SYSTEMS AND METHODS FOR CONTROLLING RADIO-FREQUENCY IDENTIFICATION (RFID) TAG COMMUNICATION
First Claim
1. A radio-frequency identification (RFID) system comprising:
- a plurality of RFID tags, wherein each of the plurality of RFID tags comprises;
an impedance element configured to change an impedance value of the RFID tag; and
a controller communicatively coupled to the impedance element;
wherein each of the plurality of RFID tags receives a control signal comprising an identifier associated with one of the plurality of RFID tags and wherein the one of the plurality of RFID tag, upon identifying the identifier in the received control signal, dynamically adjusts the impedance value associated with the one of the plurality of RFID tags.
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Abstract
Systems and methods for radio-frequency identification (RFID) tag communication are provided. One radio-frequency identification (RFID) tag includes a communication device configured to communicate with an RFID reader and an impedance element configured to change an variable impedance of the RFID tag. The RFID tag further includes at least one switch connected to the impedance element and a controller connected to the at least one switch and configured to control operation of the switch between open and closed states based on a control signal received from the RFID reader, wherein the variable impedance of the RFID tag is changed between a first modulating impedance value and a second modulating impedance value when the switch is changed between the open and closed states.
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Citations
20 Claims
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1. A radio-frequency identification (RFID) system comprising:
a plurality of RFID tags, wherein each of the plurality of RFID tags comprises; an impedance element configured to change an impedance value of the RFID tag; and a controller communicatively coupled to the impedance element; wherein each of the plurality of RFID tags receives a control signal comprising an identifier associated with one of the plurality of RFID tags and wherein the one of the plurality of RFID tag, upon identifying the identifier in the received control signal, dynamically adjusts the impedance value associated with the one of the plurality of RFID tags. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system comprising:
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an RFID reader comprising a processor to; receive one or more backscattering signals in response to a plurality of interrogation signals sent by the RFID reader to a plurality of RFID tags transmit a control signal to the plurality of RFID tags based on an event associated with the received one or more backscattered signals, wherein the control signal comprises an identifier associated with one of the plurality of RFID tags; the plurality of RFID tags, wherein each of the plurality of RFID tags comprises; an impedance element configured to change an impedance value of the RFID tag; and a controller communicatively coupled to the impedance element, wherein the one of the plurality of RID tag, upon identifying the identifier in the received control signal, dynamically adjusts the impedance value associated with the one of the plurality of RFID tags. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 19, 20)
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17. A method comprising:
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receiving, at an RFID reader, one or more backscattering signals in response to a plurality of interrogation signals sent by the RFID reader to a plurality of RFID tags; transmitting, by the RFID reader, a control signal to the plurality of RFID tags based on an event associated with the received one or more backscattered signals, wherein the control signal comprises an identifier associated with one of the plurality of RFID tags; wherein each of the plurality of RFID tags comprises; an impedance element configured to change an impedance value of the RFID tag; and a controller communicatively coupled to the impedance element, adjusting, at the one of the plurality of RFID tags, upon identifying the identifier in the received control signal, the impedance value associated with the one of the plurality of RFID tags. - View Dependent Claims (18)
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Specification