Control of transmission zero by mixed-coupling in a two-stage coupled-resonator filter

Ching Luh Hsu*, Cheng Hsuan Yu, Jen Tsai Kuo

*Corresponding author for this work

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

9 Scopus citations

Abstract

A transmission zero is generated near the passband for the filter consisting of two coupled resonators. The transmission zero can be placed in upper or lower rejection bands by designing the electric and magnetic components of the inter-resonator coupling. An equivalent circuit is developed for explaining the creation of zero and the control of filter bandwidth, y-matrix parameters of the proposed equivalent circuit are formulated. The electric and magnetic components of the coupling associated with parallel-coupled half-wavelength microstrip resonators are extracted for the purpose of filter synthesis. For validating the theory, two experimental filters based on microstrip resonators with mixed-coupling structures are designed and measured.

Original languageEnglish
Title of host publication2007 Asia-Pacific Microwave Conference, APMC
DOIs
StatePublished - 2007
Externally publishedYes
EventAsia-Pacific Microwave Conference, APMC 2007 - Bangkok, Thailand
Duration: 11 12 200714 12 2007

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC

Conference

ConferenceAsia-Pacific Microwave Conference, APMC 2007
Country/TerritoryThailand
CityBangkok
Period11/12/0714/12/07

Keywords

  • Bandpass filter
  • Coupled resonator
  • Microstrip circuit
  • Tapped line
  • Transmission zero

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