Passive environmental RFID transceiver

Details Passive environmental RFID transceiver Passive environmental RFID transceiver

2006-03-22

2008-11-04

Tweel, Jr., John A (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S010410, C340S447000

Reexamination Certificate

active

07446660

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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