Mode Competition of Low Voltage Backward Wave Oscillator near 500 GHz with Parallel Multi-Beam

IF 1.6 4区计算机科学 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

Chinese Journal of Electronics Pub Date : 2024-03-01 DOI:10.23919/cje.2022.00.003

Xiaoyan Zhao;Jincheng Hu;Haoran Zhang;Sidou Guo;Yuming Feng;Lin Tang;Kaichun Zhang;Diwei Liu;Shilong Pan

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Abstract

A backward wave oscillator with parallel multiple beams and multi-pin slow-wave structure (SWS) operating at the frequency above 500 GHz is studied. Both the cold-cavity dispersion characteristics and CST Particle Studio simulation results reveal that there are obvious mode competition problems in this kind of terahertz source. Considering that the structure of the multi-pin SWS is similar to that of two-dimensional photonic crystals, we introduce the defects of photonic crystal with the property of filtering into the SWS to suppress high-order modes. Furthermore, a detailed study of the effect of suppressing higher-order modes is carried out in the process of changing location and arrangement pattern of the point defects. The stable, single-mode operation of the terahertz source is realized. The simulation results show that the ratio of the output peak power of the higher-order modes to that of the fundamental mode is less than 1.9%. Also, the source can provide the output peak power of 44.8 mW at the frequency of 502.2 GHz in the case of low beam voltage of 4.7 kV.

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采用平行多波束的 500 GHz 附近低压后向波振荡器的模式竞争

研究了一种在 500 GHz 以上频率工作的具有平行多波束和多引脚慢波结构（SWS）的后向波振荡器。冷腔色散特性和 CST Particle Studio 仿真结果都表明，这种太赫兹源存在明显的模式竞争问题。考虑到多引脚 SWS 的结构类似于二维光子晶体，我们在 SWS 中引入了具有滤波特性的光子晶体缺陷，以抑制高阶模式。此外，我们还详细研究了在改变点缺陷位置和排列模式的过程中抑制高阶模式的效果。实现了太赫兹源的稳定单模运行。模拟结果表明，高阶模式的输出峰值功率与基频模式的输出峰值功率之比小于 1.9%。此外，在 4.7 千伏低束流电压的情况下，该源在 502.2 千兆赫频率下可提供 44.8 毫瓦的输出峰值功率。

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来源期刊

Chinese Journal of Electronics 工程技术-工程：电子与电气

CiteScore

3.70

自引率

16.70%

发文量

342

审稿时长

12.0 months

期刊介绍： CJE focuses on the emerging fields of electronics, publishing innovative and transformative research papers. Most of the papers published in CJE are from universities and research institutes, presenting their innovative research results. Both theoretical and practical contributions are encouraged, and original research papers reporting novel solutions to the hot topics in electronics are strongly recommended.