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

Agâh Oktay Ertay*, Mehmet Abbak, Serkan Şimşek

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)573-581
Number of pages9
JournalInternational Journal of Microwave and Wireless Technologies
Issue number3
Publication statusPublished - 1 May 2016

Bibliographical note

Publisher Copyright:
© Cambridge University Press and the European Microwave Association 2015.


  • Broad stopband
  • Defected ground structure (DGS)
  • Filters
  • Low pass filter
  • Modeling
  • Sharp transition band
  • Simulation and characterization of devices and circuits


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