In this paper, a theoretical analysis of a dielectric-loaded coupler based on the transmission line model is proposed. One of the major challenges in the design of dielectric-loaded accelerating (DLA) structures is the proper coupling of high-power RF into the dielectric-loaded tube. The considered X-band coupler consists of a tapered dielectric-loaded tube converting TM 01 mode in a conventional circular waveguide to the one in a uniform dielectric-loaded tube. To analyze the coupler with an approximation based on the transmission line model, the coupler is divided into a large number of sections in the propagation direction. Every section is considered as a short-length uniform transmission line with its own characteristic impedance and propagation constant. Then, scattering matrix parameters of the coupler are calculated by the total transmission matrix of the structure. To investigate the accuracy of the proposed method, two coupler prototypes with different dielect...

中文翻译：

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加速结构中使用的介质加载耦合器电磁分析的近似方法

本文提出了基于传输线模型的介电耦合器的理论分析。设计介电负载加速（DLA）结构的主要挑战之一是将高功率RF正确耦合到介电负载管中。所考虑的X波段耦合器由一个锥形介质加载管组成，该管将常规圆形波导中的TM 01模式转换为均匀介质加载管中的一个。为了基于传输线模型对耦合器进行近似分析，将耦合器在传播方向上划分为多个部分。每个部分都被视为具有其自身的特征阻抗和传播常数的短长度均匀传输线。然后，耦合器的散射矩阵参数由结构的总透射矩阵计算得出。为了研究所提出方法的准确性，使用了两个具有不同介电常数的耦合器原型。