According to Baidu Encyclopedia: Absorbing material refers to a type of material that can absorb the electromagnetic wave energy projected on its surface. 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 is delayed due to electromagnetic interference; mobile phones often interfere with the normal operation of various electronic medical equipment.
1) High absorption frequency band, high absorption rate, thin matching thickness
Electromagnetic radiation causes direct and indirect damage to the human body through thermal, non-thermal, and cumulative effects. 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.
2) Stealth and electromagnetic compatibility (EMC)
The role and status of electromagnetic wave absorbing materials are very prominent, and they have become a magic weapon and "secret weapon" for electronic countermeasures in modern military.