TY - JOUR
T1 - Design and implementation of dual-mode inductors for dual-band wireless power transfer systems
AU - Barakat, Adel
AU - Yoshitomi, Kuniaki
AU - Pokharel, Ramesh K.
N1 - Funding Information:
Manuscript received September 3, 2018; revised November 8, 2018; accepted November 24, 2018. Date of publication November 27, 2018; date of current version July 30, 2019. This work was supported in part by VLSI Design and Education Center (VDEC), the University of Tokyo in collaboration with Keysight Corporation. This brief was recommended by Associate Editor S. C. Wong. (Corresponding author: Adel Barakat.) A. Barakat is with the Center for Japan–Egypt Cooperation in Science and Technology, Kyushu University, Fukuoka 819-0385, Japan, and also with the Microstrip Circuits Department, Electronics Research Institute, Giza 12622, Egypt (e-mail: adel.barakat@ejust.kyushu-u.ac.jp).
Publisher Copyright:
© 2004-2012 IEEE.
PY - 2019/8
Y1 - 2019/8
N2 - We propose a dual-band wireless power transfer (WPT) system employing a dual-mode inductor. The dual-mode inductor is possible through enforcing a self-resonance condition by loading an inductor in series by a tank circuit. In return, two distinct resonances are achieved, simultaneously, utilizing a single compensation capacitor as the inductance of the dual-mode inductor appears with a smaller value after its self-resonance. Also, by maintaining the same mutual coupling, the coupling coefficient becomes larger at the higher resonance, which allows for the employment of the same source/load admittance inversion network to achieve maximum power transfer at both of the operating frequency bands, concurrently. We verify the operation by fabricating a dual-band WPT system, which shows measured efficiencies of 70% and 69% at 90.3 MHz and 138.8 MHz, correspondingly. The size of the WPT system is \boldsymbol {50} \boldsymbol {\times } \boldsymbol {50} mm ^{\boldsymbol {2}} and has a transfer distance of 40 mm.
AB - We propose a dual-band wireless power transfer (WPT) system employing a dual-mode inductor. The dual-mode inductor is possible through enforcing a self-resonance condition by loading an inductor in series by a tank circuit. In return, two distinct resonances are achieved, simultaneously, utilizing a single compensation capacitor as the inductance of the dual-mode inductor appears with a smaller value after its self-resonance. Also, by maintaining the same mutual coupling, the coupling coefficient becomes larger at the higher resonance, which allows for the employment of the same source/load admittance inversion network to achieve maximum power transfer at both of the operating frequency bands, concurrently. We verify the operation by fabricating a dual-band WPT system, which shows measured efficiencies of 70% and 69% at 90.3 MHz and 138.8 MHz, correspondingly. The size of the WPT system is \boldsymbol {50} \boldsymbol {\times } \boldsymbol {50} mm ^{\boldsymbol {2}} and has a transfer distance of 40 mm.
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U2 - 10.1109/TCSII.2018.2883671
DO - 10.1109/TCSII.2018.2883671
M3 - Article
AN - SCOPUS:85057802526
SN - 1549-7747
VL - 66
SP - 1287
EP - 1291
JO - IEEE Transactions on Circuits and Systems II: Express Briefs
JF - IEEE Transactions on Circuits and Systems II: Express Briefs
IS - 8
M1 - 8546792
ER -