Broadband circularly polarized patch antenna

Abstract

The invention discloses a broadband circularly polarized patch antenna, which comprises a dielectric substrate, a square metal patch element, a microstrip line, a plurality of folding coupling line groups, a three-dimensional metal floor and a plurality of metal via holes, the square metal patch element, the microstrip line and the folding coupling line group are all located on the surface of the dielectric substrate, the three-dimensional metal floor is located on the other surface of the dielectric substrate, the square metal patch element is connected with the microstrip line, the microstrip line is connected with the folding coupling line group, and the metal via hole penetrates through one end of the dielectric substrate and is connected with the folding coupling line group to form a parallel resonator. And the other end is connected with the three-dimensional metal floor. According to the invention, the parallel resonator structure formed by the metal via holes and the folding coupling line group is added, so that the purpose of expanding the broadband characteristic is achieved; meanwhile, parasitic radiation of the feed circuit is reduced in a mode that the microstrip line is directly connected with the antenna; and the antenna radiation unit and the feed circuit can be placed on the same surface of the dielectric substrate, so that processing and assembling are facilitated.

Description

technical field [0001] The invention belongs to the field of microwave communication, and in particular relates to a broadband circularly polarized patch antenna. Background technique [0002] Circularly polarized patch antennas are widely used in satellite communications and GPS positioning. With the continuous upgrading of wireless communication systems, new applications place higher and higher requirements on the performance of antennas in wireless communication systems. The operating bandwidth of circularly polarized antennas is getting wider and wider. More antenna elements need to be integrated in a smaller space, so the feed circuit of the antenna needs to reduce spurious radiation, so as to reduce the impact on the overall performance of the antenna. From the perspective of market products, printing the antenna unit and the feed circuit on the same dielectric substrate can reduce the cost of processing and assembly. [0003] Traditional broadband circularly polari...

AI Technical Summary

Problems solved by technology

However, the coupling structure in the feed circuit is prone to spurious radiation, affecting the radiation pattern of the antenna

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