毫米波空间行波管慢波结构的优化设计  

Optimization Design of Slow-Wave Structure for Space-Borne Millimeter-Wave Traveling Wave Tube

作　　者：陈喜艳[1,2] 何俊[1] 黄明光[1] 相东[1,2] Chen Xiyan He Jun Huang Mingguang Xiang Dong(Key Laboratory of High Power Microwave Sources and Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China University of Chinese Academy of Sciences, Belting 100049, China)

机构地区：[1]中国科学院电子学研究所中国科学院高功率微波源与技术重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《真空科学与技术学报》2017年第1期34-39,共6页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金项目(No.61401430)

摘　　要：空间行波管推向饱和工作时,其传输特性变得越来越非线性,将导致非线性失真。双渐变螺旋线慢波结构是目前最常用的既能提高效率又能减小非线性失真的慢波结构。本文在双渐变结构的基础上,提出了多渐变结构,分析新增渐变段对空间行波管工作状态的影响。通过多线路参数优化设计,K波段空间行波管在保证输出功率和效率几乎不变的情况下,非线性失真明显降低。相移由51.6°减小到20.8°,AM/PM值由3.9°/d B减小到1.9°/d B,并且电子效率几乎没有发生变化。A novel type of the multi-tapering slow-wave structure was developed,for the space-borne millimeter-wave traveling wave tube（TWT）,to address the problem of the nonlinear distortion when space TWT works at close to the saturated input power,based on the dynamic velocity tapering technique usually used in helical slowwave structure. The impact of the geometry of each tapering section of the novel multi-tapering structure on the TWT transfer characteristics,including the saturated output power,saturated gain,phase shift and AM/PM ratio,was numerically simulated with lab-developed software Microwave-Tube-Simulator-Suite（MTSS）,for design optimization of TWT2. The simulated results show that the newly-optimized multi-tapering structure significantly reduces the nonlinear distortion of space TWT in K-band. To be specific,at the given output power and efficiency,the phase-shift decreases from 51. 6° to 20. 8° and the AM/PM ratio drops from 3. 9°/d B to 1. 9°/d B.

关 键 词：空间行波管 结构优化 非线性失真 相移 AM/PM 

分 类 号：O462.1[理学—电子物理学]