MULTIPLE FREQUENCY DETECTION SYSTEM
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 both the first and second response signals, and determining a detection of said resonant tag based on a comparison between the first and second response signals.
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Abstract
A multiple frequency detection system allows the seamless integration of an almost ideal EAS function with an RFID function. While not being limited to a particular theory, the preferred embodiments integrate EAS technology at, for example, 8.2 MHz or 14 MHz, and RFID technology at, for example, 13.56 MHz in a common antenna package. The use of standard RFID frequencies as forcing functions will allow for the easy packaging of EAS with RFID and have a true roadmap of a scalable technology.
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Citations
42 Claims
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1. A multiple frequency detection system, comprising:
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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 both the first and second response signals, and determining a detection of said resonant tag based on a comparison between the first and second response signals. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9, 10, 11, 42)
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3. (canceled)
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12-22. -22. (canceled)
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23. A method for detecting a resonant tag having a first resonant circuit that is tuned to resonate a first response signal at a first frequency and having a second resonant circuit that is tuned to resonate a second response signal at a second frequency offset from the first frequency, the method comprising:
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(a) providing a pulsed signal to form an interrogation signal; (b) emitting the interrogation signal to impinge on the resonant tag; (c) reading the first response signal from the first resonant circuit resonating at the first frequency in response to the interrogation signal; (d) reading the second response signal from the second resonant circuit resonating at the second frequency; and (e) determining a detection of said resonant tag based on a comparison between the read first and second response signals. - View Dependent Claims (24, 25, 27, 28, 29, 30, 31, 32, 33)
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26. (canceled)
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34. A multiple frequency detection system for detecting a resonant tag having a first resonant circuit that resonates a first response signal at a first frequency and having a second resonant circuit that resonates a second response signal at a second frequency offset from the first frequency, the system comprising:
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means for providing a pulsed signal to form an interrogation signal; means for emitting the interrogation signal to impinge on the resonant tag; means for reading the first response signal from the first resonant circuit resonating at the first frequency in response to the interrogation signal; means for reading the second response signal from the second resonant circuit resonating at the second frequency; and means for determining a detection of said resonant tag based on a comparison between the read first and second response signals. - View Dependent Claims (35, 36, 38, 39, 40, 41)
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37. (canceled)
Specification