RFID tag communication triggered by sensed energy
First Claim
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1. A RFID reader comprising:
- a sensor to monitor an ambient temperature;
a transmitter configured to transmit an interrogation signal only when the ambient temperature corresponds to a predefined threshold condition; and
wherein the RFID tag only sends a response to the interrogation signal when a temperature level detected by a temperature sensor at the RFID tag corresponds to the predefined threshold condition.
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Abstract
An RFID tag is equipped with an energy sensor for receiving an appropriate energy signal or registering an appropriate temperature/environmental level. The RFID tag only responds to a query from an RFID reader if the sensor receives the appropriate stimulation.
37 Citations
20 Claims
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1. A RFID reader comprising:
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a sensor to monitor an ambient temperature; a transmitter configured to transmit an interrogation signal only when the ambient temperature corresponds to a predefined threshold condition; and wherein the RFID tag only sends a response to the interrogation signal when a temperature level detected by a temperature sensor at the RFID tag corresponds to the predefined threshold condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system comprising:
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a RFID reader comprising; a sensor to monitor an ambient temperature; and a transmitter configured to transmit an interrogation signal only when the ambient temperature corresponds to a predefined threshold condition, a RFID tag comprising; an antenna configured to receive the interrogation signal from the RFID reader; a memory for storing tag data; a temperature sensor to detect a temperature level at the RFID tag and determine if the temperature level detected by the temperature sensor corresponds to the predefined threshold condition; circuitry coupled to the RFID reader that is configured to one of read data from the memory of the RFID tag and transmit data to write to the memory of the RFID tag only if the ambient temperature corresponds to the predefined threshold condition. - View Dependent Claims (14, 15)
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16. A system comprising:
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a RFID reader comprising; a sensor to monitor an ambient temperature; and a transmitter configured to transmit an interrogation signal only when the ambient temperature corresponds to a predefined threshold condition, a RFID tag comprising; an antenna configured to receive an RF signal from the RFID reader; and a circuitry in communication with the antenna and configured to; toggle the RFID tag to operate between a first mode and a second mode upon receiving a mode-switching signal, wherein the mode-switching signal comprises an encoded RF signal having one of a first RF code corresponding to the first mode or a second RF code corresponding to the second mode; operate in the first mode when receiving the mode-switching signal containing the first RF code, wherein in the first mode, the circuitry processes the RF signal from the RFID reader and transmits a first response via the antenna prior to experiencing a predetermined condition; operate in the second mode when receiving the mode-switching signal containing the second RF code such that the RFID tag only responds to an RFID reader interrogation signal in the second mode after the first response to the first mode, wherein in the second mode, the circuitry processes the RF signal and transmits a second response via the antenna only after experiencing the predetermined condition. - View Dependent Claims (17, 18)
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19. A method comprising:
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monitoring a change in an ambient temperature existing in an environment; comparing the ambient temperature against a predefined threshold condition, wherein when the ambient temperature corresponds to the predefined threshold condition, transmitting an interrogation signal from an RFID reader to an RFID tag, and receiving a response to the interrogation signal, from the RFID tag, when a temperature level detected by a temperature sensor at the RFID tag corresponds to the predefined threshold condition. - View Dependent Claims (20)
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Specification