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Abstract #4424

Switching Impedance Matching and Primary Coil Array Using RF MEMS switches for a Wireless Power Transfer System

Kelly Byron1, Fraser Robb2, Shreyas Vasanawala3, John Pauly1, and Greig Scott1

1Electrical Engineering, Stanford University, Stanford, CA, United States, 2GE Healthcare, Aurora, OH, United States, 3Radiology, Stanford University, Stanford, CA, United States

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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