Single-fed Patch Antenna with Reconfigurable Orbit Angular Momentum Order

Abstract

Order reconfiguration of orbital angular momentum (OAM) is the foundation for wireless communications based on OAM state multiplexing. As the symmetry of a circular patch is disturbed by an arc segment, two degenerate modes can be synthesized under the single-fed condition to generate OAM waves. Due to arc segment independent of the radiation patch, its effective length is controlled by a switching diode to select different order degenerate modes for synthesis. Based on this idea, a reconfiguration of first-order and second-order OAM modes is achieved. In comparison, the performance of low-order OAM mode is better than that of high-order mode.