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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．
In this paper, a new fast algorithm is proposed for the first time by combining linear method with Fast Fourier Transform (FFT) and network decomposition technique. This method firstly transforms the Helmholtz equation with infinite periodic structure under any incident plane wave excitation, Dispersion of the new equation with a straight line method, the impedance element using FFT to calculate, combined with network decomposition techniques to find the current distribution. Comparison with ordinary straight-line method and spectral domain method shows that the proposed method has higher accuracy. Numerical examples show the scattering current of single-layer metal grid, which is in good agreement with the existing literature. Finally, the calculation results and test results of the power transfer coefficient of double-layer metal grid are given.