High-Q tunable bandstop filters with adaptable bandwidth and pole allocation

Eric J. Naglich, Ju Seop Lee, Dimitrios Peroulis, William J. Chappell

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

21 Citations (Scopus)

Abstract

Tunable bandstop filters are demonstrated with wide tuning ranges, tunable bandwidth, and a variable number of dynamically allocated poles. The number of poles can be dynamically applied at different frequencies to maximize isolation for a given interference scenario. These filters are made with evanescent-mode cavities which use a new loading post geometry that results in greater external coupling for a given physical coupling aperture size. This geometry concentrates the magnetic field within the cavity structure near the coupling aperture, allowing for a smaller coupling aperture and reducing perturbation to the feeding transmission line. The design allows for wider bandwidth bandstop filter responses compared to previously reported geometries. Relatively low external Q values are achieved with minimal perturbation to the passband response. A relatively high Q (450 @ 3 GHz) allows for deep notches and good selectivity.

Original languageEnglish
Title of host publicationIEEE MTT-S International Microwave Symposium Digest
DOIs
Publication statusPublished - 2011 Sep 7
Externally publishedYes
Event2011 IEEE MTT-S International Microwave Symposium, IMS 2011 - Baltimore, MD, United States
Duration: 2011 Jun 52011 Jun 10

Other

Other2011 IEEE MTT-S International Microwave Symposium, IMS 2011
CountryUnited States
CityBaltimore, MD
Period11/6/511/6/10

Keywords

  • Cavity resonators
  • filters
  • microwave filters
  • piezoelectric actuators
  • tunable circuits and devices

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Radiation
  • Condensed Matter Physics

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  • Cite this

    Naglich, E. J., Lee, J. S., Peroulis, D., & Chappell, W. J. (2011). High-Q tunable bandstop filters with adaptable bandwidth and pole allocation. In IEEE MTT-S International Microwave Symposium Digest [5972936] https://doi.org/10.1109/MWSYM.2011.5972936