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摘要

扩展互作用速调管是一种在毫米波、亚毫米波频段具有广泛应用前景的电真空器件. 本文基于运动学理论、感应电流定理和电荷守恒定律, 推导一间隙到五间隙谐振腔的电子负载电导和电子负载电纳的表达式, 分析了谐振腔间隙宽度、间隙数和间隙周期等参数对电子注与微波之间能量交换的影响和谐振腔谐振频率的影响. 根据理论分析结果, 采用三维电磁仿真软件设计了一款工作于G波段的扩展互作用速调管, 仿真结果显示, 当电子注电压为24 kV、电流为0.15 A、输入功率为200 mW、轴向引导磁感应强度为0.8 T时, 在中心频率217.94 GHz处, 输出功率为225.5 W, 电子效率为6.26%, 增益为30.5 dB, 3 dB带宽约为470 MHz.

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Abstract

Extended interaction klystron is a very important millimeter-wave and sub-millimeter-wave vacuum electron device with many actual and potential applications, such as space-borne cloud profiling radar, communication, imaging system, precision guided missiles, etc. Kinematical theory and space charge wave theory are extensively used to analyze the bunching process of electrons. Kinematical theory is precise when electron beam is especially small because the influence of space charge effect is ignored, while space charge wave theory is accurate when the modulation of electron beam is small since it is based on the premise of small amplitude. Based on kinematical theory, law of induce current, principle of charge conservation in a one-dimensioanl mode and small signal condition, the influence of electron beam on standing wave electric field in multiple-gap cavity is analyzed, and the expression of beam-loading conductance and beam-loading susceptance in multiple-gap cavity are derived. The influence of the direct current transmit angle of single gap, the number of multiple gaps and the direct current transmit angle of between center of adjacent gaps on beam-loading conductance and beam-loading susceptance are analyzed. The results show that the beam-loading conductance and beam-loading susceptance of multiple-gap cavity can change to a bigger extent when the number of cavity gaps is bigger, which means that the maximum beam-wave conversion efficiency and the range of loaded frequency increase with the number of cavity gaps increasing. The results also show that the direct current transmit angle between centers of adjacent gaps is the most important parameter for the beam-wave interaction effect. Based on the above analysis, a G-band extended interaction klystron amplifier consisting of three five-gap cavities is designed by an three-dimensional PIC code. An output power of 225.5 W at 217.94 GHz with an efficiency of 6.26%, whose gain and 3 dB bandwidth are 30.5 dB and 470 MHz respectively, is obtained by simulation. This study is of great significance for the physical design and process in engineering the G-band extended interaction klystron amplifier.

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作者及机构信息

通信作者:陈洪斌,17721915695@163.com

基金项目:中国科学技术部项目(批准号: 2018YFC0115001)资助的课题.

Authors and contacts

Corresponding author:Chen Hong-Bin,17721915695@163.com

Funds:Project supported by the Program of the Ministry of Science and Technology of China (Grant No. 2018YFC0115001).

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参考文献

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施引文献

下载: 全尺寸图片幻灯片

谐振腔	纵向工作模式	谐振频率/GHz	固有品质因数Q₀	外观品质因数Q_ext	起始位置/mm
输入腔	${\text{π}}$模	218	413	380	0
中间腔	${\text{π}}$模	218.05	413	∞	4.87
输出腔	${\text{π}}$模	218	413	1940	7.77

下载: 导出CSV

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