Dual-band wave beam equalization side-fed offset cassegrain antenna and realization method thereof

Abstract

The invention relates to a dual-band wave beam equalization side-fed offset cassegrain antenna and a realization method thereof. The antenna comprises four pairs of standard side-fed offset cassegrain antennas and each pair of antenna comprises a primary reflector, a secondary reflector and a feed source assembly, wherein the four pairs of the standard side-fed offset cassegrain antennas are in a standard form and are used for receiving and transmitting; each feed source assembly is formed by a plurality of sample strip forming light wall loudspeaker feed sources; each sample strip forming light wall loudspeaker feed source is formed by sequentially connecting a sample strip forming light wall loudspeaker, a square and circle transition, a circular polarizer, a square and square transition and an orthogonal mould coupler; a main lobe of a low-frequency emission directional diagram and a first lateral lobe of a high-frequency receiving directional diagram irradiate the reflectors; and a phase center of each feed source assembly is located on focus planes of the reflectors and points at the center of an equivalent reflection face. According to the dual-band wave beam equalization side-fed offset cassegrain antenna and the realization method thereof disclosed by the invention, an antenna receiving-transmitting directional diagram has the equal beam width; and the dual-band wave beam equalization side-fed offset cassegrain antenna has the advantages of simple structure, portability, easiness for designing, good performance, strong practical applicability and the like, and has the good same frequency interference resistance.

Description

technical field [0001] The invention relates to a dual-band beam equalization side-feed offset Cassegrain antenna and a realization method thereof, belonging to the technical field of antennas. Background technique [0002] With the rapid growth of demand for satellite broadband multimedia services, the relatively idle Ka-band replaces C-band and Ku-band and becomes the preferred frequency band for high-definition TV and broadband multimedia two-way services all over the world, especially in Europe and the United States. At present, most Ka-band broadband multimedia communication satellites use high-gain multi-beam antennas, and adopt multi-color multiplexing to achieve large capacity and wide coverage. In addition, in order to obtain high-efficiency transmission, multi-beam antennas are required to have low sidelobe characteristics to reduce interference between beams of the same frequency. [0003] Space-borne high-gain low-sidelobe multi-beam antennas mainly include dire...

AI Technical Summary

Problems solved by technology

The former has larger mass and volume, and the structure is more complicated; the latter reflector is more difficult to process

[0005] Due to the limitations of the existing satellite platform, there are strict requirements on the envelope size and structural characteristics of the antenna, so it is difficult to meet the requirements of the multi-beam antenna with separate transmission and reception; and the current multi-beam transmission and reception using dichroic materials and stepped circular reflectors Antennas, whose reflector processing technology is complex, and the electrical performance of the antenna deteriorates sharply under the condition of thermal deformation, so it is difficult to meet the requirements

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