horn, 5 is a long axis, 6 is a short axis, 7 is an opening, 8 is a mouth part, and 9 is a corrugation provided in a continuous step-like manner on the inner wall of the horn. Groove, 10 (shaded part) is short axis 6
This is a dielectric material embedded within the side corrugation a9.

FIG. 4 is a sectional view on the long axis side of the dielectric-loaded elliptical corrugated horn of the present invention, in which the dielectric 10 is embedded in the corrugation groove 9 from the opening 7 to the mouth 8 of the short axis 6 (ijll). It is.

FIG. 5 is a partially enlarged cross-sectional view on the short axis side of the dielectric-loaded elliptical corrugated horn of the present invention, in which the dielectric 10 is embedded in the corrugation grooves from the opening 7 to the fourth stage on the short axis 6 side. It is.

In FIGS. 4 and 5, the same parts as in FIG. 3 are indicated by reference numerals. In FIG. 5, t indicates the depth of the corrugation groove.

When operating a dielectric-loaded elliptical corrugated horn with such a configuration, the conditions under which the E-plane radiated electric field and the H-plane radiated electric field are equal when excited in the 1111.5 direction of the long axis of the ellipse and in the direction of the short axis 6 are usually required. It is used under the condition that the E-plane radiated electric field and the H-plane radiated electric field when excited are equal to each other. This condition is called the balanced tono/hybrid condition, and the depth t of the corrugation groove that satisfies this condition is 1/4 λ≦t≦1/2 λ (where λ is the wavelength used). The depth t of this corrugation groove is the long axis 5 of the ellipse.
The depth t of the corrugation groove on the short axis 6 side is deeper than that on the long axis 5 side.

The difference in the depth t of the corrugation grooves increases as the eccentricity e of the ellipse increases. Therefore, when using the multi-feed bone section 1 as the primary radiator of the reflector antenna as shown in FIG. The smaller the value, the greater the degree of freedom in arranging each beam. This degree of freedom can be increased by embedding a dielectric material 10 in the corrugation groove 9, as shown in FIGS. 3 and 4. That is, if the dielectric constant of the dielectric is ε, by embedding the dielectric 10, the depth t of the corrugation groove can be effectively reduced to t.
/1/T, and the minimum arrangement interval l becomes small. In this case, as shown in Fig. 5, 4 to 5
By filling the short axis 6 side of the corrugation groove 9 portion up to the step with the dielectric material 10, the degree of freedom is sufficiently increased and the balanced hybrid condition is satisfied. As shown in FIG. 4, it is also possible to expand the range in which the dielectric IO is filled from the opening 7 to the one element 8. As the dielectric material, for example, polytetrafluoroethylene (relative permittivity: 2) is used, and ceramic (relative permittivity: 7 to 9) is more effective.

〔Effect of the invention〕

As explained above, the present invention effectively reduces the depth of the corrugation groove by embedding a dielectric material in the corrugation groove on the short axis side of the elliptical corrugated horn, and reduces the spacing between the corrugation groove and other feed bones. This has the excellent effect of increasing the degree of freedom. Therefore, when UZ is arranged as a primary radiator of a reflector antenna together with other feed bones to form a multi-feed horn system, the advantage is that the range in which the irradiation beam interval can be controlled by the arrangement interval with other feed horns is expanded. be.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a reflector antenna to which an elliptical corrugated horn is applied. Figure 2 is a front view of the multi-feed horn section. FIG. 3 is a front view of a dielectric-loaded elliptical corrugated horn according to an embodiment of the present invention. FIG. 4 is a sectional view on the long axis side. FIG. 5 is a partially enlarged sectional view on the short axis side. l...Multi-feed horn section, 2...Reflector, 3
...Oval corrugate horn, 3'...Dielectric loaded oval corrugate horn, 4...Other feed horn, 5
...long axis, 6...short axis, 7...opening, 8...
Mouth part, 9... Corrugation groove, 10... Dielectric material, l... Minimum arrangement interval, t... Depth of corrugation groove. Patent applicant representative patent attorney Naotaka Ide 2 Enzuri 30 fever 40 1υ life 5 escape

Claims (3)

[Claims] (1) In an elliptical corrugated horn in which circumferential corrugation grooves are provided on the inner wall of the elliptical conical horn, a dielectric material characterized in that a dielectric material having a relative dielectric constant of greater than 1 is embedded in the corrugation groove on the short axis side. Loaded oval corrugated horn. (2) The electrically loaded elliptical corrugated horn according to claim (1), wherein a dielectric is embedded only near the opening in the corrugation groove on the short axis side. (3) A dielectric-loaded elliptical corrugated horn according to claim 11, wherein a dielectric is embedded from the opening in the corrugation groove to the mouth on the short axis side.