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A modified generalized Chebyshev low‐pass filter with wide stopband
Author(s) -
Kim Inseon,
Kim Kwisoo,
Lim Jongsik,
Ahn Dal
Publication year - 2009
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.24389
Subject(s) - chebyshev filter , stopband , elliptic filter , low pass filter , butterworth filter , passband , band stop filter , voltage controlled filter , control theory (sociology) , filter design , prototype filter , filter (signal processing) , mathematics , ripple , electronic engineering , physics , topology (electrical circuits) , engineering , computer science , mathematical analysis , band pass filter , electrical engineering , combinatorics , control (management) , artificial intelligence , voltage
We developed a modified generalized Chebyshev (MGC) rational function and synthesized a low‐pass filter (LPF) to implement it. The conventional generalized Chebyshev (GC) filter and proposed MGC filter have an equal ripple in passband. However, in stopband, the GC filter has only one transmission zero (or attenuation pole) at a finite frequency (f 0 ), whereas the MGC filter has transmission zeros at two finite frequencies (f 01 and f 02 ). The second transmission zero at f 02 can suppress harmonics (or spurious responses). We designed and fabricated a low‐pass filter according to the proposed theory. The stopband of the MGC filter was 4.7 times wider than that of the GC filter. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1428–1431, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24389