This work studies transmit (TX) and receive (RX) power losses in single antenna in-band full duplex transceiver architectures employing passive self-interference cancellation (SIC) filters. Three different RF front-end (RFFE) approaches to realize passive primary TX-RX isolation – a circulator, an electrical-balanced duplexer (EBD), and quadrature balanced power amplifiers (QBPA), are considered and analyzed.
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