In this work, we propose a novel “bump” design to further improve the coil robustness versus loadings. For the loop-mode self-decoupled coil, the rotating magnetic field (composed of Bx and By) and electric field are mainly determined by the feed and arm conductors; the frequency shift that decreases coil robustness is mainly caused by the conductor with small-valued mode capacitors (referred to as mode conductor for short). Therefore, a bumped coil with a spaced mode conductor but unchanged arm and feed conductors potentially provides more robust tuning/matching performance without decreasing coil efficiency.
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