Mobile phone jammer high-frequency electromagnetic shielding

cell phone jammerapplies professional surface mount welding technology. Three kinds of common shielding to prevent external electromagnetic field into an area to be protected. They are using the shield (with specific properties of the material) to prevent electromagnetic interference or attenuation of energy transfer, is an important means of suppression of electromagnetic interference.
In fact, for very slow changes (eg, 50Hz) AC, the electric field around it and the electrostatic field is almost the same, but the charge distribution of periodic changing it.
However, due to shielding of the different characteristics of the field, thus shielding requirements are not the same. 2.1 The purpose of electrostatic shielding electrostatic shield to prevent external electrostatic field into an area.
2.3 low-frequency magnetic shielding for the magnetic field near the low frequency disturbance source (AC or DC power cord, power transformers, motors, relays, etc.), in order to protect sensitive magnetic equipment for the TF often work, the magnetic bypass is another kind of very effective shielding method, shown in Figure 4 where the magnetic field to provide a magnetoresistive ~ E4-, the channel will be bound by the magnetic field lines in this low reluctance path, so that the magnetic field sensitive devices from harassment. Then, the abrupt radiation can not be formed due to cell phone jammer. Can draw the following conclusions:
a). Low frequency, high magnetic permeability material above the tunnel shielding effectiveness of high conductivity material, but when the frequency is high, the high conductivity material may be higher than the magnetic shielding effectiveness of high permeability material.
When high-frequency conductive material has a high shielding effectiveness, the reason is: the frequency increases, lower permeability, higher acoustic impedance, reflection loss increases.namely, metal sources of electromagnetic interference shielding materials will be closed up to an external electromagnetic field strength less than the allowable value of a measure; or metal shielding materials sensitive to electromagnetic circuit closed, its internal electromagnetic field strength less than the allowable value of a measure. 2 Classification of electromagnetic shielding electromagnetic shielding can generally be divided into three categories: static shielding, static magnetic shielding and mobile phone jammer high-frequency electromagnetic shielding.