System for identifying radio-frequency identification devices
First Claim
1. A method of identifying a radio-frequency identification device, the method comprising:
- transmitting a wireless signal that varies over a predetermined range of frequencies to a radio-frequency identification device; and
processing backscatter wireless signals reflected from the radio-frequency identification device according to the radio-frequency identification device'"'"'s predetermined impedance to determine a device signature.
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Accused Products
Abstract
A system for identifying radio-frequency identification (RFID) devices is described. In one embodiment, RFID devices include an antenna and metallic pattern printed on a substrate. A probing platform is used to radiate the RFID devices with an electromagnetic signal (e.g., radio-frequency signal, microwave signal, etc.). Each RFID device generates a quantifiable backscatter depending on the unique impedance of the passive RFID device in response to the electromagnetic signal. The backscatter is employed to uniquely identify the passive RFID device'"'"'s impendence with respect to the probing platform uniquely characterized at predetermined frequencies of the electromagnetic signal.
35 Citations
25 Claims
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1. A method of identifying a radio-frequency identification device, the method comprising:
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transmitting a wireless signal that varies over a predetermined range of frequencies to a radio-frequency identification device; and
processing backscatter wireless signals reflected from the radio-frequency identification device according to the radio-frequency identification device'"'"'s predetermined impedance to determine a device signature. - View Dependent Claims (2, 3, 4, 5)
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6. A method of distinguishing a radio-frequency identification device from a group of radio-frequency identification devices, the method comprising:
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transmitting a wireless signal that varies over a predetermined range of frequencies to a plurality of radio-frequency identification devices, wherein at least one radio-frequency identification device of the plurality of radio-frequency identification devices includes a predetermined reflective impedance configured to reflect at least a portion of the wireless signal with a predetermined reflection pattern; and
determining a unique device signature associated with the predetermined reflective impedance from wireless signals backscattered from the at least one radio-frequency identification device in response to the transmitted wireless signal. - View Dependent Claims (7, 8, 9)
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10. A radio-frequency identification device system, the system comprising:
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a transmitter configured to transmit a wireless signal over a predetermined frequency range;
at least one radio-frequency identification device configured to reflect and scatter at least a portion of the transmitted wireless signal in a pattern associated with the predetermined impedance of the at least one radio-frequency identification device; and
a receiver configured to process the portion of the wireless signal received from the at least one radio-frequency identification device to determine a unique device signature associated with the predetermined impedance of the at least one radio-frequency identification device. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification