Hybrid forming large-axial-ratio elliptical beam antenna and design method thereof

Abstract

The invention, which belongs to the field of the satellite communication technology, discloses a hybrid forming large-axial-ratio elliptical beam antenna and a design method thereof. The antenna comprises a main reflection surface and an auxiliary reflection surface; the main reflection surface consists of a first outer ring part and a first inner ring part; the auxiliary reflection surface includes a second outer ring part and a second inner ring part; and the boundary line between the first outer ring part and the first inner ring part and the boundary line between the second outer ring part and the second inner ring part are elliptical ones. The first outer ring part and the second outer ring part form an elliptical forming cassegrain antenna structure; and the first inner ring part and the second inner ring part form an elliptical forming ring-focus antenna structure. The second outer ring part and the second inner ring part are in a first-order continuous mode at the boundary line. Therefore, defects of various forming elliptical beam antennas in the prior art can be overcome. The hybrid forming large-axial-ratio elliptical beam antenna has advantages of high efficiency, low sidelobe, low standing wave, low profile, and large axial ratio and the like and is designed based on improvement of the existing technologies.

Description

Technical field [0001] The invention relates to the technical field of satellite communication, in particular to a hybrid shaped large-axis ratio elliptical beam antenna and a design method thereof. Background technique [0002] In the field of satellite communications, shaped dual-reflector antenna technology is the mainstream direction of current research. This antenna can form an elliptical beam and has the characteristics of low profile and high efficiency. [0003] There are mainly four types of shaped dual-reflector antennas in the prior art: elliptical beam double-offset Gregory antenna, high-efficiency shaped double-offset elliptical beam antenna, elliptical beam zoom ring focus antenna, and elliptical beam Kafka antenna. The common point of these four antennas is the use of circularly symmetrical feeds, which is easy to process and low in cost, and the use of a special shaped secondary reflecting surface to convert the circular beam into an elliptical beam, without energy...

AI Technical Summary

Problems solved by technology

[0004] 1. The first two types of elliptical beam antennas with dual-bias structure avoid the shielding of the sub-reflector, resulting in an increase in the longitudinal and lateral dimensions of the antenna, which is not conducive to the realization of low profile and miniaturization and poor cross-polarization performance

[0005] 2. Although the variable focal length elliptical beam ring-focus antenna has the advantages of excellent standing wave and small feed source shielding, due to its special geometric structure, it can only achieve an elliptical beam with an axial ratio of 1.5:1.

[0006] 3. The shaped elliptical beam Cassegrain antenna can achieve a large axial ratio elliptical beam, but the feed source is blocked, which restricts the design of the feed source and reduces the reflection efficiency of the main reflector, restricting the improvement of antenna performance , and the standing wave performance is not good due to its geometry

Images