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分析了单注折叠波导行波管增益和带宽的限制因素,提出了采用双注结构提高单位长度增益和拓宽带宽的方法。模拟结果表明,在工作电压和单注电流相同的情况下,采用同速双注(两电子注速度相同)可将高频互作用系统饱和输出功率提升至单注时的2.8倍,互作用效率提高了1.4倍,增益饱和长度缩短了5个几何周期;采用非同速双注可在更宽的频率范围内满足同步条件,展宽了带宽。设计了一工作频率为25~29.5 GHz的宽带折叠波导行波管,3 dB增益带宽可达到16.5%,约占冷带宽(12 GHz,22~34 GHz)的38%,输出功率在27 GHz时达到最大为256 W。另外,文中对由电路内部反射引起的增益不稳定性进行了分析,并给出了解决方法。
The limiting factors of the gain and bandwidth of the single-folded waveguide TWT are analyzed. A method to increase the gain per unit length and broaden the bandwidth by the double-bet structure is proposed. The simulation results show that when the operating voltage is the same as the single injection current, the double injection speed (same injection speed) can increase the saturated output power of the high frequency interaction system to 2.8 times of the single injection. The interaction efficiency Increased by 1.4 times, the length of gain saturation shortened five geometric cycles; using non-synchronous double injection can meet the synchronization conditions in a wider frequency range, broaden the bandwidth. A wideband folded waveguide TWT with frequency of 25 ~ 29.5 GHz is designed. The gain bandwidth of 3 dB can reach 16.5%, accounting for about 38% of the cold band (12 GHz, 22 ~ 34 GHz). When the output power is 27 GHz The maximum is 256 W. In addition, the paper analyzes the gain instability caused by the internal reflection of the circuit and gives the solution.