Foam core structure absorbing material: lightweight but powerful absorbing ability

With the rapid development of communication technology, the interference caused by electromagnetic radiation on human health and device functions has attracted increasing attention. In the process of solving this problem,Foam core structure absorbing materialcut a striking figure. This paper will discuss the characteristics of foam core structure absorbing materials and their applications in effective absorption of electromagnetic waves.
1. Advantages brought by light foam filling material
The lightweight and low-density foam layer is often used as the filling material of foam core structure absorbing materials. This structure not only has the characteristic of light weight, but also can increase the effective absorption bandwidth of the material. In addition, the foam layer also plays a role in regulating the surface impedance of the material, which greatly improves the wave absorption performance of the material. By cooperating with other sandwich structures, the foam core structure absorbing material not only reduces the overall mass of the material, but also improves the absorbing performance.
2. Breakthroughs in Advanced Institute Technology
Glass fiber reinforced polymer (GFRP), foam layer and nickel plated glass fiber layer (NCF)Sandwich structure absorbing composite materialShowed amazing absorption performance. In the range of 6.5-17.5 GHz, the effective absorption of this material is less than -10 dB, and the maximum reflection loss is about -24 dB. This further verifies that the addition of foam layer not only reduces the mass of the material, but also widens the effective absorption bandwidth of the material, thus enhancing the wave absorption performance.
3. Application of MWCNT in Epoxy Resin/Glass Fiber Composite Materials
In the design process of foam core structure absorbing material, MWCNT added epoxy resin/glass fiber composite material is often used as panel and bottom plate, while low-density/lightweight foam is used as sandwich. After designing the target for the C~X band, this structure can achieve effective absorption throughout the entire band, with a maximum reflection loss of -16.4 dB for the C band and -25 dB for the X band. Meanwhile, this structure is also applicable to the X~Ku band, achieving effective absorption throughout the entire band, with a maximum reflection loss of -25.7 dB in the Ku band.
4. Combination of epoxy resin, PVC foam and frequency selective surface
Another kind of foam core structure absorbing material is glass fiber and carbon fiber reinforced epoxy resin, combined with PVC foam and frequency selective surface as sandwich structure. The research results indicate that the structure achieves 14 GHz within a bandwidth range of less than -15 dB, and the maximum reflection loss is approximately -30 dB. This further confirmed the high efficiency of foam core structure absorbing materials.
Conclusion:
        Foam core structure absorbing materialWith its lightweight yet powerful absorbing ability, it has shown great potential in the field of electromagnetic wave protection. By using sandwich structure of different materials, foam core structure absorbing materials can achieve effective absorption in all frequency bands. It is believed that with the continuous development of technology, foam core structure absorbing materials will play a greater role in the field of electromagnetic radiation protection and create a safer and interference free communication environment for people.