利用模式耦合理论，在理论推导出弯曲矩形波导TE01模和高阶模之间耦合系数显式表达的基础上，对弯曲矩形波导进行了实例研究。HFSS软件数值仿真结果表明：设计的矩形波导TE01-TE02模式转换器在9.5 GHz转换效率达到99.9%，转换效率大于90%的工作带宽为8.60～10.48 GHz；设计的弯曲矩形波导传输线，可有效传输TE01模，不激励起高阶模式。HFSS数值仿真结果验证了所设计的传输线工作带宽和功率容量均能够满足使用要求。

Coupling coefficients of TE01 rectangular waveguide mode to TE02, TE03 mode have been derived theoretically. Based on mode coupling theory, two kinds of transmission lines were reported. Firstly, a TE01 to TE02 mode converter at 9.5 GHz was designed. The conversion efficiency is 99.9% at center frequency. In the frequency range of 8.60～10.48 GHz, the conversion efficiency exceeds 90%. Secondly, dual- or tri-bend rectangular waveguide transmission line was designed to realize the transmission of TE01 mode, without stimulating higher order modes. The bandwidth and power capability can meet our requirements, which have been applied in high power microwave experiments.