Extended passband bandstop filter cascade with continuous 0.85-6.6-GHz coverage

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

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

This paper presents a cascade of tunable bandstop filters with a wide spurious-free upper passband, which is completely spanned by the tuning range of the notch responses. A collection of resonators is shown to be able to provide bandstop filter responses over a 7.8 to 1 tuning range. By using spurious-free upper passband aperture-coupled cavity bandstop filters, multiple resonators, each with octave tuning, can cover a multioctave frequency range in a cascade. It is shown that the upper passband of this type of filter is limited by the reactance of the coupling apertures, which produce an unwanted in-band resonance unless designed properly. The details of this design process are explained and used to design a six-resonator bandstop filter cascade that is able to provide a bandstop filter response with up to 55 dB attenuation over the continuous band of 0.85-6.6 GHz. Through dynamic allocation of the cascade circuit's transmission zeros, one-, two-, three-, and four-pole bandstop filter responses of variable bandwidth can be realized over different frequency ranges, offering numerous bandwidth-attenuation level tradeoff combinations.

Original languageEnglish
Article number6095352
Pages (from-to)21-30
Number of pages10
JournalIEEE Transactions on Microwave Theory and Techniques
Volume60
Issue number1
DOIs
Publication statusPublished - 2012 Jan 1
Externally publishedYes

Fingerprint

bandstop filters
Notch filters
cascades
Resonators
Tuning
resonators
tuning
transmission circuits
apertures
frequency ranges
attenuation
bandwidth
Bandwidth
reactance
octaves
tradeoffs
notches
Poles
poles
filters

Keywords

  • Filters
  • microwave filters
  • passive filters
  • tunable filters
  • tunable resonators

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Radiation

Cite this

Extended passband bandstop filter cascade with continuous 0.85-6.6-GHz coverage. / Naglich, Eric J.; Lee, Ju Seop; Peroulis, Dimitrios; Chappell, William J.

In: IEEE Transactions on Microwave Theory and Techniques, Vol. 60, No. 1, 6095352, 01.01.2012, p. 21-30.

Research output: Contribution to journalArticle

Naglich, Eric J. ; Lee, Ju Seop ; Peroulis, Dimitrios ; Chappell, William J. / Extended passband bandstop filter cascade with continuous 0.85-6.6-GHz coverage. In: IEEE Transactions on Microwave Theory and Techniques. 2012 ; Vol. 60, No. 1. pp. 21-30.
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