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Improved tunable coplanar waveguide (CPW) bandstop filter
Author(s) -
Her ManLong,
Wang YuZhen,
Lin KunYing,
Chen YuWei
Publication year - 2004
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.20091
Subject(s) - coplanar waveguide , stub (electronics) , bent molecular geometry , microwave , band stop filter , bandwidth (computing) , electronic engineering , materials science , optoelectronics , engineering , electrical engineering , optics , telecommunications , physics , low pass filter , structural engineering
An improved tunable coplanar waveguide (CPW) bandstop filter, which exhibits good performance, is proposed in this paper. A novel tunable open stub and a useful formula for frequency shift and impedances are also presented. Further, air bridges and a special method of step compensation in the angle bends are employed to overcome differences in the radiation effects as much as possible. From the measured results, a 33% narrower rejection bandwidth with sharper roll‐off was achieved, particularly in comparison to that of the bent filter. An enormous size reduction of 53% was obtained, compared to the conventional open‐stub structure. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 41: 198–200, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20091
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