A Single-fed Octagonal OAM Antenna Based on CMT

Aiming at the current complex problem of generating orbital angular momentum (OAM) methods, this paper proposes a method for generating the first-order vortex electromagnetic waves using a single-structure patch antenna based on the characteristic mode theory (CMT), which effectively simplifies the application system of OAM. Based on the octagonal patch antenna, this paper uses CMT to analyze the current wave mode of the patch antenna, selects the orthogonal degenerate mode, and designs a reasonable feeding method to obtain a patch antenna that works in the 5GHzWIFI band. It can stably generate an OAM wave. The experimental results show that the OAM wave generated by the antenna has good rotation and symmetry, and it also verifies that CMT is an effective tool for guiding the design of the OAM antenna structure.