Technical progress of EMI shielding materials in Japan

Yasufuku, S.

doi:10.1109/57.63095

Cited by 14 publications

(7 citation statements)

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“…The obtained SE value, which is 30 dB or higher, is within normal shielding range. 27 The highest SE value of Y1S-a fabric was recorded to be 45.35 dB at 263 MHz for horizontal polarization.…”

Section: Resultsmentioning

confidence: 91%

Determination of electromagnetic shielding performance of hybrid yarn knitted fabrics with anechoic chamber method

Örtlek

Alpyıldız

Kılıç

2012

Textile Research Journal

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The electromagnetic shielding effectiveness (SE) of various weft-knitted fabrics made of hybrid yarns is investigated by considering the anisotropy of the structures, which has not been analyzed in previous studies. The anechoic chamber with aperture method at different polarizations of electromagnetic waves within the frequency range of 30 MHz and 9.93 GHz is used to determine the SE of knitted fabrics manufactured on a circular weft knitting machine from siro-spun and siro core-spun yarns without and with a metal core. The results show that SE depends on the orientation of the fibers within the structure regarding the direction of the electrical field in addition to parameters such as metal content, loop length and frequency; these results can be used to outline the basic points in determining a knit structure with desired SE.

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Section: Resultsmentioning

confidence: 91%

Determination of electromagnetic shielding performance of hybrid yarn knitted fabrics with anechoic chamber method

Örtlek

Alpyıldız

Kılıç

2012

Textile Research Journal

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“…The 2-and 20-layered composite laminates possessed 65.0 6 1.0% and 58.0 6 2.0% fiber volume fractions, respectively. Sample sizes of 125.0 Â 12.5 Â 0.44 mm 3 and 50.0 Â 50.0 Â 0.44 mm 3 were used for tensile and EMI shielding tests, respectively. For the through thickness resistivity measurements, 4.0 Â 3.0 Â 3.0 mm 3 samples from different locations, and for the in-plane resistivity tests, narrow strips of 30.0 Â 4.0 Â 3.0 mm 3 were diced from the fabricated 20-ply composite laminates.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…where A is the absorption loss, related to the energy attenuation due to energy transmission within the conductive sheet, R is the reflection loss, corresponding to the energy reflected from the sheet's recipient face, and M is the multiple-reflection loss, related to repetitive reflections between the two internal surfaces of the conductive sheet, all expressed in decibels. In general, a good EMI shield should possess a high electrical conductivity and a low magnetic permeability [3]. Traditional structural materials, i.e., metals, are well-known to be good EMI shielding materials for most of the applications.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Shielding Effectiveness of a Hybrid Carbon Nanotube/Glass Fiber Reinforced Polymer Composite

Boroujeni

Tehrani

Manteghi

et al. 2016

Journal of Engineering Materials and Technology

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A relatively low-temperature carbon nanotube (CNT) synthesis technique, graphitic structure by design (GSD), was utilized to grow CNTs over glass fibers. Composite laminates based on the hybrid CNTs–glass fibers were fabricated and examined for their electromagnetic interfering (EMI) shielding effectiveness (SE), in-plane and out-of-plane electrical conductivities and mechanical properties. Despite degrading the strength and strain-to-failure, improvements in the elastic modulus, electrical conductivities, and EMI SE of the glass fiber reinforced polymer (GFRP) composites were observed.

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“…The EMSE value reaches above 30 dB at the 8.2-9 GHz and 8.2-9.6 GHz frequency ranges for parallel polarization at extension of 10% and 40%, respectively. Such values are regarded to be within the normal shielding range [49]. In addition, the value reaches above 20 dB over almost the entire X-band irrespective of the applied strains considered, indicating that the fabrics are highly suitable for general uses and perhaps many special/professional applications [50].…”

Section: Emse Of Fabric At Different Elongationsmentioning

confidence: 99%

“…For 90 • /90 • parallel polarization and 0 • /90 • orthogonal configuration, effective EM shielding was observed (T ≈ 0), whilst fabric exhibited transmission (T > 92%) at 0 • /0 • perpendicular polarization. In short, a two-layer 0 • /90 • laminated fabric was enough to satisfy people's needs against EM waves in daily life, since the EMSE values were almost all above 20 dB in the entire X-band frequency range [49].…”

Section: Emse Of Two-layer Laminated Fabricsmentioning

confidence: 99%

Multifunctional Stretchable Conductive Woven Fabric Containing Metal Wire with Durable Structural Stability and Electromagnetic Shielding in the X-Band

et al. 2020

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Elastomeric, conductive composite yarns have recently received attention around the opportunity for them to offer special protective fields. A straightforward approach for fabricating tri-component elastic-conductive composite yarns (t-ECCYs) containing stainless steel wire (SSW) was proposed previously. This work mainly focuses on the electromagnetic shielding effectiveness (EMSE) of weft-stretchable woven fabric containing t-ECCY over the X-band under different testing conditions, e.g., single step-by-step elongation, cyclic stretch and lamination events. Results showed that a woven cotton fabric with weft yarn of t-ECCY not only exhibited superior weft stretch-ability to a higher elongation (>40%) compared with a pure cotton control but also had an acceptable 15-cyclic stability with 80% shape recovery retention. The t-ECCY weft fabric was effective in shielding electromagnetic radiation, and its EMSE was also enhanced at elevated elongations during stretch at parallel polarization of EM waves. There was also no decay in EMSE before and after the t-ECCY fabric was subject to 15 stretch cycles at extension of 20%. In addition, a 90 • by 90 • cross lamination of t-ECCY fabric remarkably improved the EMSE compared to a 0 • /90 • one. The scalable fabrication strategy and excellent EMSE seen in t-ECCY-incorporated fabrics represent a significant step forward in protective fields.

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Technical progress of EMI shielding materials in Japan

Cited by 14 publications

References 0 publications

Determination of electromagnetic shielding performance of hybrid yarn knitted fabrics with anechoic chamber method

Determination of electromagnetic shielding performance of hybrid yarn knitted fabrics with anechoic chamber method

Electromagnetic Shielding Effectiveness of a Hybrid Carbon Nanotube/Glass Fiber Reinforced Polymer Composite

Multifunctional Stretchable Conductive Woven Fabric Containing Metal Wire with Durable Structural Stability and Electromagnetic Shielding in the X-Band

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