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Is the poor shielding effect of the shielded room related to the shielding material?

Author:admin   AddTime:2021-04-28

In daily life, there are too many interference sources that can produce electromagnetic interference. Under common circumstances, lightning is the most common interference source that can produce electromagnetic interference. However, it is not just lightning that can produce interference sources. Some high-voltage and high-frequency transmission lines, high-power motors, computer hosts, etc. may generate electromagnetic fields as long as there is current passing through. Of course, under different circumstances, the intensity of the electromagnetic field is also different. To deal with this problem, it is necessary to use a shielded computer room. Because the shielding materials are different, people have also raised questions about whether the shielding effect of the shielded room is related to the shielding material.

The relationship between the shielding room effect and the material; when the shielding material is metal plate, its shielding effect: At=8.68t/δ+20lg{(Z0+Z3)2/4Z0ZS} dB can be known from the above formula, when the metal plate is known With the material and thickness, the shielding effect at different distances, different frequencies, and different field sources can be calculated. If δ=0.5mm steel plate is selected, its shielding effect at different field sources and different frequencies is ≥120dB. This project selects steel plates with thickness δ=2mm and 3mm. Every seam and discontinuity between the bottom plate and the case should be overlapped as best as possible.

The degree of overlap plays a decisive role in the shielding effectiveness of the shell; when the shielding, ventilation and strength requirements are high and the quality is not critical, use honeycomb panels to shield the vents. It is best to use welding to maintain the wire connection to prevent leakage. Where possible, joints should be welded. In the case of restricted conditions, spot welding, riveting with a small pitch and fixing with screws can be used. When lapped with screws or riveting, first lap in the middle of the seam, and then gradually extend to both ends to prevent bending of the metal surface. When no conductive gasket is added, the screw spacing should generally be less than the highest operating frequency. 1%, at least not more than 1/20 wavelength;



Of course, the effect of the shielding room must be related to the shielding material. The relationship between them is shown in: According to current technology, the shielding material is generally a metal plate, and the thickness of the metal plate is different, and the shielding effect at the same distance, different frequencies, and different field sources is also different. And different types of metal materials will also bring different shielding effects.

Of course, this also requires the construction personnel of the shielded room to choose different shielding materials in the process of designing and constructing the shielded room, in order to better realize the different needs of different units using the shielded room.

Absorbing Material:https://www.goodsmaterial.com/

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