A Dual-Band Linear-to-Circular BroadBand Reflective Polarization Converter Based on Metasurface

In this paper, a single-layer dual-band linear-to-circular reflector is presented. The converter is composed of a U-shaped metal sheet with the middle part wider than the sides for dual-band operation. The unit enables a stable response of 60° to oblique incidence angles in both frequency bands. Under normal incidence, the converter effectively converts x/y linearly polarized (LP) waves to orthogonal circularly polarized (CP) waves at 13.86-21.51 GHz (43.3%) and 27.56-35.98 GHz (26.5%). The proposed metasurface has the advantages of simple planar structure, broadBand and high angular stability, making it suitable for satellite communication and polarization conversion devices.