ArticleApplied magnetic resonance
Uniform Field Re-entrant Cylindrical TE[Formula: see text] Cavity for Pulse Electron Paramagnetic Resonance Spectroscopy at Q-band.
Article in Applied magnetic resonance. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- Design and characterization of a tunable open TEJournal of magnetic resonance (San Diego, Calif. : 1997) · 2025Article
- Use of the Perturbing Sphere Method for the Estimation of Radiofrequency Coils' Efficiency in Magnetic Resonance Applications: Experience from an Electromagnetic Laboratory.Sensors (Basel, Switzerland) · 2024Review
- Uniform Field Resonators for EPR Spectroscopy: A Review.Cell biochemistry and biophysics · 2019Review
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Authors and funding
3 authors.
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Abstract
Uniform field (UF) resonators create a region-of-interest, where the sample volume receives a homogeneous microwave magnetic field ([Formula: see text]) excitation. However, as the region-of-interest is increased, resonator efficiency is reduced. In this work, a new class of uniform field resonators is introduced: the uniform field re-entrant cylindrical TE[Formula: see text] cavity. Here, a UF cylindrical TE[Formula: see text] cavity is designed with re-entrant fins to increase the overall resonator efficiency to match the resonator efficiency maximum of a typical cylindrical TE[Formula: see text] cavity. The new UF re-entrant cylindrical TE[Formula: see text] cavity is designed for Q-band (34 GHz) and is calculated to have the same electron paramagnetic resonance (EPR) signal intensity as a TE[Formula: see text] cavity, a 60% increase in average resonator efficiency [Formula: see text] over the sample, and has a [Formula: see text] profile that is 79.8% uniform over the entire sample volume (98% uniform over the region-of-interest). A new H-type T-junction waveguide coupler with inductive obstacles is introduced that increases the dynamic range of a movable short coupler while reducing the frequency shift by 43% during over-coupling. The resonator assembly is fabricated and tested both on the bench and with EPR experiments. This resonator provides a template to improve EPR spectroscopy for pulse experiments at high frequencies.
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