Ⅰ、引言低噪声行波管的设计被很多影响它性能的变量弄复杂了。低噪声管设计的一般方法是用与具有任何一点改进的经验结论相结合的基本噪声理论来进行粗略的设计计算。另外,为了得到近似的设计,以一个已知的设计为基础的频率缩尺定律是十分有用的方法。本文目的是总结出一个有效的简捷设计方法,使得低噪声 I. INTRODUCTION The design of low-noise TWTs is complicated by many variables that affect its performance. The general approach to designing a low-noise tube is to make a rough design calculation using the basic noise theory combined with any little improvement in empirical conclusions. In addition, the frequency scaling rule based on a known design is a very useful way to get an approximation of the design. The purpose of this paper is to summarize an efficient and simple method of design that allows for low noise