Dielectric loss analysis of anisotropically conducting tape helix slow wave Structure in travelling wave tube

This paper presents the analysis of dielectric losses obtained through the coldwave field analysis of anisotropically conducting tape helix supported by lossy dielectric rods in travelling wave tubes (TWT). The electromagnetic field expressions are derived through field approach using Maxwell's equations and vector Helmholtz's equations by solving the complex constants through boundary conditions. Through the application of lossy dielectric permittivity in the resultant axial electric field, the shunt capacitance and the shunt conductance per unit length are obtained. The presence of lossy dielectric support rods in the slow wave structure (SWS) results in attenuation of the propagating electromagnetic wave. The attenuation constant obtained through the present analysis has been compared with the published models and experimental results. The effect of the frequency and temperature is also studied for X-Ku band and Q- band travelling wave tube amplifiers.