PORTABLE COMMUNICATION DEVICE, READER/WRITER DEVICE, AND RESONANT FREQUENCY ADJUSTMENT METHOD

摘要

[Problem] To obtain a stable communication property by making the resonant frequency shift of a reception antenna easily adjustable, in a portable communication device provided with both an IC card function and a R/W function. [Solution] A portable communication device is provided with a reception unit (10), a transmission unit (20), an adjustment signal generation unit (61), an adjustment signal detection unit (13), and a control circuit unit (7). The transmission unit (20) transmits adjustment signals (Sg3) for adjusting a reception resonant frequency to the reception unit (10). The adjustment signal detection unit (13) detects parameters including information relating to the transmission status of the adjustment signals (Sg3) when the adjustment signals (Sg3) are transmitted. The control circuit unit (7) corrects the reception resonant frequency shift on the basis of the detection result from the adjustment signal detection unit (13).