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Microstrip lowpass filter with wide stopband and sharp roll-off using modified radial stub resonator

Published online by Cambridge University Press:  10 May 2016

Mohsen Hayati ,
Mehrnaz Khodadoost  and
Hamed Abbasi
Mohsen Hayati*
Affiliation:
Department of Electrical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran Electrical Engineering Department, Faculty of Engineering, Razi University, Kermanshah, Iran
Mehrnaz Khodadoost
Affiliation:
Electrical Engineering Department, Faculty of Engineering, Razi University, Kermanshah, Iran
Hamed Abbasi
Affiliation:
Department of Electrical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
*
Corresponding author:M. Hayati Email: mohsen_hayati@yahoo.com
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Abstract

In this paper, a microstrip lowpass filter with wide stopband and sharp roll-off is presented. The proposed filter consists of a modified radial stub resonator which is cascaded by four suppressing cells. To reduce the overall size, the transmission lines are folded. The cut-off frequency of the proposed filter is 1.19 GHz. The transition band is approximately 0.2 GHz from 1.19 to 1.39 GHz with corresponding attenuation levels of 3–20 dB. The stopband is from 1.39 to 19 GHz with attenuation level of <20 dB. The insertion loss and return loss in the passband from DC to 0.8 GHz are better than 0.26 and 14 dB, respectively. The proposed filter is fabricated and measured. The simulated and measured results are in good agreement.

Keywords

Microstrip lowpass filterRadial stub resonatorSharp roll-offWide stopband
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 9 , Issue 3 , April 2017 , pp. 499 - 504
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2016 

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References

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