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Quasi-Static Magnetic Field Shielding Using Longitudinal Mu-Near-Zero Metamaterials.

Publication ,  Journal Article
Lipworth, G; Ensworth, J; Seetharam, K; Lee, JS; Schmalenberg, P; Nomura, T; Reynolds, MS; Smith, DR; Urzhumov, Y
Published in: Scientific reports
August 2015

The control of quasi-static magnetic fields is of considerable interest in applications including the reduction of electromagnetic interference (EMI), wireless power transfer (WPT), and magnetic resonance imaging (MRI). The shielding of static or quasi-static magnetic fields is typically accomplished through the use of inherently magnetic materials with large magnetic permeability, such as ferrites, used sometimes in combination with metallic sheets and/or active field cancellation. Ferrite materials, however, can be expensive, heavy and brittle. Inspired by recent demonstrations of epsilon-, mu- and index-near-zero metamaterials, here we show how a longitudinal mu-near-zero (LMNZ) layer can serve as a strong frequency-selective reflector of magnetic fields when operating in the near-field region of dipole-like sources. Experimental measurements with a fabricated LMNZ sheet constructed from an artificial magnetic conductor - formed from non-magnetic, conducting, metamaterial elements - confirm that the artificial structure provides significantly improved shielding as compared with a commercially available ferrite of the same size. Furthermore, we design a structure to shield simultaneously at the fundamental and first harmonic frequencies. Such frequency-selective behavior can be potentially useful for shielding electromagnetic sources that may also generate higher order harmonics, while leaving the transmission of other frequencies unaffected.

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Published In

Scientific reports

DOI

EISSN

2045-2322

ISSN

2045-2322

Publication Date

August 2015

Volume

5

Start / End Page

12764
 

Citation

APA
Chicago
ICMJE
MLA
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Lipworth, G., Ensworth, J., Seetharam, K., Lee, J. S., Schmalenberg, P., Nomura, T., … Urzhumov, Y. (2015). Quasi-Static Magnetic Field Shielding Using Longitudinal Mu-Near-Zero Metamaterials. Scientific Reports, 5, 12764. https://doi.org/10.1038/srep12764
Lipworth, Guy, Joshua Ensworth, Kushal Seetharam, Jae Seung Lee, Paul Schmalenberg, Tsuyoshi Nomura, Matthew S. Reynolds, David R. Smith, and Yaroslav Urzhumov. “Quasi-Static Magnetic Field Shielding Using Longitudinal Mu-Near-Zero Metamaterials.Scientific Reports 5 (August 2015): 12764. https://doi.org/10.1038/srep12764.
Lipworth G, Ensworth J, Seetharam K, Lee JS, Schmalenberg P, Nomura T, et al. Quasi-Static Magnetic Field Shielding Using Longitudinal Mu-Near-Zero Metamaterials. Scientific reports. 2015 Aug;5:12764.
Lipworth, Guy, et al. “Quasi-Static Magnetic Field Shielding Using Longitudinal Mu-Near-Zero Metamaterials.Scientific Reports, vol. 5, Aug. 2015, p. 12764. Epmc, doi:10.1038/srep12764.
Lipworth G, Ensworth J, Seetharam K, Lee JS, Schmalenberg P, Nomura T, Reynolds MS, Smith DR, Urzhumov Y. Quasi-Static Magnetic Field Shielding Using Longitudinal Mu-Near-Zero Metamaterials. Scientific reports. 2015 Aug;5:12764.

Published In

Scientific reports

DOI

EISSN

2045-2322

ISSN

2045-2322

Publication Date

August 2015

Volume

5

Start / End Page

12764