Compact miniaturized stepped-impedance low-pass filters with a broad stopband

  • Yi Chyun Chiou*
  • , Jen Tsai Kuo
  • , Jacob Chen
  • *Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

11 Scopus citations

Abstract

Stepped-impedance low-pass filters (LPFs) are designed to have a miniaturized area and good rejection in wide stopband. The low-Z sections are implemented by microstrips loaded with periodic open-circuit stubs. Adjacent low-Z sections have a strong capacitive coupling through an interdigitated configuration. Equivalent circuit model for the interdigital capacitor is established for CAD purpose. In the stopband of the LPF, through adjusting the capacitance value, two or three transmission zeros can be realized. To enhance the circuit performance in the stopband, a higher-order filter is made by cascading two third-order LPFs with different cutoff frequencies. These filters present not only a broad stopband but also good insertion loss in the passband. Measured results of four fabricated circuits show good agreement with data obtained by circuit analysis and simulation by commercial 3D EM software package.

Original languageEnglish
Title of host publicationAPMC 2005
Subtitle of host publicationAsia-Pacific Microwave Conference Proceedings 2005
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)078039433X, 9780780394339
DOIs
StatePublished - 2005
Externally publishedYes
EventAPMC 2005: Asia-Pacific Microwave Conference 2005 - Suzhou, China
Duration: 04 12 200507 12 2005

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC
Volume3

Conference

ConferenceAPMC 2005: Asia-Pacific Microwave Conference 2005
Country/TerritoryChina
CitySuzhou
Period04/12/0507/12/05

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