Ultra-broadband Multi-channel Hermite-Gaussian Beams Excitation Based on Polarization Conversion Metasurface

In this paper, an ultra-broadband multi-channel Hermite-Gaussian (HG) beams excitation metasurface has been designed. The proposed polarization conversion meta-atom (PCMA) used to form HG metasurface can reflect cross-polarized waves from linearly polarized waves and co-polarized waves from circularly polarized waves in an extremely wide operating band (2.513 GHz to 10.406 GHz). The x-polarized (x-pol), y-polarized (y-pol), left-handed circularly polarized (LHCP), and right-handed circularly polarized (RHCP) high-order HG modes have emerged based on a single HG metasurface under fundamental Gaussian mode illumination. The proposed structure opens a new avenue for applications of polarization diversity technology in microwave and millimeter wave wireless communication.