With people's gradual attention to information security, shielded rooms have been widely used. Today, the editor of the shielded room manufacturers will give everyone a general idea of how to choose the shielding shell material of the shielded room.
The main function of the shielded room is to shield the electromagnetic field, and the shielding effectiveness of the shielded room is mainly affected by the following aspects:
1. The conductivity of the selected material;
2. The permeability of the selected material;
3. The frequency of the plane electromagnetic wave;
At present, the main materials used for the shielding shell of the shielding room are aluminum plate, steel plate and copper plate. The magnetic permeability of aluminum and copper is not as good as that of steel, but its electrical conductivity is larger than that of steel plate;
a. In the case of low-frequency electromagnetic waves, the steel plate has a good shielding effect on plane waves (the skin depth of the steel plate is smaller than that of aluminum (copper))
b. For plane waves with a frequency greater than 0.01MHz, aluminum or copper has a good shielding effect. The frequency of electromagnetic waves in many occasions is greater than this frequency range, so in many occasions, you will hear that the shielding effect of aluminum plate is good.
In fact, whoever is better depends on which frequency band of the electromagnetic wave you want to shield. For different materials, the frequency of the electromagnetic wave shielded is different.