用FDTD分析部分介质填充同轴传输线的截止频率

介绍用二维时域有限差分法(2D-FDTD)分析波导本征值问题的基本原理和计算过程,实例计算了T形分割矩形波导和同轴矩形波导的截止波数,并与文献值进行了比较,其结果与文献报道值吻合的较好,表明方法的有效性.计算了内十字形外矩形截面的方形同轴电缆线的高阶模式的截止频率,获得内十字形外矩形截面的方形同轴电缆线添加部分介质后的归一化截止频率谱图,并给出了其填充介质后各主模式的截止频率.

2D - FDTD Method Analysis of Cut - off Frequencies in Coaxial Transmission Line

This paper describes the main principle and the computational procedure for waveguide eigenvalues with 2D - FDTD. In order to demonstrate the availability of FDTD, the cut - off wavenumbers of T - septate rectangular waveguide and rectangular coaxial transmission line are calculated, and a comparison with the literature is given . The results agree well with that of the literature. It is shown that the 2D - FDTD is an effective approach for the calculating waveguide eigenvalues in the electromagnetic engineering. As an application, cut - off frequencies of higher order modes in transmission line consisting of Crisscross and rectangular conductors are computed, The dominant mode in dielectric - loaded transmission line consisting of crisscross and rectangular conductors and the resonant frequencies in dielectric - loaded transmission line consisting of crisscross and rectangular conductors are presented.