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Articles

A novel microstrip lowpass filter with sharp roll-off and ultra-wide stopband using SICMRC

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Pages 1475-1485 | Received 27 Aug 2013, Accepted 30 Mar 2014, Published online: 25 Nov 2014
 

Abstract

This paper presents a novel microstrip lowpass filter with sharp roll-off and ultra-wide stopband using stepped-impedance resonator and bended transmission line structure. The filter includes stepped-impedance prototype filter and stepped-impedance compact microstrip resonator cells that are combined in one structure. The proposed filter has good specifications such as sharp roll-off, ultra-wide stopband and low insertion loss. The transition band is approximately 0.25 GHz from 1.75 to 2 GHz with corresponding attenuation levels of −3 and −40 dB. The attenuation level in the stopband is better than −20 dB that is achieved from 1.94 to 23 GHz, and the insertion loss in the passband is less than 0.4 dB. The proposed filter is fabricated and measured, and the simulation and measurement results are found to be in good agreement with each other.

Additional information

Funding

This research project was supported by the Kermanshah Branch, Islamic Azad University.

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