Patent ID: 9531340
Filing Date: 2016-12-27
CPC Classification: H03H,H04B

Claim Text:
1. A communication device comprising: a matching circuit that includes a variable capacitance element having a capacitance value varied according to an applied voltage output from a voltage circuit; and a control unit that controls the applied voltage output from the voltage circuit, wherein the control unit includes: a capacitance value measurement unit that changes the applied voltage output from the voltage circuit, and allows a capacitance measuring device connected to the variable capacitance element to measure respective capacitance values of the variable capacitance element before and after a change in the applied voltage; a voltage correction value calculation unit that calculates a voltage correction value for correcting an initial variation of the capacitance value of the variable capacitance element using the respective capacitance values of the variable capacitance element before and after the change in the applied voltage, and respective applied voltage values before and after the change; a correction voltage calculation unit that calculates a correction voltage of the variable capacitance element for canceling the initial variation in the capacitance value of the variable capacitance element using the voltage correction value; and a voltage circuit control unit that adjusts the applied voltage output from the voltage circuit so as to output the correction voltage from the voltage circuit, wherein the control unit adjusts the matching circuit without inputting an oscillation signal into the matching circuit.