Electromagnetic Compatibility for Device Design and System Integration

Gonschorek, Karl-Heinz; Vick, Ralf

doi:10.1007/978-3-642-03290-5

Cited by 18 publications

(14 citation statements)

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“…Their negative contribution to global shielding (SE MR ) can be neglected when the thickness of the shield is greater than depth of penetration of the wave (δ) or when (SE A ) is higher than 10 dB according to the Schelkunoff's theory . However, if the shield is thinner than the skin depth, the influence of multiple‐reflection will be significant in decreasing overall EMI shielding .…”

Section: Electromagnetic Shielding Materialsmentioning

confidence: 99%

Electromagnetic Shielding Materials in GHz Range

González

Pozuelo

Baselga

2018

The Chemical Record

112

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The state-of-the art in the design and the manufacture methods of the different electromagnetic shielding materials has been reviewed. This topic has become a mainstream field of research because of the electromagnetic pollution generated by telecommunication technology development. The review is centred in absorbent materials and shows a general overview of how the absorption properties of such composites can be tailored through changes in geometry, composition, morphology, and the filler particles content. Although different types of materials are explained, the text is mainly focused on carbon materials such as graphene and carbon nanotubes. In this way, the importance of the dispersion of the conductive fillers in different polymer matrices is discussed. In addition, an extensive study on new complex architectures such as foam-based materials is presented. Finally, the combination of carbon fillers with other constituents such as metallic nanoparticles is mentioned. In all these studies, the efficiency of the composites as absorbent or reflective of electromagnetic radiation is discussed.

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Section: Electromagnetic Shielding Materialsmentioning

confidence: 99%

Electromagnetic Shielding Materials in GHz Range

González

Pozuelo

Baselga

2018

The Chemical Record

112

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“…Multiple reflections produced by the interference of the reflected radiation in the first plane of incidence, and reflection produced in the last plane of the material, originate constructive and destructive interference dependant on the frequency. According to the Schelkunoff's theory [11][12][13], multiple reflections can be neglected when the sample thickness is larger than the skin depth, as mentioned above. In samples with a thickness of 4 mm, multiple reflections may be negligible above 5 GHz.…”

Section: Measurement Techniquesmentioning

confidence: 99%

“…Increasing their weight percentage in the composite enhances the shielding efficiency of the material but decreases its mechanical properties and processability, so a compromise between these properties for each application must be obtained. Figure 8 shows CNT foams synthesized by chemical vapour deposition (CVD) with SE T of to 22 dB in almost the entire frequency window (1-18 GHz) for the 2.38 mm thick CNT-foam slab [11]. CNT foams possess extremely low densities lower than 0.02 g•cm −3 and the higher specific shielding efficiency obtained of 1100 dB•cm 3 •g −1 .…”

Section: Carbon Nanotubesmentioning

confidence: 99%

Carbon Nanotube Composites as Electromagnetic Shielding Materials in GHz Range

González¹,

Mokry²,

Nicolás³

et al. 2016

Carbon Nanotubes - Current Progress of Their Polymer Composites

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Following the development of the new electronic systems and communication networks, the levels of electromagnetic contamination have risen dramatically in the recent years. Every day, new studies appear searching for a way to mitigate the electromagnetic interferences EMI . "t the same time, the rapid evolution of technology forces the field to search for lighter and more efficient materials. The composites using carbon allotropes such as carbon nanotubes and polymers as reinforcement are gaining importance, due to the many advantages they exhibit in comparison to the materials that were used until now. " great number of applications require absorption to be the main electromagnetic shielding mechanism, thereby making this review necessary as a way to summarize the latest studies on CNT/polymer composites and how to improve the absorption mechanism by changing the morphology and composition of CNTs.

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“…The region with constant value of wave impedance is the far-field shielding region (Radiation Field or Fraunhoher Zone) ( Fig. 2) [26]. In the far-field shielding region, the distance between the radiation source and the shield is higher than λ/2π (where λ is freespace wavelength of the radiation).…”

Section: Introductionmentioning

confidence: 99%