By Xingcun Colin Tong
With electromagnetic compliance (EMC) now a significant component within the layout of all digital items, it's important to appreciate how electromagnetic interference (EMI) protective items are utilized in a number of industries. concentrating on the practicalities of this sector, Advanced fabrics and layout for Electromagnetic Interference Shielding comprehensively introduces the layout directions, fabrics choice, characterization technique, production know-how, and destiny strength of EMI shielding.
After an summary of EMI protecting conception and product layout guidance, the ebook commonly reports the characterization technique of EMI fabrics. next chapters specialize in specific EMI protecting fabrics and part designs, together with enclosures, metal-formed gaskets, conductive elastomer and versatile graphite elements, conductive foam and air flow constructions, board-level protective fabrics, composite fabrics and hybrid buildings, absorber fabrics, grounding and cable-level defensive fabrics, and aerospace and nuclear protecting fabrics. The final bankruptcy offers a viewpoint on destiny traits in EMI protective fabrics and design.
Offering distinct insurance on many vital issues, this critical e-book illustrates the potency and reliability of a number fabrics and layout options for EMI protective.
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This technique relies heavily upon circuit redesign to make the circuits less susceptible to EMI and, more importantly, to reduce the amount of EMI emissions of theses circuits. The advantage of the electronic approach is that it attacks the problem at the source, reducing the level of radiated emissions dramatically. Unfortunately, redesigning the electronic circuitry is expensive and does not protect the circuit from external interference. ). 2. Shielding. Shielding is the only noninvasive suppression technique.
A better solution is perforated metal materials commonly used in microwave ovens but now available in optical grades. As an alternative, the knitted or woven screen can be plated to improve shielding effectiveness. indd 21 10/10/08 10:56:36 AM 22 Advanced Materials and Design for Electromagnetic Interference Shielding To avoid the visual distraction from moiré patterns that result from superimposing one repetitive image over another, consideration should be given to shielding the printed circuit boards or the back side of the CRT itself.
Pulse Width Modulation for Power Converters. New York: John Wiley & Sons. Instrument Specialties. 1998. Engineering Design and Shielding Product Selection Guide (acquired by Laird Technologies). Delaware Water Gap, PA. Mardiguian, M. 2001. Controlling Radiated Emissions by Design, 2nd ed. Boston: Kluwer Academic. Molyneux-Child, J. W. 1997. EMC Shielding Materials. Oxford: Newnes. Montrose, M. I. 1999. EMC and the Printed Circuit Board. New York: Institute of Electrical and Electronics Engineers.