Patent ID: 7546107

Claim:
A high frequency receiver provided in a same housing as a housing including a transmitter having a transmission signal generation part, having a frequency band of a receive signal in a vicinity of a frequency of a carrier wave of a transmission signal generated by the transmission signal generation part, and to which a high frequency signal including the receive signal and a transmission signal released from a transmitting antenna of the transmitter is inputted via an antenna, the high frequency receiver comprising: an antenna input terminal to which the high frequency signal is inputted; a mixer having a first input terminal to which the high frequency signal inputted to the antenna input terminal is inputted and a second input terminal to which an output signal from a local oscillator is inputted; and an output terminal to which an output signal from the mixer is inputted, wherein the high frequency receiver comprises a distributed transmission signal input terminal to which at least a part of a distributed transmission signal obtained by distributing the transmission signal is inputted in the housing; a phase shifter to which the distributed transmission signal inputted to the distributed transmission signal input terminal is inputted; a detector for detecting a level of the transmission signal included in the distributed receive signal obtained by distributing the high frequency signal; and a level regulator having a first regulator input terminal to which an output from the detector is coupled and a second regulator input terminal to which the distributed transmission signal is inputted, and the level regulator changes a level of the distributed transmission signal in accordance with an output signal from the detector, and a signal input via the level regulator and the phase shifter and the high frequency signal are synthesized to be inputted to the mixer.