The shield is a metal separation between two spatial regions to control the induction and radiation of electric, magnetic and electromagnetic waves from one region to another. Simply put, shields are used to enclose the components, circuits, assemblies, cables, or interference sources of the entire system to prevent interference with electromagnetic fields. The shields are used to surround the receiving circuits, devices, or systems to prevent them from being exposed to the outside world. The influence of the electromagnetic field is because the shield absorbing energy (eddy current loss) and reflected energy (interfacial reflection of electromagnetic waves on the shield) on the external electromagnetic waves and internal electromagnetic waves from wires, cables, components, circuits or systems. The offset energy (electromagnetic induction generates a reverse electromagnetic field on the shield to cancel part of the interference electromagnetic wave), so the shield has the function of reducing interference.
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