CAD of wireless resonant energy links (WREL) realized by coils

Electromagnetic wireless resonant energy links (WREL) can also be realized by using resonant coils coupled via their evanescent fields. In this paper we propose a new structure for wireless power transfer and illustrate the similarities and the differences of CAD of wireless power transfer with resonant coils and RFID working at 13.56 MHz. An experimental set-up for wireless power transfer with resonant coils is realized and its equivalent network, working both in frequency and time-domain, is extracted. Relevant excitation and Q-factor differences between RFID, which are used for information exchange, and WREL, which are designed for energy transfer, are discussed.