By making use of the background of theory, three models are established, include: normal transmission lines, ribbon cable, printed circuit board(PCB) trace, which generally, externally describe actual circumstances.

• 在这些理论基础上,建立了三种多导体传输线的数学模型,包括:常规传输线模型,扁平电缆模型,印刷电路板中导体带模型。