Waveguide transition with vacuum window for multiband dynamic nuclear polarization systems

Oleksandr Rybalko, Sean Bowen, Vitaliy Zhurbenko, Jan Henrik Ardenkjær-Larsen

Research output: Contribution to journalJournal articleResearchpeer-review


A low loss waveguide transition section and oversized microwave vacuum window covering several frequency bands (94 GHz, 140 GHz, 188 GHz) is presented. The transition is compact and was optimized for multiband Dynamic Nuclear Polarization (DNP) systems in a full-wave simulator. The window is more broadband than commercially available windows, which are usually optimized for single band operation. It is demonstrated that high-density polyethylene with urethane adhesive
can be used as a low loss microwave vacuum window in multiband DNP systems. The overall assembly performance and dimensions are found using full-wave simulations. The practical aspects of the window implementation in the waveguide are discussed. To verify the design and simulation results, the window is tested experimentally at the three frequencies of interest.
Original languageEnglish
Article number054705
JournalReview of Scientific Instruments
Issue number5
Number of pages5
Publication statusPublished - 2016

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