High gain microstrip antenna design by using FSS superstrate layer

This paper proposes an improved Frequency Selective Surface (FSS) unit with Y-shaped ring. It acts as a superstrate layer loaded on microstrip patch antenna. The simulation results show that the gain of 14.43 dB is achieved at 9.5 GHz. With the help of ray theory, the paper analyzes the work mechanism of the new antenna. The experimental results show that compared with the traditional microstrip antenna, the bandwidth of the new antenna does not change after loading superstrate layer. Its directivity is obviously improved, and the nose cone direction gain increases 7.3 dB.