A 13.56 MHz Inductive Wireless Power Transfer System for Active Implantable Medical Devices

This work presents the design, simulation, and experimental validation of a 13.56 MHz Inductive Wireless Power Transfer (IWPT) system for next-generation Active Implantable Medical Devices (AIMDs). The proposed architecture integrates optimized planar spiral coils (PSCs), a high-efficiency Class E amplifier, and a passive voltage doubler rectifier. Electromagnetic simulations guided coil geometry selection, targeting high efficiency in compact biomedical form factors. Prototypes were fabricated and validated under realistic misalignment conditions, achieving an output power of 87 mW and an end-to-end Power Transfer Efficiency (PTE) of 56.5% at 10 mm separation. This combination of simulation-driven design, robust experimental performance, and tolerance to misalignment demonstrates the suitability of the system for reliable, battery-free AIMDs, addressing critical needs in surgical safety and device miniaturization.