关键词: 自适应积分方法, 快速傅里叶变换, 线面连接, 电磁辐射

Abstract:

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.

Key words: adaptive integral method (AIM), fast Fourier transforms (FFT), wire-to-surface junction, electromagnetic radiation