Applied Magnetic Resonance

, Volume 48, Issue 11–12, pp 1263–1272 | Cite as

Q-Band Loop-Gap Resonator for EPR Applications with Broadband-Shaped Pulses

  • Vasyl Denysenkov
  • Philipp van Os
  • Thomas F. PrisnerEmail author
Original Paper


Recently, Q-band-pulsed electron paramagnetic resonance spectroscopy has strongly advanced its performance by the introduction of high-power microwave amplifiers and the use of shaped pulses. For such applications, the resonator Q value has to be low enough to achieve sufficient bandwidth for short microwave pulses and to reduce the ring-down time after the pulses. However, a low Q value reduces the detection sensitivity as well as the conversion efficiency of the microwave input power to the magnetic field strength at the sample position. Therefore, the resonator Q value has to be optimized for a given microwave input power and specific application. We designed a three-loop/two-gap resonator using CST Microwave Studio for such applications, and tested its performance in comparison with a standard Bruker D2 Q-band microwave resonator by accomplishing broadband SIFTER experiments on a nitroxide model compound.



We thank the German Research Society (DFG) for financial support via the Priority Program New Frontiers in Sensitivity for EPR Spectroscopy (SPP 1601).


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Copyright information

© Springer-Verlag GmbH Austria 2017

Authors and Affiliations

  1. 1.Institute of Physical and Theoretical Chemistry, Center of Biomolecular Magnetic ResonanceGoethe University FrankfurtFrankfurt am MainGermany

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