13-08 – New Techniques for Highly Efficient Near Field Wireless Power Transfer System

Several studies have shown the potential of good power coupling between electromagnetically resonant antenna structures in the near field for wireless power transfer (WPT); however, there is still much work to be done. Researchers at Kansas State University have realized this need and have concentrated on developing the most critical stage in WPT, that is, the transmitting and receiving antennas making up the wireless link. K-State researchers have designed a system comprised of a ground plane and new grounding techniques to yield higher transfer power and efficiency. This system uses resonant non-radiative near field coupling for wireless transmission of electromagnetic energy between two antennas tuned to resonate at similar frequencies. Two different ground schemes have been demonstrated and the results show increased wireless power transfer efficiencies up to 60% for larger distances than previously observed. This system is capable of providing different coupling efficiencies depending on the scheme used. Lindsay Biggs-Gragg biggsl@ksu.edu 785-395-0901