Enhanced PTE and Throughput in Wireless Capacitive Power and Data Transfer via Biocompatible Dielectric Shielding

This study explores the use of biocompatible dielectric shielding to enhance the power transfer efficiency (PTE) and improve the data rates in capacitive links designed for biomedical applications. A dielectric shielding structure that surrounds the capacitive patches on all sides except the main signal path is used to minimize the energy leakage, ensuring high PTE and improved signal-to-noise ratio (SNR). Ex vivo measurements align well with the simulations, showing maximum PTE > 74% for the capacitive link. The link is also capable of supporting data transfer rate exceeding 10 Mbps using a quadrature phase shift keying modulation (QPSK) scheme. These performance metrics represent the highest reported values among tuned capacitive links intended for implantable medical devices.