Antenna pair with self-interference cancellation for full duplex communication

Abstract

A self-interference cancellation (SIC) antenna pair for full duplex communication is proposed. It consists of two aperture-coupled patch antennas with orthogonal linear polarizations and an auxiliary port loaded with a proper reflective termination. The auxiliary port introduces an indirect coupling path and the coupling signal is reflected to RX port and superposed with the direct coupling to make a cancellation. As a result, the isolation between two antennas is improved from 25dB to more than 40dB over the entire working band of 2.35-2.55GHz, while, it has little influence on return losses and radiation patterns of the two antennas. The performances indicate the proposed antenna pair a good candidate for full duplex communication applications.