Summary
International Symposium on Antennas and Propagation
2012
Session Number:2E2
Session:
Number:2E2-1
Consideration of Use of Arrayed Transmitting Coils in Wireless Power Transfer with Magnetically Coupled Resonance
Keishi Miwa, Junya Kaneda, Nobuyoshi Kikuma, Hiroshi Hirayama, Kunio Sakakibara,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
Recently, the research and development on wireless power transfer(WPT) attracts our attention because the WPT system enables us to charge cellular phones, notebook computers and electrical vehicles wirelessly. One of the problems in the WPT with magnetically coupled resonance is a decrease in transmitting efficiency due to a misalignment of the receiving coil to the transmitting coil. Unfortunately, this problem is supposed to become more serious because of the miniaturization of electronic equipments. In this paper, we attempt to obtain high transmitting efficiency which does not depend on the position of the receiving coil. For the purpose, we propose here to use the array of three transmitting coils spaced in one dimension, and the transmitting efficiency is analyzed with an electromagnetic field simulator based on the Method of Moments(MoM). Specifically, we examine frequency characteristics of the transmitting efficiency corresponding to the position of the receiving coil in order to show the effectiveness of using the array of the transmitting coils. From the results of computer analysis, it is found that the optimum frequencies exist depending on the position of the receiving coil, and also that the distribution of the magnetic field vector produced by transmitting coils is different depending on the frequency. In addition, it is confirmed that in the case of using arrayed transmitting coils, the effective width where the transmitting efficiency is more than 80% is magnified considerably, and further that using selectively two frequencies expands the effective width quite greatly.