High-efficiency ultra-thin polarization converter based on planar anisotropic transmissive metasurface

We present the design, simulation, and characterization of an ultrathin polarization converter based on planar anisotropic transmissive metasurface. The metasurface consists of two identical metallic structures printed on both sides of a dielectric substrate and possesses a nearly uniform transmittance with a π phase difference over the whole bandwidth for waves of orthogonal linear polarizations. It is demonstrated numerically and experimentally that the designed metasurface can high-efficiently change the polarization plane of a linearly polarized plane wave or convert the circularly polarized plane wave into the wave of opposite handedness in a wide frequency bandwidth. The polarization conversion ratios in both cases could reach almost 100% from 15.8 GHz to 16.7 GHz. The proposed metasurface converter may find uses in various applications combining highly efficient control of polarization with a low insertion loss.