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Compact sharp‐cutoff wide‐stopband low‐pass filters using H‐shaped coupled microstrip line units
Author(s) -
Velidi Vamsi Krishna,
Sanyal Subrata
Publication year - 2010
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.25166
Subject(s) - stopband , microstrip , microwave , elliptic filter , topology (electrical circuits) , electronic engineering , cutoff frequency , filter (signal processing) , bandwidth (computing) , low pass filter , engineering , coupling (piping) , transmission line , band pass filter , band stop filter , physics , electrical engineering , telecommunications , mechanical engineering
In this article, a single coupled‐line configuration is presented for the design of compact, sharp‐rejection, wide‐stopband low‐pass filters. The proposed filter topology consists of parallel coupled‐lines shorted at the middle. The filtering action results from the generation of three transmission zeros brought about by cross coupling. Design equations and guidelines to adjust both bandwidth and the rejection depth are provided. Theoretical predictions are validated in microstrip line by fabricating a two‐unit prototype filter having better than 25 dB stopband, which is at least five times the filter cut‐off frequency. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1402–1405, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25166