A wideband bandpass filter with wide upper stopband using stepped-impedance cascadable 180° hybrid rings

Chun Hsiang Chi*, Chi-Yang Chang

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

This letter proposes a wideband bandpass filter by cascading two 3-dB stepped-impedance cascadable 180° hybrid rings with a pair of stepped-impedance lines. Thanks to the stepped-impedance lines, a broad upper stopband is achieved. The stepped-impedance vertically installed planar (VIP) coupler is used to implement the ideal 180° phase inverter and crossovers. The experimental results show that this 2-GHz center frequency, fourth order filter has a 10-dB return loss bandwidth of 92.5 % and upper stopband rejection levels of better than -20 dB up to 6.8 GHz. This proposed filter achieves wide passband and broad stopband performance simultaneously.

Original languageEnglish
Pages (from-to)589-591
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume17
Issue number8
DOIs
StatePublished - 1 Aug 2007

Keywords

  • Phase inverter
  • Stepped-impedance
  • Vertically installed planar (VIP) coupler
  • Wideband bandpass filter (BPF)

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