Parallel-Plate Waveguide for Subject-Insensitive RF Transmission

Conventional RF coils are resonant structures tuned to one or two fixed Larmor frequencies. They are high-Q structures sensitive to different loading conditions. This can be especially problematic for high-field applications where the coil/subject coupling is expected to be much stronger. In order to avoid frequency tuning, a broadband RF coil that utilizes the transverse electromagnetic (TEM) mode of a parallel-plate waveguide was developed. Due to the lack of resonance, it is more stable with respect to different loadings. Furthermore, the same coil can be utilized at distinct frequencies due of the frequency-independent nature of the TEM mode.

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