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The relationship between the effect of electromagnetic shielding cabinet and the material

Author:admin   AddTime:2021-04-17

The use of electromagnetic shielding cabinets can also play a shielding effect. For electromagnetic shielding cabinets, its shielding effect has a lot to do with the material. Why? Let's talk about the effects and materials of electromagnetic shielding cabinets. The relationship between.

The relationship between the effect of the electromagnetic shielding cabinet and the material:

When a metal plate is used as the shielding material, its shielding effect: At=8.68t/δ+20lg{(Z0+Z3)2/4Z0ZS} dB is known from the above formula. When the material and thickness of the metal plate are known, it can be calculated Shielding effect at different distances, different frequencies, and different field sources. If δ=0.5mm steel plate is selected, its shielding effect at different field sources and different frequencies is ≥120dB. This project selects steel plates with a thickness of δ=2mm, 3mm

This is the relationship between the effect of the electromagnetic shielding cabinet and the material. More often you can analyze and introduce it according to the actual situation. All we need to know is to choose the shielding material. Then the shielding effect of the electromagnetic shielding cabinet is naturally relatively to be compared. it is good.

The electrical conductivity and magnetic permeability of metal materials are not fixed and will change with changes in the applied electromagnetic field, frequency, and temperature. The frequency characteristics of materials of different thicknesses are also different. For example, high-conductivity materials have the following properties:

1. Magnetic permeability decreases with increasing frequency.



2. The material with high magnetic permeability will greatly lose its magnetism under the condition of mechanical impact, resulting in the decrease of shielding effectiveness. Therefore, the shielding body must undergo heat treatment after mechanical processing, such as tapping, welding, bending, drilling, etc. In order to restore its magnetism, this process is called Eel Kui Touching.

3. The magnetic permeability is also related to the intensity of the applied magnetic field. When the intensity of the applied magnetic field is low, the magnetic permeability increases with the enhancement of the applied magnetic field; when the intensity of the applied magnetic field exceeds a certain level, the magnetic permeability drops sharply and the material is saturated. Once saturated, the magnetic shielding effect is lost. The higher the permeability of the material, the easier it is to saturate.

Therefore, in a strong magnetic field, high permeability materials may not have good shielding performance. When selecting shielding materials. The key point is to select materials that have appropriate saturation characteristics and sufficient magnetic permeability at the same time, or when a material shield is difficult to meet the shielding effectiveness, double-layer shielding or multi-layer shielding must be adopted.

Electromagnetic shielding cabinets require high-permeability materials, especially at low frequencies, the shielding effectiveness of high-permeability materials is higher than that of high-conductivity materials. But at high frequencies. The shielding effectiveness of high-conductivity materials may be higher than that of high-permeability materials. When the frequency increases. The absorption loss increases, the magnetic permeability decreases, the wave impedance increases, and the reflection loss increases, so the shielding effectiveness is high.

Therefore, high-conductivity materials can be coated on the surface of high-permeability materials to increase the shielding effectiveness. The effectiveness of magnetic shielding is proportional to the thickness and permeability of the material. The permeability also has a great relationship with the frequency. Generally, it is only used below 1kHz.

Absorbing Material:https://www.goodsmaterial.com/

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