In this article, a broadband $W$ -band $\mathrm{TE}^{\square }_{10}$ – $\mathrm{TE}^{\bigcirc }_{02}$ mode converter is proposed and verified. To improve the output performance of the $\mathrm{TE}^{\square }_{10}$ – $\mathrm{TE}^{\bigcirc }_{02}$ mode converter, a $\mathrm{TE}^{\square }_{10}$ -to- $\mathrm{TE}^{\square }_{40}$ intermediate mode conversion section with a Y-type power divider structure and a $\mathrm{TE}^{\times }_{44}$ -like-to- $\mathrm{TE}^{\bigcirc }_{02}$ intermediate mode conversion section with a novel cross-sector-shaped transition structure are adopted in the design (the superscript symbol $^{\square }$ represents the rectangular waveguide, $^{\bigcirc }$ represents the circular waveguide, $^{\times }$ represents the cross waveguide). The simulation results show that the transmission coefficient (S ₂₁ parameter) of the designed $\mathrm{TE}^{\bigcirc }_{02}$ mode converter is better than −0.18 dB in the whole $W$ -band (75–110 GHz), and the corresponding mode conversion efficiency is larger than 96%. Cold test results show that the transmission coefficient is higher than −1.9 dB and the reflection coefficient (S ₁₁ parameter) is less than −15 dB in the frequency range of 75–110 GHz.

中文翻译：

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一种 宽- 带矩形波导 TE ₁₀到圆形波导 TE ₀₂模式转换器

在本文中，宽带 $W$ -乐队 $\mathrm{TE}^{\square }_{10}$ —— $\mathrm{TE}^{\bigcirc }_{02}$ 提出并验证了模式转换器。为了提高输出性能 $\mathrm{TE}^{\square }_{10}$ —— $\mathrm{TE}^{\bigcirc }_{02}$ 模式转换器，一个 $\mathrm{TE}^{\square }_{10}$ -至- $\mathrm{TE}^{\square }_{40}$ Y型功分器结构的中间模式转换部分和 $\mathrm{TE}^{\times }_{44}$ -喜欢- $\mathrm{TE}^{\bigcirc }_{02}$ 设计中采用了具有新型横截面形过渡结构的中间模式转换段（上标符号 $^{\square }$ 表示矩形波导， $^{\bigcirc }$ 代表圆形波导， $^{\times }$ 代表交叉波导）。仿真结果表明，设计的透射系数（S ₂₁参数） $\mathrm{TE}^{\bigcirc }_{02}$ 模式转换器整体优于−0.18 dB $W$ -band (75–110 GHz)，对应的模式转换效率大于 96%。冷测试结果表明，在75-110 GHz的频率范围内，传输系数高于-1.9 dB，反射系数（S ₁₁参数）小于-15 dB。