Analytical design of microstrip short-circuit terminated stepped-impedance resonator dual-band filters

Wei Shin Chang*, Chi-Yang Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

This paper proposes an analytical method to design a dual-band filter using the short-circuit terminated half-wavelength stepped-impedance resonator (SIR). The SIR has an advantage to easily control the first and second resonances by adjusting its structural parameters. In the proposed method, the structural parameters of the SIR are obtained analytically according to the two passband center frequencies and bandwidths of the filter. As a result, the achievable specifications of the dual-band filter can be rapidly determined. The coupling between adjacent SIRs is realized by a short-circuited stub, which is characterized as a K-inverter network. The dual-frequency transformer incorporated with the tapped-line input/output structure is used for the external coupling. Applying the analytical equations in the design process, a dual-band filter can be easily and quickly realized. More importantly, compared to the published dual-band filters, the proposed method is easier to design, especially for a relatively high-order dual-band filter. Two fourth-order and one sixth-order dual-band filters are designed and fabricated to demonstrate the proposed method.

Original languageEnglish
Article number5756215
Pages (from-to)1730-1739
Number of pages10
JournalIEEE Transactions on Microwave Theory and Techniques
Volume59
Issue number7
DOIs
StatePublished - 1 Jul 2011

Keywords

  • Bandpass filter (BPF)
  • dual band
  • microstrip
  • stepped-impedance resonator (SIR)

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