Impact of the Characteristic Impedance of Coaxial Lines on the Sensitivity of a 750-MHz Electronically Tunable EPR Resonator

• Nakaoka, Ririko

• Komarov, Denis A.

• Matsumoto, Shingo

• Hirata, Hiroshi

Abstract

A 750-MHz electronically tunable resonator was investigated in terms of the sensitivity of electron paramagnetic resonance (EPR) signal detection. The conversion efficiency of the radio-frequency magnetic field was calculated for resonators with 50- and 100-Omega coaxial coupling lines using three-dimensional (3D) microwave field and microwave circuit simulators. Based on the simulation results, two tunable resonators were physically constructed and compared in terms of EPR signal sensitivity using a nitroxyl radical solution. While the resonator with 100-Omega coaxial lines provided 14% greater signal intensity, its signal-to-noise ratio was lower than that of the resonator with 50-Omega lines. To demonstrate the capability of the constructed tunable resonator for EPR imaging experiments, a solution of nitroxyl radical and the leg of a tumor-bearing mouse were visualized.

Journal

• Applied magnetic resonance

  Applied magnetic resonance 49 (8), 853-867, 2018-08

  Springer

Details

• CRID: 1050001339062325504
• NII Article ID: 120006709282
• NII Book ID: AA10933363
• HANDLE: 2115/75089
• ISSN: 09379347
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • CiNii Articles