In order to protect the space between the two regions that block the metal, to control the electric and magnetic fields and the electromagnetic waves and radiation induced by one region to the other. More precisely, the shielding layer is surrounded by a set of component circuits, i.e. interference sources, cables or the entire system are used simultaneously to prevent the electromagnetic field from diffusing to the outside; the receiving circuit, the surrounding equipment or system is shielded to protect them from the electromagnetic field External influence. Because shielding electromagnetic interference from external electromagnetic waves and internal wires, cables, components, circuits or systems are games of energy absorption (eddy current loss), reflected energy (electromagnetic waves reflected at the screen interface) and offset energy (opposite to the shielding layer) The magnetically induced power generated in the electromagnetic direction) can be partially compensated by:
When a high-frequency electromagnetic field occurs, a low-resistivity electromagnetic wave generated by an eddy current metal material is used to prevent foreign matter in the form of an electromagnetic wave, thereby achieving a shielding effect. When low-frequency electromagnetic interference is used, materials with high magnetic permeability are used to limit the magnetic flux inside the shield to prevent diffusion of the protected space. In some cases, if the conditions required for high frequency and low electromagnetic fields have good protection, they usually consist of multiple metal shielding layers and use different materials.
Many people do not understand the principle of electromagnetic shielding. As long as the metal box and the box are grounded, they can serve as electromagnetic shielding. Under this concept is the result of failure. Because the electromagnetic shielding has nothing to do with whether the shield is grounded. There are only two factors that affect the practical effectiveness of protective shielding: one shielding surface must be continuously conductive, while the other conductor cannot penetrate the shielding directly. There are many points on the discontinuous conductive shield, the most important of which is the non-conductive space formed by connecting different parts of the wifi jammer. Non-conductive differences can cause electromagnetic leakage because fluid can leak from the same location on the container. One way to address this leak is to fill the space with a conductive elastic material to eliminate non-conductive points. For the same reason, this filled rubber acts as a fluid container in the space. This conductive filling material is an elastic electromagnetic seal.