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INDUCTIVELY COUPLED PASSIVE RESPONDER AND INTERROGATOR UNIT HAVING MULTIDIMENSION ELECTROMAGNETIC FIELD CAPABILITIES

  • US 3,689,885 A
  • Filed: 09/15/1970
  • Issued: 09/05/1972
  • Est. Priority Date: 09/15/1970
  • Status: Expired due to Term
First Claim
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1. An interrogator-responder system for providing an output signal having an information content corresponding to an uniquely coded information field of a particular responder, and generated in said responder, in response to the interrogator, and comprising, in combination:

  • an interrogator means for establishing an electromagnetic AC power field and receiving an electromagnetic coded information field, and generating the output signal in response thereto;

    a responder tag means positionable in AC power field and coded information field energy exchange relationship to said interrogator means for receiving said AC power field and generating the uniquely coded information field in response thereto;

    said interrogator means comprising;

    a power supply means for providing a controlled source of electric energy;

    a power signal generator means for receiving said controlled electric energy and generating a power signal in response thereto;

    a power field generator means for receiving said power signal and generating said AC power field having a first preselected frequency for inductive coupling into said responder tag means;

    a coded information field receiver means for receiving said uniquely coded information field from said responder tag means and said uniquely coded information field having a second preselected frequency different from said first preselected frequency;

    coded information field detection means powered by said controlled source of electric energy, for detecting the existance of said coded information field in said coded information field receiver means and generating a detected coded signal in response thereto;

    information capture and validation logic means, powered by said controlled electric energy, for receiving said detected coded signal from said coded information field detection means and generating an output signal having an information content corresponding to said uniquely coded information field in response thereto;

    time-base signal generating means for generating a time-base signal and providing said time-base signal to said power signal generator and to said logic means for synchronization;

    said responder tag means is free of active power supplies and comprises;

    power field receiver means for receiving said AC power field from said power field generator of said interrogator means and providing DC tag power signals in response thereto;

    carrier time-base signal generator means for receiving said DC tag power signal and generating a carrier time-base signal at said second preselected frequency in response thereto;

    a code signal generator powered by said DC tag power signal for repetitively generating a unique code signal at a third frequency different from said second frequency in response to said DC tag power input thereto;

    coded information signal generator means powered by said DC tag power signal for receiving said carrier time-base signal at said second frequency and receiving said unique code signal at said third frequency and modulating said carrier time-base signal with said unique code signal to generate a coded information signal unique to said responder tag;

    coded information field generator for receiving said coded information signal and generating said coded information field for said inductive coupling into said coded information field recEiver of said interrogator means.

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