Frequency agile duplex filter

Telecommunications – Transmitter and receiver at separate stations – Frequency or phase modulation

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C455S061000, C455S023000, C455S201000, C455S108000, C375S241000, C375S242000, C375S268000

Reexamination Certificate

active

07970354

ABSTRACT:
Systems and methods are disclosed for an electronically adjustable signal filter system, which comprises, in some embodiments, a first filter coupled to an antenna coupling network and a second filter, a power amplifier coupled to the first filter, an antenna connected to an antenna coupling network, a pilot tone generator coupled to the first filter, and a first signal source connected to the power amplifier and first filter. In some embodiments, the power amplifier amplifies the first signal, the first filter places a notch into the first signal transmitted to the antenna coupling network, the antenna coupling network combines the first signal and a second signal received from the antenna and transmits a third signal to the second filter.

REFERENCES:
patent: 3696429 (1972-10-01), Tressa
patent: 3699444 (1972-10-01), Ghose et al.
patent: 4177430 (1979-12-01), Paul
patent: 4991165 (1991-02-01), Cronyn
patent: 5117505 (1992-05-01), Talwar
patent: 5444864 (1995-08-01), Smith
patent: 5691978 (1997-11-01), Kenworthy
patent: 6018644 (2000-01-01), Minarik
patent: 6229992 (2001-05-01), McGeehan et al.
patent: 6539204 (2003-03-01), Marsh et al.
patent: 6567649 (2003-05-01), Souissi
patent: 6745018 (2004-06-01), Zehavi et al.
patent: 6957052 (2005-10-01), Kuehn
patent: 6958647 (2005-10-01), Rabinovich et al.
patent: 7058368 (2006-06-01), Nicholls et al.
patent: 7702295 (2010-04-01), Nicholls et al.
patent: 2004/0183624 (2004-09-01), Liang et al.
patent: 2005/0200408 (2005-09-01), Benjamin et al.
patent: 2006/0229030 (2006-10-01), Simon et al.
Beaudin, Steve, et al., “A new SAW band reject filter and its applications in wireless systems,” IEEE Ultrasonics Symposium, 2002, IEEE, vol. 1, pp. 147-151.
Chen, S., et al., “Division-free duplex for wireless applications,” Electronics Letters, vol. 34, No. 2, Jan. 22, 1998, pp. 147-148.
Eid, Eid E., et al., “Adaptive Nulling Loop Control for 1.7-GHz Feedforward Linearization Systems,” IEEE Transactions on Microwave Theory and Techniques, vol. 45, No. 1, Jan. 1997, pp. 83-86.
Ghose, Rabindra, N., “Collocation of Receivers and High-Power Broadcast Transmitters,” IEEE Transactions on Broadcasting, vol. 34, No. 2, Jun. 1988, pp. 154-158.
Gong, Fan, et al., “A Novel Wideband Frequency-Tunable Feedforward Power Amplifier,” Tsinghua University, IEEE, 2002, pp. 1248-1251.
Jeong, Yong-Chae, et al., “A Design of the Noble Vector Modulator,” Chonbuk National University, Korea, 4 pgs., undated but admitted as prior art.
Jeong, Yong-Chae, et al., “A Feedforward Power Amplifier with Loops to Reduce RX Band Noise and Intermodulation Distortion,” Technical Feature, Microwave Journal, Jan. 2002, 8 pgs.
Jeong, Yong-Chae, et al., “A Novel Adaptive Feedforward Amplifier Using an Analog Controller,” Technical Feature, Microwave Journal Editorial Board, 4 pgs., undated but admitted as prior art.
Jian,Chun-Yun, et al., “SAW Band Reject Filter Performance at 850 MHz,” Nortel, Wireless Technology Labs, Canada, 4 pgs., undated but admitted as prior art.
Kang, Sanggee, et al., “Adaptive Feedforward Amplifier Using Digital Controller,” Electronics and Telecommunication Research Institute, Chungnam National University, IEEE, 2003, pp. 2076-2079.
