Techniques for measuring the electromagnetic shielding effectiveness of materials. I. Far-field source simulation

Wilson, Perry F.; Ma, Mingyang; Adams, John W.

doi:10.1109/15.3302

Cited by 150 publications

(42 citation statements)

References 18 publications

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“…The test frequency was between 30 and 1000 MHz, 16 although the holder was a modified evaluator, with a dynamic test frequency of up to 1.5 GHz. The SE was obtained by subtraction of the background value.…”

Section: Testing Of Emi Se and Mechanical Propertiesmentioning

confidence: 99%

Electromagnetic interference shielding effectiveness and mechanical sliding behavior for electroless nickel/phosphorous–poly(tetrafluoroethylene) codeposition on carbon fiber/acrylonitrile–butadiene–styrene composites

Huang

2002

J of Applied Polymer Sci

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Poly(tetrafluoroethylene) (PTFE) powders were mounted on an electroless nickel/phosphorous (Ni/P) film on the surface of a carbon fiber by an electroless codeposition method. This type of carbon fiber filler, denoted FENCF, was then compounded with acrylonitrile-butadiene-styrene (ABS) for use in electromagnetic interference shielding. For the suspension of the PTFE powders, a surfactant was used. Although the adhesion between the electroless Ni/P-PTFE films and the fiber was reduced, the PTFE powders on the surface of FENCF reduced the torque values when compounded into the ABS matrix because of a self-lubricating effect. The two-step FENCF composites exhibited particularly significant advantages. The torque values for the two-step FENCF/ABS composites were about one-half of those for carbon fiber/ABS composites in compounding processes; in addition, the former had an average mean fiber length almost 2.5 times that of the latter. The multiyield phenomena in stress-strain curves of FENCF/ABS composites implied that the PTFE powders mounted on Ni/P films slid during stress-strain action. The electromagnetic interference shielding effectiveness of FENCF/ABS composites did not decrease significantly even though the PTFE powders formed a discontinuous phase on the electroless Ni/P films. The mechanical properties of FENCF composites were enhanced because of the larger fiber length.

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Section: Testing Of Emi Se and Mechanical Propertiesmentioning

confidence: 99%

Electromagnetic interference shielding effectiveness and mechanical sliding behavior for electroless nickel/phosphorous–poly(tetrafluoroethylene) codeposition on carbon fiber/acrylonitrile–butadiene–styrene composites

Huang

2002

J of Applied Polymer Sci

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“…In each case, the source output level is kept the same. The ratio of the two received powers gives the insertion loss [26].…”

Section: Methodsmentioning

confidence: 99%

Shielding Effectiveness of a Metamaterial Measured at Microwave Range of Frecuency, Known as Wire Screen Metamaterial (Wsm)

Boggi¹,

Alonso²,

Fano³

2018

PIER M

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Abstract-This paper presents the study of an artificial material, made up of a periodic structure, defined by a unit cell, consisting of a finite number N of periodic layers of thin conducting cylinders placed between two dielectric planes. These artificial materials known as metamaterials can be regarded as a homogeneous material with effective constitutive parameters impossible to achieve with naturally occurring materials, such as negative values for both magnetic permeability and electric permittivity. An analytical model has been developed to study the effective electric permittivity of the whole system in terms of the unit cell dimensions and the frequency of the incident electromagnetic wave. Simulations of the effective electric permittivity of the metamaterial were performed by varying the geometry of the metamaterial. This analysis enables the design and construction of structures with properties that make them an attractive candidate for shielding applications in the range of microwave frequencies. The metamaterial has been constructed with four rows of 5 bronze conducting rods each. We have made experimental measurements of the shielding effectiveness of these materials when subjected to a electromagnetic plane wave with electric field polarized along the direction of the conducting rods, and conversely, with electric field polarized perpendicular to the rods. Non-zero values for shielding effectiveness were observed in the first polarization, and zero values in the second case.

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“…The desired value for statically dissipate material is between 1025/cm2 and 1065)/cm2, and for shielding material is lower than 102 ~/cm2 [2]. There are several methods to improve the fabric conductivity, such as lamination of conductive layers on to the surface of the fabric [3,4,5], addition the conductive fillers [2,6,7,8], incorporation of conductive fibers or yarn into the fabric [9,10].…”

Section: Introductionmentioning

confidence: 99%

The Leakage Power Density and Electromagnetic Shielding Effectiveness of Conductive Woven Fabrics

Ueng

Cheng

2001

Journal of Textile Engineering

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This paper presents a study on the development of stainless steel/polyester (SS/PET), stainless steel/rayon (SS/RS), and stainless steel/Kevlar (SS/KS) woven fabrics for shielding the power leakage of microwave oven applications. To facilitate weaving of stainless steel wires and to reduce the material cost initially the core-spun yarns of stainless steel and man-made staple fibers were produced by a DREF III open-end spinning method. The core-spun yarns were woven into a variety of woven structures that woven from a Picanol Rapier loom successfully. Primary objects of this research are to develop new conductive core-spun yarns and fabrics, which could be suitable for shielding home electronic and electrical appliance from electrical and magnetic fields at high frequency. Using a coaxial transmission line holder system set-up, the electromagnetic shielding effectiveness (EMSE) of various woven fabrics. was determined in the frequency range from 300 kHz to 3 GHz. The leakage power detector measures the leakage power density (LPD) of the microwave oven. The variations of EMSE and LPD with the yarn constructions, woven structures and the blend ratio of stainless steel to the man-made fiber in the yarns are also described.

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Techniques for measuring the electromagnetic shielding effectiveness of materials. I. Far-field source simulation

Cited by 150 publications

References 18 publications

Electromagnetic interference shielding effectiveness and mechanical sliding behavior for electroless nickel/phosphorous–poly(tetrafluoroethylene) codeposition on carbon fiber/acrylonitrile–butadiene–styrene composites

Electromagnetic interference shielding effectiveness and mechanical sliding behavior for electroless nickel/phosphorous–poly(tetrafluoroethylene) codeposition on carbon fiber/acrylonitrile–butadiene–styrene composites

Shielding Effectiveness of a Metamaterial Measured at Microwave Range of Frecuency, Known as Wire Screen Metamaterial (Wsm)

The Leakage Power Density and Electromagnetic Shielding Effectiveness of Conductive Woven Fabrics

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