Apparatus and method for detuning of RFID tag to regulate voltage

  • US 6,229,443 B1
  • Filed: 06/23/2000
  • Issued: 05/08/2001
  • Est. Priority Date: 06/23/2000
  • Status: Expired due to Term
First Claim
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1. An improvement in a circuit for avoiding overload of RFID tags in high fields comprising:

  • a tuned receiving circuit;

    a voltage sensing circuit coupled to said tuned receiving circuit to sense voltage developed across said tuned receiving circuit from said high fields;

    a transistor coupled to and controlled by said voltage sensing circuit; and

    a circuit element selectively and controllable coupled by said transistor to said tuned receiving circuit to detune said tuned receiving circuit so that overload of said RFID tag in high fields is avoided.

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