Gain enhancement of a direct microstrip line fed dielectric resonator antenna using FSS

In this paper, a technique for enhancing the gain of a direct microstrip line fed dielectric resonator antenna (DRA) with a bandpass frequency selective surface (FSS) as superstrate has been proposed. A 3.6 dBi increase in gain is observed when the proposed multi-layered FSS has been placed at a distance of half of the resonating wave length from the ground plane of the microstrip line fed DRA. The antenna with FSS offers a peak gain of 9.1 dBi at the resonating frequency and 5% bandwidth covering the frequency band from 6.42 GHz to 6.75 GHz.