Complex conjugate matching technique for wireless power transfer with multiple inductive coupled resonators

Abstract

In this article, a complex conjugate matching problem for the case that additional resonator is mutually inductive coupled with transmitting and receiving resonators is discussed. To deliver wireless power from source to load with maximum efficiency, it is important that the source and the load impedances are fully matched. However, if an additional resonator is inserted to reconfigure the initial system characteristics, a mutually inductive coupling takes place and influences both the transmitting and the receiving resonators. The inductive coupling makes the impedance matching hard, resulting in a difficulty for getting the maximum transfer efficiency at the target frequency. Thus, a generalized impedance matching according to the complex mutual inductance to get maximum transfer efficiency is proposed. To verify the result, an experiment with multiple coils is conducted and analyzed. (c) 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2291-2294, 2016