Design of high-power TM<sub>01</sub> online mode selection coupling device

Zhang Ligang; Tan Weibing; Li Xiaoze; Zhu Xiaoxin; Hu Xianggang

doi:10.11884/HPLPB202537.240159

Volume 37 Issue 1

Dec. 2025

Turn off MathJax

Article Contents

Article Navigation > High Power Laser and Particle Beams > 2025 > 37(1): 013006

Zhang Ligang, Tan Weibing, Li Xiaoze, et al. Design of high-power TM01 online mode selection coupling device[J]. High Power Laser and Particle Beams, 2025, 37: 013006. doi: 10.11884/HPLPB202537.240159

Citation:

Zhang Ligang, Tan Weibing, Li Xiaoze, et al. Design of high-power TM₀₁ online mode selection coupling device[J]. High Power Laser and Particle Beams, 2025, 37: 013006. doi: 10.11884/HPLPB202537.240159

Citation:

PDF( 11985 KB)

Design of high-power TM₀₁ online mode selection coupling device

doi: 10.11884/HPLPB202537.240159

Northwest Institute of Nuclear Technology, Xi’an 710024, China

Received Date: 2024-05-06
Accepted Date: 2024-11-11
Rev Recd Date: 2024-11-06

Available Online: 2024-11-15

Publish Date: 2025-12-13

Abstract

Abstract

To solve the problems of low inhibition of parasitic mode and measurement accuracy is susceptible to interference of parasitic modes in traditional high power microwave online measurement devices, a high-power TM₀₁ mode coupling device is studied, which is applied to the Ku-band relativistic backward wave oscillator (RBWO) online measurement system. Due to the RBWO emission’s angular inhomogeneity, asymmetric modes is generated, and the traditional single-arm porous circular waveguide coupler cannot solve the competition problem between the TM₀₁ mode and the asymmetric modes, which generally leads to the detection waveform distortion and coupling degree judgment deviation and seriously affects the accuracy of the online evaluation of the output power of TM₀₁ mode of the RBWO. For this reason, combining the four-arm porous coupling structure with the TM₀₁ mode selection network, a novel online mode-selective coupling device is proposed in this paper. Using the field structure difference of different waveguide modes, the proposed device realizes the differential coupling of TM₀₁ mode and other parasitic modes and solves the problem of inaccurate online test power caused by parasitic mode interference. The simulation results show that the coupling degree of the proposed new coupler to TM₀₁ mode is more than 20 dB higher than that of the other modes, and the on-line test waveform and power measured in the high-power experiment are in good agreement with the radiated field test waveform and power, and the coupling stability is significantly improved.
- high power microwave,
- microwave measurement,
- TM₀₁ mode-selective circular waveguide coupler,
- magic T

FullText(HTML)

References(14)

References

[1]	刘国, 罗勇, 王建勋, 等. 高功率圆波导多孔阵列定向耦合器设计[J]. 强激光与粒子束, 2012, 24(2):417-422 doi: 10.3788/HPLPB20122402.0417 Liu Guo, Luo Yong, Wang Jianxun, et al. Design of high power circular multi-aperture array directional coupler[J]. High Power Laser and Particle Beams, 2012, 24(2): 417-422 doi: 10.3788/HPLPB20122402.0417
[2]	Zhang Jun, Jin Zhenxing, Yang Jianhua, et al. Recent advance in long-pulse HPM sources with repetitive operation in S-, C-, and X-bands[J]. IEEE Transactions on Plasma Science, 2011, 39(6): 1438-1445.
[3]	唐涛, 巩华荣, 王文祥. 过模波导定向耦合器设计的探讨[J]. 真空电子技术, 2014(6):5-8 Tang Tao, Gong Huarong, Wang Wenxiang. The consideration of the directional coupler with overmoded waveguide[J]. Vacuum Electronics, 2014(6): 5-8
[4]	白珍. 过模O型Cerenkov高功率微波源输出模式诊断方法研究[D]. 长沙: 国防科学技术大学, 2012 Bai Zhen. Research on the diagnosis methods of the output modes generated by overmoded O-type Cerenkov High Power Microwave source[D]. Changsha: National University of Defense Technology, 2012
[5]	白珍, 李国林, 张军. X波段高功率微波选模定向耦合器[J]. 强激光与粒子束, 2013, 25(7):1747-1750 doi: 10.3788/HPLPB20132507.1747 Bai Zhen, Li Guolin, Zhang Jun. X-band high power microwave mode-selective directional coupler[J]. High Power Laser and Particle Beams, 2013, 25(7): 1747-1750 doi: 10.3788/HPLPB20132507.1747
[6]	Wang Wenxiang, Gong Yubin, Yu Guofen, et al. Mode discriminator based on mode-selective coupling[J]. IEEE Transactions on Microwave Theory and Techniques, 2003, 51(1): 55-63. doi: 10.1109/TMTT.2002.806947
[7]	谢处方, 饶克谨. 电磁场与电磁波[M]. 4版. 北京: 高等教育出版社, 2006 Xie Chufang, Rao Kejin. Electromagnetic field and electromagnetic wave[M]. 4th ed. Beijing: Higher Education Press, 2006
[8]	曹乃胜, 罗勇, 王建勋. 圆波导-矩形波导小孔耦合定向耦合器设计[J]. 强激光与粒子束, 2008, 20(4):637-640 Cao Naisheng, Luo Yong, Wang Jianxun. Design of aperture-coupling directional coupler[J]. High Power Laser and Particle Beams, 2008, 20(4): 637-640
[9]	王文祥. 微波工程技术[M]. 北京: 国防工业出版社, 2009 Wang Wenxiang. Microwave engineering technology[M]. Beijing: National Defense Industry Press, 2009
[10]	何昌杰, 张威, 巨金川, 等. 用于X波段模块化相对论速调管放大器在线测量的紧凑型定向耦合器设计[J]. 强激光与粒子束, 2023, 35:053004 doi: 10.11884/HPLPB202335.220370 He Changjie, Zhang Wei, Ju Jinchuan, et al. Design of compact directional coupler for X-band relativistic triaxial klystron amplifier[J]. High Power Laser and Particle Beams, 2023, 35: 053004 doi: 10.11884/HPLPB202335.220370
[11]	张立刚, 宋志敏, 李小泽, 等. X波段宽带圆波导耦合器设计[J]. 现代应用物理, 2015, 6(2):98-101 Zhang Ligang, Song Zhimin, Li Xiaoze, et al. Design of a broad band circular waveguide coupler at X-band[J]. Modern Applied Physics, 2015, 6(2): 98-101
[12]	Chen Zaigao. Research on effect of emission uniformity on X-band relativistic backward oscillator using conformal PIC code[J]. Physics of Plasmas, 2016, 23: 073115. doi: 10.1063/1.4958947
[13]	Zhang Dian, Zhang Jun, Zhong Huihuang, et al. Asymmetric modes decomposition in an overmoded relativistic backward wave oscillator[J]. Physics of Plasmas, 2014, 21: 093102. doi: 10.1063/1.4894480
[14]	喻寄航, 宫玉彬, 王战亮, 等. X波段高功率宽带选模定向耦合器[J]. 强激光与粒子束, 2018, 30:023003 doi: 10.11884/HPLPB201830.170343 Yu Jihang, Gong Yubin, Wang Zhanliang, et al. X-band high power broadband mode-selective directional coupler[J]. High Power Laser and Particle Beams, 2018, 30: 023003 doi: 10.11884/HPLPB201830.170343