Gain enhancement of microstrip antenna using square aperture superstrate

This paper proposes gain enhancement technique for microstrip antenna by using square aperture superstrate. The microstrip antenna and superstrate is performed as Fabry-Perot resonator antenna, resulting in plentifully attracted properties. The proposed antenna was designed to operate at 12.2 GHz. The measured gain of the antenna was increased to be 11.95 dBi or 5.35 dB improved from the microstrip antenna without superstrate. The proposed antenna also has a good cross-polarization discrimination over 30 dB in both E and H planes. In addition, the square aperture superstrate could be created on a low cost printed broad with low complicate structure. The prototype antenna characteristics were presented and compared, which measured and simulated results.