NDLI: Synthesis of cascaded N-tuplet filters

Content Provider	IEEE Xplore Digital Library
Author	Yildirim, N. Sen, O.A. Sen, Y.
Copyright Year	2001
Description	Author affiliation: EE Dept., Middle East Tech. Univ., Ankara, Turkey (Yildirim, N.)
Abstract	In the theory of Darlington type filter synthesis extraction of transmission zero sections one by one, leading to a cascade of Darlington-A, B, C, D and Brune sections bears serious limitations like numerical accuracy problems, negative and/or extreme element values or impractical topologies for Darlington-C-D and Brune sections. In this paper all such problems are evaded/eased by extracting the transmission zeros as groups to form circuit sections which are readily convertible to multiple coupled resonator forms. In this approach, transmission zeros at s=0 and s= /spl infin/ are extracted as groups to form doublets of resonators, the j/spl omega/-axis and /spl sigma/-axis transmission zeros are extracted as groups to form triplets of resonators, pairs of j/spl omega/-axis and /spl sigma/-axis transmission zeros and complex transmission zeros are extracted as groups to form quadruplets of resonators, etc. The classical element extraction procedure in transformed frequency domain is revised to cover extraction of complex transmission zeros as forth order section by zero shifting from both s=0 and s= /spl infin/ leading to realisation as a quadruplet of resonators. Thus, the theory of cascade synthesis is generalised to include cascaded doublets, triplets, quadruplets and other N-tuplets of resonators as building blocks. It is found out that the limitations due to usual numerical accuracy problems are also reduced a lot and the resulting element value spreads can be controlled to avoid extreme values.
Starting Page	153
Ending Page	162
File Size	914070
Page Count	10
File Format	PDF
ISBN	078037228X
DOI	10.1109/TELSKS.2001.954866
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-09-19
Publisher Place	Yugoslavia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Filtering theory Resonator filters Lead Microwave filters Circuit topology Coupling circuits Frequency domain analysis Shape control Circuit synthesis Passband
Content Type	Text
Resource Type	Article

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