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行波管是唯一适用于宽频带的微波放大器,它的固有的并在一个倍频程内能提供比任何放大器件都要高的增益频宽乘积的性质,使它成为一个有源电子对抗系统的关键元件,在最佳效能情况,电子对抗系统必须同时能响应一个宽频带,并在最严竣的环境下的（轮船或飞机）敌方雷达讯号,于是依次转发一个欺骗或错误距离的讯息。所以,系统必须工作在一个非常宽的频率范围,讯号强度、脉冲宽度仍不损失其伪装性质。
Traveling wave tubes are the only microwave amplifiers available for wideband applications. Their inherent nature and the fact that they provide a higher gain bandwidth product than any amplifier in one octave make it an active electronic countermeasure system In the best performance scenario, the electronic countermeasure system must simultaneously respond to a wide band of radar signals (in ships or planes) and in the most severe environments, and then forward a message of deceptive or erroneous distance . Therefore, the system must work in a very wide frequency range, the signal strength, the pulse width is still not lost its camouflage nature.