多相混合物有效介电常数的DDA算法  

DDA Arithmetic for Effective Permittivity of Multi-phase Mixture

作　　者：肖岗[1] 杨青 冯恩信[1] 

机构地区：[1]西安交通大学电子与信息工程学院,西安710049 [2]广东普信科技有限公司,广州510630

出　　处：《微波学报》2008年第6期8-11,共4页Journal of Microwaves

摘　　要：利用离散偶极子近似(DDA)给出了一种计算由球形粒子和非球形粒子组成的多相(大于三相)混合物有效介电常数的方法。考虑到粒子之间多次散射作用,给出了多种混合物的有效介电常数,并与存在的Maxwell-Garnett方法做了比较,结果表明,在粒子占空比较低时,该方法和MG理论以及试验结果吻合很好,MG理论并不适合于高占空比的情况,特别是多相混合物。This paper adopts the DDA to calculate the effective permittivity of a muhi-phase mixture composed of spherical particles and non-spherical particles. The multiple scattering between the scatterers is being taking into account, we give effective permittivity of several multi-phase mixtures, and compare them to that obtained from MG. The results show that this method accords with the MG theory and experiment result in the cases of low fractional volume, and the MG formula is not suitable for the cases of high fractional volume, especially for the multi-phase mixture.

关 键 词：离散偶极子近似 多相混合物 有效介电常数 

分 类 号：O482.4[理学—固体物理]