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ANTENNA CIRCUIT CONSTITUENT BODY FOR IC CARD/TAG AND IC CARD

  • US 20110036914A1
  • Filed: 04/28/2009
  • Published: 02/17/2011
  • Est. Priority Date: 05/09/2008
  • Status: Active Grant
First Claim
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1. An antenna circuit constituent body (10) for an IC card/tag, comprising:

  • a base material (11) made of a resin film;

    a first circuit pattern layer (131) formed on one of surfaces of the base material (11) and made of an electrically conductive body including metal as a main component; and

    a second circuit pattern layer (132) formed on the other of the surfaces of the base material (11) and made of an electrically conductive body including metal as a main component, whereinat least either of the first circuit pattern layer and the second circuit pattern layer (131 and 132) includes a coiled pattern layer,a part of the first circuit pattern layer (131);

    a part of the second circuit pattern layer (132), the part thereof facing the part of the first circuit pattern layer (131) with the base material (11) interposed; and

    a part of the base material (11), the part thereof interposed between the parts of the first circuit pattern layer and the second circuit pattern layer (131 and 132) constitute a capacitor,the first circuit pattern layer (131) and the second circuit pattern layer (132) are electrically connected so as to allow electrical continuity therebetween, andthe base material (11) includes a plurality of void-state-air layers, a relative density of the base material (11) with respect to a density of the resin is less than or equal to 0.9, an average volume of the void-state-air layers is greater than or equal to 2 μ

    m3 and less than or equal to 90 μ

    m3.

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