Design Methodology of a Printed WPT System for HF-Band HF Band Mid-Range Mid Applications Considering Human Safety Regulations
Abstract: A methodology for the design of printed magnetically coupled resonant wireless power-transfer transfer (WPT) systems is proposed. The design methodology aims at a well-matched matched system with a maximized power power-transfer transfer efficiency for mid-range mid applications. The system consists of two identical resonant coils driven by high highquality factor loops. The proposed design criteria allows obtaining maximum achievable transfer efficiency and impedance matching at any defined distance without any external matching circuits connected connected to the driven loops. For validation purposes, a printed WPT system at 10 MHz is fabricated targeting 1-m 1 distance between the transmitting and receiving sides. Its performances in terms of reflection and transmission coefficients, as well as in terms of generated electric and magnetic fields, have been characterized numerically and experimentally. The impact of human body presence on the system has also been investigated observing the splitting in two frequencies of the common resonant frequency of the coils. oils. A dosimetric study has been conducted using a detailed high-resolution resolution anatomical human body model and considering E99, J1 cm2, and specific absorption rate (SAR) (local and whole body averaged SAR) as exposure metrics. It has been observed that peak exposure levels appear in different tissues depending on the body location. Compliance with the international commission on nonionizing radiation protection (ICNIRP) reference level as well as basic