Comment On Sharp-Rejection And Ultra-Wide Bandstop Filter With Five Transmission Zeros Frequencies

Vamsi Krishna Velidi, Abburu Venkata Guru Subramanyam, Veragur Venkataraman Srinivasan,Subrata Sanyal

Microwaves, Antennas & Propagation, IET（2014）

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摘要

In this letter, explicit transmission zero conditions, for the ultra-wide bandstop filter (BSF) with five transmission zeros, are derived using even-odd mode, analysis. The BSF topology is obtained by folding the two connecting transmission lines in a conventional optimum BSF to compose a stub-loaded coupled-line section and using lambda(g)/2 end open-stubs. A necessary and sufficient condition is explored for the crucial coupled-line section to produce three transmission zeros. Further, it is shown that the same five zeros BSF stopband bandwidth and rejection level performance is obtained with compact three zeros BSF (without lambda(g)/2 open-stubs) with improved passband flatness and return loss.

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关键词

band-pass filters,band-stop filters,poles and zeros,ultra wideband technology,bsf,fbw,equivalent model approach,even-odd mode analysis,return loss performance,sharp-rejection filter,stub-loaded coupled-line section,transmission zero frequency,ultrawide bandstop filter,zero-separation fractional bandwidth,band pass filters

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