Patent ID: 7114653

Claim:
An IC card communicating with a card reader by receiving a high-frequency signal transmitted from the card reader comprising: an antenna unit provided on an IC card body, the IC card rectifying the high-frequency signal to generate an operating voltage, and demodulating a modulating signal superimposed on the high-frequency signal, wherein the antenna unit is composed of paired electrostatic coupling antennas spaced from each other; the paired electrostatic coupling antennas comprise first and second metallic thin films arranged on a front surface of or in the vicinity of the front surface of the IC card body, separate from each other, and third and fourth metallic thin films arranged on a back surface of or in the vicinity of the back surface of the IC card body, separate from each other; and the first and third metallic thin films are opposed to each other and connected to each other to form one of the paired electrostatic coupling antennas; and the second and fourth metallic thin films are opposed to each other and connected to each other to form the other of the paired electrostatic coupling antennas.