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提出了求解复杂飞行器目标谐振区散射场的回路线栅法．回路线栅法的基本思想是以其上流动着感应电流的三维线栅回路网格来模拟在入射波激励下的连续金属表面，与以往单独分段的线栅模型不同，本文利用构成闭合回路的线栅构造每一个金属面元，而不采用单独分段线栅电流表示面元的被激电流，从而使得基尔霍夫定律在每个节点处能够得到自动满足．通过分析目标几何特性建立相应的回路线栅电磁模型，并利用共轭梯度快速傅利叶变换法（ＣＧＦＦＴ），给出谐振区复杂飞行器目标的雷达散射截面（ＲＣＳ）结果．
A loop-line grid method is proposed to solve the scattering field in the target resonance region of a complex aircraft. The basic idea of loop-wire grid method is to simulate the continuous metal surface excited by the incident wave with the three-dimensional wire grid loop with inductive current flowing on it. Different from the previous separate wire grid model, Instead of using a separate piece-wise grid current to represent the currents of the surface elements, each Kirchhoff’s law can be automatically satisfied at each node. By analyzing the geometric characteristics of the target, a corresponding electromagnetic model of the return wire grid was established and the RCS results of the complex aircraft targets in the resonance region were obtained by using the conjugate gradient-fast Fourier transform method (CG-FFT).