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AssigneeInternational Business Machines Corporation
InventorsAlejandro Gabriel Schrott, Richard Joseph Gambino, Robert Jacob von Gutfeld
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A transponder has a resonant RLC circuit with one or more electromagnetic energy storage components that vary in response to an externally applied modulating energy field. In addition to the externally modulating energy field, a base station transmits a carrier signal with a frequency essentially the same as the quiescent resonant frequency of the RLC circuit. As the component(s) vary, the resonant frequency of the RLC circuit changes, modulating the carrier signal with the external modulating energy field. Effects of the modulation are detected by the base station. Information (e.g., the presence of a tag) is obtained by receiving and demodulating the modulated signal at the base station. One or more of the circuit elements (e.g., different preferred embodiments of one or more capacitors, inductors, and resistors) can be varied (e.g. mechanically) to modulate the carrier signal. This allows the resonant circuit to modulate the carrier signal with multiple modulation frequencies to encode multiple bits of information on the carrier.
A transponder comprising:
A transponder, as in 6, where the movement is a non-resonance response to the external modulating energy field and the external modulating energy field has a frequency not equal to any of the mechanical resonance frequencies of the constrained plate.
A transponder, as in 28, where the first plate is constrained by an elastic link that provides a restoring force giving rise to one or more mechanical resonant frequencies of the first plate.
A transponder comprising:
A system for obtaining information from a transponder, comprising:
A transponder comprising:
A method of creating a modulated carrier field comprising the steps of:
Dependencies are inferred from the claim text.