Compact type broadband bicircular polarization patch antenna based on coupling microstrip line coupler

Abstract

A compact type broadband bicircular polarization patch antenna based on a 3 dB coupling microstrip line coupler adopts a printed circuit board technology to arrange a feed network, a ground plane and capacitance coupling patches and a main radiation patch on the upper surfaces and the lower surfaces of two dielectric substrates from bottom to top, wherein the feed network is the 3 dB broadband coupling microstrip line coupler with a compact structure, so that the circular polarization orthogonal feed network with functions of power distribution and 90-degree phase shift is formed; and the two dielectric substrates are supported and fixed by upright columns and nuts made of a non-conducting material, and a gap is reserved between the two dielectric substrates to form air dielectrics. Two output ends of the feed network and the two capacitance coupling patches are connected together through two feed probes, and the orthogonal feed is performed on the main radiation patch through the mode of combining the metal probes and the capacitance coupling patches, and accordingly, circular polarization radiation with high gain, low axial ratio and broadband is achieved. The antenna achieves miniaturization of the broadband circular polarization patch, is simple in structure and low in cost, and facilitates popularization and application.

Description

technical field [0001] The present invention relates to a kind of wireless communication antenna, to be exact, relates to a kind of using 3dB coupled microstrip line coupler as compact power distribution and 90 degree phase-shifting quadrature feeding network, based on air medium and using feeding probe The method of combining with the capacitive patch feeds the circular main radiation patch to realize the compact broadband dual circularly polarized radiation antenna, which belongs to the technical field of the dual circularly polarized antenna. Background technique [0002] In recent years, with the rapid development and wide application of satellite navigation, communications and the Internet of Things, circularly polarized antennas are used as the front-end equipment of these systems. play an extremely important role. In addition, in order to facilitate the large-scale popularization and application of satellite communication terminals and radio frequency identification ...

AI Technical Summary

Problems solved by technology

Now, the 3dB branch line coupler is often used as the power distribution and phase-shifting feed network of dual-feed dual circularly polarized antennas, but this structure has some shortcomings: first, because of its structure is not compact enough, the circuit The large area is not conducive to the low cost and miniaturization of the antenna; in addition, the theoretical value of its 1dB amplitude imbalance relative bandwidth is 27%, and the phase imbalance relative bandwidth of (90±5) degrees is only 33%

However, so far, in the literature or papers published at home and abroad, no relevant research and reports on the compact broadband dual circularly polarized antenna based on the 3dB coupled microstrip line coupler have been found.

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