Abstract
A metamaterial-inspired efficient electrically small antenna is proposed, firstly. And then several improving power transfer efficiency (PTE) methods for wireless power transfer (WPT) systems composed of the proposed antenna in the radiating near-field region are investigated. Method one is using a proposed antenna as a power retriever. This WPT system consisted of three proposed antennas: a transmitter, a receiver, and a retriever. The system is fed by only one power source. At a fixed distance from receiver to transmitter, the distance between the transmitter and the retriever is turned to maximize power transfer from the transmitter to the receiver. Method two is using two proposed antennas as transmitters and one antenna as receiver. The receiver is placed between the two transmitters. In this system, two power sources are used to feed the two transmitters, respectively. By adjusting the phase difference between the two feeding sources, the maximum PTE can be obtained at the optimal phase difference. Using the same configuration as method two, method three, where the maximum PTE can be increased by regulating the voltage (or power) ratio of the two feeding sources, is proposed. In addition, we combine the proposed methods to construct another two schemes, which improve the PTE at different extent than classical WPT system.
Highlights
Research and engineering application for wireless power transmission (WPT) technology has been achieved much attention since the first WPT experiments were carried out by Tesla in the early 20th century [1, 2]
It is clear that the use of retriever, phase difference, and voltage ratio adjusting allows one to overcome the monotonic decay in efficiency observed in classical WPT
The classical WPT system, retriever-based system and system with two transmitters fixed at Dt = 0.8 m, phase difference, and voltage ratio optimized for each separation D that have been discussed separately in the previous paragraph are considered here
Summary
Research and engineering application for WPT technology has been achieved much attention since the first WPT experiments were carried out by Tesla in the early 20th century [1, 2]. Using resonant coupling for WPT in the coupled mode near-field region, very high PTE can be achieved. The optimal load impedance [15,16,17], and the resonant frequency and the input impedance of the transmitter are influenced by antenna spacing [11, 12, 18] It makes difficulty for design of an optimal scheme in the coupled mode nearfield region [17]. The proposed antenna is shown to be well matched to a 50 Ω source The purpose of this design is to obtain high PTE in radiating near-field region with the 50 Ω optimal load impedance. The performance of the proposed antenna and WPT systems are characterized with FEldberechnung fur Korper mit beliebiger Oberflache (FEKO)
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