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Noncontact type IC card and system therefor

  • US 6,343,744 B1
  • Filed: 02/18/2000
  • Issued: 02/05/2002
  • Est. Priority Date: 02/19/1999
  • Status: Expired due to Term
First Claim
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1. A noncontact type IC card comprising:

  • an antenna coil to receive energy of an electromagnetic field radiated from an external device;

    an integrated circuit which can be operated by driving power supplied by the energy of the electromagnetic field; and

    a connecting means electrically connected with an antenna conductor in a surrounding portion of the antenna coil, the actuation of the connecting means changes the inductance of the antenna coil.

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