As different places have different requirements for shielding, in order to meet people's different shielding needs, the level of shielding technology is gradually improving. With wifi jammer, because the shielding materials will be different, people have also raised questions about whether the shielding effect of the jammer is related to the shielding materials.
What will affect the effectiveness of the shielding material?
(1) The better the electrical conductivity and magnetic permeability of the material, the higher the shielding efficiency, but the actual metal material cannot take into account these two aspects. For example, copper has good electrical conductivity, but poor magnetic permeability; Good, but less conductive. What material should be used, depending on the specific shielding mainly depends on reflection loss or absorption loss to decide whether to focus on electrical conductivity or magnetic permeability;
(2) Electric field waves are easy to shield, plane waves are second, and magnetic field waves are very difficult to shield. Especially (below 1KHz) low-frequency magnetic field, it is difficult to shield. For low-frequency magnetic fields, high magnetic permeability materials should be used for shielding. Several conditions affect the effect of shielding materials, and even a combination of highly conductive materials and high magnetic permeability materials is used.
(3) When the frequency is low, the absorption loss is very small, and the reflection loss is the main mechanism of the shielding effectiveness, and the reflection loss should be improved as much as possible;
(4) The reflection loss is related to the distance from the shield to the radiation source. For the electric field radiation source, the closer the distance is, the greater the reflection loss; for the magnetic field radiation source, the closer the distance is, the smaller the reflection loss; The nature, determining whether it should be close to the shield, or the principle shield, is an important part of the structural design.
(5) When the frequency is high, absorption loss is the main shielding mechanism, and it has little to do with whether the radiation source is an electric field radiation source or a magnetic field radiation source.
(6) The reflection loss is related to the characteristics of the radiation source. For the electric field radiation source, the reflection loss is large; for the magnetic field radiation source, the reflection loss is very small. Therefore, the shielding of the magnetic field radiation source mainly depends on the absorption loss of the material, and the material with higher magnetic permeability should be selected as the wifi frequency jammer material.
