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The increasing sophisticated power and communication demands have motivated a variety of research on simultaneous wireless information and power transfer system, aiming to provide higher power transfer efficiency and improved communication rate. This paper demonstrates that resonant wireless power transfer (RWPT) system with relays can be a candidate to reach these aims. Based on coupled resonator filter theory, mathematical equations for transmission efficiency and bandwidth are derived fordoi:10.2528/pierl15091404 fatcat:7tai6mv43jgn7o4bgh2mazwwvi