RINGUP/ RINGDOWN INTERROGATION OF RFID TAGS
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Accused Products
Abstract
The method of interrogating an RFID memory device (14) including one or more vibrating members (16-34) each being able to resonate at a different known resonant frequency uses a ring-up/down interrogation technique which exploits a property of the resonance increments in relation to the background that is not exploited in steady-state interrogation techniques. This ring-up/down interrogation technique operates by application of an electrical stimulus of appropriate band width to which one or more of the resonances can respond and absorb some amount of energy, holding it in (ultimately) mechanical form (“ring-up”) (228). This stimulus is then reduced to zero, and the electrical response appearing across the terminals of the device then recorded (“ring-down”)(230).
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Citations
34 Claims
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1-17. -17. (canceled)
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18. A method of interrogating an RFID memory device encoding data, the memory device including one or more vibrating members each being able to resonate, upon application of a ring-up signal, at a different known resonant frequency selected from a series of known resonant frequencies within a frequency range, the method including the steps of:
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(a) applying a sequence of ring-up signals to the memory device, each ring-up signal being applied in a different frequency partial-band within the frequency range; (b) after each ring-up signal, receiving a ring-down signal from the memory device; (c) detecting resonances of the vibrating members from the ring-down signals; and (d) determining the encoded data from the detected resonances. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. An RFID interrogator for interrogating an RFID memory device encoding data, the memory device including one or more vibrating members each being able to respond, upon application of a ring-up signal, at a different known resonant frequency selected from a series of known resonant frequencies within a frequency range, the RFID interrogator including:
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ring-up circuitry for applying a sequence of ring-up signals to the memory device, each ring-up signal being applied in a different frequency partial-bands within the frequency range; ring-down circuitry for receiving a ring-down signal from the memory device after each ring-up signal; and analysis circuitry and/or software for detecting resonances of the vibrating members from the ring-down signals, and for determining the encoded data from the detected resonances.
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Specification