Broadband wide-axial-ratio beam circularly polarized microstrip antenna

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 wide-bandwidth axial ratio beam circularly polarized microstrip antenna, which 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 signals from major navigation systems, but also to capture satellite signals of a single satellite navigation system as much as possible. This requires antennas that can achieve broadband and wide beam performance. . Microstrip antennas have the advantages of small size, light weight, easy conformal, and easy to achieve circular polarization, so they have received extensive attention in the field of satellite navigation. The methods for expanding the bandwidth of microstrip antennas usually include additional parasitic elements, increasing the antenna profile, and using high dielectric constant dielectric plates. Although these methods can achieve broadband c...

AI Technical Summary

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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