Home > categories > Construction & Real Estate > Metal Mesh > Four layer shielded cable TV line, which layer of metal mesh
Question:

Four layer shielded cable TV line, which layer of metal mesh

nan

Answer:

Metal shield and the shield is not accessible, otherwise it will not be shielded!The reason why the metal shield can be shielded is the outer layer of the wire mesh.
It's like filling a rubber in a crevice in a fluid container. The utility model relates to an elastic conductive filling material. In many literature, electromagnetic shielding body compared to liquid sealed containers, appear only when the conductive elastic material will seal a gap watertight degree to be able to prevent the leakage of electromagnetic waves. In fact, this is not true. Because the gap or hole will leak electromagnetic waves, depending on the size of the gap or hole relative to the electromagnetic wave length. When the wave length is larger than the opening size, no obvious leakage occurs.
Many people do not understand the principle of electromagnetic shielding, as long as the use of metal to make a box, and then the box to the ground, it can play the role of electromagnetic shielding. Under the guidance of this concept, the result is failure. Because the electromagnetic shielding and the shielding of the ground or not. There are only two factors that affect the shielding effectiveness of the shield: one is that the surface of the shield must be electrically conductive, and the other is a conductor that cannot penetrate the shield directly. There are many discontinuous points on the shield, and the most important one is the non conductive gap formed by the different parts of the shield. These non conducting gaps create an electromagnetic leakage, as the fluid leaks from the slot on the container. One way to solve this problem is to fill the gap with conductive elastic material to eliminate the non conducting point.

Share to: