Multilayer interdigital ultra-wideband filter

Zhang-Cheng Hao*, Jia-Sheng Hong

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Citations (Scopus)


A miniature ultra wideband (UWB) bandpass filter that uses a multilayer interdigital structure is presented in this paper. The quarter-wavelength resonators including microstrip line resonator and coplanar waveguide (CPW) resonator are vertically stacked to achieve a strong coupling for the designed UWB filter. By adopting multilayer configurations, a miniature footprint is achieved. A seven-pole UWB bandpass filter is designed and fabricated using the multilayer liquid crystal polymer (LCP) lamination process, and is measured by using a vector network analyzer. The measured and predicted results are presented with good agreements. The fabricated prototype has a 10 dB return loss bandwidth from 2.8 GHz to 11.0 GHz and a compact size of 9.3 mm by 3.6 mm (0.38 λg by 0.15 λg, where λg is the guided wavelength of 50 Ω microstrip line at centre frequency).

Original languageEnglish
Title of host publication2011 IEEE MTT-S International Microwave Symposium
ISBN (Electronic)9781612847573
ISBN (Print)9781612847542
Publication statusPublished - 4 Aug 2011
Event2011 IEEE MTT-S International Microwave Symposium - Baltimore, MD, United States
Duration: 5 Jun 201110 Jun 2011

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
ISSN (Print)0149-645X


Conference2011 IEEE MTT-S International Microwave Symposium
Abbreviated title IMS 2011
Country/TerritoryUnited States
CityBaltimore, MD


  • Bandpass filter
  • coplanar waveguide (CPW)
  • liquid crystal polymer (LCP)
  • microstrip
  • ultra-wideband (UWB)

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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