Impact of Body Tissue on Induced Electromotive Force in Wireless Power Transfer Coils

This paper focuses on numerical calculations of inductive links in wireless power transfer (WPT) systems for medical applications considering body tissue properties. The proposed research provides finite element analysis (FEA) to evaluate the impact of transmission media on the electrodynamics of wireless power transfer systems in biomedical devices. Due to the importance of human health in presence of implantable medical devices and the safety issues, optimal coil design would be crucial. Moreover, knowing the exact values of the equivalent circuit of the inductive link is a major challenge in WPT system design. Also, it is observed that numerical solutions based on electrostatics equations are not sufficient even at few-megahertz applications. In this paper, the design procedure and finite element method results are prepared to propose a comprehension of coil design in wirelessly powered implantable medical devices.