A Self-tracked High-dielectric Wireless Power Transfer System for Neural Implants

This paper introduces a novel, efficient and long-range ( 0.5λ) wireless power transfer system for implantable neural devices. The operating principle of this system is based on the high-dielectric coupling, which occurs between an external lossless high-dielectric metamaterial (permittivity, ε
_r
=100, loss tangent, tanδ = 0.0001) and lossy dielectric such as rat (ε
_r
=54.1, conductivity, σ = 1.5 S/m). As magnetic field coupling occurs between two dielectric resonators, therefore, the rat (lossy dielectric) itself acts as a self-tracking energy source. The Ansoft HFSS simulation software was used to verify the concept. Initially, the rat was modelled as a phantom box and the resonant frequency was found to be 1.5 GHz. Then, for matching this intrinsic mode of the rat model, the external high-dielectric metamaterial designed accordingly to realize a highly efficient (η = 1×10
^-3
) and self-tracked wireless power system for neural implants.