Selective cloaking circuit for use in radio frequency...

Details Selective cloaking circuit for use in radio frequency... Selective cloaking circuit for use in radio frequency...

2006-06-20

2006-06-20

Hofsass, Jeffery (Department: 2635)

Communications: electrical

Selective

Interrogation response

C340S572100, C340S572400, C340S572500, C340S572700, C340S010400, C343S873000, C343S720000

Reexamination Certificate

active

07064653

ABSTRACT:
The output to the antenna of an RFID tag or label is disconnected from the balance of the RFID chip by means of a series switch activated in response to a logic command, CLOAK, generated by the RFID chip. Activation of the switch disconnects the output to the antenna of the RFID tag without disconnecting its input. The output to the antenna is thus disconnected for a time sufficient to allow the remaining RFID tags in an RF interrogation field to be identified. However, the input of the antenna remains connected and is capable of receiving at any time, including during the cloaking period commands which can lift the tag out of cloaking and allow it to then selectively output its signal.

REFERENCES:
patent: 5963144 (1999-10-01), Kruest
patent: 6072383 (2000-06-01), Gallagher, III et al.
patent: 6690264 (2004-02-01), Dalglish
patent: 1030266 (2000-08-01), None
patent: WO98/29826 (1998-09-01), None
patent: WO99/49410 (1999-09-01), None

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