雷达波段内磁性吸波颗粒光散射特性分析

针对目前在微波雷达隐身技术中广泛运用的吸波材料颗粒,根据米氏(Mie)散射理论对磁性吸波颗粒在雷达波段内的光散射特性进行了数值模拟和计算分析.在Mie系数中引入磁导率变量,分别计算了磁导率、折射率及颗粒粒径等参数对吸波颗粒光散射特性的影响;同时对比分析了磁性与非磁性吸波颗粒的散射光强、散射系数、吸收系数等散射特性规律.数值计算结果表明,颗粒磁特性的变化对其散射性能造成影响,磁导率的增大将使颗粒的吸收性能增强而后向散射强度减弱,有利于吸波颗粒雷达散射截面的减小,同时磁导率变化对颗粒散射特性的影响受到复折射率的制约.

Analysis of Scattering Properties for Magnetic Absorbing Particles at the Radar Wave Band

This paper analyzes the light-scattering properties of the widely-used nanometer or micrometer absorbing magnetic particles at radar wave band based on Mie scattering theory. the effects of the permeability, refractive index and particle sizes on the scattering characteristics are analyzed. The scattering characteristics including scattering intensity, absorption coefficient, scattering coefficient and etc. by magnetic and non-magnetic particles are also compared analytically as well as those by absorbent and transparent particles. Numerical results indicate that the permeability variation has influences on the scattering characteristics such as scattering intensity and absorption property. It is found that the absorption ability increases and back scattering characteristic decreases towards high permeability while its effect on the particles scattering characteristics is restricted simultaneously by the complex refractive index.