System and method for sensitivity optimization of RF receiver using adaptive nulling
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United States of America Patent
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May 6, 2008
Grant Date -
Feb 16, 2006
app pub date -
Apr 27, 2005
filing date -
Apr 30, 2004
priority date (Note) -
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Abstract
The present invention provides sensitivity enhancement for a single antenna RFID interrogating device by separately coupling a nulling signal formed using a portion of a transmit signal into a receiver. The phase and amplitude of nulling signal can be adjusted so that the nulling signal cancels that a reflected transmit signal from the antenna, resulting in the small backscattered signal from the distant RFID tag to be more easily detected, and improving the sensitivity of the RFID receiver.
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