Application of Electrodynamic Admittances in the TWT Theory

Abstract

Unlike the conventional transmission lines and waveguides, in which, as a rule, the wave propagates only in one region, in slow-wave structures (SWSs) with the electron beam (e-beam) the wave propagates or concentrates at least in three regions. Besides, in the most cases slow waves are represented by components of the E- and H-waves, each of them with different boundary conditions. This doubles the number of the boundary conditions, which achieves 16 for two regions SWSs plus 4 boundary conditions for the e-beam.