Wideband Dual-Polarized Vortex Beams Reflectarray Antenna with Independently Controllable Dual Modes

A wideband dual-polarized reflectarray is proposed to generate dual-mode vortex beams carrying orbital angular momentum in this paper. The reflectarray unit is composed of a pair of orthogonal tightly coupled dipoles and delay lines, which can provide independent control of the x-polarized and y-polarized incidence by varying the length of delay lines. The dual-mode vortex beam is achieved by independently manipulating the orthogonally linearly polarized incident waves. To verify the design concept, a wideband dual-polarized dual-mode vortex beams reflectarray operating at 5-8GHz is designed. The simulated results show that the dual-polarized vortex beams carrying +2 and -2 mode of orbital angular momentum are successfully generated from 5-8GHz. The orbital angular momentum mode bandwidth in this design is wider than other similar reports.