摘要
本文将直线法与快速付里叶变换（ＦＦＴ）和网络分解技术相结合，首次提出了一种新的快速算法，这一方法首先对任意入射角平面波激励下无限周期结构的Ｈｅｌｍｈｏｌｔｚ方程进行变换，用直线法离散新方程，其阻抗元素利用ＦＦＴ进行计算，再结合网络分解技术求出电流分布．与普通直线法和谱域法的比较表明：本算法精度较高．数值算例给出了单层金属栅的散射电流，与已有文献结果吻合很好，最后给出了双层金属栅的功率传输系数的计算结果和测试结果．
A new fast algorithm is presented by combining method of lines(MoL) with FFT and diakoptic technique. In order to calculate the impedance elements by FFT,the Helmholtz equation of infinite period with oblique incidence is transformed to a new one. Then the current on the metal strip is calculated by using diakoptic technique. Compared with conventional MoL ,the new algorithm presented in this paper is more powerful. Numerical results computed are in good agreement with those published. Finally,the measured and calculated results of double gratings are presented.
出处
《电子学报》
EI
CAS
CSCD
北大核心
1996年第6期1-4,共4页
Acta Electronica Sinica
关键词
快速算法
直线法
FFT
网络分解技术
周期结构
Fast algorithm
Method of lines
Fast Fourier transform
Diakoptic technique
Periodic structures
