Research of Mode Converter from Coaxial Transverse Electromagnetic Wave to Circular Waveguide TM<sub>01</sub>

ZHOU Zhenyu; CHEN Jiahui; WENG Ming; LIN Shu; CAO Meng

doi:10.7652/xjtuxb202311017

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Research of Mode Converter from Coaxial Transverse Electromagnetic Wave to Circular Waveguide TM₀₁

更新时间：2025-12-08

- Research of Mode Converter from Coaxial Transverse Electromagnetic Wave to Circular Waveguide TM₀₁
- Vol. 57, Issue 11, Pages: 171-180+205(2023)
- 作者机构：
  
  1. 西安交通大学电子物理与器件教育部重点实验室,西安,710049
  2. 西安交通大学电子与信息学部,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202311017
  CLC： TN98
- Online First：10 November 2023，
  
  Published：2023
- 稿件说明：
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ZHOU Zhenyu, CHEN Jiahui, WENG Ming, et al. Research of Mode Converter from Coaxial Transverse Electromagnetic Wave to Circular Waveguide TM₀₁[J]. 2023, 57(11): 171-180+205. DOI: 10.7652/xjtuxb202311017.
DOI：

ZHOU Zhenyu, CHEN Jiahui, WENG Ming, et al. Research of Mode Converter from Coaxial Transverse Electromagnetic Wave to Circular Waveguide TM₀₁[J]. 2023, 57(11): 171-180+205. DOI: 10.7652/xjtuxb202311017. DOI：

摘要

为了对高功率微波(HPM)在线测量系统中的核心器件耦合器进行准确标定

采用锥形渐变加圆柱的内导体结构

设计了一种S波段同轴TEM模式转圆波导TM

模式的模式转换器。从模式耦合和阻抗匹配的基本思路出发

对模式转换过程、工作带宽的扩展以及非TM

模式的抑制等方面进行了理论分析。使用CST仿真软件对模式转换器的结构参数进行了优化

对模式转换器的反射性能、传输性能、工作带宽、输出模式和脉冲响应进行了实验测量。仿真和实验结果均表明:所设计的模式转换器中几乎不含有TE

和TM

模式以上的高次模式

模式纯度较高; 在工作频点2.1 GHz处的反射系数小于-30 dB

传输系数大于-0.2 dB

实测模式转换效率可以达到96%以上

工作带宽为74 MHz

而且脉冲响应时间很短。该模式转换器目前已成功应用于S波段在线耦合器的标定之中。该研究为HPM在线测量过程中模式转换器的设计提供了新思路。

Abstract

To ensure accurate calibration of the core device coupler in the high power microwave(HPM)online measurement system

this study presents the design of an S band coaxial TEM to circular waveguide TM

mode converter. The converter incorporates a tapered gradient and cylindrical inner conductor structure. Starting from the basic ideas of mode coupling and impedance matching

theoretical analysis was conducted to explore mode conversion

operating bandwidth expansion

and suppression of non-TM

odes. The structural parameters of the mode converter were optimized using CST simulation software. Experimental measurements were carried out to assess reflection performance

transmission performance

working bandwidth

output mode

and pulse response of the mode converter. Both simulation and experimental results indicate that the mode converter contains almost non-TE

mode and higher-order modes beyond TM

highlighting a relatively high purity of TM

mode. At the operating frequency point of 2.1 GHz

the reflection coefficient is less than -30 dB

and the transmission coefficient is more than -0.2 dB. The measured mode conversion efficiency exceeds 96%

the operating bandwidth is 74 MHz

and the pulse response time is very short. The mode converter has been successfully applied to the calibration of the S band online coupler

offering a new approach for mode converter design in the HPM online measurement processes.

关键词

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references

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Research of Mode Converter from Coaxial Transverse Electromagnetic Wave to Circular Waveguide TM01

DOI：10.7652/xjtuxb202311017

摘要

Abstract

关键词

Keywords

references

Research of Mode Converter from Coaxial Transverse Electromagnetic Wave to Circular Waveguide TM₀₁