Orbital Angular Momentum Waves Generation using Circular Array Antenna

A uniform circular-based array antenna to generate Orbital Angular Momentum (OAM) waves at sub-6 GHz 5G is presented in this paper. The proposed antenna consists of four identical radiating elements with varying phase difference of 90 degrees arranged in the form of circular configuration. A carefully designed feeding phase shift network to provide similar output energy at output ports with desired phase shift value is designed. To confirm the generation of OAM waves at the desired frequency bands, the phase distribution and the 2D polar form was analyzed. In contrast to other previous works, the proposed antenna design of this paper is very simple to design with higher gain.