Abstract: The disclosure is directed to a wireless transceiver circuit which includes not limited to: a first waveguide including a first port configured to transmit a Tx signal and to receive a Rx signal, a second port configured to receive the Rx signal from the first port, and a third port configured to transmit the Tx signal to the first port, a Rx path circuit connected to the second port of the first waveguide and configured to receive the Rx signal, a Tx path circuit configured to receive a pre-amplified signal to generate the Tx signal from the pre-amplified signal, and a detection circuit connected between the Tx path circuit and the third port of the first waveguide and configured to detect the Tx signal to turn on or turn off the Rx path circuit. The Tx signal and the Rx signal operate under TDD on a same frequency spectrum.