Generation of Dual-Band Dual-Polarized Orbital Angular Momentum Beams with Holographic Impedance Metasurface

This paper presents a method that can independently modulate dual-polarized Orbit Angular Momentum (OAM) beams in dual bands. The holographic impedance metasurface consists of 30*30 unit cells with both scalar and tensor impedance properties, the generation of beams in different frequency bands can be controlled independently by modulating different parameters. A right-handed circularly polarized (RHCP) OAM beam is generated at 11.2GHz, with a gain of 18.03dBi, an aperture efficiency of 14.93%, and a vortex beam purity of 90%. Two linearly polarized (LP) OAM beams are generated at 18.2GHz, with a gain of 18.16dBi, an aperture efficiency of 23.3%, and a purity of the vortex beam is 85.4% and 83% respectively.