Electromagnetic interference shielding of segregated polymer composite with an ultralow loading ofin situthermally reduced graphene oxide
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An in situ thermally reduced graphene/polyethylene conductive composite with a segregated structure was fabricated, which achieved a high electromagnetic interference shielding effectiveness of up to 28.3–32.4 dB at an ultralow graphene loading of 0.660 vol.%. Our work suggests a new way of effectively using graphene.We have studied experimentally the shielding method of ELF magnetic field applied to the source of line conductors. For the single-phase line current, it appears to be difficult to achieve the effective shielding. On the other hand, for the balanced 3-phase conductors, including triangle and twisted configuration, a certain reduction of generated magnetic field was achieved by adjusting the configuration of conductors or by surrounding the conductors with cylindrical shielding materials made of ferromagnetic materials or non-ferromagnetic metals. Normalized characteristics between phase current, distance between source current and observation point, distance between phase conductors, and the pitch of twisted cable were derived. In addition, the effect of unbalanced current was also investigated.
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Flexible and wearable electromagnetic interference (EMI) shielding material is one of the current research focuses in the field of EMI shielding. In this work, for the first time, WS2-carbon fiber (WS2-CF) composites are synthesized by implanting WS2, which has a multiphase structure and a large number of defects, onto the surface of carbon fiber (CF) by using a simple one-step hydrothermal method, and are applied to protect electronic devices from EMI. It is found that the EMI shielding performance of WS2-CF is significantly improved, especially for those at S and C-bands. At 2 GHz, the EMI shielding efficiency could reach 36.0 dB at a typical thickness of 3.00 mm of the composite, which is much better than that of pure CF (25.5 dB). Besides paving a novel avenue to optimize the electromagnetic shielding performance of flexible and wearable CF-based EMI shielding materials, which have great potential in the practical application for EMI shielding, this work provides a new paradigm for the design and synthesis of EMI shielding materials which have a broad application prospect.
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This paper presents a review summary of radiated emission and interference shielding methodologies currently describes in brief on Electromagnetic interference measurement system allow measurement and reducing of electromagnetic interference by using electromagnetic interference shielding effectiveness. To use shielding technique as a coaxial holder with uniform diameters that maintains 50 ohm impedance throughout the length of the device. The EMI tester was calibrated and the shielding effectiveness of common and new materials was determined through several experiments.
Electromagnetic Compatibility
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The elementary principles of electromagnetic interference(EMI) shielding are introduced.A review is given on the research progress of polypyrrole composites in EMI shielding and the shielding performance of the polypyrrole composites are also discussed.In addition,the development trend of polypyrrole in EMI shielding materials is forecast.
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Increasingly serious electromagnetic wave pollution puts forward higher requirements for efficient and widely applicable electromagnetic interference (EMI) shielding materials. Herein, aristate sphere Ni@Carbon fibers were synthesized through an in-situ ultrasonic reduction method. The phase structure, morphology, magnetic, electrical conductivity and EMI shielding performances of the specimens were analyzed by various technologies. Experimental results revealed that the introduction of magnetic aristate sphere Ni endowed the carbon fibers with an outstanding EMI shielding effectiveness (SE) of 38.5 dB (99.9% attenuation) and specific shielding effectiveness (SSE/T) of 642 dB cm2/g. The advanced EMI shielding performances of aristate sphere Ni/Carbon fibers could originate from the synergistic effect of high electrical conductivity, well magnetic loss, and multiple electromagnetic reflection. Consequently, aristate sphere Ni@Carbon fibers would be an ideal candidate as light-weight, high-efficiency and widely applicable EMI shielding materials in electromagnetic shielding applications fields.
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Conducted electromagnetic interference
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Conductive concrete mixtures have been designed and demonstrated to perform electromagnetic shielding. This paper describes the design, testing methods, and results obtained from the development of conductive concrete construction for structured electromagnetic shielding.
Electromagnetic Compatibility
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We have studied experimentally the shielding method of ELF magnetic field applied to the source of line conductors. For the single-phase line current, it appears to be difficult to achieve effective shielding. On the other hand, for the balanced three-phase conductors, including triangle and twisted configuration, a certain reduction of generated magnetic field was achieved by adjusting the configuration of conductors or by surrounding the conductors with cylindrical shielding materials made of ferromagnetic materials or nonferromagnetic metals. Normalized characteristics between phase current, distance between source current and observation point, distance between phase conductors, and the pitch of twisted cable were derived. In addition, the effect of unbalanced current was also investigated. © 2000 Scripta Technica, Electr Eng Jpn, 131(2): 12–19, 2000
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Integrated circuits (IC) operate in increasingly complex environments in terms of electromagnetic compatibility (EMC). Over time, ICs have implemented certain features that enable higher performance. Among these features, it is worth mentioning the use of higher frequencies, which are often electromagnetic interferences (EMI) sources. In addition, the device size reduction makes it difficult to introduce some specific elements to avoid EMC problems. For this reason, using board-level shielding (BLS) solutions can solve many problems. One of the most widespread methods, shielding cabinets, is discussed in this paper. Shielding cabinets are a kind of metal box that encloses the IC and insulates it. It can enclose the EMI source as well. The objective of this paper is the characterization of different models of shielding cabinets up to 5 GHz. The cabinets are characterized through two experimental measurements and a group of simulations.
Electromagnetic Compatibility
Conducted electromagnetic interference
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With rapid development of 5G communication technologies, electromagnetic interference (EMI) shielding for electronic devices has become an urgent demand in recent years, where the development of corresponding EMI shielding materials against detrimental electromagnetic radiation plays an essential role. Meanwhile, the EMI shielding materials with high flexibility and functional integrity are highly demanded for emerging shielding applications. Hitherto, a variety of flexible EMI shielding materials with lightweight and multifunctionalities have been developed. In this review, we not only introduce the recent development of flexible EMI shielding materials, but also elaborate the EMI shielding mechanisms and the index for "green EMI shielding" performance. In addition, the construction strategies for sophisticated multifunctionalities of flexible shielding materials are summarized. Finally, we propose several possible research directions for flexible EMI shielding materials in near future, which could be inspirational to the fast-growing next-generation flexible electronic devices with reliable and multipurpose protections as offered by EMI shielding materials.
Electromagnetic Compatibility
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Due to substantial development of electronics and telecommunication techniques, materials with electromagnetic interference (EMI) shielding performance are significant in alleviating the interference impacts induced from a remarkable variety of devices. In the work, we propose novel sandwich structures for manipulating the EM wave transport, which holds unique EMI shielding features of frequency selectivity. By employing electrical and magnetic loss spacers, the resultant sandwich structures are endowed with tunable EMI shielding performance, showing substantial improvements in overall shielding effectiveness along with pronounced shielding peak shift. The mechanisms suggest that the multiple interfaces, electromagnetic loss media, and changes of representative EM wavelength could be critical roles in tailoring the EMI shielding performance. The results provide a versatile strategy that could be extended in other frequency ranges and various types of sandwich structures, promising great opportunities for designing and fabricating advanced electromagnetic attenuation materials and devices.
Electromagnetic Compatibility
Conducted electromagnetic interference
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