膨胀石墨3mm波消光数值计算

Numerical calculation of 3 mm wave extinction for expanded graphite

为探讨膨胀石墨作为3mm波干扰材料的消光、散射特性及其影响因素,基于有限长度、有限电导率圆柱状导体的电磁散射,利用矩量法建立了膨胀石墨的消光、散射、吸收及后向散射截面(雷达散射截面RCS)的计算式.运用Mathematica编程计算并分析了膨胀石墨长度、半径、电导率、磁导率等因素与膨胀石墨消光、散射、吸收截面及RCS的关系.结果表明:当膨胀石墨的长度为1.5mm、半径为0.05mm时,具有较好的消光、散射效果;适当增大膨胀石墨的电导率、磁导率,有利于提高其消光、散射能力.本研究为探索增强膨胀石墨干扰3mm波效果的技术途径提供了有价值的参考.

In order to explore the extinction and scattering characteristics of expanded graphite, which is a kind of 3 millimeter wave interference materials, the formula of extinction, scattering, absorption and backscattering cross sections （radar cross. section, RCS） are established based on the electromagnetic scattering theory of cylindrical conductor of finite length and finite conductivity by the method of moment. The extinction and scattering characteristics are calculated, and the influening factors of the characteristics including length, radius, conductivity and magnetic permeability of the expanded graphite are analyzed using Mathematica program. Results show that the expanded graphite has excellent extinction and scattering properties when its length and radius are 1.5 mm and 0.5 mm, respectively, and the properties can be improved when the conductivity and magnetic permeability of the expanded graphite are increased properly. This research provides a valuable insight into the improvement of interference performance of expanded graphite in 3 millimeter wave.