基于耦合模假设，研究了描述两太赫兹金属线波导之间耦合特性的耦合模理论.通过采用与光波导耦合模理论等价的近似，研究得到了耦合方程和耦合系数表达式.进而，研究得到了两个相同金属线波导的耦合方程解及耦合特性.所提出的理论对于描述两金属线波导之间的能量传递具有重要的意义.

A coupled-mode theory for treating the coupling of two terahertz (THz) wire waveguides was studied using the coupled-mode assumption.Both coupling equations and coupling coefficients were obtained by using approximations equivalent with those in coupled-mode theory of optical waveguides.Furthermore,the solutions and coupling characteristics of coupled-mode equations for two same wire waveguides were obtained.The present theory is useful for treating problems involving energy exchange between the wire waveguides.