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Orbital Angular Momentum based Isolation in Concentrically placed Antennas

Orbital angular momentum (OAM) has been previously shown to reduce crosstalk between local antennas. This paper reports that concentrically placed antennas have a high magnitude of isolation. High frequency simulation software (HFSS) is used to design two OAM antenna arrays placed concentrically on a common substrate. Experiments are simulated to determine the isolation between the inner array with mode l=+1 and varying modes of the outer array. It is concluded that high isolation is obtained for even modes of the outer receiver array.