The initial application areas of carbon fiber materials were limited to aerospace and other fields. With the continuous maturity and progress of carbon fiber technology, the application areas of carbon fiber are also expanding, and the products used in carbon fiber materials are also increasing.
A domestic military enterprise has developed a carbon fiber military transport box with electromagnetic shielding performance and a military communication radar cover with electromagnetic shielding. The main reason why carbon fiber has electromagnetic shielding ability is that it has good conductivity. After high-temperature graphitization treatment, carbon fiber can become an excellent reflective material for electromagnetic waves.
There are many classification methods for electromagnetic shielding materials, and carbon fiber belongs to the category of filled shielding materials. Filler type shielding composite materials are electromagnetic shielding material products composed of a matrix with good electrical insulation, conductive fillers with excellent conductivity, and other additives.
When the arrangement direction of carbon fibers is parallel to the incident electric field, as carbon fibers themselves are excellent conductive electrical loss materials, a large conductive current will be generated in the carbon fibers, which will generate strong reflection on the incident electric field and have a reflection effect similar to that of metals.
Another scenario is when the arrangement direction of carbon fibers is perpendicular to the incident electric field, and carbon fibers act as the loss medium for radar waves at this time; When the angle between the arrangement direction of carbon fibers and the incident electric field is uncertain, due to the fact that the reflected electric field is not parallel to the incident electric field, the reflected electric field will generate a component of the reflected electric field perpendicular to the incident electric field, thereby playing a certain role in wave attenuation.
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