Plenary Talks

Plenary Talks 2

The Past, Present, and Future of Wireless Power Transfer Technology: EM point of view

About the presenter

Sangwook Nam

Sangwook Nam

Seoul National University


1986.8 - 1989.5 The University of Texas, Austin, U.S.A.

Ph.D in Electrical Engineering majoring microwave fields theory

1981.3 - 1983.2  Korea Advanced Institute of Science and Technology, Seoul, KOREA

M.S. in Electrical Engineering

1977.3 - 1981.2  Seoul National University, Seoul, KOREA

B.S. in Electronics Engineering


2000.4 - present   professor, Seoul National University, Seoul, KOREA
2001.1 – 2001.12   Visiting scholar, UC, SanDiego, USA
1994.10 - 2000.3   Associate professor, Seoul National University, Seoul, KOREA
1990.2 - 1994.9    Assistant professor, Seoul National University, Seoul, KOREA
1989.9 - 1990.1    Chief research engineer, GoldStar Precision Co. Ltd., KOREA
1983.3 - 1986.8    Research engineer, GoldStar Central Research Laboratory, KOREA


In this talk, I would like to review the history of the theory and the development of Wireless Power Transfer in the electromagnetic point of view. After a brief introduction of the history of WPT, a typical architecture of WPT system will be explained together with the components and the technologies involved. The talk will focus on the EM point of view of WPT after the standard activities related with various WPT technologies are briefly addressed. The operation principle and the limitation of the inductive coupling and the resonant coupling WPT will be described by using the coupled mode theory, the equivalent circuit approach, and the spherical mode theory. In addition, the optimum power transfer conditions and the maximum power transfer efficiency for the radiative near field WPT and the far field WPT will be explained by using the reciprocity theorem and the convex optimization technique. The talk will be concluded with the introduction of a futuristic ongoing research activity related to WPT, so called SWIPT (Simultaneous Wireless Information and Power Transfer). It combines the idea of Wireless Power Transfer with the wireless communication systems such as 5G and Sensor Networks, which is expected to overcome the limit of battery lifetime of IoT.

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