Generation of dual-beam orbital angular momentum vortex beam using transmit arrays

This paper presents a new dual-beam orbital angular momentum (OAM) vortex wave generation method based on the integration of circular antenna array (CAA) with a transmit-array antenna. The transmit unit cell consists of two-layer rings and three-layer patches for independent phase adjustability. A 310° phase coverage with high transmission coefficient is obtained for the transmit unit at the designed frequency of 10 GHz. A fabricated prototype is measured to validate the numerical simulation and theoretical analysis of the proposed design for dual-beam OAM generation. The present design provide a new method to generate dual-beam OAM vortex waves in flexible designed directions for microwave wireless communication applications.