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International Journal of Antennas and Propagation
Volume 2016 (2016), Article ID 2363705, 15 pages
Research Article

Circularly Polarized Microstrip Yagi Array Antenna with Wide Beamwidth and High Front-to-Back Ratio

1Electronic Information Engineering Department, Zhonghuan Information College, Tianjin University of Technology, Tianjin 300380, China
2School of Information Engineering, Zhejiang University of Technology, Zhejiang 310014, China

Received 10 October 2015; Revised 16 January 2016; Accepted 27 January 2016

Academic Editor: Symeon Nikolaou

Copyright © 2016 Yun Hao 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.


A circularly polarized (CP) Microstrip Yagi array antenna (MSYA) is designed in order to achieve high front-to-back ratio and high gain over wide range in the forward radiation space. A Wilkinson power divider owning two output ways with the same magnitude and different phase is used to feed the antenna. Parametric studies are carried out to investigate the effects of some key geometrical sizes on the antenna’s performance. A prototype of the antenna is fabricated, and good agreement between the measured results and the numerical simulations is observed. The overlap bandwidth of VSWR ≤ 1.5 and AR ≤ 3 dB is about 11%. The steering angle () between the peak gain direction and the broadside can achieve 35°, reaches 19 dB, and the gain at the front point () is only 4.3 dB lower than the maximum gain (). The antenna has a wide beamwidth CP radiation pattern over wide spatial range including 0° ≤ ≤ 90° in vertical plane and −35° ≤ ≤ 55° in horizontal plane.