| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a non-contact type IC card containing regulating capacitor and resistor to regulate a sharpness of a resonance circuit by regulating a resistance value in the circuit and a method for regulating its antenna characteristics. SOLUTION: This non-contact type IC card communicates with an external reader/writer in a non-contact manner. In this case, the IC card has a resonance circuit having an antenna coil 13 and a planar regulating resistor in a card base, and can assure a good communicating state by regulating a sharpness Q of the circuit by regulating a resistance value of the regulating resistor 14 in the circuit. A regulating capacitor 15 is provided, and a resonance frequency (f) can be regulated. Antenna characteristic regulation of the IC card can be conducted by regulating the sharpness Q by cutting a part of a plurality of the circuits provide by branching from the antenna coil.</p> |
