Principles, Materials, Preparation Methods, and Application Fields of Electromagnetic Noise Suppression Plates

    Electromagnetic noise suppression sheetIt is a material made based on the principle of electromagnetic wave absorption, commonly used to improve the anti-interference performance and electromagnetic wave isolation performance of electronic devices, and reduce electromagnetic radiation noise. This article will provide a detailed introduction to the principle, materials, preparation methods, and application fields of electromagnetic noise suppression sheets.

1、 The principle of electromagnetic noise suppression film

Electromagnetic noise suppression sheet is a material made based on the principle of electromagnetic wave absorption. When electromagnetic waves pass through materials, they are absorbed, reflected, and propagated. The absorption capacity of materials for electromagnetic waves depends on factors such as their conductivity, magnetic permeability, thickness, and shape. Electromagnetic noise suppression sheet materials are usually composed of conductive and magnetic materials, such as ferrite, metal, and carbon fiber, to enhance their electromagnetic wave absorption ability.

2、 Material of electromagnetic noise suppression sheet

Materials with excellent conductivity, magnetism, and absorption properties are usually selected for the preparation of electromagnetic noise suppression sheets. The commonly used materials are:

1. Ferrite

Ferrite is an oxide composite material with magnetic properties, characterized by high permeability, high saturation magnetization, good stability, and anti hysteresis. ferritesThe absorption performance is excellent in the high-frequency range.

2. Metal

Metal materials have good electrical and thermal conductivity, and can be made into mesh or conical structures to absorb electromagnetic waves. Commonly used metal materials include copper, aluminum, steel, tungsten, etc.

3. Carbon fiber

Carbon fiber is a new type of high-performance fiber developed in recent years, which has excellent conductivity, thermal stability, and mechanical properties. The material made of carbon fiber has excellent absorption performance.

3、 Preparation method of electromagnetic noise suppression film

The preparation method of electromagnetic noise suppression film varies according to different usage scenarios and target requirements. Common preparation methods include:

1. Mixed method preparation

Various materials such as ferrite, metal, carbon fiber, etc. are mixed in a certain proportion and added to resin to manufacture electromagnetic noise suppression sheets through a series of processes such as extrusion molding and heating curing.

2. Sol gel preparation

The original materials such as metal ions and iron ions are dissolved in water, and then initiator and complexing agent are added to prepare gel like materials. The electromagnetic noise suppressor is manufactured through heat treatment and high-temperature calcination.

3. Preparation by dispersant method

Various materials such as ferrite, metal, carbon fiber, etc. are mixed with appropriate dispersants and powders, and then manufactured into electromagnetic noise suppression sheets through spraying, deposition, and other methods.

4、 Application fields of electromagnetic noise suppression film

The application fields of electromagnetic noise suppression films are very wide. In the electronic fields of aerospace, military equipment, communication equipment, computers and peripheral devices, medical equipment, etc., electromagnetic noise suppression sheets are used to reduce the generation of electromagnetic radiation and improve the anti-interference ability of equipment.

In transportation equipment such as ships, automobiles, and railways, electromagnetic noise suppression sheets can be used to improve the lightning protection, isolation, and anti-interference performance of vehicles, while also eliminating interference from electronic devices on the vehicle's electrical system. In addition, electromagnetic noise suppression sheets can also be applied to the isolation and environmental protection of electromagnetic radiation in buildings.