Parallel-Plate Waveguide for Subject-Insensitive RF Transmission
Hai Lu 1 and Shumin Wang 1
Auburn University, Auburn, AL, United States
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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