Patent ID: 9100058
Filing Date: 2015-08-04
Classification: H04B

Abstract:
1. A portable communication device comprising: a receiver that includes a reception antenna which conducts communication with an external reader/writer device by electromagnetic coupling and in which a received resonant frequency is variable; a transmitter that includes a transmission antenna which conducts communication with an external non-contact data carrier by the electromagnetic coupling and transmits an adjustment signal to the receiver in order to adjust the received resonant frequency; an adjustment signal generator that generates the adjustment signal and outputs the adjustment signal to the transmitter; an adjustment signal detector that detects a parameter including information on a transmission state of the adjustment signal; and a control circuit unit that corrects a deviation of the received resonant frequency based on a detection result of the adjustment signal detector, wherein the reception antenna includes a variable-capacitance element in which a capacitance changes by a control voltage, and wherein the control circuit unit adjusts the received resonant frequency by changing the control voltage applied to the variable-capacitance element based on the detection result of the adjustment signal detector, wherein the adjustment signal detector detects a phase difference between a received signal when the receiver receives the adjustment signal and the adjustment signal as the parameter.