System for powering and reading RFID tags
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United States of America Patent
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Oct 12, 2010
Grant Date -
Jun 26, 2008
app pub date -
Dec 21, 2006
filing date -
Dec 21, 2006
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system for tracking items using passive RFID tags utilizes separate data and power frequencies. Within an area in which the items are located, one or more data readers are provided but many more separate power modules are distributed through the space, for powering up the tags. With the power nodes distributed, the tags are powered from a relatively short distance, enabling the tags to transmit through a greater distance. One or more of the readers can include a power-node control which sends an RF signal to control on/off status of specific power nodes within the area, so that power nodes can be activated zone by zone, to thereby permit the reader to determine location by zone of products as their RFID tags are read.
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