Dual-port dual-frequency dual-circular polarized micro-strip array antenna

Abstract

The invention discloses a dual-port dual-frequency dual-circular polarized micro-strip array antenna, comprising a dielectric substrate (1), four dual-frequency shared radiation patches (21, 22, 23, 24) arranged on the upper surface of the dielectric substrate (1), a first feeding port (3) and a second feeding port (4), wherein a first-frequency output end of the four radiation patches (21, 22, 23, 24) is connected with the first feeding port (3) through a series-feed power division network (5), and a second-frequency output end of the four radiation patches (21, 22, 23, 24) is connected with the second feeding port (4) through a parallel-feed power division network (6). The dual-port dual-frequency dual-circular polarized micro-strip array antenna disclosed by the invention is simple in structure with a low section plane, good in bandwidth and low in cross polarization, can be expanded into a large-scale array conveniently, and has unique advantages for dual-circular polarization application of two frequency points with close frequencies, and the two ports have good isolation.

Description

technical field [0001] The invention belongs to the technical field of satellite antennas, in particular to a dual-port dual-frequency dual-circular polarization microstrip array antenna with simple structure, low profile, wide bandwidth, low cross polarization and good isolation. Background technique [0002] Because of its small size, light weight, low cost, and easy integration, microstrip antennas have become an important branch of the antenna field. Circularly polarized antennas can receive arbitrary polarized waves and have strong anti-interference performance, and are more and more widely used in satellite and communication systems. Circularly polarized microstrip antennas have the advantages of both, and have broad application prospects. [0003] The conventional circularly polarized microstrip antenna is a high-Q resonant antenna with a narrow operating frequency band. The methods to widen the circular polarization bandwidth mainly include: using broadband microst...

AI Technical Summary

Problems solved by technology

A simple method is to implement it through a reflector antenna and a feed horn, but this antenna has a high profile and is not easy to integrate with the system; and a general microstrip antenna can also achieve dual-frequency dual-circular polarization by stacking multi-layer structures. However, this kind of antenna has complex structure, difficult processing and high cost

The "single-layer dual-frequency circularly polarized microstrip array antenna" disclosed by the Chinese patent (application number: 201410649033.9, publication date: 2015.2.4) passes the working frequency f 1 , f 2 The two circularly polarized radiation patches are respectively connected to a section of microstrip line, and the two sections of microstrip line are connected at one point. By setting the position of the connection point, the two patches can work normally at their respective frequencies without affecting each other. However, This method operates at two operating frequencies f 1 , f 2 closer together (ie f 2 / f 1 When it is close to 1), it cannot be isolated, and it is difficult to achieve dual frequency and dual circular polarization performance

[0005] Therefore, there are problems in the existing technology: the dual-frequency dual-circular polarization antenna has a high profile, narrow frequency band, multi-layer complex structure, and it is difficult to realize dual-frequency dual circular polarization on two operating frequencies that are close together

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