Multiple frequency detection system
First Claim
Patent Images
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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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
25 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 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. 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 at the first frequency to form an interrogation signal; (b) emitting the interrogation signal to impinge on the resonant tag; (c) transmitting the first response signal from the first resonant circuit by resonating at the first frequency in response to the interrogation signal; (d) transmitting the second response signal from the second resonant circuit by resonating at the second frequency; (e) reading one of the first and second response signals, and optionally reading the other one of the first and second response signals to detect the resonant tag (f) providing a second interrogation signal at the second frequency; and (g) simultaneously with step (b), emitting the second interrogation signal to impinge on the resonant tag, wherein step (d) transmits the second response signal in response to the second interrogation signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A multiple frequency detection system 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 system comprising:
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means for providing a pulsed signal at the first frequency to form an interrogation signal; means for emitting the interrogation signal to impinge on the resonant tag; means for transmitting the first response signal from the first resonant circuit by resonating at the first frequency in response to the interrogation signal; means for transmitting the second response signal from the second resonant circuit by resonating at the second frequency; means for reading one of the first and second response signals, and optionally reading the other one of the first and second response signals to detect the resonant tag; means for providing a second interrogation signal at the second frequency; means for simultaneously emitting both the interrogation signal and the second interrogation signal to impinge on the resonant tag; and means for transmitting the second response signal in response to the second interrogation signal. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification