TL;DR: In this article, a computer-aided design procedure was proposed to reach the maximum efficiency for a given value of the resonators quality factor and for a specified value of coupling (i.e. of the distance between the coils).
Abstract: Electromagnetic Wireless Power Transmission (WREL) can be achieved by using resonant coils coupled via their magnetic fields; these resonant coils must be, in addition, properly coupled to the source and load. By using a simple, yet rigorous, equivalent network, we introduce a computer-aided design procedure to reach the maximum efficiency for a given value of the resonators quality factor and for a specified value of the coupling (i.e. of the distance between the coils). The proposed design procedure provides the matching network values at the input and output sections. A test system is designed, simulated and measured to show the effectiveness of the proposed procedure.
TL;DR: In this paper, a new structure for wireless power transfer with resonant coils and RFID working at 13.56 MHz is proposed and its equivalent network, working both in frequency and time-domain, is extracted.
Abstract: 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.
TL;DR: In this article, the authors present a network-based formulation for studying wireless, mid-range energy links between resonators in free space, which accommodates the analysis of both dielectric resonators and conducting-wire resonant loops.
Abstract: By using the resonant coupling principle two (or more) resonators may exchange energy by means of their evanescent fields thus realizing electromagnetic wireless resonant energy links. We present a network-based formulation for studying wireless, mid-range, energy links between resonators in free-space. The network-based formulation accommodates the analysis of both dielectric resonators and conducting-wire resonant loops.
TL;DR: In this paper, the authors introduce a methodology that allows the simulation of complex structures without the need of full-wave electromagnetic simulations, using a simple network modelling approach, which can be used to simulate complex structures.
Abstract: Electromagnetic wireless resonant energy links (WREL) can be achieved by using resonant coils coupled via their magnetic fields; these resonant coils must be, in addition, properly coupled to the source and load. By using a simple network modelling we introduce a methodology that allows the simulation of complex structures without the need of fullwave electromagnetic simulations.
TL;DR: The optimal designs are investigated for a wireless resonant energy link (WREL) based on a nonradiative magnetic field and it is found that any combination of the efficiency and power supply is possible provided the link is driven over a critical frequency.
Abstract: The optimal designs are investigated for a wireless resonant energy link (WREL) based on a nonradiative magnetic field. Internal resistance of coils is considered in relation to the coil configuration. As a result, the designs are obtained for the transmission efficiency maximum or for the effective power supply maximum. In addition, it is found that any combination of the efficiency and power supply is possible provided the link is driven over a critical frequency.