Compact wideband bandpass filters using stepped-impedance resonators and interdigital coupling structures

Cheng Hsien Liang*, Chi-Yang Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

This letter proposes a microstrip λ/4 interdigital stepped-impedance resonator whose impedance ratio can be very low and coupling strength between adjacent resonators can be very large. On the basis of the proposed structure, one four-pole Chebyshev and one four-pole generalized Chebyshev filter with 0.05 dB equal-ripple bandwidths of 48% and 46%, respectively, are designed and fabricated. Both implemented filters have a compact size, a wide passband, a wide upper stopband, and a high spurious passband at near 5.1 times the center frequency. Good agreement between measurements and simulations is observed.

Original languageEnglish
Article number4747367
Pages (from-to)551-553
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume19
Issue number9
DOIs
StatePublished - 1 Sep 2009

Keywords

  • Interdigital coupled lines
  • Microstrip
  • Stepped-impedance resonator (SIR)
  • Wideband bandpass filter (BPF)

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