What is the type of electromagnetic shielding of conductors?
First, the classification of electromagnetic shielding principle
According to the shielding principle, electromagnetic shielding can be divided into electric field shielding, magnetic field shielding and electromagnetic shielding. wireless jammer
1. Electric field shielding is mainly used to prevent capacitive coupling between original electronics or equipment. It uses a metal shielding layer to wrap the electronic device or equipment. The shielding body is made of good conductors and has good grounding, so that the electric field is limited Conductor surface, and neutralize the induced charge on the conductor surface through the ground wire to prevent mutual interference caused by electrostatic coupling.
2. Magnetic field shielding is to prevent the internal magnetic field from spreading out or external magnetic field interference by enclosing the magnetic field lines in the shielding body, and providing a low reluctance path for shielding the internal and external magnetic fields, so as to realize the magnetic field shunting. The magnetic shield can effectively suppress the interference caused by the magnetic field coupling between the noise source and the sensitive device.
3. Electromagnetic shielding is mainly used to prevent high-frequency electromagnetic induction. It uses the reflection of electromagnetic waves on the surface of the conductor and the severe attenuation of the propagation in the conductor to isolate the coupling between variable electromagnetic fields, thereby preventing the interference of high-frequency electromagnetic fields.
At present, different electromagnetic shielding materials have been studied according to different electromagnetic shielding principles. Surface layer conductive shielding materials, filled composite electromagnetic shielding materials, characteristic conductive polymers, conductive fabrics, transparent conductive films, etc. are all common electromagnetic shielding materials on the market.
Second, the electromagnetic shielding principle of conductive cloth
In objects shielding electromagnetic signals, there are often many discontinuous conductive points. Therefore, to shield electromagnetic signals, these non-conductive points must be removed. Because gaps are like fluids, in the process of eliminating these conductive discontinuities, electromagnetic signals will leak due to the existence of gaps. Therefore, in order to shield, elastic conductive materials must be used to cover the gaps where electromagnetic signal leakage may occur in these gaps. to be patched.
Metal nickel is converted into polyester by special chemical deposition method or physical method, 5 layers of nickel are repeatedly plated, and a layer of copper with high conductivity can fill these gaps, making the conductive cloth material with excellent conductivity and electromagnetic shielding.