Flexible and Transparent EMI Shielding Materials

Ray, Bishakha; Parmar, Saurabh; Datar, Suwarna

doi:10.1002/9781119128625.ch8

Cited by 7 publications

(3 citation statements)

References 36 publications

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“…Three main types of microwave behaviour are typically observed: transmission, reflection, and absorption. Transparent materials, characterised by low dielectric loss, allow microwaves to pass through with minimal attenuation [6,7]. Opaque materials, in contrast, reflect microwaves without transmission.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characteristics of High-Performance, Low-Density Metallo–Ceramics Composite

Abramovskis,

Drunka,

Csáki

et al. 2023

Materials

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By applying the physical vapour deposition method, hollow ceramic microspheres were coated with titanium, and subsequently, they were sintered using the spark plasma sintering technique to create a porous ceramic material that is lightweight and devoid of a matrix. The sintering process was carried out at temperatures ranging from 1050 to 1200 °C, with a holding time of 2 min. The samples were subjected to conventional thermal analyses (differential scanning calorimetry, thermogravimetry, dilatometry), oxidation resistance tests, and thermal diffusivity measurements. Phase analysis of the samples was performed using the XRD and the microstructure of the prepared specimens was examined using electron microscopy. The titanium coating on the microspheres increased the compressive strength and density of the resulting ceramic material as the sintering temperature increased. The morphology of the samples was carefully examined, and phase transitions were also identified during the analysis of the samples.

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Section: Introductionmentioning

confidence: 99%

Preparation and Characteristics of High-Performance, Low-Density Metallo–Ceramics Composite

Abramovskis,

Drunka,

Csáki

et al. 2023

Materials

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“…Such a window is detrimental to the shielding effectiveness (SE) of the housing. Multiple technical solutions fulfilling both electromagnetic shielding at radio frequencies and optical transparency have been published over the years [5]. Among them, micrometric mesh metal films offer significant shielding performance and are easily adapted to the targeted radiofrequency range [6], [7], [8].…”

Section: Introductionmentioning

confidence: 99%

Auto-activated Electromagnetic Shield Upon High Intensity Radiated Field Illumination

Tricas

Castel

Paven

et al. 2022

2022 International Symposium on Electromagnetic Compatibility – EMC Europe

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This paper concerns the protection of electro-optic and electromagnetic sensors embedded into a metallic cavity equipped with a window made of a non-electrically conducting material and optically transparent over the visible light and/or infra-red spectrum. In the presence of high intensity radiated fields, the cavity must be appropriately shielded to protect those sensors, this protection being detrimental to EM sensors sensitivity in their absence. We propose here an automatic and quasiinstantaneous activation of an electromagnetic shield printed on the window glass through the detection of the impinging electromagnetic field. The presented solution is based on thin micrometric mesh-metal film deposited on a glass substrate surrounded by a parallel arrangement of p-i-n diodes polarized by the EM field source itself. An experimental validation is performed using a reverberation chamber to generate the electromagnetic field stress while performing a shielding effectiveness measurement using the nested reverberation chamber test setup.

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“…Accordingly, the shields must exhibit high optical transparency over the entire visible light spectrum to enable sensors to get optical information. Multiple technical solutions fulfilling these requirements have been published over the years [5], such as the use of ultrathin silver film [6], silver nanowires in a transparent matrix [7]- [9], conducting graphene-based hybrid films [10], indium tin oxide thin films [11], [12], or mesh metal films [13]- [15] deposited on glass, polyethylene terephthalate, or freestanding. The last solution provides high shielding effectiveness (SE) over the 2-50 GHz frequency range, coupled with high level of optical transparency (higher than 80%) over the entire visible range.…”

mentioning

confidence: 99%

Dynamic Control of the Shielding Effectiveness of Optically Transparent Screens

Tricas

Castel

Besnier

et al. 2022

IEEE Trans. Electromagn. Compat.

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This article presents the design, fabrication, and characterization of an active electromagnetic shield intended to dynamically protect optical and electromagnetic sensors against high intensity radiated fields. The shield exhibits high and constant optical transparency level over the entire visible light spectrum thanks to a micrometric mesh metal thin film printed on a glass substrate. The central micrometric mesh area is separated from the peripheral ground plane of the shield by a peripheral slot. This slot is fitted out with p-i-n diodes and resistors, connecting electrically the central micrometric mesh area and the ground plane. The aim of these components is to dynamically control the shielding effectiveness of the screen, by using the conducting (ON) or blocking (OFF) states of the p-i-n diodes. Accordingly, the shielding effectiveness can be set at high level to protect the system against high intensity radiated fields, and conversely at low level to both prevent system electromagnetic self-perturbation and increase the sensitivity of the internal electromagnetic sensors. Dynamic control of the shielding effectiveness of the fabricated screen, whose optical transparency is close to 85% over the entire visible light spectrum, is fully demonstrated. A shielding effectiveness contrast ranging from 5 dB to 24 dB between the ON and OFF diode states was measured in the 2-10.5 GHz frequency range in a reverberation chamber.

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Flexible and Transparent EMI Shielding Materials

Cited by 7 publications

References 36 publications

Preparation and Characteristics of High-Performance, Low-Density Metallo–Ceramics Composite

Preparation and Characteristics of High-Performance, Low-Density Metallo–Ceramics Composite

Auto-activated Electromagnetic Shield Upon High Intensity Radiated Field Illumination

Dynamic Control of the Shielding Effectiveness of Optically Transparent Screens

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