UWB bandpass filter with notched band and improved upper stopband characteristics

Jae Kwan Lee, Youngsik Kim

Research output: Contribution to journalArticlepeer-review


In this article, we propose a novel ultra-wideband bandpass filter with an improved upper stopband characteristic and a notched band. The proposed BPF is composed of a coupled double-step impedance resonator, an interdigital slot, a dumbbell-shaped defected ground, and an open-loop defected ground. The measured results show a minimum insertion loss of 0.61 dB at 7.02 GHz except about 5 GHz for the WLAN band and a wide upper stopband with more than 30 dB attenuation at up to 20 GHz. The group delay variation in the passband is less than 0.4 ns. In addition, the proposed BPF has a compact size.

Original languageEnglish
Pages (from-to)2520-2522
Number of pages3
JournalMicrowave and Optical Technology Letters
Issue number11
Publication statusPublished - 2010 Nov


  • bandpass filter
  • defected ground structure
  • interdigital slot
  • notched band
  • 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


Dive into the research topics of 'UWB bandpass filter with notched band and improved upper stopband characteristics'. Together they form a unique fingerprint.

Cite this