Bandpass filter of forked step impedance resonator with harmonic suppression in diplexer applications

Min-Hua Ho, Chung I.G. Hsu, Chen Mao Rao

Research output: Contribution to journalArticle

6 Citations (Scopus)


A novel two-stage forked stepped-impedance-resonator (FSIR) bandpass filter design is presented. The FSIR originated from an SIR has its both open ends split as a fork structure. A tunable zero from the coupled lines is created to suppress the second harmonic of the resonator. Two additional zeros obtained from using the asymmetric tapped-line feed are used to improve the filter's frequency selectivity. A diplexer design based on the FSIR structure is presented. Experiments are conducted to verify the circuit design. Good agreements between the measurements and the simulations are observed.

Original languageEnglish
Pages (from-to)2665-2668
Number of pages4
JournalMicrowave and Optical Technology Letters
Issue number11
Publication statusPublished - 2007 Nov 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

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