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Method and apparatus for dynamically-tuned communication with one among myriad tags

  • US 20070120649A1
  • Filed: 08/07/2006
  • Published: 05/31/2007
  • Est. Priority Date: 09/23/2005
  • Status: Active Grant
First Claim
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1. A method for use with a base station comprising a tunable antenna and myriad RF tags nearby, the method comprising the steps of:

  • transmitting a power/clock field from the antenna at a first frequency below 1 MHz, thereby providing power and clock to a plurality of the RF tags;

    while the power/clock field is being transmitted, first transmitting a data signal from the antenna at a second frequency, the second frequency higher than the first frequency and below 1 MHz, and receiving a response from at least a first one of the RF tags at the antenna while not receiving a response from at least a second one of the RF tags;

    tuning the antenna differently than during the first transmitting;

    while the power/clock field is being transmitted, for a second time transmitting a data signal from the antenna at the second frequency, and receiving a response from the at least a second one of the RF tags at the antenna.

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