PASSIVE SENSOR TAG SYSTEM
First Claim
1. A passive sensor tag system, comprising:
- a passive electronic sensor tag having a sensor element and a sensor circuit, the sensor element configured to sense a change in a local environmental variable and to alter at least one of a fundamental electrical resonance frequency characteristic of the sensor circuit based on the change in the local environmental variable;
an external readout including an external readout circuit configured to generate a signal having a frequency and a voltage and to transmit the signal through an output antenna to the passive electronic sensor tag, the transmitted signal coupling the sensor circuit and the external readout circuit, the external readout determining the at least one of fundamental electrical resonance frequency characteristic of the sensor circuit based on an impedance of the coupled sensor circuit and external readout circuit, the external readout determining the change in the local environmental variable based on the alteration in the at least one fundamental resonance frequency characteristic of the sensor circuit.
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Abstract
A passive sensor tag system including a passive electronic sensor tag and an external readout. The passive electronic sensor tag including a sensor element configured to sense data in a local environment and to cause a shift in a fundamental electrical resonance frequency characteristic of a sensor circuit based on the sensed data. The external readout including an external readout circuit that is configured to generate a signal having a frequency and a voltage and to transmit the signal through an output antenna. The transmitted signal coupling the sensor circuit and the external readout circuit. The external readout determining a fundamental electrical resonance frequency characteristic of the sensor circuit based on the impedance of the coupled sensor circuit and external readout circuit. The external readout determining the sensed data based the fundamental electrical resonance frequency characteristic of the sensor circuit.
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Citations
13 Claims
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1. A passive sensor tag system, comprising:
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a passive electronic sensor tag having a sensor element and a sensor circuit, the sensor element configured to sense a change in a local environmental variable and to alter at least one of a fundamental electrical resonance frequency characteristic of the sensor circuit based on the change in the local environmental variable; an external readout including an external readout circuit configured to generate a signal having a frequency and a voltage and to transmit the signal through an output antenna to the passive electronic sensor tag, the transmitted signal coupling the sensor circuit and the external readout circuit, the external readout determining the at least one of fundamental electrical resonance frequency characteristic of the sensor circuit based on an impedance of the coupled sensor circuit and external readout circuit, the external readout determining the change in the local environmental variable based on the alteration in the at least one fundamental resonance frequency characteristic of the sensor circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification