电大尺寸线面结构辐射特性的自适应积分方法准确分析

在应用自适应积分方法分析导体线面连接结构的电磁辐射时，提出了Costa基函数的面上部分可以独立选取，不需要与面上RWG三角形域完全重合．由于连接域三角形数量多，按照传统的方法把它作为一个整体得到的投影值是不准确的．为了克服这个缺陷，可以选取连接域三角形的一部分作为连接域基函数的面上部分．因此，Costa基函数域将大部分落在相应的投影盒内，这样得到的投影值比较精确．算例表明连接域的近区阻抗元素的精度可以提高40％左右，该方法能准确高效地分析任意线面连接问题．

Accurate analysis of electrically large wire-to-surface configurations by the adaptive integral method

The idea of choosing the surface part of the Costa basis function independently of the RWG region is presented while solving electromagnetic radiation problems of surface-wire configurations using the adaptive integral method(AIM). Because unsually many triangles are involved in junctions, the equivalent sources are inaccurate if projecting all of them to the uniform grids as the traditional AIM. To overcome this shortcoming, only a part of each triangle basis function on the surface is selected, based on the fact that the normal component of the current on the edges of each triangle will vanish. Therefore, the resulting equivalent sources can be more accurate in the corresponding grid box. Numerical results demonstrate that the technique could effectively improve the accuracy of near-zone matrix elements by about 40％. The method can be used to analyze arbitrary surface-wire configurations with a high accuracy and efficiency.