Multiple OAM modes generated by patch antenna

In this paper, a circular patch antenna, which can generate orbital angular momentum (OAM) radio waves at 2.4GHz, is proposed. The designed model is established with 8 ports for single OAM mode. The OAM vortex waves can be generated by feeding networks with fixed phase delay feeding sources. Furthermore, the proposed antenna can also be used for producing more OAM modes. Multiple OAM modes are generated by multiple feeding networks, which are designed by microstrip lines. Simulation results of phase distribution demonstrate the proposed antenna can actually generate single OAM mode and multiple OAM modes. The transmission coefficient between different OAM modes proves the proposed antenna can be used for wireless communication.