We propose a theoretical model predicting the Signal-to-Noise Ratio (SNR) of dielectric antennas for Magnetic Resonance Imaging. The SNR is estimated with a semi-analytical approach describing the first transverse electric mode of a high-permittivity ring resonator. When the ring is properly excited with a feeding loop, it induces a strong magnetic field in the sample while dielectric losses are limited due to low electric field intensity in this region. The proposed model is validated with numerical simulations regarding microscopy applications and its prediction confirmed experimentally at 17.2 T.
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