Alternately Coupled Magnetoinductive Waveguide with Nulls-Free Characteristic for Two-Way Wireless Power Transfer Application

Two-way alternately coupled magnetoinductive waveguide for wireless power transfer is presented in this paper. With the use of the alternate coupling polarities between consecutive resonator cells and quadrature phase termination at the last cell, the nulls-free characteristics were clearly achieved for all locations. The power is transferred to a single receiver with 74% from the input power. For two receivers placed separately on each path, a small variation of power transfer percentage ranging from 40% to 43% is obtained. Finally, the proposed configuration model can be developed to power and charge multiple electronic devices, robots and EVs without nulling effect.