Internal Power Loss Formulas of Lumped-Element Matching Circuits for High-Efficiency Wireless Power Transfer

Kyohei YAMADA; Naoki SAKAI; Takashi OHIRA

doi:10.1587/transele.E99.C.1182

Internal Power Loss Formulas of Lumped-Element Matching Circuits for High-Efficiency Wireless Power Transfer

Kyohei YAMADA, Naoki SAKAI, Takashi OHIRA

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Internal power losses in lumped-element 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 L-section circuit and two-stage low-pass ladder. The examples provide ready-to-use knowledge for low-loss matching design.

Publication: IEICE TRANSACTIONS on Electronics Vol.E99-C No.10 pp.1182-1189

Publication Date: 2016/10/01

Publicized

Online ISSN: 1745-1353

DOI: 10.1587/transele.E99.C.1182

Type of Manuscript: Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)

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Authors

Kyohei YAMADA
  Toyohashi University of Technology
Naoki SAKAI
  Toyohashi University of Technology
Takashi OHIRA
  Toyohashi University of Technology

Keyword

wireless power transfer, impedance matching, Q factor, internal loss, formulation

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Kyohei YAMADA, Naoki SAKAI, Takashi OHIRA, "Internal Power Loss Formulas of Lumped-Element Matching Circuits for High-Efficiency Wireless Power Transfer" in IEICE TRANSACTIONS on Electronics, vol. E99-C, no. 10, pp. 1182-1189, October 2016, doi: 10.1587/transele.E99.C.1182.
Abstract: Internal power losses in lumped-element 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 L-section circuit and two-stage low-pass ladder. The examples provide ready-to-use knowledge for low-loss matching design.
URL: https://globals.ieice.org/en_transactions/electronics/10.1587/transele.E99.C.1182/_p

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@ARTICLE{e99-c_10_1182,
author={Kyohei YAMADA, Naoki SAKAI, Takashi OHIRA, },
journal={IEICE TRANSACTIONS on Electronics},
title={Internal Power Loss Formulas of Lumped-Element Matching Circuits for High-Efficiency Wireless Power Transfer},
year={2016},
volume={E99-C},
number={10},
pages={1182-1189},
abstract={Internal power losses in lumped-element 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 L-section circuit and two-stage low-pass ladder. The examples provide ready-to-use knowledge for low-loss matching design.},
keywords={},
doi={10.1587/transele.E99.C.1182},
ISSN={1745-1353},
month={October},}

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TY - JOUR
TI - Internal Power Loss Formulas of Lumped-Element Matching Circuits for High-Efficiency Wireless Power Transfer
T2 - IEICE TRANSACTIONS on Electronics
SP - 1182
EP - 1189
AU - Kyohei YAMADA
AU - Naoki SAKAI
AU - Takashi OHIRA
PY - 2016
DO - 10.1587/transele.E99.C.1182
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E99-C
IS - 10
JA - IEICE TRANSACTIONS on Electronics
Y1 - October 2016
AB - Internal power losses in lumped-element 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 L-section circuit and two-stage low-pass ladder. The examples provide ready-to-use knowledge for low-loss matching design.
ER -