RFID-based devices and methods for interfacing with a sensor
First Claim
Patent Images
1. A sensor system, comprising:
- an RFID reader;
an RFID chip;
an antenna electrically connected to the RFID chip and configured to receive signals from and transmit signals to the RFID reader;
and a resonant sensing circuit comprising a resonant circuit having a resonant frequency electrically connected to the RFID chip and whose resonant frequency is affected by an environmental characteristic of interest to correspondingly generate a variable resonant frequency indicative of said environmental characteristic of interest;
wherein the RFID chip is configured to modulate a signal received by the antenna from said reader by reducing the frequency thereof and drive the resonant sensing circuit using the modulated signal to obtain sensing circuit output from said variable resonant frequency to provide a response back to the RFID reader, and the antenna is configured to have an impedance which remains substantially uniform during use of the sensor system.
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Accused Products
Abstract
A sensor is provided with an RFID reader, RFID chip, and an antenna electrically coupled to the RFID chip and configured to received signals from and transmit signals to the RFID reader. A sensing material is also electrically connected to the RFID chip and has a variable electrical property. The RFID chip is configured to modulate a signal received by the antenna and drive the sensing material using the modulated signal.
21 Citations
14 Claims
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1. A sensor system, comprising:
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an RFID reader; an RFID chip; an antenna electrically connected to the RFID chip and configured to receive signals from and transmit signals to the RFID reader; and a resonant sensing circuit comprising a resonant circuit having a resonant frequency electrically connected to the RFID chip and whose resonant frequency is affected by an environmental characteristic of interest to correspondingly generate a variable resonant frequency indicative of said environmental characteristic of interest; wherein the RFID chip is configured to modulate a signal received by the antenna from said reader by reducing the frequency thereof and drive the resonant sensing circuit using the modulated signal to obtain sensing circuit output from said variable resonant frequency to provide a response back to the RFID reader, and the antenna is configured to have an impedance which remains substantially uniform during use of the sensor system. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for operating a sensor, comprising:
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providing the sensor including an RFID chip, an antenna electrically connected to the RFID chip, and a resonant sensing circuit comprising a resonant circuit having a resonant frequency electrically connected to the RFID chip and whose resonant frequency is affected by an environmental characteristic of interest to correspondingly generate a variable resonant frequency indicative of said environmental characteristic of interest; wherein the RFID chip is configured to modulate a signal received by the antenna from said reader by increasing the frequency thereof and drive the resonant sensing circuit using the modulated signal to obtain sensing circuit output from said variable resonant frequency to provide a response back to the RFID reader, the antenna has an impedance which remains substantially uniform during use of the sensor; sending the signal from the RFID reader to the RFID chip via the antenna; modulating the signal by the RFID chip to generate the modulated signal by increasing the frequency thereof; driving the resonant sensing circuit using the modulated signal to obtain a sensing circuit output from said variable resonant frequency to provide a response back to the RFID reader by the RFID chip. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A sensor system, comprising:
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an RFID reader; an RFID chip; an antenna electrically connected to the RFID chip and configured to receive signals from and transmit signals to the RFID reader; and a resonant sensing circuit comprising a resonant circuit having a resonant frequency electrically connected to the RFID chip and whose resonant frequency is affected by an environmental characteristic of interest to correspondingly generate a variable resonant frequency indicative of said environmental characteristic of interest; wherein the RFID chip is configured to modulate a signal received by the antenna from said reader by increasing the frequency thereof and drive the resonant sensing circuit using the modulated signal to obtain sensing circuit output from said variable resonant frequency to provide a response back to the RFID reader, and the antenna is configured to have an impedance which remains substantially uniform during use of the sensor system.
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14. A method for operating a sensor, comprising:
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providing the sensor including an RFID chip, an antenna electrically connected to the RFID chip, and a resonant sensing circuit comprising a resonant circuit having a resonant frequency electrically connected to the RFID chip and whose resonant frequency is affected by an environmental characteristic of interest to correspondingly generate a variable resonant frequency indicative of said environmental characteristic of interest; wherein the RFID chip is configured to modulate a signal received by the antenna from said reader by reducing the frequency thereof and drive the resonant sensing circuit using the modulated signal to obtain sensing circuit output from said variable resonant frequency to provide a response back to the RFID reader, the antenna has an impedance which remains substantially uniform during use of the sensor; sending the signal from the RFID reader to the RFID chip via the antenna; modulating the signal by the RFID chip to generate the modulated signal by increasing the frequency thereof; driving the resonant sensing circuit using the modulated signal to obtain a sensing circuit output from said variable resonant frequency to provide a response back to the RFID reader by the RFID chip.
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Specification