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Radio frequency tag and reader with asymmetric communication bandwidth

  • US 7,180,421 B2
  • Filed: 11/12/2005
  • Issued: 02/20/2007
  • Est. Priority Date: 11/15/2004
  • Status: Expired due to Fees
First Claim
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1. An asymmetric bandwidth communication system comprising:

  • a. a powered interrogator/reader downlink transmitting in a non-TDCIR signal;

    b. a transponder or tag receiving said non-TDCIR signal to at least partially or wholly power said tag;

    c. said non-TDCIR downlink transmission from said interrogator/reader instructing said transponder to broadcast data;

    d. said transponder uplink communicating with said interrogator/reader using time domain carrierless impulse radio (TDCIR) having ultra wide band width frequency spectrum of a short time duration pulse; and

    e. said powered interrogator/reader receiving the TDCIR ultra wide band short time duration pulse uplink communication;

    whereby data is communicated from said transponder or tag to the said interrogator/reader using very little transponder power and an uncomplicated, low cost transponder design that is easily manufactured.

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