Research Article

Investigation of Improved Methods in Power Transfer Efficiency for Radiating Near-Field Wireless Power Transfer

Figure 20

Efficiency of the considered WPT systems. Five different systems are considered: case : classical WPT system (single source; optimum frequency for maximum efficiency); case : retriever-based system (single source; optimum frequency and for maximum efficiency); case : WPT system with two transmitters based on the optimum of retriever-based system (two sources; optimum frequency, distance , phase difference and voltage ratio for maximum efficiency); case : (two sources; optimum frequency, phase 2 āˆ’ phase 1 = 0 and = 1 for maximum efficiency); case : ā€‰m (two sources; optimum frequency, phase difference, and voltage ratio for maximum efficiency).