Reconfigurable-order bandpass filter for frequency agile systems

Hjalti H. Sigmarsson, Juseop Lee, Dimitrios Peroulis, William J. Chappell

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

23 Citations (Scopus)


This paper presents a tunable bandpass filter with a reconfigurable filter order. The proposed filter consists of an array of tunable resonators with variable inter-resonator coupling structures between adjacent cavities. This allows the frequency selectivity of the filter to be adjusted for the given spectral environment without any geometrical modifications to the filter structure. To demonstrate the concept a 2 × 2 resonator array is fabricated using substrate integrated evanescent-mode cavity resonators at 3.2 GHz. Each resonator has an adjustable frequency response and can be tuned from 2.77 to 3.55 GHz. The filter has two separate signal paths, either through two or four resonators. The reconfigurable inter-resonator coupling is implemented with floating vias inside a coupling iris. The vias are connected using variable capacitors and can be included or excluded from the iris by adjusting the capacitance. This structure shows the potential for the inclusion of reconfigurable-order filters in future agile radio systems.

Original languageEnglish
Title of host publication2010 IEEE MTT-S International Microwave Symposium, MTT 2010
Number of pages4
Publication statusPublished - 2010
Externally publishedYes
Event2010 IEEE MTT-S International Microwave Symposium, MTT 2010 - Anaheim, CA, United States
Duration: 2010 May 232010 May 28

Publication series

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


Other2010 IEEE MTT-S International Microwave Symposium, MTT 2010
Country/TerritoryUnited States
CityAnaheim, CA


  • Bandpass filters
  • Cavity filters
  • Evanescent-mode filters
  • Tunable filters

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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