Investigation of Overmoded Brewster Window for Terahertz Traveling Wave Tube

In this paper, the overmoded Brewster window for terahertz traveling wave tube is investigated, and good transmission characteristics are achieved in the frequency range of 0.9-1.1 THz. In order to analyze the influence of fabrication and assembly errors on the transmission, the model is simulated with different conditions of the thickness and the tilted angle of the window slice. The simulation results show that it is able to achieve good transmission characteristics with tilted angle error within
$\pm 2^{\mathrm{o}}$
and thickness error within
$\boldsymbol{\pm 0.01}$
mm. Thus, the overmoded Brewster window has some tolerance for dimensional errors and is suitable for practical engineering applications.