Radio-frequency identification (RFID) tag employing unique...

Details Radio-frequency identification (RFID) tag employing unique... Radio-frequency identification (RFID) tag employing unique...

2007-11-13

2007-11-13

Goins, Davetta W. (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S010100, C340S010340, C340S870030, C342S044000

Reexamination Certificate

active

11059047

ABSTRACT:
A radio-frequency identification (RFID) tag employing a unique reception window and method for operating the tag system provides low-power operation for enhanced tag battery life, while providing addressable tags that can receive commands and data from the system, which can be a wireless local area network (WLAN) incorporating location finding for locating the tags. Interference with other tags and other transmitters is prevented by either using a sniffer circuit to determine that no network transmission is in progress, or by using a special non-interfering coding sequence. A receiver within the tag is operated for a predetermined period of time after a periodic transmission is made from the tag, and an address decoder determines if the tag is being addressed. The receiver can receive data and/or commands after being addressed and is shutdown if the window time elapses, the tag is not addressed, or at the completion of data/command transfer.

REFERENCES:
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patent: 6104279 (2000-08-01), Maletsky
patent: 6512478 (2003-01-01), Chien
patent: 6917291 (2005-07-01), Allen
patent: 7042353 (2006-05-01), Stilp
patent: 2004/0046016 (2004-03-01), Becker et al.
patent: 2004/0078151 (2004-04-01), Aljadeff et al.
patent: WO 2005/013190 (2005-10-01), None

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