带宽为10％或更宽的大功率行波管越来越多地采用耦合谐振腔一线路。这些慢波结构具有负色散,工作在一次空间谐波,因为只有这样,才能得到一个色散更小的慢波结构。例如,在现代卫星通讯中必须要求宽频带,特别是对于多载波工作,除带宽外,还要稳定的增益及管子无失真,这两者与慢波结构的特性有密切关系。因而有必要进一步了解这种慢波结构。其耦合系数可以说明一慢波结构的特性: The bandwidth of 10% or more high-power TWT more and more coupled resonant cavity line. These slow-wave structures have negative chromatic dispersion, work in a space harmonic, because only in this way can we get a smaller dispersion of the slow-wave structure. For example, broadband must be required in modern satellite communications, especially for multi-carrier operation, with the exception of bandwidth, with stable gain and tube-free distortion, both of which are closely related to the characteristics of the slow-wave structure. It is necessary to further understand this slow-wave structure. Its coupling coefficient can explain the characteristic of a slow wave structure: