A high-gain antenna with U-slot using zero-index metamaterial superstrate

Abstract

A zero-index metamaterial unit cell working over a wide frequency band is presented. A three layer superstrate with metamaterial unit cells arranged in a 5 by 5 array is designed and placed over a mircostrip patch antenna with U-slot for antenna gain enhancement. The simulation results show that the gain of the metamaterial antenna is improved by nearly 4 dB throughout the operating band.