负-正相速跳变慢波结构行波管的小信号理论辅助分析  

Analysis in Small Signal Theory of Traveling-Wave-Tube with Negative-Positive Phase Velocity Tapering Slow-Wave Structure

作　　者：易红霞[1,2] 刘濮鲲[1] 肖刘[1] 郝保良[1,2] 李飞[1,2] 

机构地区：[1]中国科学院电子学研究所,北京100190 [2]中国科学院研究生院,北京100190

出　　处：《真空科学与技术学报》2011年第4期406-412,共7页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金重点项目(批准号:60931001);国家自然科学基金青年科学基金资助项目(批准号:60801030)

摘　　要：应用Pierce小信号理论,对设计高效率宽带行波管的一般方法进行分析,采用螺距跳变渐变技术,形成了相速减少和相速增加两段结合的输出段作为宽带行波管的慢波结构,并采用散热性能好的半金属化夹持杆慢波结构产生反常色散曲线。为了提高行波管工作频带的电子效率,在高频点（18 GHz）,利用遗传算法并调用1维BWIS互作用程序,对相速减少和相速增加两段相结合输出段的慢波结构进行了优化。计算结果表明：行波管在工作频带（618 GHz）获得了比较平坦的饱和输出功率,为下一步实际研制宽带行波管提供了理论依据。The fundamental design technique of the high efficiency,ultra-broad band helix traveling wave tube（TWT） with two-section output circuit was analyzed on the basis of Pierce small signal theory;and a novel helix pitch profile with reduced phase-velocity followed by a positive phase velocity taper was shape.The newly-developed slow wave structure（SWS）,fabricated of semi-metallic support rods with good thermal dissipation capability,is capable of generating the negative dispersion characteristics to reduce the 2nd harmonic fraction of a wide-band TWT.To improve the electronic efficiency of the TWT,the helix pitch profile at 18 GHz was optimized by means of 1-D beam-wave interaction simulator（BWIS）.The simulated results show that the TWT with the newly-developed SWS easily generated a flat,saturated output power at its operating frequency-band of 6～18 GHz.

关 键 词：螺旋线行波管 宽带 小信号理论 优化设计 慢波结构 

分 类 号：TN124[电子电信—物理电子学]