The electromagnetic shielding room is a new device that conforms to the development of modern science and technology, which can effectively isolate electromagnetic radiation and has a pivotal position in scientific and technological production. The function of the electromagnetic shielding room is to isolate external electromagnetic interference and ensure the normal operation of indoor electronic and electrical equipment. Prevent information leakage of electronic communication equipment and ensure information security. It also plays an important role in the protection of state secrets. Preventing environmental pollution is also a major feature of it. How does the electromagnetic shielding room design better meet the needs of use?
First of all, the structure of the shielding room should be hexahedron, and the electrical connection performance between the shielding components is good, which is to prevent the occurrence of field leakage. The influence of shielding materials on reflection attenuation is also quite significant. Considering that the welding between the screen wall and the screen wall of the shielding room is likely to cause discontinuity; the setting of the shielding room's doors, windows, lighting and pipes all have a significant impact on the shielding effectiveness. Improper handling of the structure of the shielding room will have a serious impact on the shielding effectiveness.
Secondly, the electromagnetic shielding room must have good corrosion resistance and sufficient mechanical strength, and at the same time, it must be easy to install and low in cost. The reflection attenuation of the shielding room is completely determined by the mismatch of the wave impedance when electromagnetic waves enter the shielding shell, that is to say, it depends on the difference between the wave impedance of the air and the wave impedance of the shielding shell. Different types of electromagnetic waves, even in the same frequency range, produce reflection attenuation, the difference is very large.
Finally, steel is selected as the far-field shielding material. When the thickness is small and the frequency is low, the shielding effectiveness of steel is smaller than that of copper; when the thickness is large and the frequency is high, the shielding effectiveness of steel is greater than that of copper. Therefore, when the thickness of the board is above 0.67mm and the electromagnetic radiation frequency is above 10Hz, the shielding effectiveness of steel is better than that of copper. Copper is used as the near-field shielding material. Since the near-field is an electromagnetic induction field, usually the electric field has a large component. Therefore, according to the principle of electromagnetic shielding, it can be known that metal with high conductivity should be used as the shielding material. For the best.
There are also many common structures in electromagnetic shielding rooms. The plate-type shielding room is shielded by a whole metal plate, and the induced current is distributed on the entire surface of the shield. The inductance ratio encountered by the current is concentrated on the metal mesh. The inductance encountered by the current is small; the metal mesh framework of the mesh shielded room is well connected with copper tape and other conductors. This structural type of shielded room can be disassembled and assembled, has a simple structure and low cost, and is generally called an assembled mesh shielded room. The application of electromagnetic shielding room will have a better prospect in the future development.