Compact UWB bandpass filter based on crossed dumbbell-stub with notch band using defected microstrip structure

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A compact ultra-wideband (UWB) bandpass filter based on cross dumbbell stub with notch band structures is proposed and implemented. This bandpass filter (BPF) structure consists of directly feed line input/output. As the novelty, the cross dumbbell stub resonator was used and it was placed at the middle of the filter structure. By using this structure, the BPF not only has a compact size but also it has a wide-passband response. To remove unnecessary radio frequency (RF) signal, the rejection (notch) band was also proposed by using a novel technique which uses U-shaped defected microstrip structure (DMS). Moreover, the DMS is constructed at the center between crossed dumbbell resonators. This notch band structure has highly independent and it can be adjusted by modifying the U-shaped structure. Therefore, the specific frequency of the notch band can be selected independently without expanded number of resonator or stub. Furthermore, this BPF is fabricated on 2D-Duroid/RT 5880 substrate with permittivity (ϵr) of 2.2, thickness (h) of 1.57 mm, and loss tangent tand of 0.0009. Furthermore, the measured results show that the UWB-BPF has 3-dB passband from 3.0-12.2 GHz, with notch band at 6.7 GHz and the notch band has attenuation-22 dB. The design structure was verified by a good agreement between simulated and measured result. Overall, the proposed filter design has excellent performance in term of insertion loss, high independent notch-band, compact size, and implementable structures.

Original languageEnglish
Title of host publication2019 16th International Conference on Quality in Research, QIR 2019 - International Symposium on Electrical and Computer Engineering
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728118987
DOIs
Publication statusPublished - Jul 2019
Event16th International Conference on Quality in Research, QIR 2019 - Padang, Indonesia
Duration: 22 Jul 201924 Jul 2019

Publication series

Name2019 16th International Conference on Quality in Research, QIR 2019 - International Symposium on Electrical and Computer Engineering

Conference

Conference16th International Conference on Quality in Research, QIR 2019
CountryIndonesia
CityPadang
Period22/07/1924/07/19

Keywords

  • BPF
  • Crossed-dumbbell
  • Defected microstrip structure
  • Notch
  • UWB

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    Firmansyah, T., Wibisono, G., & Rahardjo, E. T. (2019). Compact UWB bandpass filter based on crossed dumbbell-stub with notch band using defected microstrip structure. In 2019 16th International Conference on Quality in Research, QIR 2019 - International Symposium on Electrical and Computer Engineering [8898293] (2019 16th International Conference on Quality in Research, QIR 2019 - International Symposium on Electrical and Computer Engineering). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/QIR.2019.8898293