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Short-distance communication antenna and methods of manufacturing and using the short-distance communication antenna

  • US 5,694,139 A
  • Filed: 06/22/1995
  • Issued: 12/02/1997
  • Est. Priority Date: 06/28/1994
  • Status: Expired due to Term
First Claim
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1. A communication antenna provided on a card reader/writer to transmit and receive an information signal from said card reader/writer to and from a non-contacting information card by electromagnetic induction, comprising:

  • a substrate insulating material;

    a first antenna conductor;

    a second antenna conductor; and

    a plurality of adjustment strips, whereinsaid first and second antenna conductors and said plurality of adjustment strips are respectively formed on an upper surface and a lower surface of said substrate insulating material to form a plurality of conductor patterns in the form of a plurality of loops, said plurality of conductor patterns formed on said upper surface and said lower surface of said substrate insulating material being connected through a through-hole such that currents in adjacent loops flow in opposite directions.

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