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To increase the transmission distance of Wireless Power Transfer (WPT)systems, we provide guidelines on choosing the optimal location of anIntermediate Coil with respect to size within a standard five-coil axiallyaligned experimental setup. From our results, for maximum magnitude of S21 atthe resonant frequency we found the optimal location to exist where thecoupling coefficient between the Transmitter and the Intermediate Coil and thecoupling coefficient between the Receiver and the Intermediate Coil areidentical. Additionally, the optimal outer diameter for the maximum magnitudeof S21 at the resonant frequency of the Intermediate Coil in the givensymmetric and asymmetric setup are found to be larger than both TX and RX.

The Optimal Location and Size of an Intermediate Coil in a Magnetic Resonant Coupling Wireless Power Transfer System