【摘要】 利用时域有限差分法 (FDTD)研究了同轴电缆传输数字脉冲信号时的孔缝辐射效应。文中首先推导了三维柱坐标系下完全匹配层 (PML)的差分表达式 ,并给出保证其解稳定性的更为严格的时间步长公式。然后利用FDTD法分析了数字信号经同轴电缆孔缝的辐射效应 ,对孔缝内外的电磁场及其远场进行了数值分析和计算。处理孔缝边界时 ,用级数展开和积分方程得到金属拐角处电磁场的近似解。最后对结果进行了分析更多还原

【Abstract】 In this paper, the radiation from the aperture on coaxial cable used as digital signals transmition is investigated using FDTD method. Firstly, The perfectly matched layer (PML) in three dimension stretched cylindrical coordinates is deduced, and a strict formula of time step is presented so as to ensure the stability of the numerical solution. Secondly, the field strength inside and outside the aperture, and the far field are calculated. For dealing with the electromagnetic fields near edges, an approximate scheme is developed using the series expansions and integral equations. At last, a few main conclusions are given.更多还原