Staff Members - Benha University
Improvement of Magnetic Field for Near-Field WPT System Using Two Concentric Open-Loop Spiral Resonators
IEEE Microwave and Wireless Components Letters • 2020
Publication Information
Authors
Mohamed Aboualalaa , Islam Mansour, Adel Barakat ,
Kuniaki Yoshitomi, and Ramesh K. Pokharel
Keywords
Capacitive coupling feeding, charging distance,
near-field wireless power transfer (WPT), open-loop spiral resonator
(OLSR), power transfer efficiency (PTE).
Journal
IEEE Microwave and Wireless Components Letters
Publisher
IEEE
Volume
Not Available
Issue
Not Available
Pages
1-4
publication.type
International
Paper Link
Open Link
Supplementary Materials
Not Available
Abstract
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- 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.
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- 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.