US RE40,020 E1
Impedance blocking filter circuit
Frederick J. Kiko, Carlsbad, Calif. (US)
Assigned to Pulse Engineering, Inc., San Diego, Calif. (US)
Filed on Dec. 29, 2003, as Appl. No. 10/748,729.
Application 09/425778 is a continuation of application No. 10/408030, filed on Apr. 03, 2003.
Application 10/408030 is a continuation in part of application No. 09/370137, filed on Aug. 09, 1999, granted, now 6,181,777.
Application 09/370137 is a continuation in part of application No. 09/195522, filed on Nov. 19, 1998, granted, now 6,188,750.
Application 10/748729 is a reissue of application No. 09/425778, filed on Oct. 22, 1999, now 6,212,259, filed on Apr. 03, 2001.
Int. Cl. H04M 1/24 (2006.01); H04M 1/00 (2006.01); H04M 9/00 (2006.01); H04M 11/00 (2006.01)
U.S. Cl. 379—32.01  [379/8; 379/30; 379/377; 379/412] 29 Claims
OG exemplary drawing
 
[ 18. A telecommunication impedance blocking filter circuit, comprising:
at least one input terminal;
at least one output terminal;
a first filter stage disposed in electrical series between said at least one input and output terminals;
a second filter stage disposed in electrical series with said first filter stage, said second stage comprising a capacitor and switch disposed in series with at least one another;
a third filter stage disposed in electrical series with said second filter stage; and
a fourth filter stage disposed in electrical series with said third filter stage, said fourth stage being specifically adapted to reduce return loss;
wherein at least one of said first through fourth stages comprises a suppression circuit. ]