A nested dual-band dual-circular polarization feed

Abstract

The invention discloses a nested dual-band dual-circular polarization feed source, which comprises: a waveguide radiator in the high-frequency band, a screw-adjusted circular polarizer in the high-frequency band, a waveguide orthogonal mode, and a printed circular ring radiation in the low-frequency band. device, printed arc exciter and printed circular polarization forming network. Its characteristics are: the waveguide radiator in the high frequency band is nested in the ring radiator in the low frequency band, the waveguide radiator in the high frequency band is connected with the circular polarizer and the orthogonal mode to form a circular polarization radiation unit in the high frequency band, and the low The ring radiator of the frequency band is fed through the coupling and feeding of the circular exciter. The arc exciter is connected to the printed circular polarization forming network. The feed source can work in two frequency bands at the same time, can realize the conversion of dual circular polarization, has approximately the same pattern in the two frequency bands, and has approximately the same phase center.

Description

technical field [0001] The invention relates to a feed source. Specifically, it is a nested, dual-band, dual circularly polarized parabolic reflector antenna feed. Background technique [0002] The feed source is the heart of the reflector antenna, and the quality of the feed source directly determines the performance of the parabolic reflector antenna. For a dual-frequency parabolic reflector antenna, it is undoubtedly necessary that the feeds of the two frequency bands have the same phase center and have approximately the same pattern, so that the parabolic reflector antenna can obtain good performance in the two frequency bands. Such as high efficiency, high gain, low side lobe and other characteristics. Although some dual-band microstrip antennas or broadband antennas have dual-band or broadband (can cover dual-band) characteristics, and can be used as feed sources for parabolic reflector antennas after improvement, many feed sources composed of dual-band microstrip an...

AI Technical Summary

Problems solved by technology

Although some dual-frequency microstrip antennas or broadband antennas have dual-frequency or broadband (can cover dual-frequency) characteristics, and can be used as feed sources for parabolic reflector antennas after improvement, many feed sources composed of dual-frequency microstrip antennas or broadband antennas do not Has a uniform phase center, and the phase center will change around or along the axis as the frequency changes

At the same time, the pattern changes significantly with frequency, and it is difficult to obtain approximately the same pattern in the two frequency bands at the same time, resulting in low antenna efficiency

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