A novel dual-mode wideband band pass filter

A. Ahmadi, S. V. Makki, A. Lalbakhsh, S. Majidifar

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


A novel Wideband (WB) Bandpass Filter (BPF) with improved passband performance using a Defected Ground Structure (DGS) is presented in this paper. The proposed BPF is composed of two novel basic WB resonators and six Dumbbell-Shaped (DS) DGSs. By cascading resonators we can achieve better skirt characteristics, and by using DS-DGSs under interdigital coupled I/O lines we can improve the return loss within the passband. The simulated and measured results are found in good agreement with each other showing a wide passband from 4.93 to 11.62 GHz, a wide upper stopband with around 25 dB attenuation up to 20 GHz, and sharp roll-offs around 0.03 in lower and upper edges.

Original languageEnglish
Pages (from-to)735-742
Number of pages8
JournalApplied Computational Electromagnetics Society Journal
Issue number9
Publication statusPublished - 1 Sept 2014
Externally publishedYes


  • Dual mode
  • Microstrip bandpass filter
  • Wide passband


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