Compact design for wireless power transmission using U-slot resonators with folded coupled lines

In this work, a new compact wireless power transfer (WPT) system is proposed. This system is used for short-range WPT using two compact size folded U-slot resonators with a pair of coupled lines folded inside resonator through an electromagnetic resonant coupling. This proposed design enables us to achieve power transfer efficiency of 77.6% with separating distance of 10 mm and operates at 1 GHz. Simulation results and theoretical studies have shown good agreement with the measurements.