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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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
Issue number10
Pages (from-to)10D913 (5 pages)
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


Conference18th Topical Conference on High-temprature Plasma Diagnostics
Country/TerritoryUnited States
CityWildwood, New Jersey
Internet address


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