RADIO COMMUNICATION DEVICE

摘要

PROBLEM TO BE SOLVED: To perform temperature compensation of the resonant frequency of an antenna circuit at high speed.SOLUTION: A radio communication device 1 includes: an antenna circuit 11 including at least an LC resonance circuit constituted by an inductance component and a capacitance component composed of a variable capacitance element 17 that can change the capacitance value according to an applied voltage value; an RFIC chip 12 connected to the antenna circuit 11 and generating a control voltage to the variable capacitance element 17; and a temperature compensation circuit 14 including a thermistor 18 connected in series or a parallel to the variable capacitance element 17, temperature-compensating the control voltage generated by the RFIC chip 12, and applying the temperature-compensated control voltage to the variable capacitance element 17. The temperature compensation circuit 14 adjusts the control voltage by the change of specific resistance of the thermistor 18 itself due to a temperature environment so that at least a part of capacitance changes of the variable capacitance element due to the temperature environment is canceled.