A Pomegranate‐Like Nanolayer Featuring A Core‐Shell Architectural Design for Thermal‐Mechanical‐Electromagnetic Responses and Sensor
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Abstract Multifunctional electromagnetic wave (EMW) absorbing materials are attracting attention because of their potential applications in medical, livelihood, and military. In this study, a pomegranate‐like nanolayer featuring a core‐shell architecture (PNCS) is prepared using a confinement strategy. Introducing metal atoms into this unique pomegranate‐like design (M‐PNCS, M = Mn, Fe, Co, Ni, and Cu) effectively tuned the electromagnetic response and improved the electromagnetic functions. The Mn‐PNCS composite exhibited the highest electromagnetic absorption. Its reflection loss ( RL ) reached −62.39 dB with an effective absorption bandwidth (EAB) at 1.8 mm of 6.0 GHz. As the charge transport capacity of the Mn‐PNCS increases, its absorption can be transformed into shielding, with a green shielding index of up to 3.54. On this basis, Mn‐PNCS is used to fabricate a multifunctional film and a new design of strain sensor. This multifunctional film integrated electromagnetic absorption, thermal insulation, hydrophobicity, flexibility, and sensing, thus showing potential for use in wearable electromagnetic protective clothing. In addition, the sensors in the simulation design achieved strain sensing through the coupling effect between the Mn‐PNCS patterns. These findings demonstrate that Mn‐PNCS is an excellent multifunctional material with potential applications in the technical fields of EMW absorption, electromagnetic shielding, and wearable devices.Keywords:
Reflection loss
Electromagnetics
The paper deals with the evaluation of shielding effectiveness of different types of paints, which is recommended as a shielding. There is performed an experiment on the creation of a non-professional shielding paint that could be used as a substitute for the professional shielding paints, that are commonly available on the market. The measurement is performed in the frequency range 0.9 - 6 GHz.
Shielding effect
Electromagnetic Compatibility
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A general review of conventional magnetic shielding is presented. Several possible definitions of the term 'shielding factor' are given, taking into account the ferromagnetic nature of shielding materials. An alternative treatment of single-layer axial shielding for a cylindrical shield is presented and compared to a previous approximation. A new algorithm for calculating multi-layer axial shielding factors is derived and shown to be an improvement on existing methods when applied to some assemblies, including one reported for the first time.
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Nanomaterials
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To research the relation between the structure of the shielding fabric and the shielding effectiveness for the design of electromagnetic shielding tent,the simplified equivalent model of the shielding fabric was established.The shielding effectiveness of the single-layer and double-layer shielding fabric was cal culated with FDTD method.There was a good agreement between the numerical results and the experimental results.The numerical results show that the shielding effectiveness of the doublelayer shielding fabric is higher than that of the single-layer shielding fabric in the frequency domain of 10 GHz.The catastrophic resonance phenomenon of the double-layer shielding fabric was analyzed and the measure of the deleting resonance was proposed.
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In this paper, fabric density influence on the shielding effectiveness of electromagnetic shielding fabric is studied. A series of blended shielding fabrics are tested using a waveguide tube testing method to obtain the shielding effectiveness with different density. Experimental results show that the shielding effectiveness increases with the increase of fabric density, and there are two rapid increasing regions and one stable region. Then we propose a theory that the shielding effectiveness variation is described by adjacent form of yarns. This method can provide theoretical reference for the development of the electromagnetic shielding fabric and related theoretical research. Streszczenie. W artykule opisano zagadnienie wplywu zwartości tkaniny oplotu ekranu na skutecznośc ekranowania elektromagnetycznego. Wysunieto zostala teoria, ze rodzaj stosowanej przedzy ma wplyw na zmiane skuteczności ekranowania. (Wplyw zwartości tkaniny oplotu ekranu na skutecznośc ekranowania elektromagnetycznego)
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Abstract The formulation of actual shielding problems in mathematical form is the first step of any shielding analysis. In this chapter, the main electromagnetics equations and theorems in both the frequency and time domains are presented for formulating and solving shielding problems in the most convenient way. Basic shielding mechanisms and the reciprocity theorem for an insight into the dual configurations exhibiting the source inside or outside the shielding configuration are also presented.
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Abstract The sections in this article are Elf Shielding Versus High‐Frequency Shielding Magnetic Fields Shielding Mechanisms Shielding Materials Shielding Calculations Numerical Solutions for Shielding
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Reflection loss
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The paper introduced the shielding theory and shielding efficiency test of microwave-shielding fabrics,then point out the protective fabrics is effective for shielding microwave radiation,then give some advice in using the protective fabrics.
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A new shielding electromagnetic fabric is different from traditional shielding electromagnetic materials. Its shielding effectiveness could not be estimated exactly by traditional shielding electromagnetic theory. However, the shielding effectiveness was characterized by experimental method and depends on different radiation resources and the incidence angles of electronic waves. The difference of shielding effectiveness between in weft and in warp of fabric is obvious.
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Electromagnetic Compatibility
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