Design of Multiple-Receiving WPT System Using Ferrite-Embedded LTCC

Young-Hyun KIM  Dae-Kil PARK  Kyung-Heon KOO  

IEICE TRANSACTIONS on Communications   Vol.E103-B   No.3   pp.247-252
Publication Date: 2020/03/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2019EBP3008
Type of Manuscript: PAPER
Category: Antennas and Propagation
WPT,  magnetic resonance,  LTCC,  ferrite,  

Full Text: FreePDF(5.6MB)

Wireless power transfer (WPT) can be classified into magnetic induction, magnetic resonance, and RF radiation types, of which the magnetic resonance WPT system is especially attracting attention due to its high potential for development. The magnetic resonance system using a specific resonance frequency is applicable to small mobile devices and in-body wireless charging modules because it enables the implementation of single-input multiple-output (SIMO), where the transmitter transmits power to multiple receivers, and the miniaturization of receiving coil. The most important consideration of the magnetic resonance WPT is the optimization of the power transfer distance and efficiency, which requires a precise design and the analysis of the transmission coil. Ferrite-embedded LTCC inductors are more advantageous for WPT applications than coil inductors because of their low cost, batch manufacturing and durability. A coil with the substate size of 10.0×12.0×0.7mm3 was manufactured using the ferrite-embedded LTCC technology to miniaturize the receiver coil. The sum of power transferred from transmitter sized of 80×60mm2 to two receivers is approximately 32%, which indicates a high potential for use in small terminals or in-body modules.