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Multiple frequency detection system

  • US 7,642,915 B2
  • Filed: 01/17/2006
  • Issued: 01/05/2010
  • Est. Priority Date: 01/18/2005
  • Status: Expired due to Fees
First Claim
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1. A multiple frequency detection system, comprising:

  • a reader that emits a pulse interrogation signal at a first frequency; and

    a resonant tag that receives the pulse interrogation signal at the first frequency and responds to the pulse interrogation signal by transmitting a first response signal resonated at the first frequency, said resonant tag further transmitting a second response signal resonated at a second frequency offset from the first frequency, said reader further reading one of the first and second response signals, and optionally reading the other one of the first and second response signals to detect said resonant tag,wherein said reader further emits a second interrogation signal at the second frequency simultaneously with emission of the pulse interrogation signal at the first frequency, and said resonant tag transmits the second response signal at the second frequency in response to receipt of the second interrogation signal.

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