Patent ID: 7245883

Claim:
A radio communication apparatus comprising: an antenna; a transmitting apparatus of outputting a transmitting signal in a first frequency band; a duplexer, connected to said antenna and having a single-phase input terminal and a balanced output terminal, of conveying said transmitting signal inputted to said single-phase input terminal to said antenna, outputting a receiving signal in a second frequency band different from said first frequency band received from said antenna substantially as a differential signal from said balanced output terminal and outputting a part of said transmitting signal as an in-phase signal from said balanced output terminal; and a receiving apparatus connected to said balanced output terminal and having a circuit in which a gain of a signal of a differential component is higher than that of a signal of an in-phase component of said in-phase signal, or a loss of the signal of the differential component is lower than that of the signal of the in-phase component.