Uniform Field Re-entrant Cylindrical TE $$_{01\text {U}}$$ 01 U Cavity for Pulse Electron Paramagnetic Resonance Spectroscopy at Q-band

摘要: Uniform field (UF) resonators create a region-of-interest, where the sample volume receives homogeneous microwave magnetic ( $$B_1$$ ) excitation. However, as region-of-interest is increased, resonator efficiency reduced. In this work, new class of uniform introduced: re-entrant cylindrical TE $$_{\text {01U}}$$ cavity. Here, UF cavity designed with fins to increase overall match maximum typical $$_{011}$$ The for Q-band (34 GHz) and calculated have same electron paramagnetic resonance (EPR) signal intensity cavity, 60% in average $$\Lambda _\mathrm{ave}$$ over sample, has profile that 79.8% entire (98% region-of-interest). A H-type T-junction waveguide coupler inductive obstacles introduced increases dynamic range movable short while reducing frequency shift by 43% during over-coupling. assembly fabricated tested both on bench EPR experiments. This provides template improve spectroscopy pulse experiments at high frequencies.