Ka波段宽频带高线性空间行波管研制

Development of Ka-band Broadband, High-linearity Space Traveling Wave Tube

该文对Ka波段空间行波管宽频带、高线性、高效率的慢波系统进行设计,通过动态渐变技术实现了低相位失真、高效率的指标要求。在此设计基础上研制的Ka波段空间行波管实现了宽频带(25~27 GHz)、低非线性失真(非线性相移≤40°,AM/PM≤2.86°/d B,三阶交调≥10.39 d Bc)、高效率(总效率≥51.7%)。经数传系统测试,误码P_e优于10^(-6)的情况下C/N_0有2.4 d B裕度,满足了卫星数传系统对多通道并行传输方案的工作需求。

In this paper, the design of Ka-band broadband, high-linearity and high-efficiency slow-wave system is proposed for Space Traveling Wave Tube（TWT）. The dynamic phase-shifting technique is used to achieve low phase distortion and high efficiency. Based on this design, the Ka-band TWT is developed to realize wideband（25-27 GHz）, low nonlinear distortion（non-linear phase shift ≤ 40 °, AM/PM ≤ 2.86 °/d B, third order intermodulation ≥10.39 d Bc）, high efficiency（total efficiency ≥51.7%）. By the digital transmission system test, the error code eP is better than 10^-6 in the case of 0 C/N 2.4 d B margin, it meets the satellite data transmission system for multi-channel parallel transmission program work requirements.