A high gain microstrip antenna integrated with the novel FSS

Based on the square patch frequency selective surface (FSS) element, a novel FSS unit is proposed in this paper. And the novel FSS unit is used as a spatial filter to improve the performance of the antenna. The single-layer FSS(SL-FSS) and double-layer FSS(DL-FSS) are respectively loaded onto the K band microstrip antenna. And the gain of antenna has been improved. The gain has increased by almost 5.06 dB and 6.86 dB respectively at the resonant frequency of 24GHz. Moreover, the directivity of the antenna is also improved. The half power beamwidth are reduced to 22 degrees and 24 degrees in E-plane. Through the theoretical analysis of the high gain microstrip antenna, the simulated results are almost in agreement with the theoretical analysis results. The simulated results validate the antenna integrated with the novel FSS.