Abstract
Wireless Power Transfer (WPT) system in accordance with Qi standards and NFC-RFID system is being loaded to the smart phone in recent years. However, the transmission efficiency of WPT system and communication distance of NFC system is greatly deteriorated due to nearby metal objects. To solve this problem, magnetic sheet with high permeability is inserted between these antenna and metal objects. In order to make thickness of these materials thinner, adopting the amorphous magnetic sheet is considered. However, also the amorphous sheet has large magnetic loss, and it cuts both ways. Accordingly, the effective loading method that can strike balance between the high permeability property use and magnetic loss suppression for the amorphous sheet is reported in this paper.
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