MLC-FDTD在波导带通滤波器设计中的应用

MLC-FDTD for the design of rectangular waveguide band-pass filter

应用改进的局部共形网格FDTD技术(MLC-FDTD)分析了矩形波导带通滤波器.MLC-FDTD解决了局部共形网格技术的不稳定性因素,部分修改电场的更新迭代方程,以提高计算精度.在同样网格数的情况下,采用共形网格技术的计算结果比传统FDTD的结果具有更高的精度,说明在分析具有圆形或者环形边界的电磁结构时,采用局部共形网格技术能够得到更好的结果.

A modified locally conformal Finite- Difference Time -Domain method （MLC -FDTD） was applied in this paper. MLC -FDTD removed the instability of the original locally conformal FDTD algorithm, and improved the computational accuracy by partly modifying E -filed update equations. The calculated results using MLC - FDTD were compared with ones using traditional FDTD, showed good agreement. MLC - FDTD used could get more accurate, when analyzing circular or annular boundary.