TY - JOUR
T1 - Improvement of Magnetic Field for Near-Field WPT System Using Two Concentric Open-Loop Spiral Resonators
AU - Aboualalaa, Mohamed
AU - Mansour, Islam
AU - Barakat, Adel
AU - Yoshitomi, Kuniaki
AU - Pokharel, Ramesh K.
N1 - Funding Information:
Manuscript received June 18, 2020; accepted August 7, 2020. Date of publication August 21, 2020; date of current version October 7, 2020. This work was supported in part by Progress 100 (Invitation program for top global researchers) and in part by the VLSI Design and Education Center (VDEC), University of Tokyo, in collaboration with Keysight Corporations. (Corresponding author: Mohamed Aboualalaa.) Mohamed Aboualalaa is with the Microstrip Department, Electronics Research Institute, Giza 12622, Egypt, and also with the Graduate School of Information Science and Electrical Engineering, Kyushu University, Fukuoka 819-0385, Japan (e-mail: mohamed.ali@ejust.edu.eg).
Publisher Copyright:
© 2020 IEEE.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/10
Y1 - 2020/10
N2 - This letter introduces two concentric open-loop spiral resonators (OLSRs) that are used to improve magnetic field for nonradiative wireless power transfer (WPT) systems. OLSRs are fed through metal-insulator-metal (MIM) capacitive coupling using a 50 Ω microstrip transmission line. First, a single OLSR is designed and implemented for WPT, then two OLSRs are used instead of a single OLSR to emphasize the surface current on the spiral resonators. Therefore, it helps to intensify the electromagnetic field in order to get a high transmission distance or higher efficiency. The proposed WPT system operates at 438.5 MHz with a measured power transfer efficiency (PTE) of 70.8% at a transmission distance of 31 mm and a design area of 576 mm2. An equivalent circuit of the proposed WPT system is presented as a heuristic approach to show the electrical behavior of the WPT system.
AB - This letter introduces two concentric open-loop spiral resonators (OLSRs) that are used to improve magnetic field for nonradiative wireless power transfer (WPT) systems. OLSRs are fed through metal-insulator-metal (MIM) capacitive coupling using a 50 Ω microstrip transmission line. First, a single OLSR is designed and implemented for WPT, then two OLSRs are used instead of a single OLSR to emphasize the surface current on the spiral resonators. Therefore, it helps to intensify the electromagnetic field in order to get a high transmission distance or higher efficiency. The proposed WPT system operates at 438.5 MHz with a measured power transfer efficiency (PTE) of 70.8% at a transmission distance of 31 mm and a design area of 576 mm2. An equivalent circuit of the proposed WPT system is presented as a heuristic approach to show the electrical behavior of the WPT system.
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U2 - 10.1109/LMWC.2020.3016136
DO - 10.1109/LMWC.2020.3016136
M3 - Article
AN - SCOPUS:85092493292
SN - 1531-1309
VL - 30
SP - 993
EP - 996
JO - IEEE Microwave and Wireless Components Letters
JF - IEEE Microwave and Wireless Components Letters
IS - 10
M1 - 9173565
ER -