Passive environmental RFID transceiver
First Claim
1. An apparatus, comprisinga passive radio frequency identification (RFID) tag circuit comprising an oscillator circuit having a component sensitive to an environmental factor, wherein a frequency of a signal output by the oscillator circuit is indicative of a value of the environmental factor;
- wherein a transmission from the RFID tag circuit comprises a first section modulated with an identification code of the RFID tag circuit and a second section modulated with the signal output by the oscillator circuit.
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Accused Products
Abstract
Some embodiments of the invention may incorporate an oscillator circuit into a radio frequency identification (RFID) tag in which the oscillator circuit comprises at least one component that is sensitive to an environmental factor such as temperature or humidity. When the tag responds to an RFID reader, the tag may incorporate the sense environmental parameter into its response by transmitting an oscillating signal whose frequency indicates the value of the parameter. The RFID reader may then determine the parameter by analyzing the resulting analog portion of the waveform in terms of frequency and/or cycle and/or pulse width. In some embodiments, the environmental sensor may be incorporated into the integrated circuit containing the RFID tag circuit.
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Citations
23 Claims
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1. An apparatus, comprising
a passive radio frequency identification (RFID) tag circuit comprising an oscillator circuit having a component sensitive to an environmental factor, wherein a frequency of a signal output by the oscillator circuit is indicative of a value of the environmental factor; wherein a transmission from the RFID tag circuit comprises a first section modulated with an identification code of the RFID tag circuit and a second section modulated with the signal output by the oscillator circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus, comprising
a radio frequency identification (RFID) reader device configured to: -
receive a wireless response from a passive RFID tag; demodulate a first section of the response to determine an identification code for the RFID tag; and demodulate a second section of the response to determine a first value of a first environmental factor sensed by the RFID tag, wherein the first value is based on at least one parameter selected from a list consisting of a frequency of an oscillating signal derived from the demodulated second section and a pulse width determination of the oscillating signal derived from the demodulated second section. - View Dependent Claims (10, 11)
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12. A method, comprising:
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sensing an environmental parameter; producing an oscillating signal whose frequency is indicative of a value of the sensed environmental parameter; and transmitting a wireless signal from a radio frequency identification (RFID) tag, a first section of the signal modulated with an identification code for the RFID tag and a second section of the signal modulated with the oscillating signal; wherein said producing takes place within the RFID tag. - View Dependent Claims (13, 14, 15)
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16. A method, comprising:
- receiving a wireless response from a radio frequency identification (RFID) tag, the response including a first section modulated with an identification code of the RFID tag and a second section modulated with an oscillating signal whose frequency indicates a value of an environmental factor.
- View Dependent Claims (17, 18, 19)
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20. An article comprising
a tangible machine-readable medium that contains instructions, which when executed by one or more processors result in performing operations comprising: receiving a wireless response from a radio frequency identification (RFID) tag, the response including a first section modulated with an identification code of the RFID tag and a second section modulated with an oscillating signal whose frequency indicates a value of an environmental factor. - View Dependent Claims (21, 22, 23)
Specification