On the Inherent Self-Interference Suppression of Full-Duplex Phased Arrays

Abstract

This paper quantitatively investigates the inherent self-interference (SI) suppression property of dual-polarized full-duplex (FD) linear phased array antennas. The amount of systemic SI suppression is derived for an $N\times 1$ array as a function of the phase taper applied on it. The systemic SI suppression occurs due to the destructive interference of signals in different phased array channels. Results indicate more than 10–15 dB SI suppression for most beam directions, and around 2 dB SI suppression for the normal beam direction.