Broadband notch filter design for millimeter-wave plasma diagnostics

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

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    Abstract

    Notch filters are integrated in plasma diagnostic systems to protect millimeter-wave receivers from intensive stray radiation. Here we present a design of a notch filter with a center frequency of 140 GHz, a rejection bandwidth of ∼ 900 MHz, and a typical insertion loss below 2 dB in the passband of ±9 GHz. The design is based on a fundamental rectangular waveguide with eight cylindrical cavities coupled by T-junction apertures formed as thin slits. Parameters that affect the notch performance such as physical lengths and conductor materials are discussed. The excited resonance mode in the cylindrical cavities is the fundamental TE11. The performance of the constructed filter is measured using a vector network analyzer monitoring a total bandwidth of 30 GHz. We compare the measurements with numerical simulations. © 2010 EURATOM
    Original languageEnglish
    JournalReview of Scientific Instruments
    Volume81
    Issue number10
    Pages (from-to)10D913 (5 pages)
    ISSN0034-6748
    DOIs
    Publication statusPublished - 2010
    Event18th Topical Conference on High-temprature Plasma Diagnostics - Wildwood, New Jersey, United States
    Duration: 16 May 201020 May 2010
    Conference number: 18
    http://htpd2010.pppl.gov/

    Conference

    Conference18th Topical Conference on High-temprature Plasma Diagnostics
    Number18
    Country/TerritoryUnited States
    CityWildwood, New Jersey
    Period16/05/201020/05/2010
    Internet address

    Keywords

    • Fusion energy

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