Improvement of Magnetic Field for Near-Field WPT System Using Two Concentric Open-Loop Spiral Resonators

Mohamed Aboualalaa, Islam Mansour, Adel Barakat, Kuniaki Yoshitomi, Ramesh K. Pokharel

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

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 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.

Original languageEnglish
Article number9173565
Pages (from-to)993-996
Number of pages4
JournalIEEE Microwave and Wireless Components Letters
Volume30
Issue number10
DOIs
Publication statusPublished - Oct 2020

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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