A Second-Order Cross-Polarization Conversion Metasurface With High Frequency Selectivity
Junyi Wang, Hongyu Shi, Xiaoming Chen, Jianji Yi, Juan Chen, Anxue Zhang, Haiwen Liu
Abstract
In this letter, a reflective polarization-independent second-order cross-polarization conversion metasurface with high frequency selectivity for antiinterference in S-band using guided wave inspired technology is designed. The polarization conversion metasurface is composed of three metallic layers. An L-shaped microstrip line is designed in the bottom layer for polarization conversion. A folded square loop slot is designed in the ground plane of the middle layer to introduce two low-frequency polarization conversion zeros and enhance the frequency selectivity. After simulation and measurement, the polarization conversion ratio of the metasurface reaches 99.93% at the operating frequency of 2.65 GHz, the first zero is at 2.443 GHz, and the low frequency selectivity is 668.85 dB/GHz. The second zero is at 2.395 GHz for eliminating the interference from cell phones and WiFi signals. The insertion loss is less than 1 dB in the band.