105 GHz Notch Filter Design for Collective Thomson Scattering

Research output: Contribution to journalJournal article – Annual report year: 2011Researchpeer-review


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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
Issue number4
Pages (from-to)670-677
Publication statusPublished - 2011

    Research areas

  • Fusion energy

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