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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS)
Qi, Cheok Yan
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Control & Systems Engineering Electrical & Electronics Engineering

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Investigation of efficiency and safety in wireless capacitive power transfer through a single-layer tissue phantom Yusop, Yusmarnita; Ngu, Amy Sarah; Qi, Cheok Yan; Asan, N. B.; Husin, Huzaimah; Saat, Shakir; Hoeher, Peter Adam
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 17, No 1: March 2026
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijpeds.v17.i1.pp502-517

Abstract

Wireless power transfer (WPT) is a promising solution for implantable biomedical devices, offering an alternative to traditional implanted batteries and percutaneous connections, which are limited by short lifespans and high infection risks. Existing capacitive power transfer (CPT) systems for biomedical implants often utilize media such as animal meat or liquids to validate power transfer across the human body, but these materials exhibit inconsistent and inaccurate dielectric properties. To address this limitation, this study proposes a CPT system designed to operate with a single-layer tissue phantom that closely mimics the dielectric characteristics of human tissue. The system is integrated with a class-E LCCL resonant topology to enhance power transfer efficiency. In addition to evaluating performance, this work also investigates safety aspects in terms of electric field emission and specific absorption rate (SAR). Simulations using MATLAB Simulink and ANSYS HFSS reveal that at a 1 mm tissue gap, the electric field reaches 298.09 V/m and the SAR is 1.14 W/kg, which are both within established safety limits (614 V/m and 2 W/kg per 10 g of tissue). Furthermore, a 5 W, 1 MHz system operating across a 2 mm tissue gap demonstrates power transfer efficiencies of 40.61% for skin tissue and 20.53% for muscle tissue. These results validate the system’s safety and efficiency for powering deeply implanted biomedical devices.
Co-Authors Asan, N. B. Hoeher, Peter Adam Husin, Huzaimah Ngu, Amy Sarah Shakir Saat Yusop, Yusmarnita