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International Journal of Antennas and Propagation
Volume 2019, Article ID 7630815, 13 pages
https://doi.org/10.1155/2019/7630815
Research Article

Beamwidth-Enhanced Low-Profile Dual-Band Circular Polarized Patch Antenna for CNSS Applications

School of Information Science and Technology, Dalian Maritime University, Dalian 116026, China

Correspondence should be addressed to Shaojun Fang; nc.ude.umld@jhsgnaf

Received 11 June 2019; Revised 20 August 2019; Accepted 22 October 2019; Published 7 November 2019

Academic Editor: Ana Alejos

Copyright © 2019 Hongmei Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A low-profile dual-band circular polarized (CP) patch antenna with wide half-power beamwidths (HPBWs) is presented for CNSS applications. Simple stacked circular patches are used to achieve dual-band radiation. To enhance the HPBW for the two operation bands, a dual annular parasitic metal strip (D-APMS) combined with reduced ground plane (R-GP) is presented. A single-input feed network based on the coupled line transdirectional (CL-TRD) coupler is also proposed to provide two orthogonal modes at the two frequency bands simultaneously. Experimental results show that the 10 dB impedance bandwidth is 32.7%. The 3 dB axial ratio (AR) bandwidths for the lower and upper bands are 4.1% and 6.5%, respectively. At 1.207 GHz, the antenna has the HPBW of 123° and 103° in the xoz and yoz planes, separately. And the values are 127° and 113° at 1.561 GHz.