Molding the Flow of Magnetic Field With Metamaterials: Magnetic Field Shielding

Boyvat, Mustafa; Hafner, Christian

doi:10.2528/pier12022010

Cited by 24 publications

(21 citation statements)

References 17 publications

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“…It is clear that this method is highly effective and that should be the first one to be applied. However, if higher reduction is required, one should turn to additional procedures, like the use of shielding [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field Shielding of Underground Cable Duct Banks

Romero¹,

Del-Pino-López²

2013

PIER

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Abstract-In this paper an in-depth parametric analysis of shielding effectiveness obtained when using ferromagnetic or conductive screens to mitigate the field generated by duct banks is presented. Due to the need of a case-by-case approach, all the simulations, performed by a finite element software (GetDp), are applied to a case study composed by 9 (3 × 3) ducts, with six of them including high voltage single-core cables and the three left empty for eventual future expansion. Two shielding geometries are tested: horizontal and U-reverse, changing in each one the main parameters: width, thickness, clearance to conductors, etc. Moreover, the conductors are grouped in two balanced in-phase three-phase circuits arranged in three configurations: vertical, horizontal and triangular. The mutual phase ordering of both circuits is the one that minimizes the field, so no further field reduction can be obtained by simple methods. The power losses and cost of different shielding solutions are also presented, including the effect of adding a third circuit if required.

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Section: Introductionmentioning

confidence: 99%

Magnetic Field Shielding of Underground Cable Duct Banks

Romero¹,

Del-Pino-López²

2013

PIER

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“…Response of an RLC meta-atom: Phasors of the source (blue, continuous), resonator (red, dashed), and total (black, dotted) magnetic flux density. The circle is the trace of meta-atom magnetic flux density for frequencies from 0 to infinity [12]. M and N points show the points at which the total magnetic flux density is maximum and minimum respectively.…”

Section: Shielding Principle Of a Magnetic Meta-atommentioning

confidence: 99%

“…Since these regulations became stricter in some countries, e.g., Italy and Switzerland, there is a need for finding improved magnetic field shields. Recently, it has been shown that metamaterials can indeed be used to shield magnetic fields at very low frequencies [12]. Similar to natural materials, which are composed of atoms and molecules, metamaterials are composed of subwavelength units, which are called 'meta-atoms' [1].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field Shielding by Metamaterials

Boyvat¹,

Hafner²

2013

PIER

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Abstract-Magnetic field shielding at low frequencies is a problem of high importance that is known for a long time. Metamaterials, which are known from fancy applications such as the so-called perfect lens and cloaking, also offer a new way to create efficient magnetic shielding by means of anisotropic metamaterials with low permeability in one direction. Such metamaterials can be constructed by assembling arrays of relatively simple LC circuits. In this paper, we analyze different metamaterials and show how they may be designed. We show that typical resistive losses in the coils and capacitors of the LC circuits reduce the shielding quality. Then, we consider the possibility of active electronic loss compensation and discuss the drawbacks of this concept. After this, we propose a purely passive way that benefits from the inhomogeneity of the magnetic field to be shielded. Finally, we present experimental results, which show the performance of metamaterial shields.

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“…Until recently the studies on the shielding fabric have mainly focused on model construction of the BESF [3,4], performance of the BESF [5,6], testing of the BESF [7], and shielding fiber [8]. We still possess poor information about the SE computation of BESF.…”

Section: Introductionmentioning

confidence: 99%

A New Computation of Shielding Effectiveness of Electromagnetic Radiation Shielding Fabric

Wang¹,

Liu²

2012

PIER Letters

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Abstract-In this paper, a new computation model of shielding effectiveness (SE) is proposed in order to calculate the SE of blended electromagnetic shielding fabric (BESF) by some structural parameters. Some computation equations of the SE for the BESF are given according to the theoretical deduction and previous experimental results. And then a shielding coefficient in the computation model is determined by experiments. The linear region boundary for the model is introduced to segment the computation of the SE. Results show that the SE obtained from the proposed model is consistent with that from experiments and the error is less than 2%. It can be concluded that the proposed model can accurately calculate the SE of plain, twill and satin weaves fabrics.

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Molding the Flow of Magnetic Field With Metamaterials: Magnetic Field Shielding

Cited by 24 publications

References 17 publications

Magnetic Field Shielding of Underground Cable Duct Banks

Magnetic Field Shielding of Underground Cable Duct Banks

Magnetic Field Shielding by Metamaterials

A New Computation of Shielding Effectiveness of Electromagnetic Radiation Shielding Fabric

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