Research and Application of Broadband Electromagnetic Wave Absorbing Coatings and Electromagnetic Compatibility Materials

Broadband electromagnetic wave absorbing coatings and electromagnetic compatibility materials are important research directions in the field of materials science. They have broad application prospects in information security, electromagnetic compatibility, stealth technology, radar, base stations, security protection, microwave anechoic chambers, and other fields.

Broadband electromagnetic wave absorbing coating is a type of coating with characteristics such as broadband absorption, high absorption rate, thin coating, and good environmental temperature stability. They are mainly composed of absorbents, adhesives, and solvents, and are coated on the target surface to form a layer that can absorb electromagnetic waves. The type and properties of absorbents have a decisive impact on the absorption performance of coatings, and common absorbents include ferrite, metal ultrafine magnetic absorbents, etc.

Electromagnetic compatibility materials are a type of material that can reduce electromagnetic interference and improve electromagnetic compatibility. They are widely used in electronic devices, communication equipment, computers and other fields, aiming to reduce the impact of electromagnetic waves on the surrounding environment and human body, while ensuring the normal operation of the equipment. The main types of electromagnetic compatibility materials include conductive materials, magnetic materialsAbsorberWait.

According to the molding process and load-bearing capacity, absorbing materials can be divided into coating type and structural type. Coated absorbing materials have the advantages of simple process, convenient use, and easy adjustment, and have therefore been widely used in fields such as stealth weapons. Structural absorbing materials have dual functions of load-bearing and absorbing, and their structural forms include honeycomb, pyramid, and corrugated.

According to the absorption principle, absorbing materials can be divided into absorption type and interference type. Absorption type absorbing materials themselves absorb and lose radar waves. The basic types include absorbers with complex magnetic permeability and complex dielectric constant that are basically equal, impedance gradient "wideband" absorbers, and thin layer absorbers that attenuate surface currents. Interference type absorbing materials utilize the equal amplitude and opposite phase of the reflected waves from the surface and bottom layers of the absorbing layer for interference cancellation, such as a 1/4 wavelength "resonant" absorber. The disadvantage of this type of material is that it has a narrow absorption band.

According to the research period, absorbing materials can be divided into traditional absorbing materials and new absorbing materials. Traditional absorbing materials mainly include ferrite, barium titanate, metal micro powder, graphite, silicon carbide, conductive fibers, etc. They usually have disadvantages such as narrow absorption band and high density. The new type of absorbing material has the advantages of wide absorption bandwidth, high absorption rate, low density, and high temperature resistance, and has therefore been widely used in stealth technology, radar, base stations, and other fields.

Overall, broadbandElectromagnetic wave absorbing coatingThe research and application of electromagnetic compatibility materials are of great significance for improving information security, electromagnetic compatibility, and reducing electromagnetic interference. With the continuous advancement of technology and the increasing demand for applications, these materials will be studied and applied more widely.