Circularly polarized single-pulse Cassegrain antenna

Abstract

The present invention discloses a circularly polarized single-pulse Cassegrain antenna. The circularly polarized single-pulse Cassegrain antenna comprises a main reflection surface and an auxiliary reflection surface which are arranged coaxially, an assembly device connecting the main reflection surface and the auxiliary reflection surface, a feed source and a feed network. The feed source is an integrally formed circularly polarized single pulse feed source, the circularly polarized single pulse feed source comprises four same-structure circularly polarized feed units arranged in 2x2, and feed ports of the four circularly polarized feed units are all connected with the feed network. According to the circularly polarized single-pulse Cassegrain antenna provided by the present invention, the feed source is an integrally formed circularly polarized single pulse feed source, so that without stratified block-by-block processing, the feed source is applicable to various frequency bands, hasa simple structure, and has the characteristics of the bandwidth and the axial ratio; and in addition, the size of the feed source can be made small, the circularly polarized feed units can be smaller than one wavelength, and compared with the prior art, the feed source has the characteristics of miniaturization, can be used for various antennas, and has strong adaptability.

Description

technical field [0001] The invention relates to the field of antennas, in particular to a circularly polarized monopulse Cassegrain antenna. Background technique [0002] Since the development of monopulse radar technology in World War II, monopulse antennas have played an important role in radar systems. In radar applications, the monopulse antenna can generally be an array antenna, or it can be composed of a reflector and a monopulse feed. Among them, the reflective monopulse antenna has the characteristics of simple structure and high gain, and has been widely used. [0003] Reflective monopulse antennas can be divided into linear polarization, circular polarization, multi-polarization and other forms in terms of polarization characteristics. Among them, circular polarization has great advantages, because circular polarization can be decomposed into two equal Amplitude and phase difference of 90 degrees of linearly polarized waves, so circularly polarized antennas can ac...

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Problems solved by technology

Reflective circularly polarized monopulse feeds are mostly selected as horn antennas, while traditional circularly polarized horn feeds are long and bulky, and sometimes need to be loaded with a medium or diaphragm, and sometimes need to be processed in layers and blocks, especially in In the millimeter wave frequency band, the loading medium or layered block processing is not only bulky and difficult to assemble, but also increases the antenna error during the assembly process, thereby reducing the overall performance of the antenna, and high-performance antennas generally require antennas to have a wider bandwidth. , so there is a need for a circularly polarized single-pulse reflector antenna with broadband characteristics and a simple structure that is easy to process

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