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Dual mode modulated backscatter system

  • US 5,649,295 A
  • Filed: 06/19/1995
  • Issued: 07/15/1997
  • Est. Priority Date: 06/19/1995
  • Status: Expired due to Term
First Claim
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1. A radio communication system comprisingan interrogator includingmeans for generating a first modulated signal by modulating a first information signal onto a radio carrier signal, said first information signal indicating to which of multiple response modes a receiving tag should respond,means for transmitting said first modulated signal to said at least one tag,said at least one tag includingmeans for receiving said first modulated signal,means for decoding said first modulated signal to obtain said first information signal,backscatter modulator means for modulating a reflection of said first modulated signal using a second information signal whose content, data rate, or modulation is determined from the contents of said first information signal, thereby forming a reflected second modulated signal,said interrogator further includingmeans for receiving said second modulated signal, andmeans for demodulating said second modulated signal, to obtain said second information signal, whose content, data rate, or modulation was determined from the contents of said first information signal.

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