scholarly journals Significant enhancement of magnetic shielding effect by using the composite metamaterial composed of mu-near-zero media and ferrite

2021 ◽  
Vol 8 ◽  
pp. 13
Author(s):  
Xu Chen ◽  
Yuqian Wang ◽  
Zhiwei Guo ◽  
Xian Wu ◽  
Fengqing Yang ◽  
...  
Keyword(s):  
Small Area ◽  
Near Field ◽  
Experimental Results ◽  
Shielding Effect ◽  
Magnetic Shielding ◽  
Shielding Effectiveness ◽  
Large Area ◽  
Magnetic Shield ◽  
Field Control ◽  
Ferrite Slab

The magnetic shield plays an important role in magnetic near-field control. However, the requirements of efficiency, ultra thinness, lightness and cheapness are still the challenges. Here, we firstly propose a composite metamaterial in which the mu-near-zero media is covered with a ferrite slab. We verify that this structure can enhance the shielding effectiveness (SE) in a small area. Furthermore, we optimize the magnetic path by changing the bulk ferrite slab into a patterned slab. In this way, significant SE enhancement can be achieved in a large area. Experimental results show that the maximum SE of the composite metamaterial with a patterned ferrite is 20.56 dB, which is nearly 19 dB higher than that of a single ferrite slab with the same thickness of the composite metamaterial. The results on the composite metamaterial would be very useful in the applications involving magnetic shielding.

scholarly journals A New Methodology to Predict the Magnetic Shielding Effectiveness of Enclosures at Low Frequency in the Near Field

2015 ◽  
Vol 51 (3) ◽  
pp. 1-4 ◽  
Author(s):  
Amin Frikha ◽  
Mohamed Bensetti ◽  
Fabrice Duval ◽  
Nabil Benjelloun ◽  
Frederic Lafon ◽  
...  
Keyword(s):  
Near Field ◽  
Low Frequency ◽  
Magnetic Shielding ◽  
Shielding Effectiveness

Studies on Magnetic Shielding Effectiveness by Finite Element Method

2009 ◽  
Vol 79-82 ◽  
pp. 1233-1236
Author(s):  
G.H. Wu ◽  
Xiao Li Huang ◽  
Mao Qiang Duan ◽  
Qiang Zhang ◽  
X. Chen
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Finite Element ◽  
Uniform Magnetic Field ◽  
Double Layers ◽  
Magnetic Shielding ◽  
Shielding Effectiveness ◽  
Magnetic Shield ◽  
Iron Plate ◽  
Circular Shape

Maxwell 2D software is introduced in this paper to calculate the magnetic shielding effectiveness (MSE) properties of iron plate. The three-dimensional magnetic shield is thought isotropic and simplified as two-dimensional model to study its MSE properties by the finite element method. In this method, a uniform magnetic field is generated by two huge magnets and the MSE properties of iron plate, which is in the centre of the uniform magnetic field, is then calculated by the ratio of magnetic field intensity after and before magnetic shielding. All the results indicate that shape of shield materials affects the MSE properties much and the MSE properties of shield with square and circular shape with 3mm in depth are 39.3 and 53.5 dB, respectively. That means the shield shape with fewer bending is favorable to the conductivity of magnetic energy. It also shows that the MSE value decreased linearly with the distance between the magnetic shield and the centre of the magnetic field. That is, the increase of side length of magnetic shield will lead to the decrease of MSE properties of iron plate, which is agreement with the theoretical prediction of Lu H.M. model. Furthermore, the MSE properties of double layers shielding (iron plate with 2mm in depth and 3mm iron plate with 81% porosity) are also studied in this paper. The effect of places of iron plate with 2mm in depth is presented to play important role in double layers shielding and the MSE value increases with the distance between the two magnetic shields. Compared to that of shield with circular shape, the MSE properties are similar to each other when the distance of the two shields is 8mm. In addition, it also indicates that the MSE value is higher when the iron plate with 2mm in depth is inside of the other than that when it is outside.

Magnetic Shielding Effectiveness of Enclosures in Near Field at Low Frequency for Automotive Applications

2015 ◽  
Vol 57 (6) ◽  
pp. 1481-1490 ◽  
Author(s):  
Amin Frikha ◽  
Mohamed Bensetti ◽  
Lionel Pichon ◽  
Frederic Lafon ◽  
Fabrice Duval ◽  
...  
Keyword(s):  
Near Field ◽  
Low Frequency ◽  
Magnetic Shielding ◽  
Automotive Applications ◽  
Shielding Effectiveness

Homogenization of Composite Panels From a Near-Field Magnetic Shielding Effectiveness Measurement

2012 ◽  
Vol 54 (3) ◽  
pp. 700-703 ◽  
Author(s):  
G. Andrieu ◽  
J. Panh ◽  
A. Reineix ◽  
P. Pélissou ◽  
C. Girard ◽  
...  
Keyword(s):  
Near Field ◽  
Magnetic Shielding ◽  
Composite Panels ◽  
Shielding Effectiveness ◽  
Effectiveness Measurement

scholarly journals Anhysteretic Permeability and Magnetic Shielding Effect of Steel Sheets for Magnetic Shield

2005 ◽  
Vol 125 (5) ◽  
pp. 466-470 ◽  
Author(s):  
Koichiro Fujita ◽  
Hideki Matsuoka ◽  
Tatsuhiko Hiratani ◽  
Kenji Tahara ◽  
Yasushi Tanaka
Keyword(s):  
Shielding Effect ◽  
Magnetic Shielding ◽  
Magnetic Shield ◽  
Steel Sheets

Near Field Control for Enhanced Photovoltaic Performance and Photostability in Perovskite Solar Cells

Nano Energy ◽  
2021 ◽  
pp. 106388
Author(s):  
Mohammad Ismail Hossain ◽  
Md. Shahiduzzaman ◽  
Safayet Ahmed ◽  
Md. Rashedul Huqe ◽  
Wayesh Qarony ◽  
...  
Keyword(s):  
Solar Cells ◽  
Near Field ◽  
Photovoltaic Performance ◽  
Perovskite Solar Cells ◽  
Field Control
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