ABSTRACT
Analytical investigations of the transient behavior of electromagnetic waves in waveguides have a long history when considering only empty waveguides with conductive walls [1–4]. In these early works, straight waveguides were considered in which the phenomenon is described by a 1D equation in the time or frequency domain because the transverse field components are determined via the longitudinal ones in the general formulation. Using a Fourier integral transform, some aspects of the general nature of transient propagation were investigated. It was shown that the normal steady-state structure does not exist in the transient phase since the different field components propagate in a non-identical manner that is characterized by the group velocity.
