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Magnetic resonance wireless power transfer for laptop computer with a ground plane
Author(s) -
Nguyen Van Thuan,
Kang Seok Hyon,
Jung Chang Won
Publication year - 2017
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.30331
Subject(s) - ground plane , wireless power transfer , electromagnetic coil , electrical engineering , transmitter , acoustics , engineering , microwave , capacitor , plane (geometry) , electronic engineering , physics , telecommunications , geometry , antenna (radio) , mathematics , channel (broadcasting) , voltage
This paper proposes a new method to increase the transfer efficiency of a wireless power transfer (WPT) system, having a source coil, a sprial transmitter (Tx) coil, a load coil and a ground plane, by utilizing the ground plane itself. The creation of cross slits at the ground center and employment of a lumped capacitor on the ground plane transform the ground plane into an additional resonator, which makes the original WPT system work as a 4‐coil WPT system, producing a higher efficiency. By experiment, with an optimized capacitor on the ground plane of C = 2180 pF, the measurement of transfer efficiency shows a maximum improvement of 10% at a transfer distance of 40 cm, compared to the case without the ground plane. The transfer efficiency of the proposed system at transfer distance of 15 cm is 46%. Circuit theory and electromagnetic simulations are employed to analyze the proposed WPT system, giving results consistent with the measured ones. The operating frequency of the proposed system is 6.78 MHz. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:514–521, 2017