Orbital angular momentum mode multiplexing with half-mode substrate integrated waveguide antenna

A compact half-mode substrate integrated waveguide (HM-SIW) leaky-wave antenna (LWA) of different high-order orbital angular momentum (OAM) modes is presented in this paper in order to multiplex multiple beams. The LWA is based on a cavity resonator with two feeds of ±90° phase difference. The principle and mode analysis of the resonator is discussed, which give solutions to generating OAM beams of high-order modes on planar antenna at radio domain. The model is designed and simulated using full-wave analysis software.