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On-site communication system with RF shielding having pager identification capability

  • US 5,070,329 A
  • Filed: 12/04/1989
  • Issued: 12/03/1991
  • Est. Priority Date: 12/04/1989
  • Status: Expired due to Term
First Claim
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1. In an on-site communication system including an on-site transmitter for transmitting, on a predetermined frequency within a predetermined coverage area, messages to a plurality of portable communication receivers, the portable communication receivers including acknowledge back response capability, a system for the identification of the portable communication receivers comprises:

  • entry means, for allowing access into the predetermined coverage area, said entry means including RF shielding means for shielding the portable communication receivers located therein from the message transmissions by the on-site transmitter;

    detector means, coupled to said entry means for detecting the presence of the portable communication receivers within said entry means;

    identification transmitter means, coupled to said detector means, for transmitting within said RF shielding means a query signal on the predetermined frequency in response to one of the plurality of portable communication receivers being detected within said entry means; and

    identification receiver means, coupled to said entry means, for receiving an acknowledge back signal transmitted by the portable communication receiver located within said RF shielding means in response to the query signal being transmitted, the received acknowledge back signal providing identification of the portable communication receiver entering said entry means.

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