A novel structure for size-reduction of artificial magnetic conductor surface was designed for 9.4T MRI, aiming to improve the transmit efficiency of RF coils. This design achieved great miniaturization of the EBG unit cell size, which has been reduced to 4.48% of free-space wavelength. The reflection phase coefficient and the dispersion diagram are employed to characterize the EBG structure performance. Compared with a conventional metallic RF shielding plate, full-wave simulation results suggest that the proposed structure can achieve improved transmit efficiency.
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