行波再生反馈振荡非线性跳频与多模机理研究

项目名称： 行波再生反馈振荡非线性跳频与多模机理研究

项目编号： No.61201001

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 电子学与信息系统

项目作者： 高鹏

作者单位： 电子科技大学

项目金额： 25万元

中文摘要： 电真空器件源其高效、高能、高稳定性等特点，在亚毫米波以及更高的太赫兹频段仍具有不可替代的地位，为目前国内外研究的重点。随着频率的进一步提高，器件尺寸过小，功率容量已趋于极限，为进一步提高输出功率，近年来提出了"采用引入反馈回路将行波放大后再生振荡的方式获得稳定输出"的方案，在对行波再生反馈振荡系统的研究中，国内外学者的研究重心集中在微细加工方面，其中，遇到了输出频率点不容易控制，易发生跳频与多模现象等问题，但目前仍缺乏此类现象的物理机理解释。为此，本项目研究行波再生反馈振荡的非线性机理，首先建立再生振荡的线性与非线性数学物理模型，包括折叠波导中的注波互作用模型、正向与反馈回路电磁波传播模型与振荡合成理论模型；然后，根据模型对再生振荡中的跳频与多模现象进行非线性分析，提出系统优化改进设计方法；最后根据实验结果验证理论的正确性。总之，研究成果为今后类似振荡器信号源的研制奠定理论基础。

中文关键词： 行波；再生反馈；振荡；跳频；多模

英文摘要： Vacuum electronic devices due to their efficient, powerful and reliable performance, are still first choices in sub-millimeter wave to terahertz regime, which has motivated enourmous researches. By increasing the working frequency, the size of the devices needs to be very compact, which meets the challenge of power limit. With a fraction of the output power recirculated to the amplifier terminal, regenerative feedback oscillators have been proposed and validated as very attractive sub-millimeter wave and THz source devices. Recently, a lot of investigations have been done on micro-fabrications of such devices. However, unstable characteristics have been found as output frequency exhibits step tuning and multi-mode behaviors, while the physical models of such behaviors have not been discussed and explained yet.In this case, this project studys the non-linear characteristics of traveling wave regenerative feedback oscillatiors. Firstly the linear and non-linear physical and mathmatical model of the oscillation is built, including the beam-wave interaction model in the folded waveguide, the EM transmitting model in both amplifying and feedback circuit, and the composition model of the oscillation frequencies; Secondly the frequency step tuning and multi-mode characteristics are studied, a new design method to imple

英文关键词： Traveling wave；Regenerative feedback；Oscillation；Frequency step-tuning；Multi-mode