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

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外文摘要：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.

外文关键词：

Mode competitionBackward wave oscillatorMulti-pin slow-wave structureParallel multiple beamsDefects

作者：

Xiaoyan ZHAO、Jincheng HU、Haoran ZHANG、Sidou GUO、Yuming FENG、Lin TANG、Kaichun ZHANG、Diwei LIU

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作者单位：

THz Center,School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 610054,China

School of Computer Science,Southwest Petroleum University,Chengdu 610500,China

基金：

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central UniversitiesFund of Key Laboratory of Terahertz(THz)Technology,Ministry of Education,China

项目编号：

2017YFA07010036198810261921002ZYGX2020ZB008

出版年：

2024

DOI：

10.23919/cje.2022.00.003

电子学报(英文)

CSTPCDEI

ISSN：1022-4653

年,卷(期)：2024.33(2)

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