Premium
Selective linear phase filters possessing a pair of J ‐axis transmission zeros
Author(s) -
Rhodes J. D.,
Zabalawi I. H.
Publication year - 1982
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.4490100306
Subject(s) - chebyshev filter , passband , stopband , linear phase , control theory (sociology) , coupling (piping) , phase (matter) , amplitude , transmission (telecommunications) , group delay and phase delay , topology (electrical circuits) , mathematics , filter (signal processing) , prototype filter , element (criminal law) , physics , mathematical analysis , band pass filter , low pass filter , computer science , engineering , optics , telecommunications , combinatorics , artificial intelligence , law , control (management) , quantum mechanics , political science , mechanical engineering , computer vision
A design technique is developed for prototype selective linear phase filters which have an equiripple passband amplitude response and a pair of j ‐axis transmission zeros in the stopband while maintaining a linear phase characteristic in the passband. Since the basic technique requires numerical optimization techniques, the element values for several cases have been tabulated together with detailed response characteristics. One important result is that for certain characteristics, one internal cross‐coupling element may be designed to be zero. As a result, in the sixth degree case with only one extra cross‐coupling element between elements 1 and 6 a significant improvement in both the amplitude and group delay performance can be achieved as compared to the Chebyshev case. Owing to its importance, this case is investigated in detail and a 2.6 GHz post decoupled combline filter has been constructed based upon this prototype.