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Compact stepped‐impedance lowpass filter with a slot‐back microstrip line
Author(s) -
Huang Shao Ying,
Lee Yee Hu
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.23284
Subject(s) - microstrip , stopband , low pass filter , filter (signal processing) , acoustics , cutoff frequency , electronic engineering , microwave , electrical impedance , ground plane , engineering , physics , electrical engineering , telecommunications , band pass filter , antenna (radio)
A high‐performance stepped‐impedance low‐pass filter is proposed by using a microstrip line with a longitudinal slot in the ground plane (slot‐back microstrip line). The design process is simple and yet effective in improving the performance of the filter structure. Expressions are proposed to obtain the characteristic impedance of a slot‐back microstrip line. Because of the high characteristic impedance and slow‐wave effect of a slot‐back microstrip line, the proposed filter shows a sharper cutoff and a wider stopband with higher attenuation within a smaller circuit area when compared with a conventional stepped‐impedance low‐pass filter. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1058–1061, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23284