Electromagnetic interferences susceptibility analysis for a metasurface-modified wireless power transfer system

The use of magnetic metasurfaces in Wireless Power Transfer systems is becoming a popular research topic: they have proven to be a valid approach to increase the performances (in terms of power transfer) and improve the overall EMC properties in terms of field emissions. In this contribution, the authors investigate the susceptibility of such systems in case of an impinging Electromagnetic Interference (that might also be intentional), evaluating different parameters for a selected set of the system's components. In particular, the worst-case scenarios of voltage peak, energy and sharpness (where appliable) at the transmitting and receiving ports and at each capacitor of the metasurface are calculated. The results obtained for a specific system practically implemented in the lab, show that the metasurface does not necessarily decreases susceptibility towards EMI and it can be itself the most critical component. The identification of the key and critical parameters allows us to provide an insight on how metamaterials used as shielding devices should be properly designed.