Low-profile omnidirectional circularly polarized antenna with wide axial-ratio beam on pitching surface

Abstract

The invention relates to an omnidirectional circularly polarized antenna, in particular to a low-profile omnidirectional circularly polarized antenna with a wide axial-ratio beam on a pitching surface. The low-profile omnidirectional circularly polarized antenna comprises a dielectric substrate, a round monopole radiator and a hexagonal radiator, wherein the round monopole radiator is arranged in the center of the antenna and comprises an upper-layer round metal patch and a lower-layer round metal patch, the upper-layer round metal patch and the lower-layer round metal patch are right opposite to each other and are surface-mounted at two sides of the dielectric substrate, six metal patch short-circuit via holes are formed between the upper-layer round metal patch and the lower-layer round metal patch in a penetrating way, dual-L shaped gaps are formed in two edges of the via holes, the hexagonal radiator is arranged around the round monopole radiator and comprises an upper layer and a lower layer, the upper layer and the lower layer are surface-mounted at the two sides of the dielectric substrate, each layer comprises six groups of S-shaped matching transmission lines, a rectangular metal patch and a round metal sheet, and the hexagonal radiator penetrates through the dual-L shaped gaps and are connected with the via holes of the round monopole radiator. By the low-profile omnidirectional circularly polarized antenna, the problems of narrow 3dB axial-ratio beam and large volume of an existing circularly polarized antenna are solved. The low-profile omnidirectional circularly polarized antenna is suitable for wireless communication.

Description

Technical field [0001] The invention relates to an omnidirectional circularly polarized antenna, in particular to a low-profile omnidirectional circularly polarized antenna with a wide-axis ratio beam on the elevation plane. Background technique [0002] Circularly polarized antennas are widely used in radar, electronic countermeasures, satellite communications and other fields because of their advantages of suppressing rain and fog and anti-multipath reflection. In mobile communications, the use of omnidirectional circularly polarized antennas can achieve better radiation characteristics within a 360° horizontal plane, expand the coverage of antenna sectors, and reduce the number of base station antennas. [0003] At present, a lot of research has been done on omnidirectional circularly polarized antennas at home and abroad, and a variety of omnidirectional circularly polarized antennas have appeared. In 2013, Wei Wei Li and others published "Omnidirectional Circularly Polarized ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of narrow 3dB axial ratio beam and large volume of existing circularly polarized antennas, the present invention provides a low-profile omnidirectional circularly polarized antenna with a wide axial ratio beam on the elevation plane

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