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Resonant tag and deactivator for use in an electronic security system

  • US 4,567,473 A
  • Filed: 11/20/1984
  • Issued: 01/28/1986
  • Est. Priority Date: 05/10/1982
  • Status: Expired due to Term
First Claim
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1. For use in an electronic security system which includes means for providing in a controlled area an electromagnetic field of a frequency which is swept within a predetermined range, and means for detecting the presence of a resonant tag circuit having a resonant frequency within said range, a resonant tag circuit comprising:

  • a planar substrate of dielectric material;

    a tuned circuit on said substrate in circuit configuration and resonant at said frequency;

    said tuned circuit having a pair of conductive areas on respective opposite surfaces of the substrate to define a capacitor of the tuned circuit; and

    means within the conductive areas defining a path between the conductive areas and through the substrate at which an arc discharge will preferentially occur in response to an electromagnetic field at said frequency of sufficient energy, and operative to destroy the resonant properties of the tuned circuit.

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