High-permittivity material (HPM) helmets have provided significant increase in transmit efficiency and local SNR. However, the physical mechanisms that explain such improvements are still not fully explored. In this work, through electromagnetic simulations, we analyze the fields propagation when a loop is placed near the occipital lobe with and without the presence of an HPM helmet. The analysis is performed observing the field propagation through time, the direction and the amplitude of the Poynting vector, and the current density distribution.
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