This study investigates a loop-dipole coupling scheme as a new approach to excite orthogonal dielectric modes in a rectangular dielectric resonator antenna for MRI at 7T. A rectangular dielectric resonator antenna was simulated, built and its performance was evaluated in phantom experiments using two coupling schemes: dipole-only and loop-dipole. It was found that the loop-dipole coupling scheme can substantially enhance not only transmit performance of a single element, but also of an array of rectangular dielectric resonator antennas (transmit field efficiency gain of 35%).
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