Design of an Absorptive Fabry-Perot Polarizer and Its Application

This letter presents an absorptive Fabry-Perot polarizer and its application on the antenna for gain enhancement and cross-polarization level reduction. The proposed polarizer is designed to achieve a partial reflectance/transmission and an electromagnetic wave absorptivity more than 90% over 4.5-7.5 GHz in horizontal and vertical polarization, respectively. Equivalent circuits of the proposed polarizer are established to explicitly analyze the performance of the proposed polarizer. A rectangular patch antenna operating at 5.8 GHz, as the source antenna, is rigorously assembled with the proposed polarizer. The simulated results, compared to the source antenna, demonstrate significant gain enhancement (around 8 dB) and cross-polarization level reduction (more than 10 dB), which is experimentally verified by the measured results.