Selective cloaking circuit for use in a radiofrequency identification and method of cloaking RFID tags
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United States of America Patent
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-
Feb 10, 2004
Issued Date -
N/A
app pub date -
Jan 23, 2001
filing date -
Jan 23, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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