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Internal Power Loss Formulas of LumpedElement Matching Circuits for HighEfficiency Wireless Power Transfer
Kyohei YAMADA Naoki SAKAI Takashi OHIRA
Publication
IEICE TRANSACTIONS on Electronics
Vol.E99C
No.10
pp.11821189 Publication Date: 2016/10/01 Online ISSN: 17451353
DOI: 10.1587/transele.E99.C.1182 Type of Manuscript: Special Section PAPER (Special Section on Microwave and MillimeterWave Technology) Category: Keyword: wireless power transfer, impedance matching, Q factor, internal loss, formulation,
Full Text: PDF(541.5KB)>>
Summary:
Internal power losses in lumpedelement impedance matching circuits are formulated by means of Q factors of the elements and port impedances to be matched. Assuming that Q factors are relatively high, the above mentioned loss is expressed by a simple formula containing only the tangents of the impedances. The formula is a powerful tool for such applications that put emphasis on power efficiency as wireless power transfer. As well as the formulation, we illustrate some design examples with the derived formula: design of the least lossy Lsection circuit and twostage lowpass ladder. The examples provide readytouse knowledge for lowloss matching design.

