Broadband high-gain FabryPerot cavity antenna with back radiation reduction

A FabryPerot (FP) cavity antenna simultaneously producing a high-gain, wide-bandwidth, and high front-to-back ratio (FBR) is proposed. To reduce the back radiation, we enclosed all the openings of our antenna with folded metal walls having a length of approximately 0.2 at a center frequency of 1.8 GHz, and to obtain a broader bandwidth and high gain, we employed a superstrate composed of double layered metal strip lines and placed over a feeder antenna. The antenna with folded metal walls compared to without folded metal walls yields a significant reduction in back radiation levels over the operating frequencies. An average suppression in back radiation of 20 dB was obtained, and a maximum gain value of 18.77 dBi has been measured over a 3 dB gain bandwidth of 24.1% (1.642.09 GHz). (c) 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:975978, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27474