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An improved stopband and sharp roll off microstrip low pass filter with defected ground structures

Published online by Cambridge University Press:  14 July 2015

Agâh Oktay Ertay ,
Mehmet Abbak  and
Serkan Şimşek
Agâh Oktay Ertay*
Affiliation:
Electronics and Communication Engineering Department, Istanbul Technical University (ITU), 34469, Maslak, Istanbul, Turkey. Phone: +90 212 285 7400
Mehmet Abbak
Affiliation:
Electronics and Communication Engineering Department, Istanbul Technical University (ITU), 34469, Maslak, Istanbul, Turkey. Phone: +90 212 285 7400
Serkan Şimşek
Affiliation:
Electronics and Communication Engineering Department, Istanbul Technical University (ITU), 34469, Maslak, Istanbul, Turkey. Phone: +90 212 285 7400
*
Corresponding author: A.O. Ertay Email: aoertay@itu.edu.tr
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Abstract

In this paper a novel low pass filter (LPF) design procedure is proposed for electromagnetic bandgap based microstrip filters without using classical filter design approach. LPF is designed for ultra-wide stopband and sharp roll-off rate via proposed design procedure. It has been shown that finite periodic fan-shaped defected ground structures (FSDGSs) and double radial stubs (DRSs) yield broad stopband and very sharp transition band. The proposed LPF has −3 dB passband from dc to 1.49 GHz, and −20 dB broad stopband from 1.65 GHz up to 7.41 GHz. Full wave electromagnetic (EM) simulation of the proposed filter is achieved with ANSYS's High Frequency Structure Simulator (HFSS) and equivalent circuit (EC) model of the filter is proposed and verified via Applied Wave Research (AWR) software. To verify the simulations, filter is realized on ARLON AD1000 substrate, and measured with Agilent 5245A PNA-X Vector Network Analyzer. Measurement results of fabricated filter are in good agreement with EM and EC simulations.

Keywords

FiltersBroad stopbandDefected ground structure (DGS)Low pass filterSharp transition bandModelingSimulation and characterization of devices and circuits
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 8 , Issue 3: Journee Nationale des Micro-ondes (JNM) 2015 , May 2016 , pp. 573 - 581
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2015 

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