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Device and method for the simultaneous reading of passive inductive transponders

  • US 20040065735A1
  • Filed: 10/27/2003
  • Published: 04/08/2004
  • Est. Priority Date: 12/20/2000
  • Status: Active Grant
First Claim
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1. Transponder reading device for reading out a plurality of inductive passive transponders having a resonant circuit, the device comprising:

  • a transmitter coil for generating an alternating magnetic field having an operating frequency fB, in which the plurality of transponders may be placed such that they are magnetically coupled to each other; and

    a retuning circuit arranged in the alternating magnetic field and having such a frequency-dependent impedance that a voltage induced in the resonant circuits of the transponders by the alternating magnetic field has a maximum in the range of the operating frequency fB.

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