To improve the RX-mode isolation of asymmetric T/R switches, a new circuit topology is proposed. The proposed asymmetric T/R switch topology features a second-order band-stop filter in its TX path, which extends the bandwidth of isolation in the RX mode. Based on the proposed topology, a Q-band asymmetric T/R switch is designed and implemented in a 0.15-µm GaAs pHEMT technology. Measured isolation in the RX mode is greater than 18.4 dB from 31.7 to 46.3 GHz, corresponding to a 1.46:1 bandwidth.
- microwave integrated circuits
- microwave switches