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引言频率高于工作频带时,可能发生干扰振荡的问题仍然是研究现代军用高性能行波管的基本问题。返波振荡看来是双模螺旋线行波管达到较高峰值功率或较大脉升能力的主要阻碍。带边振荡限制了高功率耦合腔行波管可能获得的带宽。在极限功率范围内,利用分布损耗来抑制振荡是很有效的,因为这种方法容许低损耗的慢波线输出段缩短三分之一或更多而不降低效率。其典型例子是,起振电流增大到原来的3～5倍。然而,对于很多双模行波管或高电压行波管这是不够的,因为这些行波管的工作频带
Introduction Frequency higher than the operating band, the problem may occur interference oscillation is still the study of modern military high-performance traveling wave tube basic issues. Back-wave oscillation appears to be a major hurdle to the ability of dual-mode helical traveling-wave tubes to reach higher peak powers or larger pulses. Band-edge oscillations limit the bandwidth available for high-power coupled-cavity TWTs. In the limit power range, the use of distribution losses to suppress oscillation is very effective, because this method allows low-loss slow wave line output section shortened by one third or more without reducing efficiency. The typical example is, start-up current increased to 3 to 5 times the original. However, for many dual-mode traveling wave tubes or high-voltage traveling wave tubes this is not sufficient because the operating band of these TWTs