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Title: Unidirectional wireless power transfer using near-field plates

Abstract

One of the obstacles preventing wireless power transfer from becoming ubiquitous is their leakage of power: high-amplitude electromagnetic fields that can interfere with other electronic devices, increase health concerns, or hinder power metering. In this paper, we present near-field plates (NFPs) as a novel method to tailor the electromagnetic fields generated by a wireless power transfer system while maintaining high efficiency. NFPs are modulated arrays or surfaces designed to form prescribed near-field patterns. The NFP proposed in this paper consists of an array of loaded loops that are designed to confine the electromagnetic fields of a resonant transmitting loop to the desired direction (receiving loop) while suppressing fields in other directions. The step-by-step design procedure for this device is outlined. Two NFPs are designed and examined in full-wave simulation. Their performance is shown to be in close agreement with the design predictions, thereby verifying the proposed design and operation. A NFP is also fabricated and experimentally shown to form a unidirectional wireless power transfer link with high efficiency.

Authors:
 [1]
  1. Radiation Laboratory, Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, Michigan 48109 (United States)
Publication Date:
OSTI Identifier:
22410187
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 18; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMPLITUDES; COMPUTERIZED SIMULATION; DESIGN; EFFICIENCY; ELECTROMAGNETIC FIELDS; ELECTRONIC EQUIPMENT; OPERATION; PERFORMANCE; PLATES; POWER TRANSMISSION; SURFACES

Citation Formats

Imani, Mohammadreza F., E-mail: mohamad.imani@gmail.com, and Grbic, Anthony. Unidirectional wireless power transfer using near-field plates. United States: N. p., 2015. Web. doi:10.1063/1.4919842.
Imani, Mohammadreza F., E-mail: mohamad.imani@gmail.com, & Grbic, Anthony. Unidirectional wireless power transfer using near-field plates. United States. https://doi.org/10.1063/1.4919842
Imani, Mohammadreza F., E-mail: mohamad.imani@gmail.com, and Grbic, Anthony. 2015. "Unidirectional wireless power transfer using near-field plates". United States. https://doi.org/10.1063/1.4919842.
@article{osti_22410187,
title = {Unidirectional wireless power transfer using near-field plates},
author = {Imani, Mohammadreza F., E-mail: mohamad.imani@gmail.com and Grbic, Anthony},
abstractNote = {One of the obstacles preventing wireless power transfer from becoming ubiquitous is their leakage of power: high-amplitude electromagnetic fields that can interfere with other electronic devices, increase health concerns, or hinder power metering. In this paper, we present near-field plates (NFPs) as a novel method to tailor the electromagnetic fields generated by a wireless power transfer system while maintaining high efficiency. NFPs are modulated arrays or surfaces designed to form prescribed near-field patterns. The NFP proposed in this paper consists of an array of loaded loops that are designed to confine the electromagnetic fields of a resonant transmitting loop to the desired direction (receiving loop) while suppressing fields in other directions. The step-by-step design procedure for this device is outlined. Two NFPs are designed and examined in full-wave simulation. Their performance is shown to be in close agreement with the design predictions, thereby verifying the proposed design and operation. A NFP is also fabricated and experimentally shown to form a unidirectional wireless power transfer link with high efficiency.},
doi = {10.1063/1.4919842},
url = {https://www.osti.gov/biblio/22410187}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 18,
volume = 117,
place = {United States},
year = {Thu May 14 00:00:00 EDT 2015},
month = {Thu May 14 00:00:00 EDT 2015}
}