Circular polarized patch antenna with wide 3‐dB axial ratio beamwidth and suppressed backward cross‐polarized radiation for high‐precision marine navigation applications

Abstract

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.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Design of circularly polarized antenna with wide overlapped axial‐ratio and gain beamwidths for upper hemispherical coverage

“…While the HPBW is also larger than the work in Zheng et al, 3,9 and Luo et al 23 Although the work in Liu et al 24 and Yuan et al 20 exhibits wider HPBW, the size is larger than the proposed one. For the antennas with wide AR bandwidth, the proposed structure has wider overlapped beamwidth than the antennas in Chen et al, 7 Liu et al, 12 Yan et al, 17 Yang et al, 18 and Liu et al 19 Although the authors' previous work has the widest overlapped beamwidth, the size is large and the weight is heavy due to the use of dielectric lens. Besides, since most of the antennas only concentrate on the HPBWs and 3-dB ARBWs at two cut planes (φ = 0°and 90°), the radiation performances at other planes are uncertain.…”

“…In the past decades, many methods have been presented for improving the 3-dB ARBW [3][4][5][6][7][8][9][10][11][12] or HPBW [13][14][15][16] of CP antennas. However, these studies are focused on only one of the indicators.…”

Wideband single‐fed circularly polarised patch antenna

“…The antenna is a dual-band compact CP antenna with surrounding parasitic elements, and the driven patch is a corner-truncated square patch antenna [13]. Many high-performance CP wideband antennas have been proposed by techniques such as open slots etc [14,15]. In Ref.…”