Kang, Sanggee, et al., “Adaptive Feedforward Amplifier Using Pilot Signal,” Electronics and Telecommunication Research Institute, Chungnam National University, IEEE, 2003, pp. 677-680.
Kang, Sangee, et al., “Novel Analysis of the Cancellation Performance of a Feedforward Amplifier,” Electronics and Telecommunications Research Institute, Taejun, Korea, IEEE, 1997, pp. 72-76.
Kannangara, Shyama, et al., “Adaptive Duplexer for Multiband Transreceiver,” W3.3, Victoria University, Australia, IEEE, 2003, pp. 381-384.
Legarda, Jon, et al., “An Adaptive Feedforward Amplifier Under “Maximum Output” Control Method for UMTS Downlink Transmitters,” IEEE Transactions on Microwave Theory and Techniques, vol. 53, No. 8, Aug. 2005, pp. 2481-2486.
O'Sullivan, Tomas, et al., “Adaptive Duplexer Implemented Using Feedforward Technique With a BST Phase Shifter,” TH1A-3, IEEE MTT-S Digest, 2004, pp. 1299-1302.
O'Sullivan, Tomas, et al., “Adaptive Duplexer Implemented Using Single-Path and Multipath Feedforward Techniques with BST Phase Shifters,” IEEE Transactions on Microwave Theory and Techniques, vol. 53, No. 1, Jan. 2005, pp. 106-114.
Narahashi, Shoichi, et al., “Extremely Low-Distortion Multi-Carrier Amplifier—Self Adjusting Feed-Forward (SAFF) Amplifier,” NTT Radio Communications Systems Laboratories, Japan, IEEE, 1991, pp. 1485-1490.
Parsons, K. J., et al., “Effect of delay mismatch on a feedforward amplifier,” IEEE, Proc.-Circuits Devices Syst., vol. 141, No. 2, Apr. 1994, pp. 140-144.
Roussel, Alain, “Feedforward Interference Cancellation System Applied to the 800 MHz CDMA Cellular Band,” Carleton University, Canada, January 2003, 221 pgs.
Schacherbauer, W., et al., “An Interference Cancellation Technique for the Use in Multiband Software Radio Frontend Design,” 30th European Microwave Conference, Paris, 2000, pp. 341-344.
Schacherbauer, W. et al., “A Flexible Multiband Frontend for Software Radios Using High If and Active Interference Cancellation,” WE4B-1, IEEE MTT-S Digest, 2001 pp. 1085-1088.
Silverman, Lawrence, et al., “Vector Modulator Enhances Feedforward Cancellation,” Design Feature—Vector Modulator, Microwaves & RF, Mar. 1998, pp. 83-84, 86-88 and 90.
Smith, Alison M., et al., “A Wideband Architecture for Adaptive Feedforward Linearization,” Simon Fraser University, Canada, IEEE, 1998, pp. 2488-2492.
Talwar, Ashok K., “Reduction of Noise and Distortion in Amplifiers Using Adaptive Cancellation,” Short Papers, IEEE Transactions on Microwave Theory and Techniques, vol. 42, No. 6, Jun. 1994, pp. 1086-1087.
Thornton, William T., et al., “Improved Design Techniques for the Realization of Linear Power Amplifiers for Wireless Transmitters,” University of California—San Diego, California, IEEE, 1999, pp. 151-155.
Williamson, Matthew, et al., “Performance Analysis of Adaptive Wideband Duplexer,” Victoria University, Australia, 5 pgs., undated but admitted as prior art.
Zhou, Jianyi, et al., “Design of a Wideband Adaptive Linear Amplifier with a DSB Pilot and Complex Coherent Detection Method,” Technical Feature, Microwave Journal Editorial Board, Apr. 2006, pp. 104-114.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Frequency agile duplex filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Frequency agile duplex filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency agile duplex filter will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2712887

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.