一种新的等效电磁流边缘分量表达式  

New Expressions for Fringe Current Components of Equivalent Edge Currents

作　　者：赵维江[1] 龚书喜[1] 刘其中[1] 

机构地区：[1]西安电子科技大学天线研究所,陕西西安710071

出　　处：《电子学报》2002年第9期1340-1343,共4页Acta Electronica Sinica

基　　金：国家部委预研基金(No.99J10.l.lDZ0l39)

摘　　要：增量长度绕射系数是目前用于计算边缘绕射场的一种方法,但对给定的人射波方向,在某此观察方向上,该方法会呈现出某些奇性。为消除上述奇异性,Micharli推出了等效电磁流边缘分量的另外一种表达式,该表达式除存在Ufimtsev奇点外在所有观察方向上均不发生奇异.然而Michaeli的表达式不是增量长度绕射系数的推广,在增量长度绕射系数不奇异的情况下,两者的计算结果可能会有较大的差别本文提出了一种新的等效电磁流边缘分量表达式.与Michaeli的同类表达式相比,新表达式既能有效克服增量长度绕射系数（ILDC）方法中的某些奇异性困难,又能与ILDC保持很好的一致性。Incremental length diffraction coefficients (ILDC) is often used to calculate the diffraction by edges.However,ILDC displays infinities for certain combinations of observation and incidence directions. To eliminate such infinities, Michaeli derived a set of expressions for the fringe current components of equivalent edge currents, those expressions are finite for all aspects of illumination and observation,except for the Ufimtsev singularity. However,for certain non-singular aspects of ILDC, maybe there is a wide divergence between these two methods results. In this paper, new exppressions for fringe current components of equivalent edge currents are presented. Compared with those given by Michaeli, new expressions can not only eliminate the infinities in LDC effectively, but also keep good agreement with ILDC. So it is very valuable in practical applications.

关 键 词：边缘分量 电磁散射 等效电磁流方法 增量长度绕射系统 ILDC MEC 

分 类 号：TN011[电子电信—物理电子学]