In a radio transceiver operating in a time division duplex system, a cancellation use transmission signal which is reverse in phase and equal in amplitude to a leakage transmission signal from an antenna in the signal transmission is supplied to an input port of the receiving amplifier of a receiver connected to an antenna system applied in common to the signal transmission. The transmission signal is fed via a circulator, which separates a transmission and reception path, to the antenna. The leakage transmission signal from the antenna is inputted via the circulator to the receiving amplifier. The cancellation use transmission signal is fed to the receiving amplifier via a second circulator which distributes the transmission signal and cancellation use signal disposed at an output side of the transmitting amplifier.