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A compact microstrip lowpass filter with wide stopband using rectangular resonator and high impedance elements

Published online by Cambridge University Press:  22 May 2019

Seyed Hamed Kazemi  and
Mohsen Hayati
Seyed Hamed Kazemi
Affiliation:
Electrical Engineering Department, Faculty of Engineering, Razi University, Kermanshah, Iran
Mohsen Hayati*
Affiliation:
Electrical Engineering Department, Faculty of Engineering, Razi University, Kermanshah, Iran
*
Author for correspondence: Mohsen Hayati, E-mail: mohsen_hayati@yahoo.com
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Abstract

In this paper, a microstrip lowpass filter using rectangular resonators is designed. To weaken the undesired harmonics from 10 to 20 GHz, a stair-shaped suppressing cell and also high impedance elements at the edges are utilized. It should be noted that for analyzing the proposed filter, an LC model is used and the design is done in such a way that the coupling effects of the close-up lines are reduced as much as possible, so that they are ignored in the circuit analysis. The designed filter has a cut-off frequency of 1.01 GHz and the transition band is only 0.1 GHz. In addition to compression of dimensions, the stopband bandwidth is 18.7 times the cut-off frequency (18.7 × fc). The attenuation rate in the passband reaches 0.081 dB which indicates that the passband is flat. In the stopband, disturbing harmonics have been dampened to −23.5 dB and a good bandwidth is achieved. The figure of merit of the proposed filter is 180 387 and it is a good benchmark for the overall comparison of the proposed filter with the previous works.

Keywords

Attenuation ratefigure of meritmicrostrip lowpass filterrectangular resonatorsundesired harmonics
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 11 , Issue 9 , November 2019 , pp. 885 - 893
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019 

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