Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2005-01-04
2005-01-04
Mullen, Thomas (Department: 2632)
Communications: electrical
Condition responsive indicating system
Specific condition
C342S051000
Reexamination Certificate
active
06838989
ABSTRACT:
An RFID transponder is provided with an active backscatter amplifier that amplifies and re-transmits a received signal. The RFID transponder comprises an antenna and a circulator having a first port connected to the antenna. A modulator is connected to a second port of the circulator. An amplifier is connected to a third port of the circulator, with the amplifier connected to the modulator. An RF signal impinging upon the antenna passes through the circulator, the amplifier, and the modulator, and returns to the antenna through the circulator. The modulator further comprises an input coupled to the second port of the circulator and an output coupled to an input of the amplifier. The amplifier has an output coupled to the third port of the circulator. The modulator is adapted to modulate the RF signal using on-off keying.
REFERENCES:
patent: 3685050 (1972-08-01), Cartwright
patent: 4009446 (1977-02-01), De Koning et al.
patent: 4150382 (1979-04-01), King
patent: 4739328 (1988-04-01), Koelle et al.
patent: 4786907 (1988-11-01), Koelle
patent: 4902985 (1990-02-01), Arthur et al.
patent: 4961058 (1990-10-01), Sigmon
patent: 5030807 (1991-07-01), Landt et al.
patent: 5164719 (1992-11-01), Guena et al.
patent: 5305469 (1994-04-01), Camiade et al.
patent: 5373297 (1994-12-01), Briguglio
patent: 5497140 (1996-03-01), Tuttle
patent: 5606323 (1997-02-01), Heinrich et al.
patent: 5701127 (1997-12-01), Sharpe
patent: 5757241 (1998-05-01), Simonutti
patent: 5952922 (1999-09-01), Shober
patent: 5955969 (1999-09-01), D'Hont
patent: 6243012 (2001-06-01), Shober et al.
patent: 6525648 (2003-02-01), Kubler et al.
patent: 20010044315 (2001-11-01), Aoki et al.
patent: 20020044058 (2002-04-01), Heinrich et al.
“Microwave and RF Circuits: Analysis, Synthesis and Design” Max W. Medley; 1993 Artech House, Inc.; pp. 192-209.
Mays Wesley M.
Moore Brad David
Intermec IP Corp.
Mullen Thomas
O'Melveny & Myers LLP
LandOfFree
RFID transponder having active backscatter amplifier for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with RFID transponder having active backscatter amplifier for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and RFID transponder having active backscatter amplifier for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3396294