研究了一种有限积分法软件与传输线方程相结合的混合算法,用于解决复杂电磁环境下屏蔽腔体内传输线的电磁耦合问题。利用有限积分法软件实现屏蔽腔体的建模,仿真得到腔体内部空间电磁场分布,并设置电场探针提取出传输线的激励场。利用传输线方程建立腔体内传输线的耦合模型,将得到的传输线激励场引入到传输线方程作为等效分布电压和电流源。利用时域有限差分(FDTD)格式对传输线方程进行离散,从而迭代求解出传输线终端负载上的电压和电流响应。通过与文献以及传统数值算法的计算结果进行对比,验证混合算法的正确性。研究表明,该混合算法在模拟电大尺寸腔体内传输线的电磁耦合方面,具有较高的精度和计算效率。

This paper studies a novel hybrid method based on Finite Integral method software and transmission line (TL) equations for solving coupling problems of transmission lines in cavity in complicated electromagnetic environment. The software is convenient to build the model of arbitrary cavity without transmission lines and obtain electromagnetic field distribution in the cavity. Electric field probes are used in the software to exact the excited fields of transmission lines. TL equations are used to set up the coupling model of transmission lines in cavity. Then the excited fields are introduced into the TL equations as additional sources. The TL equations discretized by the difference scheme of finite difference time domain (FDTD) method are utilized to compute the current and voltage responses at terminal loads of transmission lines. The correctness of the hybrid method is confirmed by comparing with the results from references and obtained by the traditional method. In testing, the hybrid method in the simulation of coupling of transmission lines in electrically large and complex cavity has high precision and computational efficiency.