Patent ID: 8923783

Claim:
A wireless communication device, comprising: a first amplifier that amplifies a transmission signal; a transmission circuit that processes the transmission signal amplified by the first amplifier; an antenna that transmits the transmission signal processed by the transmission circuit; and a control unit that alternately activates and deactivates the first amplifier, wherein, provided that an impedance as seen from the antenna toward the transmission circuit when the first amplifier is activated by the control unit is denoted by ZonT and an impedance as seen from the antenna toward the transmission circuit when the first amplifier is deactivated by the control unit is denoted by ZoffT, the transmission circuit comprises: a first impedance matching circuit that shifts ZonT and ZoffT such that ZonT matches an impedance of the antenna and an absolute value of a voltage reflection coefficient Γ corresponding to ZoffT increases; and a first phase adjustment circuit that further shifts ZoffT to a high impedance state.