Design of compact directional coupler for X-band relativistic triaxial klystron amplifier

He Changjie; Zhang Wei; Ju Jinchuan; Xu Liurong; Cao Hongchang

doi:10.11884/HPLPB202335.220370

Volume 35 Issue 5

Apr. 2023

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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

Citation:

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

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Design of compact directional coupler for X-band relativistic triaxial klystron amplifier

doi: 10.11884/HPLPB202335.220370

College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China

Received Date: 2022-10-23
Accepted Date: 2023-03-02
Rev Recd Date: 2023-03-02

Available Online: 2023-03-09

Publish Date: 2023-04-07

Abstract

Abstract

To realize the on-line measurement of power, frequency and phase of modular relativistic triaxial klystron amplifier, a compact directional coupler with high directivity and bandwidth is simulated and experimentally studied. Based on the theoretical analysis of the pinhole coupling theory and the phase superposition principle, a dual-hole compact directional coupler is designed. On this basis, the main and auxiliary waveguides are connected orthogonally, and the coupling holes are distributed along the axial and angular directions, which further shortens the length of the coupler. The parameters of the coupler are optimized by electromagnetic simulation. The simulation results show that when the center frequency is 10 GHz, the coupling degree of the ordinary dual-hole directional coupler to the TM₀₁ mode is −60.68 dB, and the directivity is greater than 20 dB in the bandwidth of 250 MHz, and the coupling area length is 3.49 cm. The coupling degree of the improved directional coupler to the TM₀₁ mode is −58.1 dB, and the directivity is greater than 20 dB in the bandwidth of 300 MHz. At this time, the length of the coupling zone is only 1.8 cm (about 0.6λ）. The cold cavity experimental results of the coupler are in good agreement with the simulation results.
- high power microwave,
- triaxial klystron amplifier,
- directional coupler,
- X-band

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References(11)

References

[1]	Rostov V V, Elchaninov A A, Romanchenko I V, et al. A coherent two-channel source of Cherenkov superradiance pulses[J]. Applied Physics Letters, 2012, 100: 224102. doi: 10.1063/1.4723845
[2]	Ju Jinchuan, Zhang Jun, Qi Zumin, et al. Towards coherent combining of X-band high power microwaves: phase-locked long pulse radiations by a relativistic triaxial klystron amplifier[J]. Scientific Reports, 2016, 6: 30657. doi: 10.1038/srep30657
[3]	Zhang Wei, Ju Jinchuan, Zhang Jun, et al. A high-gain and high-efficiency X-band triaxial klystron amplifier with two-stage cascaded bunching cavities[J]. Physics of Plasmas, 2017, 24: 123118. doi: 10.1063/1.5011057
[4]	孙钧, 胡咏梅, 张立刚, 等. 圆波导定向耦合器在高功率微波测量中的应用[J]. 强激光与粒子束, 2014, 26:063040 doi: 10.11884/HPLPB201426.063040 Sun Jun, Hu Yongmei, Zhang Ligang, et al. Application of circular waveguide couplers in high power microwave measurement[J]. High Power Laser and Particle Beams, 2014, 26: 063040 doi: 10.11884/HPLPB201426.063040
[5]	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
[6]	刘义. 高功率微波功率测量相关技术研究[D]. 长沙: 国防科技大学, 2010 Liu Yi. Analysis of correlative technology on power measurement of high power microwave[D]. Changsha: National University of Defense Technology, 2010
[7]	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
[8]	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
[9]	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
[10]	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
[11]	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