Telecommunications – Transmitter and receiver at separate stations – Short range rf communication
Reexamination Certificate
2005-04-27
2008-05-06
Phu, Sanh D. (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Short range rf communication
C455S068000, C375S295000, C340S398100
Reexamination Certificate
active
07369811
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.
REFERENCES:
patent: 3021521 (1962-02-01), Hutchins
patent: 4075632 (1978-02-01), Baldwin et al.
patent: 4968967 (1990-11-01), Stove
patent: 4970519 (1990-11-01), Minnis et al.
patent: 5805082 (1998-09-01), Hassett
patent: 6107910 (2000-08-01), Nysen
patent: 6114971 (2000-09-01), Nysen
patent: 6320461 (2001-11-01), Lee
patent: 6337599 (2002-01-01), Lee
patent: 6452446 (2002-09-01), Eisenberg et al.
patent: 6853691 (2005-02-01), Kim
patent: 6938200 (2005-08-01), Pax et al.
patent: 6970089 (2005-11-01), Carrender
Morgan & Lewis & Bockius, LLP
Phu Sanh D.
WJ Communications, Inc.
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