Electromagnetic Wave Absorbent Material

Electromagnetic wave absorbent material refers to a type of material that can absorb or greatly reduce the electromagnetic wave energy received on its surface, thereby reducing the interference of electromagnetic waves. In engineering applications, in addition to requiring high absorption of electromagnetic waves in a wide frequency band, the absorbing material is also required to have light weight, temperature resistance, humidity resistance, and corrosion resistance.

With the development of modern science and technology, the impact of electromagnetic radiation on the environment is increasing. At the airport, the flight cannot take off due to electromagnetic wave interference, and it is delayed; at the hospital, mobile phones often interfere with the normal operation of various electronic diagnosis and treatment equipment. Therefore, the treatment of electromagnetic pollution and the search for a material that can withstand and weaken electromagnetic wave radiation-absorbing materials have become a major issue in materials science.

Electromagnetic radiation causes direct and indirect damage to the human body through thermal, non-thermal, and cumulative effects. Studies have confirmed that ferrite absorbing materials have the best performance, which has the characteristics of high absorption frequency band, high absorption rate, and thin matching thickness. Applying this material to electronic equipment can absorb leaked electromagnetic radiation and achieve the purpose of eliminating electromagnetic interference. According to the law of electromagnetic waves propagating in the medium from low magnetic to high magnetic permeability, high magnetic permeability ferrite is used to guide electromagnetic waves, through resonance, a large amount of radiant energy of electromagnetic waves is absorbed, and then the energy of electromagnetic waves is converted into heat energy through coupling.

In the design of the absorbing material, two issues should be considered: 1) When the electromagnetic wave encounters the surface of the absorbing material, pass through the surface as much as possible to reduce reflection; 2) When the electromagnetic wave enters the interior of the absorbing material, make the electromagnetic wave Lose the energy as much as possible.

Below are the available Electromagnetic wave absorbing material raw material in our company:

1). carbon-based absorbing materials, such as: graphene, graphite,  carbon nanotubes;

2). iron-based absorbing materials, such as: ferrite, magnetic iron nanomaterials;

3). ceramic absorbing materials, such as: silicon carbide.

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