Journal
IEICE TRANSACTIONS ON COMMUNICATIONS
Volume E100B, Issue 8, Pages 1449-1453Publisher
IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
DOI: 10.1587/transcom.2016EBP3416
Keywords
magnetic resonance beamforming; three dimensional beamforming; wireless power transfer (WPT); selective WPT; alignment free WPT
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2015R1A6A1A03031833]
- MSIP (Ministry of Science, ICT and Future Planning, Korea, under the ITRC (Information Technology Research Center) [IITP-2016-R2718-16-0012]
- IITP (National IT Industry Promotion Agency)
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This paper presents a capacitor-loaded 4x4 planar loop array for three-dimensional near-field beamforming of magnetic resonance wireless power transfer (WPT). This planar loop array provides three important functions: beamforming, selective power transfer, and the ability to work alignment free with the receiver. These functions are realized by adjusting the capacitance of each loop. The optimal capacitance of each loop that corresponds to the three functions can be found using a genetic algorithm (GA); the three functions were verified by comparing simulations and measurements at a frequency of 6.78 MHz. Finally, the beamforming mechanism of a near-field loop array was investigated using the relationship between the current magnitude and the resonance frequency of each loop, resulting in the findings that the magnitude and the resonance frequency are correlated. This focused current of the specified loop creates a strong magnetic field in front of that loop, resulting in near-field beamforming.
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