Pulsed magnetic EAS system incorporating single antenna with independent phasing

  • US 6,118,378 A
  • Filed: 11/28/1997
  • Issued: 09/12/2000
  • Est. Priority Date: 11/28/1997
  • Status: Expired due to Term
First Claim
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1. An electronic article surveillance system, comprising:

  • an antenna having first and second antenna loops;

    first and second transceiver circuits coupled to said first and second antenna loops respectively, for respectively generating in a first mode of operation first and second magnetic fields together defining an interrogation zone for a marker generating a characteristic response to said magnetic fields in said interrogation zone, and for receiving signals from said interrogation zone in a second mode of operation;

    said first and second transceiver circuits, when transmitting, alternately generating said first and second magnetic fields substantially in phase with one another and substantially out of phase with one another; and

    ,a detector for evaluating an output signal, representative of said signals received by said first and second transceiver circuits from said interrogation zone, for said characteristic response of said marker.

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