一种新型慢波结构TM01-TE11模式转换器的数值模拟

 设计了一种新型L波段慢波结构式圆波导TM₀₁-TE₁₁模式转换器，该转换器的尺寸为φ15.0 cm×40.8 cm，通过金属分割片将圆波导分成两个180°区域并在其中一个区域内设置半环形慢波结构。当TM01入射时，在两个区域内激励起扇形波导TE11模式，由于慢波结构的存在，该模式在两个区域内的传播常数不一样。适当调节慢波结构的参数，可使两个区域内传输的扇形TE11模式在金属分割片尾部相位相差180°，这两个扇形TE11模式耦合成为圆波导TE11模式输出，实现模式转换。建立数值模型并进行了模拟，结果表明在工作频率1.8 GHz处转换效率96%，反射率低于0.04，功率容量超过1.7 GW。

Numerical simulation of novel TM01-TE11 mode converter with slow-wave structures

A novel mode converter with slow-wave structures is investigated. The circular waveguide is separated into two regions by a metal plate. One is a regular 180° sector waveguide, the other is inserted with slow-wave structures. The input circular TM01 mode excites two sector TE11 modes which propagate at different phase velocities in the two regions. Adjusting the parameters of the SWSs, the two sector TE11 modes have various phase difference. At the end of the plate the two sector TE11 modes with 180° phase difference couple into the circular TE11 mode to finish the TM01-TE11 mode conversion. The input and output is aligned on the same axis, which is helpful for the compactness of the microwave lunching systems. Numerical simulations reveal that at the operating frequency of 1.8 GHz the c