Performance Analysis of UCA-Based Two-path OAM System under Misaligned Conditions

In this paper, performance of two-path orbital angular momentum (OAM) system is analyzed under two conditions of uniform circular array (UCA) misalignment, i.e., non-parallel and off-axis. We model the geometrical model of two-path OAM system under misaligned conditions. Then, the intensity and phase profiles of 3-mode OAM beam are analyzed. Next, channel capacity is simulated and analyzed under different tilted angles and heights of transmitting antenna array. The results show that the capacity of the two-path OAM system is higher than that of the LoS OAM system due to the power diffusion between modes caused by the multipath effect when the transmitting antenna array is tilted.