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DC magnetic concentrator and omnidirectional cascaded cloak by using only one or two homogeneous anisotropic materials of positive permeability
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. KTH, School of Information and Communication Technology (ICT), Centres, Zhejiang-KTH Joint Research Center of Photonics, JORCEP.ORCID iD: 0000-0002-3401-1125
2013 (English)In: Progress In Electromagnetics Research, ISSN 1070-4698, E-ISSN 1559-8985, Vol. 142, 683-699 p.Article in journal (Refereed) Published
Abstract [en]

A novel concentrator for static magnetic field enhancement is proposed and designed utilizing transformation optics. Compared with other devices for static magnetic field enhancement, our device has many good features: first, our concentrator can achieve a DC magnetic field enhancement in a relatively large free space with high uniformity. Secondly, our concentrator is composed by only one or two homogenous anisotropic materials with principal value greater than zero (without any infinitely large or zero value), which can be achieved by using currently available materials. Thirdly, the geometrical shape of the proposed device determines the enhancement factor and the permeability of the device. After choosing suitable geometrical parameters, we can obtain a concentration with a suitable enhancement factor and a material requirement that is easily achievable. The proposed concentrator will have many important applications in many areas (e.g., magnetic resonance imaging and magnetic sensors). Based on the same theoretical model, we also proposed a cascaded shielding device cloak for static magnetic fields. The proposed DC magnetic shielding device can be realized without using any material of zero permeability, and will have potential applications in, e.g., hiding a metallic object from being detected by a metal locator.

Place, publisher, year, edition, pages
2013. Vol. 142, 683-699 p.
Keyword [en]
Anisotropic material, Enhancement factor, Geometrical shapes, Magnetic concentrator, Material requirements, Static magnetic fields, Theoretical modeling, Transformation optics
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-139194DOI: 10.2528/PIER13092509ISI: 000327478000040Scopus ID: 2-s2.0-84885908717OAI: oai:DiVA.org:kth-139194DiVA: diva2:686073
Funder
Swedish Research Council, 621-2011-4620
Note

QC 20140110

Available from: 2014-01-10 Created: 2014-01-08 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Transformation Optics for Controlling DC Magnetic Field
Open this publication in new window or tab >>Transformation Optics for Controlling DC Magnetic Field
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Based on the form-invariant of Maxwell’s equations under coordinate transformations, we extend the theoryof transformation optics to transformation magneto-statics, which can design magnets through coordinatetransformations. Some novel DC magnetic field illusions created by magnets (e.g. rescaling magnets,cancelling magnets and overlapping magnets) are designed and verified by numerical simulations. Ourresearch will open a new door to designing magnets and controlling DC magnetic fields.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. xiv, 81 p.
Series
TRITA-EE, ISSN 1653-5146 ; 2014:051
Keyword
Transformation magneto-statics, magnets, DC magnetic field
National Category
Materials Engineering Electrical Engineering, Electronic Engineering, Information Engineering Other Physics Topics
Research subject
Electrical Engineering; Materials Science and Engineering
Identifiers
urn:nbn:se:kth:diva-155326 (URN)978-91-7595-328-1 (ISBN)
Public defence
2014-12-01, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20141105

Available from: 2014-11-05 Created: 2014-11-04 Last updated: 2014-11-05Bibliographically approved

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He, Sailing

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