What is shielded wire and what does it do?

I. What is a shielded cable and its role?1. What is a shielded cable? Shielded wire is the use of mesh braided wire to the signal line wrapped up the transmission line. Conductor outside the conductor wrapped wire called shielded wire, wrapped conductor called shielding layer, generally woven copper mesh or (aluminum), shielding layer needs to be grounded, external interference signals can be introduced into the earth by the layer, to avoid interfering signals into the inner layer of the conductor to dry together while reducing the loss of the transmission signal. Shielded cable shield is mainly made of copper, aluminum and other non-magnetic materials, the effect of the shield is not mainly due to the metal body itself on the electric field, magnetic field reflection, absorption, but due to the shielding layer of the grounding, grounding in different forms will directly affect the shielding effect. 2. The role of shielding wire shielding layer generally need to be grounded. The role of the shielding line is the electromagnetic field noise source and sensitive equipment isolation, cut off the propagation path of the noise source. Shielding is divided into active shielding and passive shielding, active shielding is designed to prevent the noise source to the outside radiation, is the source of the noise shielding; passive shielding is designed to prevent sensitive equipment from being interfered with by the noise source, is the sensitive equipment shielding.

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