Yoshihiro Ikefuji

Card mounted with circuit chip and circuit chip module

IC card and IC chip module

Communications system having an authentication function

Data communication transponder and communications system employing it

Circuit chip mounted card and circuit chip module

IC card and method of using IC card

Tag responsive to high frequency for varying capacitance of capacitor in power source

Responder, integrated circuit chip, noncontact ic card, and self power needless type device in noncontact ic card communication system, and automatic adjustment method for self power needless type device

Response device in contact/contactless ic card communication system

Data communication equipment, data communication system, and data communication method