An Electrical Balance Duplexer for FDD Radios that Isolates TX from RX Independently in Two Bands

An Electrical Balance Duplexer (EBD) supports dual-band TX-RX isolation enabling FDD operation at 5–7 GHz for Wi-Fi 6/6E. A programmable network in the EBD can balance the antenna impedance ( $Z$ ANT) in the TX channel and RX channel independently. The EBD provides > 40 dB isolation in an 80 MHz channel bandwidth in the TX band (5–6 GHz), for any $Z_{\text{ANT}}(f_{\text{TX}})$ within $\text{VSWR} =2$ , and independently in the RX band (6–7 GHz) when $Q_{\text{ANT}} . The EBD is designed for < 4 dB RX IL and < 3.8 dB TX IL, and it supports +29 dBm TX output.