How does the shielding principle of shielded cable work?

I. How is the shielding principle of shielded cable? Shielded cable is a kind of conductive shielding cable called shielded cable, the wrapped wire is called shielding layer, generally braided copper mesh or copper berth (aluminum), the shielding layer needs to be grounded, and the external interference signals can be imported into the ground. Its function is to avoid interfering signals from entering the inner layer, while reducing the loss of transmitted signals. Shielded cable has a common structure and advanced structure, the common structure for the insulation layer + shield + wire, the structure is insulation layer + shield + signal wire + shield grounding wire. Shielded cabling system originated in Europe. It adds a metal shielding layer to the outside of the ordinary unshielded wiring system. It utilizes the reflection, absorption and skin tilt effects of the metal shield to prevent electromagnetic interference and electromagnetic radiation. The shielding system integrates the balancing principle of twisted pair cable and the shielding function of the shielding layer, which has good electromagnetic compatibility (EMC) characteristics. The shielding principle of shielded cables differs from the balanced offset principle of twisted pair cables. Shielded cable is in the four pairs of twisted-pair cable outside the addition of a layer or two layers of aluminum foil, the use of metal on the electromagnetic wave reflection, absorption and skin contraction effect principle (the so-called skin contraction effect refers to the distribution of the current in the cross-section of the conductor, with the increase in frequency, the distribution of the conductor surface tends to be, the higher the frequency, the smaller the depth of the skin contraction, i.e., the higher the frequency, the weaker the ability to penetrate the electromagnetic wave), effectively preventing the external electromagnetic interference Into the cable, to prevent internal signal radiation, interference with the work of other equipment.

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