Electromagnetic shielding properties of soft magnetic metal and ferrite composites for application to suppress noise in a radio frequency range

The cement-based composite shielding materials was prepared using portland cement and nickel fiber. The effects of dispersive manner, contents of nickel fiber, thickness of specimens on shielding properties and conductivity were studied in a frequency range of 100 KHz~1.5 GHz. With the contents of nickel fiber by ultrasonic dispersed at 5 vol.% and specimen’s thickness of 10 mm, the conductivity is 2.58×10-3 S•cm-1 and maximum shielding effectiveness is 47.8 dB, average shielding effectiveness reaches about 45.9 dB for cement-based composites.

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Shielding properties of CuNiZn ferrite in the radio frequency range

Ceramics International ◽

10.1016/j.ceramint.2012.11.067 ◽

2013 ◽

Vol 39 (5) ◽

pp. 4777-4782 ◽

Cited By ~ 15

Author(s):

María.S. Ruiz ◽

Paula.G. Bercoff ◽

Silvia.E. Jacobo

Keyword(s):

Radio Frequency ◽

Frequency Range ◽

Shielding Properties

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Effectiveness of Low Frequency Electromagnetic Shielding of Concrete with the Functionally Primitives Materials of Short Carbon Fibers and Graphite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.189-193.4297 ◽

2011 ◽

Vol 189-193 ◽

pp. 4297-4303 ◽

Cited By ~ 1

Author(s):

Fa Qin Dong ◽

Qiong Si

Keyword(s):

Carbon Fibers ◽

Low Frequency ◽

Electromagnetic Shielding ◽

Shielding Effectiveness ◽

Frequency Range ◽

Shielding Properties ◽

Electromagnetic Shielding Effectiveness ◽

Short Carbon

The electromagnetic shielding properties of short carbon fibers and graphite concrete were investigated, and the influence of the contents of the short carbon fibers and graphite on the electromagnetic shielding effectiveness of the concrete in low frequency was studied. The mechanism causing the influence of the short carbon fibers adulteration on the electromagnetic shielding effectiveness of the graphite concrete at low frequency was investigated. The maximum electromagnetic shielding effectiveness was up to 8.5dB in the low frequency range of 1MHz～1.8GH. The results of the investigation provide the basis for further designing and producing of high-powered electromagnetic shielding concrete at low frequency.

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Electromagnetic Shielding Properties of Plain Knitted Fabrics Containing Conductive Yarns

Journal of Engineered Fibers and Fabrics ◽

10.1177/155892501200700404 ◽

2012 ◽

Vol 7 (4) ◽

pp. 155892501200700 ◽

Cited By ~ 14

Author(s):

Fatma Ceken ◽

Gulsah Pamuk ◽

Ozan Kayacan ◽

Ahmet Ozkurt ◽

Şebnem Seçkin Ugurlu

Keyword(s):

Stainless Steel ◽

Electromagnetic Shielding ◽

Frequency Range ◽

Horizontal Polarization ◽

Knitted Fabrics ◽

Polarization Measurements ◽

Fabric Structure ◽

Measurement Results ◽

Conductive Yarns ◽

Shielding Properties

In this study, stainless steel conductive yarns with 500 tex fineness and 14 Ω/m linear resistances were inserted into the reverse side of the knitted fabrics made from acrylic yarns. Six types of knitted fabrics with conductive yarns were produced on an E=7 gauge electronic flat bed knitting machine. Then the electromagnetic shielding efficiency (EMSE) of the sample fabrics were measured in the frequency range of 750 MHz – 3000 MHz. The EMSE variations of the sample fabrics having conductive yarns with respect to fabric structure and polarization type (vertical and horizontal) were also investigated. It was observed that the same samples showed different behaviors and have dissimilar EMSE values in different polarization conditions. When compared to horizontal polarization measurements, the vertical measurement results gave better EMSE values.

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