Noncontact type IC card and system therefor

摘要

A noncontact type IC card includes an electromagnetic induction coil, integrated circuit, and switch. The electromagnetic induction coil receives the energy of an electromagnetic field radiated from an external device. The integrated circuit can be operated by driving power supplied by the energy of the electromagnetic field. The switch is provided on the electromagnetic induction coil for receiving the energy of the electromagnetic field and switches the inductance of the electromagnetic induction coil.