Wave transmission lines and networks – Coupling networks – Delay lines including long line elements
Reexamination Certificate
2005-10-25
2005-10-25
Le, Dinh T. (Department: 2816)
Wave transmission lines and networks
Coupling networks
Delay lines including long line elements
C333S02800T, C333S164000, C330S151000
Reexamination Certificate
active
06958663
ABSTRACT:
An in-band group delay equalizer is formed in a simple circuit configuration so as to have a flat group delay characteristic over a wide frequency band without having a peak of group delay near each passband edge. The in-band group delay equalizer includes a plurality of convex group delay circuits. Each convex group delay circuit is formed of one hybrid coupler and two resonators connected to respective divided output ports of the hybrid coupler. The center frequencies of the respective convex group delay circuits are set to be different from each other so that the overall group delay characteristic of the in-band group delay equalizer becomes flat. The bandwidth and the group delay can be easily adjusted. A distortion compensation amplifier with very low distortion can be realized using such an in-band group delay equalizer.
REFERENCES:
patent: 3277403 (1966-10-01), Cohn
patent: 3967220 (1976-06-01), Tagashira et al.
patent: 4197514 (1980-04-01), Kasuga et al.
patent: 4595882 (1986-06-01), Silagi et al.
patent: 4818959 (1989-04-01), Katoh
patent: 5119050 (1992-06-01), Upshur et al.
patent: 5789998 (1998-08-01), Kim et al.
patent: 6317013 (2001-11-01), Hershtig
patent: 6664869 (2003-12-01), Hershtig
patent: 2002/0153971 (2002-10-01), Hershtig
patent: 0 454 637 (1991-01-01), None
patent: 1 071 156 (2001-01-01), None
patent: 58 223901 (1983-12-01), None
patent: 2001-36304 (2001-02-01), None
patent: 2001036304 (2001-02-01), None
patent: 2001119206 (2001-04-01), None
patent: 2001-119206 (2001-04-01), None
patent: 2001257505 (2001-09-01), None
patent: WO 01/01511 (2001-01-01), None
patent: WO01/01511 (2001-01-01), None
patent: WO 02/080301 (2002-10-01), None
Korean Office Action issued Oct. 1, 2004.
Chen, M.H., “The Design of a Multiple Cavity Equalizer”, IEEE Transactions on Microwave Theory and Techniques, IEEE Inc., New York, vol. 20, No. 9, (Sep. 1982), pp. 1380-1383.
European Search Report dated Feb. 18, 2004.
Eihama Toru
Matsudaira Makoto
Yamada Yasuo
Dickstein Shapiro Morin & Oshinsky LLP.
Le Dinh T.
LandOfFree
In-band group delay equalizer and distortion compensation... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with In-band group delay equalizer and distortion compensation..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and In-band group delay equalizer and distortion compensation... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3449145