According to the actual wire diameter and aperture of stainless steel and brass wire mesh, stainless steel wire mesh and brass wire mesh with same mesh count, the shielding effectiveness of stainless steel is about 10dB higher than brass wire mesh, and when the mesh count is higher than 80, and the frequency is up to 10GHz, the shielding effectiveness of stainless steel wire mesh and brass wire mesh can be above 50dB, which can meet the general shielding requirements.
In the near field, shielding is divided into electric field shielding and magnetic field shielding, which should be considered separately.
For electric field shielding, reflection attenuation is the main factor, so shielding materials with high conductivity should be used. The electrical conductivity of brass is much higher than that of stainless steel, so the electric field shield should use brass.
For the magnetic field shielding, the absorption attenuation is very small, and the wave impedance of the magnetic field wave is very low, which determines that the reflection attenuation is also very small. When both of these parts are very small, the overall shielding effectiveness will be very low. So, shielding materials with high permeability should be used to increase absorption attenuation. The magnetic permeability of stainless steel is much higher than that of brass, so stainless steel should be used for magnetic field shielding.
In the far field, it is mainly the shielding of plane waves. In this condition, the shielding effectiveness of the shielding material must consider the effects of absorption attenuation and reflection attenuation.
It is found that if the stainless steel and brass wire mesh are in the same specification, only considering the material difference, the shielding effectiveness of brass wire mesh is slightly better than that of stainless-steel wire mesh.
However, in actual application due to the influence of processing and other properties, stainless steel and brass wire mesh with the same mesh count are different in wire diameter and aperture. In this condition, the shielding effectiveness of stainless-steel wire mesh is better than that of brass wire mesh.
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Post time: Apr-21-2023