Broadband Metamaterial Polarizing Reflector at X-Band Frequencies for RIS Application

A broadband metamaterial reflector for polarization manipulation based on square split ring resonator and cross sign structure is proposed in this paper. The ability of the metamaterial reflector to transform a linearly polarized incident wave to a cross-polarized or circularly polarized wave is shown. Simulation results shows a cross-polarization average polarization conversion ratio of greater than 80% for normal incident linearly polarized waves over a frequency range of 7.7 GHz to 10.7 GHz. The reflector is planned to be used in reconfigurable intelligence surface (RIS) applications where signal polarization control is critical.