Performance analysis of planar microcoils for biomedical wireless power transfer links

摘要

Planar microcoils are significant components of inductive devices used for biomedical wireless power transfer applications. Biomedical devices implanted inside the human body needs to be powered up at regular intervals which can be done electromagnetically through a planar microcoils’ setup. Different types ofplanar microcoils such as spiral and non-spiral planar microcoils are compared in this work in terms of their electrical parameters. An analytical model is also developed which is validated using experimental results. The fabrication advantages and low power dissipation of non-spiral coil structures make them a strong alternative for conventional spiral planar coils. Though the magnitude of magnetic flux density is slightly lesser for non-spiral coils, series resistance required for wireless power link is found to be better for the same. The fabrication of nonspiral planar microcoils of various geometries is shown using a single mask level. Coupling factors of various wireless power links are also simulated using different non-spiral planar microcoil geometries to select the optimum geometry for the wireless power link application.