System for identifying radio-frequency identification devices

Details System for identifying radio-frequency identification devices System for identifying radio-frequency identification devices

2006-08-28

2009-12-29

Nguyen, Tai T (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S572400, C340S572700, C340S010100, C340S010340, C340S010400, C340S568100, C340S505000, C342S042000, C342S047000, C342S051000, C342S104000, C342S114000, C455S103000, C455S104000, C455S106000

Reexamination Certificate

active

07639137

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.

REFERENCES:
patent: 3737911 (1973-06-01), Sakuragi et al.
patent: 3878528 (1975-04-01), Majeau
patent: 4725841 (1988-02-01), Nysen et al.
patent: 6317027 (2001-11-01), Watkins

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