随机取向圆柱体粒子的毫米波消光性能研究

摘要

针对采用Mie散射理论计算非球形粒子存在的缺陷，本文应用T-矩阵方法计算了不同等效球体积半径、不同复折射率、不同波长与不同长径比的随机取向圆柱体粒子的毫米波消光性能。结果表明，圆柱体粒子的消光效率因子峰值随着复折射率实部的增大而增大；随着复折射虚部的增大，圆柱体粒子的消光效率因子减小，吸收效率因子增大；随着毫米波波长的增大，圆柱体粒子的消光效率因子峰值大小不变，峰值的位置向着粒子较大的方向移动；圆柱体粒子长径比的变化主要影响其散射性能，对吸收性能影响很小。这些结论对改善圆柱体粒子的消光性能提供了解决方法，为毫米波干扰烟幕的设计提供了一定的理论基础。%Aiming at the shortcoming of adopting the Mie scattering theory to calculate non-spherical particles, the T-matrix method was used to calculate millimeter-wave extinction performance of randomly oriented cylinder particle under the conditions of different effective volume-equivalent-sphere radius, complex refractive index, and wave-length and aspect ratio. The results show that the extinction efficiency factor peak of cylinder particle enhances with the increasing of the real part of complex refractive index. With the increasing of the virtual part of complex refractive index, the extinction efficiency factor peak of cylinder particle becomes smaller, and its absorption efficiency factor rises. With the increasing of millimeter-wave wavelength, the extinction efficiency factor peak of cylinder particle remains unchanged, and the positions of peak value moves toward larger particles. The change of aspect ratio mainly influences the scattering performance, but has little impact on absorption performance. The conclusions are obtained which can provide solutions for cylinder particle to improve its extinction performance and lay the theoretical foundation to design millimeter-wave interference smokescreen.