摘要
提出一种具有带通频谱特性的激励源，在波导不连性问题的时域有限差分法计算中，具有激励效率高，可滤除主模式截止频率以下的频率分量，使波导系统工作在单模工作频带，从而避免了截止频率分量引入的不稳定影响，实际计算表明与常规高斯脉冲激励相比，可大大节省计算时间及相应的计算机内存要求。
A new source which has a rectangular spectrum is proposed for the FDTD analysis of waveguide discontinuity.The source has high excitation efficiency and can filter out all undesired frequency components which are under the cutoff frequency of the dominant mode and makes the calculation operating on a single dominant mode condition.Compared with the convention Gaussian pulse excitation,a practical calculation shows that both the CPU time and the memory requirement is greatly saved.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
1998年第1期43-46,共4页
Journal of University of Electronic Science and Technology of China
基金
国家自然科学基金
关键词
时域有限差分法
带通激励源
波导
finite difference time domain, bandpass excitation source, Fourier kernel function, cutoff modes
