A UWB bandpass filter with a notched band using dual stepped-impedance stub-loaded resonators

Sangyeol Oh, Beomsoo Shin, Jichai Jeong, Jaehoon Lee

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


In this article, a new notched-band ultra-wide bandpass filter (BPF) is proposed, using dual stepped-impedance stub-loaded resonators (SISLRs), open-circuited stubs, and stepped-impedance ports (SIPs). As dual SISLRs overlay the frequency responses of the two resonators, the in-band performance of dual SISLRs is better than that of a single SISLR under the same external coupling. Open-circuited stubs of length λ/4 were placed between dual SISLRs to reject the wireless LAN interference signal band at 5.8 GHz. In addition, we combined SIPs with dual SISLRs for improved passband performance at high frequencies. The proposed filter was validated via simulation and measurement. The measured return loss of the BPF was less than -10 dB throughout the passband of 3.2-11.01 GHz. The group delay remained relatively flat and less than 0.5 ns throughout this passband, except in the notched band. The rejection bandwidth was 5.73-6.31 GHz.

Original languageEnglish
Pages (from-to)1785-1787
Number of pages3
JournalMicrowave and Optical Technology Letters
Issue number8
Publication statusPublished - 2014 Aug


  • bandpass filters
  • dual resonators
  • notched band
  • stepped-impedance stub-loaded resonator
  • ultra-wide band

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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