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Compact stepped-impedance lowpass filter with a slot-back microstrip line

✍ Scribed by Shao Ying Huang; Yee Hu Lee

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

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✦ Synopsis

Abstract

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

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