将时域有限差分(FDTD)法和外场激励下屏蔽电缆的传输线模型相结合,研究计算了外场激励下带缝金属腔内屏蔽电缆的终端负载响应。首先利用FDTD计算了腔内屏蔽电缆处的激励场,然后由得到的激励场和外场激励下屏蔽电缆的传输线模型计算得到屏蔽电缆的终端响应。研究表明,屏蔽电缆对外场干扰具有良好的屏蔽性能。该方法需要的内存和计算量较小,并且使用简单方便。

This paper studies the termination responses of a shielded cable within a cavity with slot under external electromagnetic field,using a mixed method combining the finite difference time domain(FDTD)method with the transmission line model of the shielded cable. The excitation fields of the cable are computed firstly with the FDTD method,and then the responses of the terminations are computed using the transmission line model. The mixed method requires small memory and computation quantity with ease of use. The study shows that the shield of the cable has good shielding capabilities for external electromagnetic interference.