【摘要】 在三维复扩展柱坐标系下推导了麦克斯韦方程在完全匹配层吸收边界条件中的时域有限差分(PML-FDTD)表达式,将FDTD推广到三维扩展柱坐标系中;为保证其求解的稳定性,给出了更为严格的时间步长计算公式,并去除了对称轴上的奇点;提出了利用插值法对PML最外层理想金属层进行设置的方法,改善了PML的吸收性能.更多还原

【Abstract】 The finite-difference time-domain formula of Maxwell’s equation is first deduced in a perfectly matched layer(PML) in 3-D cylindrical complex coordinates.In order to ensure stability,a strict time-step formula is given and the singularities on axis are removed.Then,a new interpolate method is proposed instead of the metal outer of the PML.The absorbing capability of PML is improved.更多还原