Branch-guide energy couplers can be used in the terahertz relativistic sheet electron beam traveling wave tubes (THz-RSBTWT) for high and high frequency microwave radiations. To analyze this type of coupler, a new method based on the phase superposition principle was put forward in this paper. A physical model was developed, which is applicable no matter the coupler width is large or small. The general distance relationship between the branches was derived and a rapid design formula was obtained, which can help design energy coupler with arbitrary coupling coefficient.

中文翻译：

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宽带宽太赫兹相对论性片状电子束行波管支导能量耦合器的理论研究

分支引导能量耦合器可用于太赫兹相对论片电子束行波管 (THz-RSBTWT)，用于高频和高频微波辐射。为分析这类耦合器，本文提出了一种基于相位叠加原理的新方法。开发了一个物理模型，无论耦合器的宽度是大是小，它都适用。推导出了分支之间的一般距离关系，得到了快速设计公式，可以帮助设计任意耦合系数的能量耦合器。