105 GHz Notch Filter Design for Collective Thomson Scattering

Vedran Furtula, Poul Michelsen, Frank Leipold, T. Johansen, Søren Bang Korsholm, Fernando Meo, Dmitry Moseev, Stefan Kragh Nielsen, Mirko Salewski, Morten Stejner Pedersen

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    Abstract

    A millimeter-wave notch filter with 105-GHz center frequency, >20-GHz passband coverage, and 1-GHz rejection bandwidth has been constructed. The design is based on a fundamental rectangular waveguide with cylindrical cavities coupled by narrow iris gaps, i.e., small elongated holes of negligible thickness. We use numerical simulations to study the sensitivity of the notch filter performance to changes in geometry and in material conductivity within a bandwidth of ±10 GHz. The constructed filter is tested successfully using a vector network analyzer monitoring a total bandwidth of 20 GHz. The typical insertion loss in the passband is
    Original languageEnglish
    JournalFusion Science and Technology
    Volume59
    Issue number4
    Pages (from-to)670-677
    ISSN1536-1055
    Publication statusPublished - 2011

    Keywords

    • Fusion energy

    Cite this

    Furtula, V., Michelsen, P., Leipold, F., Johansen, T., Korsholm, S. B., Meo, F., Moseev, D., Nielsen, S. K., Salewski, M., & Stejner Pedersen, M. (2011). 105 GHz Notch Filter Design for Collective Thomson Scattering. Fusion Science and Technology, 59(4), 670-677.