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Antenna device and card-shaped storage medium

  • US 6,626,363 B2
  • Filed: 11/23/1999
  • Issued: 09/30/2003
  • Est. Priority Date: 11/30/1998
  • Status: Expired due to Term
First Claim
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1. A card storage medium for writing/reading data to/from a predetermined electronic circuit via electromagnetic waves in non-contact, comprising:

  • an antenna for receiving said electromagnetic waves and supplying a predetermined electronic circuit with electromotive force based on energy of the electromagnetic waves; and

    load resistance conversion means for converting the load resistance of said electronic circuit from the viewpoint of said antenna into a predetermined value, wherein the predetermined value is selected such that said load resistance conversion means supplies said electronic circuit with electromotive force of a magnitude adapted to deliver maximum reception power to the electronic circuit.

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