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A novel compact microstrip lowpass filter with wide rejection band and sharp transition band using diamond-shaped resonator

Published online by Cambridge University Press:  10 September 2013

Mohsen Hayati ,
Mozhgan Amiri  and
Zahra Faramarzi
Mohsen Hayati*
Affiliation:
Electrical Engineering Department, Faculty of Engineering, Razi University, Kermanshah-67149, Iran Faculty of Engineering, Computational Intelligence Research Center, Razi University, Kermanshah-67149, Iran
Mozhgan Amiri
Affiliation:
Electrical Engineering Department, Faculty of Engineering, Razi University, Kermanshah-67149, Iran
Zahra Faramarzi
Affiliation:
Electrical Engineering Department, Faculty of Engineering, Razi University, Kermanshah-67149, Iran
*
Corresponding author: M. Hayati Email: mohsen_hayati@yahoo.com
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Abstract

In this paper, a novel compact microstrip lowpass filter (LPF) using diamond-shaped resonator with wide rejection and sharp transition band is presented. The proposed filter has −3 dB cut off frequency at 2.6 GHz. The maximum insertion loss is only 0.1 dB in the passband and the rejection band extends from 2.89 to 20.84 GHz with the attenuation level better than −21 dB. The transition band is only 0.288 GHz, from 2.606 to 2.894 GHz with corresponding attenuation levels of −3 and −20 dB, respectively. The filter size is 12.4 × 11.5 mm2. The proposed filter is fabricated and tested, where the measurement results are in good agreement with the simulation results. The proposed LPF has compact size, simple structure, wide rejection band, and low insertion loss, where all of these characteristics are essential for LPF in the modern communication circuits.

Keywords

FiltersPassive components and circuits
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 5 , Issue 6 , December 2013 , pp. 713 - 719
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2013 

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