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Method of placing an electronic responder in or near an electrically conductive article, as well as an electrically conductive article provided with an electronic responder

  • US 5,039,996 A
  • Filed: 05/14/1990
  • Issued: 08/13/1991
  • Est. Priority Date: 02/16/1987
  • Status: Expired due to Term
First Claim
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1. A method of placing an electronic responder in an electrically conductive article for reducing the effects of the conductive article on the electronic responder, said responder having at least one coil designed as an antenna, said coil, in operation, receiving an alternating field produced by an interrogation means, comprising the steps of making a through-bore opening in a surface of the article in registry with the desired position of the responder, and having larger dimensions than the outer dimensions of the responder coil;

  • forming at least one slit in the conductive article extending outwardly from a point on the perimeter of the throughbore opening along the surface of the article to diminish the electromagnetic influence of the conductive article on the electronic responder; and

    positioning said coil in a plane in said electrically conductive article in a way that the magnetic field lines traversing the coil no longer intersect the conductive article.

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