The after service net of aoxiang cell phone jammer

If a good conductor shield grounded, then it also has high-frequency magnetic field shielding and shielding effect. Frequency of 500kHz ~ 30MHz range, optional aluminum shielding materials, and when the frequency is greater than 30MHz, it can optionally aluminum, copper, copper silver and so on. Incorrect good conductor shield material on the right openings or cracks try not to cut off the current, affecting the magnetic shielding effect. Combining with the development trend of mobile mechanics of communication in the future, cell phone jammer company has built its own brand.Permeability changes with field strength magnetic flux density B = B / H saturation maximum permeability initial permeability of the magnetic field strength H magnetic field shielding the high magnetic permeability material: saturated low permeability materials: low-permeability screen effect is not enough material of high permeability materials, how to shield low-frequency magnetic field? Low-frequency magnetic field high-frequency high-conductive material conductive materials to absorb losses small reflection loss of small electromagnetic shielding material of high permeability magnetic shielding and electric field, magnetic field shielding different.The cell phone jammer company adopts advantages of other firms. Electromagnetic shielding to prevent electromagnetic shield is spread in space, a measure electromagnetic field in the electromagnetic field through a metal or a dampening effect on the barrier layer, it will be a certain degree of attenuation that produces shielding effect. The mechanism is electromagnetic energy when passing through the shield with the loss, this loss can be divided into two parts: the reflection loss and absorption loss. When the incident electromagnetic wave reflection loss is a different medium to the interface occurs when the reflection, so that electromagnetic energy across the interface decreased. As a result of reflection phenomenon known as the reflection loss of electromagnetic energy loss. Absorption loss in electromagnetic wave shielding material is spread, there will be some of the energy converted into heat, leading to electromagnetic energy, the loss of this part of the energy absorption loss as shielding material. Skin effect of electromagnetic wave attenuation conductive medium, with the frequency, magnetic permeability, conductivity increases. The cell phone jammer firm absorbs advices from customers.In a good conductor of electromagnetic waves exist only on the surface. Skin Deep: δ = (2 ωγ) 1 2 shielding electromagnetic shielding pre-masked field strength E1 E2 of the electromagnetic field strength attenuation function is to generate electromagnetic shielding, electromagnetic shielding effect of the size of the shielding effectiveness measurement: SE = 20 lg (E1 / E2) dB shielding attenuation of the relationship between performance and shielding effectiveness of 20 dB 40 dB 60 dB 80 dB 100 dB 120 dB the original field strength 111 111 masked field strength 0 0.1 0.01 0.001 .0001 0.00001 0.000001 attenuation 90% 99% 99.9% 99.999% 99.999% 99.99% shielding effectiveness of solid materials, the incident wave field strength B calculated absorption loss A R1 R2 from SE = R1 + R2 + A + B, R1, R2 represent two surface reflection loss, A is the shield of the absorption loss, B Loss on behalf of multiple reflections, A bigger, B is smaller.cell phone jammer company has built and developed a series of cell phone jammer. The key to the shielding design and electromagnetic waves can provide the majority of metal shielding effectiveness of more than 100dB. However, in practical engineering, to achieve more than 80dB shielding effectiveness is very difficult. Because the shield of shielding effectiveness depends not only on the material composition of the shield, but also on the shield structure.
Shield electromagnetic shielding to meet the two basic principles: 1. Conductive shield continuity: refers to the entire shield must be a complete, continuous conductor.