An Efficiency-Enhanced Electrical Balance Duplexer

In this paper, we present an efficiency-enhanced electrical balance duplexer for in-band full duplex transceivers. The proposed electrical balance duplexer eliminates the inherent 3 dB insertion loss of the power amplifier and enables spatial selectivity at the receiver. The circuit and antenna configurations are analyzed and simulated by using full-wave three-dimensional electromagnetic solvers. The proposed electrical balance duplexer leverages the intrinsic orthogonality of waves and the transition between lumped and distributive systems.