Ultra‐wideband and high‐efficiency cross polarization converter based on anisotropic metasurface

In this letter, an ultra‐wideband and high‐efficiency reflective cross‐polarization converter based on an anisotropic metasurface for linearly polarized EM waves is proposed. Its unit cell is composed of a two‐corner‐cut square patch mounted on grounded dielectric substrate, which is an anisotropic structure with a pair of mutually perpendicular symmetric axes u and v along directions with respect to y‐axis direction. Numerical simulations indicate that the polarization converter can convert x‐ or y‐polarized incident wave to its cross‐polarized wave in the frequency range from 10.0 to 18.4 GHz with a relative bandwidth of 59.2% and a conversion efficiency higher than 99%. We present a detailed analysis for its polarization conversion, and derive one equation which can calculate the co‐ and cross‐polarized reflected magnitudes at y‐polarized incidence according to the phase differences between the two reflected coefficients at u‐polarized and v‐polarized incidences. The simulated, calculated, and measured results are all in agreement.