电大开孔箱体内部场线耦合等效电路模型

基于混合算法提出了一种用于电大开孔箱体内部场-线耦合效应分析的等效电路模型.基于Cohn模型和镜像原理，计算电大开孔箱体内部任意观测点处电场解；推导了箱体内部电偶极矩辐射场的标量格林函数，并在其基础上建立了描述箱内场-线耦合的积分方程；采用矩量法对该积分方程求解，并基于所得线性方程组设计了箱内场-线耦合的等效电路模型；结合传输线终端边界条件，对终端响应电流进行计算.面波入射（φ=0，θ=0，φ=π/2）条件下，对5组实验的箱内传输线终端响应进行仿真分析，结果表明:等效电路模型精度与传输线细化指数η成反比，当η=0.375时，相关系数达到0.987 8；仿真0~3 GHz范围内1 001个频点的平均耗时比为1:9.2，从而验证了等效电路模型的高效性；等效电路模型与TLM数值算法计算结果的相关系数均值达到0.984 4，而绝对误差均值和标准差为12.445 dBA和16.438 dBA，从而验证了等效电路模型的准确性. 

Equivalent Circuit Model for Field-Line Coupling Inside a Rectangular Enclosure with Electrically Large Apertures

A novel equivalent circuit model for field-line coupling analysis inside an enclosure with electrically large apertures was proposed in this paper. Firstly, the electric field inside the enclosure was calculated based on Cohn model and mirror image principle. Secondly, a scalar quantity Green function was deduced for electric dipole radiation field inside an enclosure, an integral equation for field-line coupling was expanded in series, and then a matrix equation was obtained, based on which the equivalent circuit model was established. Finally, the boundary condition of the transmission line was considered to compute the terminal response current, and a simulation analysis was carried out for the response current of the transmission line inside a cavity illuminated by a plane wave (? =0,θ=0,φ=π/2). The results of 5 verification tests shows that:the precision of the equivalent circuit model is inversely proportional to transmission line exponent η, and when η=0.375, the correlation coefficient ρ=0.987 8. The ratio of the consuming time is 1:9.2 for 1 001 samples in a frequency range of 0~3 GHz, verifying the efficiency of equivalent circuit model. The correlation coefficient is up to 0.984 4, while the mean of absolute error and the standard deviation of this method compared to TLM are 12.445 dBA and 16.438 dBA, verifying the accuracy of equivalent circuit model.