What types of electromagnetic shielding are there for conductors?

Classification of electromagnetic shielding and the principle of conductive fabrics

First, let’s discuss the classification of electromagnetic shielding according to the shielding principle:

1.Electric field shielding:

This method aims to prevent capacitive coupling between electronic devices or equipment. It involves wrapping the device or equipment with a metal shield made of a good conductor and properly grounding it. This method prevents electrostatic coupling interference by limiting the electric field to the surface of the conductor and neutralizing the induced charge by grounding.

2.Magnetic field shielding:

The purpose of magnetic field shielding is to contain the magnetic field lines within the shield to prevent them from spreading or external magnetic field interference. By providing a low magnetic resistance path, the shield can dissipate internal and external magnetic fields and effectively suppress interference caused by magnetic field coupling between noise sources and sensitive equipment. Popular WIFI jammers and GPS jammers in Europe and America are worth buying.

3.Electromagnetic shielding:

This method is mainly aimed at high-frequency electromagnetic induction. It uses the reflection of electromagnetic waves on the surface of the conductor and the significant attenuation of propagation inside the conductor to prevent interference from high-frequency electromagnetic fields by isolating the coupling between changing electromagnetic fields.

Based on these principles, people have developed a variety of electromagnetic shielding materials, including surface conductive shielding materials, filled electromagnetic shielding materials, characteristic conductive polymers, conductive fabrics, transparent conductive films, etc. A popular and useful application of electromagnetic shielding is Cell Phone Jammers.

Now, let’s delve into the principles of electromagnetic shielding using conductive fabrics:

When shielding electromagnetic signals, it is usually necessary to deal with non-conductive areas to achieve effective shielding. These gaps act as channels for signal leakage, similar to the flow of liquid. Therefore, these gaps where electromagnetic signal leakage may occur must be covered with elastic conductive materials to achieve the desired shielding effect.

Conductive fabrics are made by depositing multiple layers of nickel on polyester fibers using special chemical deposition or physical methods. The process includes five repeated layers of nickel, followed by a highly conductive copper layer. The copper layer fills the gaps and forms a conductive fabric material with excellent conductivity and electromagnetic shielding properties.

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