Resonant tag circuits useful in electronic security systems

  • US 4,583,099 A
  • Filed: 12/27/1983
  • Issued: 04/15/1986
  • Est. Priority Date: 12/27/1983
  • Status: Expired due to Fees
First Claim
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1. A resonant tag circuit which comprises:

  • an electrically insulating substrate,a first spiral conductive path on a first surface of said substrate,a second spiral conductive path on a second surface of said substrate,said first spiral conductive path and second spiral conductive path, forming inductors and being aligned so that they overlap each other over at least a portion of the length of said conductive paths thereby to form a distributed capacitor by virtue of said alignment,the degree of said overlap contributing to distributed capacitance being at least 70% of the overlap between conductive elements on opposing surfaces of said insulating substrate.

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