Patent ID: 7986924

Claim:
An impedance control method for a portable mobile communication terminal, the method comprising: varying, by a microprocessor, an impedance of a first variable impedance matching part to set the impedance of the first variable impedance matching part in response to a reception impedance correction signal received from a base station; and varying, by the microprocessor, an impedance of a second variable impedance matching part to transmit a transmission impedance correction signal to a base station and setting the impedance of the second variable impedance matching part in response to a signal returned from the base station, wherein the step of performing the impedance setting of the first variable impedance matching part comprises: varying, by the microprocessor, the impedance of the first variable impedance matching part to receive reception impedance correction signals and to determine a reception strength; selecting the reception impedance correction signal having a strongest strength out of the received reception impedance correction signals; and setting the impedance of the first variable impedance matching part by a relevant impedance when the selected reception impedance correction signal is received, and wherein the impedance setting of the second variable impedance matching part comprises: varying, by the microprocessor, the impedance of the second variable impedance matching part and transmitting the transmission impedance correction signal containing a varied impedance value to the base station; receiving the impedance value and the reception strength from the base station when the impedance variation of the second variable impedance matching part is completed; and performing the impedance setting of the second variable impedance matching part in response to the received reception strength and impedance value.