Open AccessCircular polarized patch antenna with wide 3‐dB axial ratio beamwidth and suppressed backward cross‐polarized radiation for high‐precision marine navigation applications
Author(s) -
Liu Hongmei,
Zhang Yan,
Wang Yao,
Fang Shaojun,
Wang Zhongbao
Publication year - 2021
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/mia2.12121
Subject(s) - beamwidth , axial ratio , optics , radiation , physics , radiation pattern , bandwidth (computing) , circular polarization , materials science , antenna (radio) , microstrip , engineering , telecommunications
Here, a circular polarized (CP) patch antenna with a wide 3‐dB axial ratio beamwidth (ARBW) and suppressed backward cross‐polarized radiation is proposed. A narrow slot is inserted into the ground to widen the 3‐dB ARBWs of the CP antenna. An annular metal strip loaded with a circular row of L‐shaped bent metal branches is etched around the circular radiation patch to reduce backward cross‐polarized radiation, as well as to further increase the 3‐dB ARBW. To validate, a prototype is designed at 1.575 GHz and fabricated. The experimental results show that the 10‐dB impedance matching bandwidth of the fabricated prototype is 25.8%, and the 3‐dB CP bandwidth is 5.1%. Besides, 3‐dB ARBWs of 238° and 259° are obtained at the two principal planes, respectively, with the front‐back ratio of more than 26 dB. Satisfactory agreement is achieved between measurement results and simulated ones.