Wireless power transfer (WPT) using magnetic
resonance could provide much convenience and so there has been
much commercial interests on WPT recently. In the near future,
WPT technology is expected to be applied to various electronic
devices with transceiver coils for WPT. The coils in different
electronic devices for WPT, then, could cause interference on
each other. These environments could make a resonance peak for
maximum power to divide into several peaks, and have an effect
on transferred power and electromagnetic interference (EMI).
Therefore, it is needed to measure and analyze various cases for
different number of coils in WPT systems. In this paper, we have
measured a resonance in vertical multi-coupled coils in the case
of tight magnetic coupling. And we have analyzed the transferred
power with respect to resonances of vertical multi-coupled coils.
We also have measured EMI in vertical multi-coupled coils and
analyzed EMI in frequency domain with respect to resonances of
vertical multi-coupled coils for WPT systems.
 
Wireless power transfer (WPT) using magneticresonance could provide much convenience and so there has beenmuch commercial interests on WPT recently. In the near future,WPT technology is expected to be applied to various electronicdevices with transceiver coils for WPT. The coils in differentelectronic devices for WPT, then, could cause interference oneach other. These environments could make a resonance peak formaximum power to divide into several peaks, and have an effecton transferred power and electromagnetic interference (EMI).Therefore, it is needed to measure and analyze various cases fordifferent number of coils in WPT systems. In this paper, we havemeasured a resonance in vertical multi-coupled coils in the caseof tight magnetic coupling. And we have analyzed the transferredpower with respect to resonances of vertical multi-coupled coils.We also have measured EMI in vertical multi-coupled coils andanalyzed EMI in frequency domain with respect to resonances ofvertical multi-coupled coils for WPT systems.
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