Broadband and Efficiency Reflective Polarization Converter in X and Ku Bands Based on an Asymmetric Rod-Shaped Ring with a Hole-Shaped Metasurface

Design and analysis of a broadband reflective polarization-converting metasurface is presented. By designing the periodic structure of the metal-dielectric-metal metasurface, the bandwidth is expanded by using the resonance peak generated by an asymmetric rod-shaped ring with a hole resonance unit which exhibits peak resonances at frequencies of 8.26 GHz, 12.57 GHz, and 16.57 GHz. The simulation results indicate that, in the frequency range from 7.76 to 17.14 GHz, the polarization conversion rate of the polarization conversion metasurface reaches more than 90%. The efficiency is kept higher than 80% with a wide incident angle up to 40 degrees. The relative bandwidth reaches 75%. The experimental results agree well with the simulation results. Operating bandwidth covers 95% of the X and Ku bands. A polarization converter with a simple structure and easy to be fabricated has potential applications in fields like radar and optical communications, wireless communications, etc.