The design of a compact quasielliptic filter using stepped impedance resonators with harmonic suppression

Yu Wei Chen, Min Hua Ho, Yen Ju Liu

Research output: Contribution to journalArticle

6 Citations (Scopus)


A bandpass filter is designed at 2.4 GHz using two end-connected quarter-wavelength stepped impedance resonators. The quarter-wavelength stepped impedance resonators having one end shorted are formed by a half-wavelength stepped impedance resonator with its middle shorting to ground. The modes that the shorted-end λ/4 stepped impedance resonator supports are the (1 + 2n)/4. An enhanced U-shape coupling feed is adopted in the filter design to reduce the insertion losses as well as to suppress the first higher harmonic. A dual-path design is implemented in the proposed filter to create a quasi-elliptic frequency response. The equivalent circuit model is developed and the experiments are conducted for circuit design verification.

Original languageEnglish
Pages (from-to)800-804
Number of pages5
JournalMicrowave and Optical Technology Letters
Issue number4
Publication statusPublished - 2007 Apr 1


All Science Journal Classification (ASJC) codes

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

Cite this