Optimization and Robustness Analysis of a Spiral Resonators Array for Misalignment Recovering purposes in WPT Systems

The aim of the manuscript is to present a feasibility analysis for misalignment recovering purposes in a two coils Wireless Power Transfer system with the presence of a Spiral Resonators Array. The misalignment is faced by opportunely varying the values of capacitive loads with an ad-hoc optimization procedure. In a previous work, the authors have already presented a methodology able to compensate the system efficiency drop by applying a postprocessing approach based on an S-parameters matrix circuit representation of the entire system, and by changing the values of the capacitors which opportunely load each element of the SRA structure. Here, an optimization procedure followed by a Montecarlo method have been used in order to investigate the effect of the components tolerances and the sensitivity of the system. In this way, a more realistic modelization can be accomplished, guiding the designer to the realization of a more robust system.