• single-feed;
  • circularly polarized microstrip patch antenna;
  • periodic structure


A single-feed circularly polarized microstrip patch antenna by using a stacked periodic structure (SPS) is proposed and investigated. By using SPS as a superstrate with a single-feed microstrip patch antenna, gain, impedance and axial ratio bandwidths are significantly improved. It is also shown that this SPS has lower cross-polarization levels compared to conventional stacked patches. It uses low-cost FR-4 and air substrates and, hence, it is attractive for applications where the production cost is of importance. Moreover, a parametric study has been carried out to investigate the effects caused by SPS. Both experimental and theoretical results of the antenna have been presented and discussed. Good agreement between measured and simulated results is obtained. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:50-54, 2012; View this article online at DOI 10.1002/mop.26495