Investigation of Wireless Power Transfer Using Planarized, Capacitor-Loaded Coupled Loops
A capacitor-loaded coupled loop structure is investigated for wireless power transfer at 6.78MHz for a target transmission distance of 1m. It is shown that the optimal configuration for this structure occurs when the coupled loops are coplanar. Therefore, by converting thick wires into wide strips, a planarized configuration can be achieved. Simulation results are verified in measurement, which shows a 60% overall power transfer efficiency at 1m. The contribution of different loss mechanisms is examined. Next, power transfer efficiency in the presence of dielectric materials is investigated in simulation and measurement. Additionally, tuning capabilities that arise from the implementation of variable capacitors are shown.