A Novel Microstrip Reflectarray Antenna with Ultra-Wideband Feed

This paper presents a novel microstrip reflectarray utilizing multi-resonant element, which is comprised of a square ring and a square metallic patch. To decrease the blockage effect of the feed source, a Vivaldi antenna is selected as the feed. A 7×7 element reflectarray is designed, and the Vivaldi antenna is placed above the center of the reflector. The simulation results show that maximum gain of the proposed antenna is 18.82 dBi at the working frequency 5.8 GHz and has 18.5% 1- dB gain bandwidth.