Analysis of Dispersion Characteristics of Helix Slow-wave Structures for Broadband Traveling Wave Tubes with Exact Floquet Approach

Abstract

In this research paper, it is presented a different analysis method, which is called as Exact Floquet Approach (EFA), used in controlling dispersion characteristics of loaded helix Slow- Wave Structures (SWSs) for Traveling Wave Tubes (TWTs). In this context, this study can be expressed with three main parts. Firstly, EFA is introduced for dispersion analysis of the helix SWSs. Secondly, normalized phase velocities of several helix SWSs such as rectangular, circular and T shape dielectric support rods given in open literature are determined in order to test the validity of the method. Furthermore, dielectric and metal segment loaded helix SWS is also considered for investigating dispersion characteristic with EFA. Lastly, All interested helix SWSs are modeled in Computer Simulation Technology (CST) Microwave Studio design environment and obtained results are compared with the presented methods. Moreover, the proposed method is compared with reported theoretical and experimental results. It is noted that the method of EFA is in good agreement with the reported works and CST. EFA can be a fast and alternative method to the avaiable methods in the literature for the dispersion analysis of helix SWSs.