【摘要】 应用有限积分技术,构造出一种快速求解波导特征模瞬态响应的时域有限差分格式。应用该方法计算的结果与通常三维的时域有限差分方法计算的结果十分吻合,但该方法具有很高的计算效率。在新的差分格式下,通过人工添加损耗项,构造出一种新的损耗传输线模型;该方法改善了截断边界条件对虚假反射回波的吸收性能,使虚假的反射回波低于-60dB。更多还原

【Abstract】 By means of the finite integration technique (FIT), a new finite difference formula in time domain is constructed for fast simulating the transient response of the characteristic modes of waveguide. Compared with conventional finite difference time domain (FDTD) in three dimension, the computed results are in agreement with ones of the conventional FDTD′s, and it illustrates much more efficiency. Based on the new difference formula, a new kind of loss transmission line model is derived by adding artificially some loss terms, and the magnitude of the fictitious returning wave from the truncating boundary conditions can be reduced to -60dB below.更多还原