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A miniaturized parallel‐coupled microstrip filter using over‐coupled end stages with symmetrical tapped‐line structure
Author(s) -
Lin KunYing,
Liao ShrySann
Publication year - 2008
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.23675
Subject(s) - stopband , microstrip , miniaturization , microwave , electronic engineering , transmission line , engineering , filter (signal processing) , coupling (piping) , electrical impedance , topology (electrical circuits) , line (geometry) , equivalent circuit , electrical engineering , band pass filter , telecommunications , voltage , mechanical engineering , geometry , mathematics
In this article, a miniaturized parallel‐coupled microstrip filter is presented. The miniaturized design saves 80% circuit dimension compared to the conventional parallel‐coupled over‐coupled end stages filter with the symmetrical tapped‐line structure. Several design methods and miniaturization techniques were involved in this study to achieve 5f 0 stopband suppression, including symmetrical tapped‐line, stepped‐impedance structure, bended and folded of transmission lines, and the coupling effect of microstrip‐lines. Also the asymmetrical tapped‐line structure is fabricated to achieve 6 f 0 stopband suppression. Good agreements between the simulated and measured results were also observed in all above cases. Furthermore, no lumped elements, via‐holes, and bonding wires are necessary for this miniaturized coupler, making it very useful for the modern wireless communication systems. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2271–2274, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23675