Simple dual-frequency dual-circularly-polarized parabolic reflector antenna feed source

Abstract

The invention discloses a simple dual-frequency dual-circularly-polarized parabolic reflector antenna feed source, which comprises a circular radiation patch which is fed by eight L-shaped probes. The simple dual-frequency dual-circularly-polarized parabolic reflector antenna feed source is characterized in that the eight L-shaped probes are equiangularly distributed around the circumference, the feed probes of frequency 1 and the feed probes of frequency 2 are distributed in a staggered way, wherein the distances of four of the feed probes from the centerlines of the vertical parts to the center of the radiation disc are changeable with frequency, i.e. when the frequency is high, the centerlines of the vertical parts of the probes are close to the center of the radiation disc and the radiation area is correspondingly reduced, and when the frequency is low, the centerlines are far away from the center of the radiation disc and the radiation area is correspondingly increased; and therefore approximately consistent directional diagrams are obtained within frequency bands, the two frequency bands have approximately consistent phase centers and wider working frequency bands are obtained within the two frequency bands. The feed source can work in a dual-circularly-polarized way within the two frequency bands at the same etime, the cross section is small, the structure is simple, the cost is low, the parabolic reflector antenna can be enabled to have high antenna efficiency and low side-lobe level within the two frequency bands and the two frequency bands can be enabled to have the advantages of better frequency band isolation performance, good polarization isolation performance and the like.

Description

technical field [0001] The invention relates to a feed source. Specifically, it is a simple, dual-frequency, 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 microstr...

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

Some dual-band feeds realized by nesting two feeds are generally difficult to obtain an approximately consistent pattern when the frequency ratio is relatively small

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