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A miniaturized parallel-coupled microstrip filter using over-coupled end stages with symmetrical tapped-line structure

✍ Scribed by Kun-Ying Lin; Shry-Sann Liao

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
389 KB
Volume
50
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

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

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