An extremely small frequency ratio single-feed dual circularly polarized directional antenna and antenna system

Abstract

The invention belongs to the technical field of antenna parts or antenna combination devices, and discloses a single-fed dual circularly polarized directional antenna and an antenna system with a minimum frequency ratio, which are provided with a rectangular microstrip. The microstrip is printed on the dielectric substrate by the printed circuit process; the stub, located on the uppermost layer of the antenna, is printed on the dielectric substrate by the printed circuit process; the metal through hole is arranged above the stub and installed along the center symmetrical position There are two: a dielectric substrate, which is located in the middle layer of the antenna; and a metal bottom plate, which is located in the lower layer of the dielectric substrate, and the metal bottom plate is installed with radio frequency connectors. It solves the requirement of realizing the dual-frequency dual-circular polarization directional radiation characteristics with extremely small frequency ratio of the low-profile microstrip antenna under the traditional single feed. While ensuring the high performance of the antenna, the present invention can minimize the influence of the antenna on the shape of the carrier, reduce the number of input ports, and realize the above characteristics without switching different ports.

Description

technical field [0001] The invention belongs to the technical field of antenna components or antenna combination devices, and in particular relates to a single-fed dual circularly polarized directional antenna and an antenna system with an extremely small frequency ratio. Background technique [0002] At present, in modern wireless communication systems, dual circularly polarized directional antennas (taking into account the characteristics of left-handed and right-handed circular polarization) have the advantages of multi-frequency operation, avoiding polarization loss and suppressing multipath scattering and multipath interference. more and more attention. The microstrip patch antenna has the advantages of low cost, light weight and easy conformality, so the research on the dual-frequency circularly polarized microstrip antenna is imperative. [0003] However, conventional dual-frequency circularly polarized microstrip patch antennas, especially orthogonally polarized cir...

AI Technical Summary

Problems solved by technology

[0005] (1) The existing method increases the thickness of the antenna, which destroys the inherent low-profile characteristics of the microstrip antenna, and it requires dual-port feeding

[0006] (2) Existing methods cannot achieve a minimum frequency ratio of 1.04

[0008] (1) Reducing the profile of the antenna will narrow the frequency band of the antenna, make it difficult to obtain dual-frequency characteristics, and increase the frequency ratio of the antenna; the antenna with single-port feed has a lower radiation ability than the antenna with dual-feed , it is not easy to achieve good performance

[0009] (2) There is no effective way to realize the extremely small frequency ratio of the dual-frequency circularly polarized microstrip antenna

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