Slow-wave circuits and power synthesis techniques of folded waveguides for terahertz applications

Xiang Huaixin; Miao Min; Li Zhensong; Bian Xingwang

doi:10.11884/HPLPB202436.240007

Volume 36 Issue 12

Nov. 2024

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Xiang Huaixin, Miao Min, Li Zhensong, et al. Slow-wave circuits and power synthesis techniques of folded waveguides for terahertz applications[J]. High Power Laser and Particle Beams, 2024, 36: 123003. doi: 10.11884/HPLPB202436.240007

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Xiang Huaixin, Miao Min, Li Zhensong, et al. Slow-wave circuits and power synthesis techniques of folded waveguides for terahertz applications[J]. High Power Laser and Particle Beams, 2024, 36: 123003. doi: 10.11884/HPLPB202436.240007

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Slow-wave circuits and power synthesis techniques of folded waveguides for terahertz applications

doi: 10.11884/HPLPB202436.240007

Xiang Huaixin^{1, 2, 3
,},
Miao Min^{1, 2, 3},
Li Zhensong^{1, 2, 3
,
,},
Bian Xingwang⁴

1.
Key Laboratory of Information and Communication Systems, Ministry of Industry and Information Technology (Beijing Information Science & Technology University), Beijing 100192, China
2.
Academy of Smart IC and Network, Beijing Information Science & Technology University, Beijing 100192, China
3.
Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument, Beijing Information Science & Technology University, Beijing 100192, China
4.
National Key Laboratory of Science and Technology on Vacuum Electronics, Beijing Vacuum Electronics Research Institute, Beijing 100015, China

Received Date: 2024-05-04
Accepted Date: 2024-10-30
Rev Recd Date: 2024-10-19

Available Online: 2024-10-18

Publish Date: 2024-11-08

Abstract

Abstract

Aiming to address the bottleneck of low output power in terahertz band traveling wave tubes and responding to the distinct demand for compact design, this paper proposes a 0.34 THz folded waveguide traveling wave tube structure with power combination inside the tube. Firstly, the high-frequency characteristics of the folded waveguide slow-wave structure are investigated. Electromagnetic full-wave simulations are used to obtain its dispersion characteristics and coupling impedance. The normalized phase velocity at 0.34 THz is 0.248 and the coupling impedance is 0.46 Ω. Secondly, a 3 dB directional coupler structure for in-tube power combination is designed. The analysis indicates that its amplitude balance is within ±0.19 dB in the range of 0.31–0.368 THz, and the isolation exceeds 24 dB. Finally, the basic structure of the folded waveguide traveling wave tube based on the in-tube combination of the 3 dB directional coupler is demonstrated. The simulation model is constructed, and the results show a maximum output power of 9.16 W, a gain of 26.6 dB, and a 3 dB bandwidth of 21 GHz. For comparison, the output power of a single folded waveguide traveling wave tube is 6.18 W. The output power of the in-tube synthesized folded waveguide traveling wave tube is 1.48 times that of the single traveling wave tube. Moreover, compared with the design of a dual-tube assembly using conventional external power combination structure, the lateral size is reduced by at least 56.5%.
- terahertz,
- folded waveguide traveling-wave tube,
- 3 dB directional coupler,
- power combination,
- beam-wave interaction

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References(19)

References

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