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Inductively powered transponder device

  • US 7,492,260 B2
  • Filed: 07/14/2006
  • Issued: 02/17/2009
  • Est. Priority Date: 10/27/2005
  • Status: Expired due to Fees
First Claim
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1. An inductively powered transponder device comprises:

  • an unpackaged integrated circuit in which is integrated an antenna for receiving power and signal from radio frequency transmissions;

    a heatsink thermally connected to the integrated circuit and having means to prevent eddy currents, wherein the heatsink comprises a metallic layer and the means to prevent eddy currents comprises one or more slots in the metallic layer; and

    a first layer and a second layer of web material attached together to encapsulate the integrated circuit and the heatsink;

    wherein one or both of the first layer and the second layer are formed substantially of paper.

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