Design of miniaturized high frequency printed coils for wireless power transfer to biomedical implants

Multi-turn, multi-stranded, dual layer microfabricated planar spiral coils with interlayer offset are proposed for improved wireless power transfer efficiency and miniaturization of biomedical implants. Multi-stranding coupled with an interlayer offset, enables implanted coils to operate at higher frequencies due to quality factor improvements. This ultimately leads to miniaturization of overall implant size. Simulation results show a quality factor improvement of 72% at 13.56 MHz in a tissue equivalent phantom.