摘要
本文将＂两外空间＂概念与普通Ｔ矩阵公式相结合，提出了修正Ｔ矩阵公式。作为应用实例，本文用修正Ｔ矩阵理论研究了半空间随机球粒媒质的电磁波多散射，在Ｆｏｌｄｙ近似下得到了确定媒质有效波数的一个超越方程。低频时的数值结果表明：修正Ｔ矩阵方法当颗粒稀疏分布时是可行的，当颗粒致密分布时，尚需采用引入颗粒对分布函数的准晶近似。
By combining the concept of 'two-exterior spaces'with the common T-matrix formulation, the modified T-matrix formulation of a scatterer is derived. As an example of application, the problem of multiple scattering of EM waves by a half-space of randomly distributed dielectric spheres is analyzed by using the modified T-matrix formulas of a sphere. A transcendental equation for determining the effective wavenumber of the random medium is obtained under Foldy's approximation. The numerical results in the low-frequency limit show that the modified Tmatrix approach with Foldy's approximation is only applicable for the sparse distribution of the scatterers. As the distribution of the scatterers is dense,the quasicrystalline approximation together with the pair distribution function of the scatterers has to be used.
出处
《电子学报》
EI
CAS
CSCD
北大核心
1994年第12期81-84,共4页
Acta Electronica Sinica
基金
国家自然科学基金
关键词
媒质
电磁波多散射
电磁场
分析
Modified T-matrix
Randomly Distributed Scatterers
Multiple Scattering
