【摘要】 给出直角坐标系下用时域有限差分(FDTD)方法计算电磁场问题的差分格式,详细介绍了用FDTD法分析不规则传输线高阶模截止频率的计算过程。实例计算了矩形波导的截止频率,并与解析解进行比较;计算了几种复杂边界传输线的高阶模截止频率随内导体变化的情况,给出传输线TE1模的模场分布。该方法也可推广应用于各种复杂截面波导、复杂截面传输线传输特性的分析和计算。更多还原

【Abstract】 This paper presents the method of computation for non-regular transmission line by using finite-difference time-domain(FDTD) method.In order to demonstrate the availability of the method,the cutoff frequency of empty rectangular waveguide was calculated and a comparison was given.As an application,representative computational examples,including L-and T-shape transmission line,are given to validate the theory.更多还原