A transient analysis of the electromagnetic field by our new numerical method is shown to be useful for understanding the mechanism by which the electromagnetic field at the stationary state in the waveguide having the H-corner are brought about.

A transient analysis of the electromagnetic field by our new numerical method has been shown to be useful for obtaining the physical meaning of the characteristics of the component of the microwave circuit. In this communication, the transient variation of the field distribution in the waveguide having the tuning window is brought about.

The Bergeron's method is presented for the numerical transient analysis of the electromagnetic fields. The method is available for the problem containing both the dispersive media and the complicated geometries of boundary. The formulation of the method is briefly introduced. Numerical evaluations of the formula are given as an example for the cold plasma radiated by an cylindrical reflector, and some interesting results are illustrated to show the electric field variation caused by dispersion and reflection on the space-time domain.