On the Design of a Multi-Frequency Wireless Power and Data Transfer System

A methodology for the design of a multifrequency Wireless Power transfer (WPT) and data transfer (DT) applications with reduced computational burden, is presented. The configuration is made by an array of passive resonant elements placed in the proximity of the driver coil of a common 2-coils system. The proposed methodology is well-known in phased array design and here adopted for WPT and DT applications. The method is based on one numerical fullwave evaluation of the scattering parameters matrix of a 2-coils system together with a passive resonant array of (N-2) × (N-2) elements, made resonant by tuning capacitors. By a postprocessing evaluation of the S N×N matrix of the system, it can be possible obtaining the desired multiple frequencies tuning of the array by acting only on the tuning post-processed capacitors. We finally demonstrated that the proposed arrangement enhances the efficiency level of the simple 2-coils driver-receiver system at the multiple frequencies obtained by the chosen multi-tuning condition.