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A compact microstrip low-pass filter with ultra wide stopband using compact microstrip resonant cells

Published online by Cambridge University Press:  25 October 2016

Saeed Roshani
Saeed Roshani*
Affiliation:
Department of Electrical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
*
Corresponding author: S. Roshani Email: s_roshani@iauksh.ac.ir
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Abstract

In this paper, a novel compact microstrip low-pass filter (LPF) with ultra wide stop band and sharp roll off, is proposed. In the proposed structure, a high impedance transmission line is loaded by compact microstrip resonant cells, which results in ultra wide stopband. The −3 dB cut-off frequency of filter is 1.5 GHz and the maximum insertion loss is <0.1 dB in the passband. The proposed LPF presents extremely wide stopband from 1.68 to 44 GHz, with more than the −20 dB attenuation level, which suppresses the 2nd to 29th harmonics with high rejection levels. The size of the proposed LPF is only 0.1 λg × 0.19 λg, which shows excellent size reduction. There is a good agreement between the simulated and measured results.

Keywords

Low-pass filters (LPF)Passive components and microwave measurements
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Issue 5 , June 2017 , pp. 1023 - 1027
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2016 

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