Mode Decomposition Analysis of Orbital Angular Momentum Antenna Array Using Spectrum and Mode Number Estimation

This paper investigates the radiation characteristics of a circular phased antenna array that generates orbital angular momentum (OAM) beam basing mode decomposition of the array. The relationship between the OAM beam characteristics and the structural parameters of the antenna array is analyzed to obtain OAM spectrum and mode number estimation. A circular array is simulated to verify the proposed analysis method.