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Impedance matching in magnetic-coupling-resonance wireless power transfer for small implantable devices

In this paper, we present an impedance matching technique in magnetic-coupling-resonance wireless power transfer system for small implantable medical devices. By developing an equivalent circuit model of the WPT system, we show that impedance matching can be realized. Electromagnetic field simulations demonstrated that our proposed technique has capability of achieving maximum input power and available efficiency without using impedance matching circuits.