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Backscatter transponder interrogation device

  • US 6,611,224 B1
  • Filed: 05/14/2002
  • Issued: 08/26/2003
  • Est. Priority Date: 08/18/1997
  • Status: Expired due to Fees
First Claim
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1. A backscatter transponder interrogator, comprising:

  • (a) a transmitter, emitting an interrogation signal for interacting with a backscatter transponder within an interrogation field;

    (b) at least two antennas, each having a different and complementary property, such that a backscatter response from a backscatter transponder is likely to be preferentially received by at least one of said at least two antennas;

    (c) a receiver, selecting an output from a selected antenna, and demodulating the backscatter response to produce an information signal; and

    (d) a digitally controlled oscillator, producing an output controlling said transmitter and employed by said receiver to demodulate the backscatter response.

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