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

Eric J. Naglich; Juseop Lee; Dimitrios Peroulis; William J. Chappell

doi:10.1109/TMTT.2011.2175245

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

Eric J. Naglich^*
, Juseop Lee
, Dimitrios Peroulis
, William J. Chappell

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

45 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 language	English
Article number	6095352
Pages (from-to)	21-30
Number of pages	10
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	60
Issue number	1
DOIs	https://doi.org/10.1109/TMTT.2011.2175245
Publication status	Published - 2012 Jan
Externally published	Yes

Bibliographical note

Funding Information:
Manuscript received October 15, 2011; accepted October 26, 2011. Date of publication December 05, 2011; date of current version December 30, 2011. This work was supported by BAE Systems under the Tunable Notch Filter Program and by the Defense Advanced Research Projects Agency (DARPA) under the Purdue Evanescent-Mode Cavity Filter Study Program. The work of E. J. Naglich was supported by the Department of Defense (DoD) under the National Defense Science and Engineering Graduate Fellowship (NDSEG) Program.

Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.

Keywords

Filters
microwave filters
passive filters
tunable filters
tunable resonators

ASJC Scopus subject areas

Radiation
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1109/TMTT.2011.2175245

Cite this

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title = "Extended passband bandstop filter cascade with continuous 0.85-6.6-GHz coverage",

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.",

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note = "Funding Information: Manuscript received October 15, 2011; accepted October 26, 2011. Date of publication December 05, 2011; date of current version December 30, 2011. This work was supported by BAE Systems under the Tunable Notch Filter Program and by the Defense Advanced Research Projects Agency (DARPA) under the Purdue Evanescent-Mode Cavity Filter Study Program. The work of E. J. Naglich was supported by the Department of Defense (DoD) under the National Defense Science and Engineering Graduate Fellowship (NDSEG) Program. Copyright: Copyright 2012 Elsevier B.V., All rights reserved.",

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N1 - Funding Information: Manuscript received October 15, 2011; accepted October 26, 2011. Date of publication December 05, 2011; date of current version December 30, 2011. This work was supported by BAE Systems under the Tunable Notch Filter Program and by the Defense Advanced Research Projects Agency (DARPA) under the Purdue Evanescent-Mode Cavity Filter Study Program. The work of E. J. Naglich was supported by the Department of Defense (DoD) under the National Defense Science and Engineering Graduate Fellowship (NDSEG) Program. Copyright: Copyright 2012 Elsevier B.V., All rights reserved.

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N2 - 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.

AB - 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.

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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