Research on the Improvement of Absorption Efficiency of Graphite Absorbing Materials in High Frequency Band

abstract

AbsorberAbsorbing Materials (AMs) are a type of material used to absorb electromagnetic wave energy and convert it into thermal energy. They are widely used in fields such as radar stealth technology and electromagnetic interference (EMI) suppression. With the development of wireless communication technology, higher requirements have been put forward for the absorption capacity of high-frequency electromagnetic waves. This article conducts research throughGraphite based absorbing materialExplore the absorption performance in the high frequency band (GHz level) and explore how to improve the absorption efficiency by adjusting the material structure and composition.

The design goal of absorbing materials is to minimize reflection within a specific frequency range and achieve effective absorption of electromagnetic waves. Graphite, as a carbonaceous material with good conductivity and thermal conductivity, has potential application value in the field of absorbing waves. However, traditional graphite materials have limited absorption efficiency in the high frequency range and need to be improved to meet the needs of modern communication systems.

Experimental Materials and Methods

The graphite absorbing material sample used in this study is composed ofAdvanced Institute (Shenzhen) Technology Co., LtdProvide. The sample uses graphite powder as the base material, and different formulations of composite materials are prepared by doping other functional additives such as ferrite powder, carbon nanotubes, etc. All samples were pressed into sheets of the same thickness and subjected to absorption performance testing in a microwave anechoic chamber.

Analysis of Factors Affecting Absorption Efficiency

The influence of doping components on the absorption performance

Experiments have found that adding an appropriate amount of ferrite powder (Fe3O4) to graphite powder can enhance the material's magnetic loss ability to a certain extent, thereby improving its absorption effect in the high-frequency range. When the Fe3O4 content reaches 10%, the reflection loss of the sample at 9GHz reaches -25dB, which is about 10dB higher than that of pure graphite samples.

The Influence of Material Structure on Absorption Performance

In addition, the introduction of carbon nanotubes (CNTs) not only increases the dielectric loss of the material, but also improves the interconnectivity of the graphite network, reducing the reflection loss of the composite material to around -30dB at 10GHz, which is about 15dB higher than pure graphite materials.

data comparison

By adjustingGraphite absorbing materialThe formula shows a significant improvement in its absorption performance. Specifically, when the content of Fe3O4 and CNTs is 10% and 5%, respectively, the reflection loss value of the sample reaches the optimal level in the high-frequency range (9-10GHz). This result indicates that increasing the proportion of magnetic materials and conductive fibers appropriately can effectively improve the absorption efficiency of graphite based absorbing materials.

discuss

This study indicates that by designing the composition and structure of graphite absorbing materials reasonably, their absorption efficiency can be significantly improved in the high frequency range. Future research directions may include further optimizing material ratios, exploring new functional additives, and developing absorbing materials suitable for a wider frequency range.

conclusion

The absorption efficiency of graphite absorbing materials in the high frequency range can be improved by adjusting the material composition and structure. The addition of ferrite powder and carbon nanotubes helps to enhance the magnetic and dielectric loss capabilities of the material, thereby improving its absorption performance. These findings provide theoretical support and technical guidance for the development of efficient absorbing materials suitable for high-frequency communication systems.