Abstract

Here in this paper we propose an approach to investigate the coupling mechanism of different RF coil elements based on characteristic mode analysis. The coil element with lumped-element-connection to the shielding plate focuses the magnetic field below the strip-line due to a loop current from the dominant mode. Denoted by a negative characteristic mode eigenvalue, the coil element without direct connection to the shielding plate behaves more like an electric dipole and the field is distributed mainly above the strip-line. A compromise between these two scenarios which suffers neither from the field below nor above the strip-line achieves an optimal decoupling. FDTD simulation and experimental measurement confirmed the conclusion from characteristic mode analysis.

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