抑制空间行波管三阶交调失真的信号注入技术  

Third-Order Intermodulation Distortion Suppression Based on Signal Injection in Space TWT

作　　者：赵东明[1] 唐康淞[2] 李实[2] 夏克文[1] 

机构地区：[1]河北工业大学信息工程学院,天津300401 [2]中国科学院电子学研究所微波器件中心,北京100080

出　　处：《真空电子技术》2010年第3期4-10,共7页Vacuum Electronics

基　　金：国家自然科学基金资助项目(60678005);河北省教育厅科学研究计划项目(2008315)

摘　　要：为了抑制空间行波管非线性特性产生的交调失真,本文通过理论分析、计算机仿真和实验验证,分别研究了谐波、交调和混合信号注入技术对空间行波管三阶交调(IM3)分量的抑制情况。实验结果表明:IM3注入技术能够得到25.2 dB的IM3最大抑制量,明显大于谐波注入技术的12.7 dB,两者对IM3失真分量的抑制效果都很良好,且就窄带空间行波管而言IM3注入技术比谐波注入技术更具优势。通过进一步仿真实验,证明双IM3注入技术可以在两个IM3频率处分别产生46 dB和53 dB的最佳抑制量,且混合注入谐波和交调信号也能最大抑制36.9 dB。This paper studies systematically the signal injection technique for suppressing the two-tone third-order intermodulation（IM3） components in space traveling wave tube.Through the three respects of theoretical analysis,computer simulation and experimental verification,the suppression for IM3 components are obtained by harmonic,IM3 and mixed-signal injection respectively,and a direct comparison of the several signal injection approaches is proposed.The experimental results show that maximum IM3s suppression of up to 25.2 dB is achieved by IM3 injection,which is bigger than the 12.7 dB by second-harmonic injection,the two approaches are all available in suppressing IM3 components,IM3 injection performs better than second-harmonic injection for narrow-band space TWT.The further simulation results prove that both upper and lower IM3 components are suppressed by 46 and 53 dB with simultaneous injection of dual IM3 signal in turn,meanwhile,mixed signal injection also reduces the IM3 level by 36.9 dB.

关 键 词：空间行波管 交调失真抑制 信号注入技术 二次谐波 三阶交调 

分 类 号：TN124[电子电信—物理电子学]