A Dual-frequency Circularly Polarized Monopole Antenna with Wide Axial Ratio Bandwidth

Abstract

The invention discloses a double-frequency circular polarization monopole antenna with a wide axial ratio bandwidth, which can be used for a global navigation satellite system (GNSS) and mobile communication. The antenna is composed of a radiator, a dielectric substrate and a metal floor; the radiator is composed of a high-frequency radiation unit and a low-frequency radiation unit, and is attached to the upper surface of the intermediate medium substrate, and feeds the radiator through a microstrip line; and the metal floor is located in the lower surface of the intermediate medium substrateand is in a shape of an isosceles right triangle, arrangement and excitation of a dual-frequency monopole are asymmetric with respect to a connecting ground plane of the metal floor, and the monopoleantenna and a beveling connecting ground plane of the metal floor respectively generate two orthogonal electric field vectors with equal amplitude and 90-degree phase difference in high and low frequency bands to achieve a right-handed circular polarization (RHCP) signal. Compared with previous antennas, the antenna of the invention is provided with a wider bandwidth in both lower and higher frequency bands.

Description

technical field [0001] The invention relates to the field of antenna research in the field of wireless mobile communication, in particular to a dual-frequency circularly polarized monopole antenna with a wide axial ratio bandwidth. Background technique [0002] Circularly polarized antennas have strong flexibility and adaptability to signal transmission and reception, and can reduce the impact of multipath effects on wireless signal transmission such as in Global Navigation Satellite System (GNSS) and Wireless Local Area Network (WLAN). Dual-band circularly polarized antennas can simultaneously realize circularly polarized radiation in two or more frequency bands, and meet the requirements of various communication systems, so they have attracted extensive attention from the academic community. [0003] Researchers have proposed many different types of dual-band circularly polarized antennas. It is mainly based on slots, patches, dipoles, etc., but generally has the defects ...

AI Technical Summary

Problems solved by technology

Mainly based on slots, patches, dipoles, etc., but generally have the defects of narrow bandwidth and large volume

However, there are still relatively few designs based on monopole structures to achieve dual-frequency circular polarization.

Images