Patent ID: 6934557

Claim:
A radio communication equipment comprising: a power supply configured to supply an electric power; a transmitting circuit configured to generate a transmitting signal, said transmitting circuit is configured to be energized by the power supply; a power detection circuit configured to detect the electric-power supplied to the transmitting-circuit and generate a power detection signal; an antenna having an antenna impedance and configured to receive the transmitting signal and generates an antenna reflection signal having a certain phase depending on the transmitting signal; an impedance matching circuit, having a variable impedance, configured to adjust the variable impedance to match the antenna with the transmitting circuit; a phase detection circuit configured to detect the phase of the antenna reflection signal from the antenna to generate a phase detection signal; a selecting circuit configured to select one of the phase detection circuit and the transmitting circuit, and connect the selected one of the phase detection circuit and the transmitting circuit to the antenna; and a control circuit configured to control the selecting circuit to receive the phase detection signal and the power detection signal, and control the impedance matching circuit to set the variable impedance depending on the phase detection signal and the power detection signal.