Advanced materials and design for electromagnetic by Xingcun Colin Tong

By Xingcun Colin Tong

With electromagnetic compliance (EMC) now a significant component within the layout of all digital items, it is necessary to appreciate how electromagnetic interference (EMI) defensive items are utilized in numerous industries. concentrating on the practicalities of this region, Advanced fabrics and layout for Electromagnetic Interference Shielding comprehensively introduces the layout guidance, fabrics choice, characterization method, production know-how, and destiny strength of EMI shielding.

After an outline of EMI defensive concept and product layout guidance, the publication largely experiences the characterization method of EMI fabrics. next chapters concentrate on specific EMI protecting fabrics and part designs, together with enclosures, metal-formed gaskets, conductive elastomer and versatile graphite elements, conductive foam and air flow buildings, board-level protective fabrics, composite fabrics and hybrid buildings, absorber fabrics, grounding and cable-level protecting fabrics, and aerospace and nuclear protective fabrics. The final bankruptcy provides a viewpoint on destiny traits in EMI protective fabrics and design.

Offering particular assurance on many very important themes, this integral publication illustrates the potency and reliability of more than a few fabrics and layout suggestions for EMI protecting.

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Indd 20 10/10/08 10:56:36 AM Electromagnetic Interference Shielding Fundamentals and Design Guide 21 Conductive panel with apertures. 25) where w and h are slot width and height in mm; and t is the depth of slot, usually thickness of material in mm. 26) where w is length of slot (meters) and w > h and w >> t; l is wavelength in meters; and n is number of apertures within l/2. 28) where d is diameter in mm; t is the depth of hole, usually thickness of material in mm. 29 can be solved in terms of width (w) or diameter (d) to determine what size aperture is required for a given attenuation.

However, if it is found that enclosure shielding is required, designing the enclosure to meet the EMC requirements will minimize the level of the shielding design and associated cost. A shielded enclosure should be fabricated from materials that possess the desired physical and electrical characteristics, and conform to environment compliance. indd 27 10/10/08 10:56:40 AM 28 Advanced Materials and Design for Electromagnetic Interference Shielding effectiveness by proper seam treatment, and use of EMI shielding gaskets, vent/ window screening, and shielding/filtered leads.

There is a distinct advantage to parallel force alignment because it eliminates the requirement for multiple, evenly spaced fasteners to maintain the gasket compression. In either case, with a spring finger configuration, there will be shear forces developed because the shield and gasket surfaces will slide across each other. Since the surface of spring alloys like CuBe is very hard compared to the oxidation or corrosion films, the gasket and mating surfaces form a self-cleaning contact. Knitted wire mesh or conductive elastomers cannot be used in shear.

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