Wireless power transfer (WPT) inside the MRI bore, as part of completely wireless patient coils, should have minimal RF interactions and be a compact system that allows for flexible placement of the coils while maintaining power transfer efficiency. Changes in coil positions can drastically reduce power amplifier efficiency. Here we present a MEMS based auto-tuning approach to compensate for the varying load seen by the power amplifier. An array primary coils also using high-power RF MEMS devices to steer power to a local secondary coil is also demonstrated.
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