A Circularly Polarized Microstrip Antenna with Wide Bandwidth and Axial Ratio Beam

Abstract

The invention provides a broadband wide-axis-ratio beam circularly polarized microstrip antenna. The antenna feeds a radiation patch through a broadband feed network to obtain broadband circular polarization characteristics. According to the antenna, the radiation patch is coupled with the parasitic unit and the metal column, and vertical current is introduced to the metal column so that the amplitude and the phase of a far-zone electric field component are changed, and a wide beam characteristic is obtained. The antenna bandwidth covers four common satellite navigation system working frequency points and can be applied to a multimode satellite navigation receiver.

Description

technical field [0001] The invention relates to a beam circularly polarized microstrip antenna with wide bandwidth and axial ratio, and belongs to the technical field of antennas. Background technique [0002] With the rapid development of major satellite navigation systems, navigation terminals not only need to be able to receive the signals of major navigation systems, but also to capture the satellite signals of a single satellite navigation system as much as possible, which requires the antenna to be able to achieve broadband, wide beam and other performance . Microstrip antenna has the advantages of small size, light weight, easy conformal, and easy to achieve circular polarization, so it has received extensive attention in the field of satellite navigation. The methods for expanding the bandwidth of microstrip antennas usually include adding parasitic elements, increasing the antenna profile, and using dielectric plates with high dielectric constants. Although these m...

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Problems solved by technology

The methods for expanding the bandwidth of microstrip antennas usually include adding parasitic elements, increasing the antenna profile, and using dielectric plates with high dielectric constants. Although these methods can achieve broadband characteristics, the antenna bandwidth cannot cover the four commonly used satellite navigation systems; The methods of expanding the axial ratio beam width with antennas include multi-layer stacking structure, introducing circular current and increasing the effective radiation area, etc., but most of them are for single-frequency point antennas

Currently, few microstrip antennas simultaneously achieve the performance of a wide bandwidth beam

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