Author(s): YE Xihong, HE Mang, ZHOU Pingyuan, School of Electronics and Information Engineering, Zhonghuan Information College Tianjin University of Technology, School of Information and Electronics, Beijing Institute of Technology
Pages: 759-763
Year: 2015 Issue:  4
Journal: Chinese Journal of Radio Science
Keyword:  microstrip Yagi antenna; endfire; wide beam-width; circularly polarized;
Abstract: A dual-fed circularly polarized(CP)microstrip Yagi antenna with two-stage double-patch directors is proposed.By removing part of the ground plane,the gain and beamwidth at the end-fire direction is enhanced effectively.Due to the use of the dualfeed with equal amplitude but different phase,broadband CP radiation is realized as well.Numerical and measured results show that the overlapped bandwidth of voltage standing wave ratio less than 1.5and axial ratio lower than 3dB at the end-fire direction is about 11%.The proposed antenna has CP radiation from elevation angle 0°to 80°at the elevation plane,while at the azimuthal plane the half power beamwidth is 88°with large front-to-back ratio,which indicates that the proposed antenna is a good candidate for aircraft-or missile-borne communications.