Sharp Response Microstrip LPF using Folded Stepped Impedance Open Stubs

A novel microstrip lowpass filter with high selectivity and wide stopband is proposed that comprises two lateral folded open stubs and a central mirrored semi-circle ended suppressing cell. The proposed filter has cut-off frequency of 2.28 GHz and is very compact. The stopband width with attenuation...

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Bibliographic Details
Published in:Radioengineering 2013-04, Vol.22 (1), p.328-332
Main Authors: S. V. Makki, A. Ahmadi, S. Majidifar, H. Sariri, Z. Rahmani
Format: Article
Language:English
Subjects:
folded open stub
Low pass filter
microstrip technology
sharp response
wide stopband
Online Access:Get full text
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Summary:A novel microstrip lowpass filter with high selectivity and wide stopband is proposed that comprises two lateral folded open stubs and a central mirrored semi-circle ended suppressing cell. The proposed filter has cut-off frequency of 2.28 GHz and is very compact. The stopband width with attenuation level more than -20 dB is equal to 5.47 f_c and the transition band is only 0.14 GHz. This filter is designed, fabricated and measured and the simulated and measured results are in good agreement
ISSN:1210-2512