Propagation of Powerful Nano- and Subnanosecond Video Pulses in a Medium with Various Thermodynamic Characteristics

A conservative model is proposed for a weakly conductive material medium with changing thermodynamic characteristics during the propagation of a pulse in it. Equations are obtained that describe the change in the shape of the profile of a video pulse propagating in a medium, as well as in nonlinear transmission lines with a temperature dependence of the permittivity. It is shown that if the temperature coefficient of the permittivity is negative, then the peak power of the pulse can increase with time; otherwise, the temperature dependence of the permittivity leads to an increase in attenuation.