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

被引：1
|
作者：
Zhou Z. [1 ,2 ]
Chen J. [1 ,2 ]
Weng M. [1 ,2 ]
Lin S. [1 ,2 ]
Cao M. [1 ,2 ]
机构：
[1] Key Laboratory of Physical Electronics and Devices Ministry of Education, Xi'an Jiaotong University, Xi'an
[2] Faculty of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an
来源：
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2023年 / 57卷 / 11期
关键词：
circular waveguide; coaxial; conical gradient line; coupled wave theory; mode converter; mode measurement;
D O I：
10.7652/xjtuxb202311017
中图分类号：
学科分类号：
摘要：
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 TM01 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-TM0] modes. 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-TEn mode and higher-order modes beyond TM01, highlighting a relatively high purity of TM01 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. © 2023 Xi'an Jiaotong University. All rights reserved.
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页码：171 / 180and205
相关论文
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