NUMERICAL SIMULATION OF UWB ELECTROMAGNETIC PULSES PROPAGATION IN DISPERSIVE ELECTRODYNAMIC LINES

摘要

The technique of wideband and ultrawideband (UWB) electromagnetic pulses is relatively new and very fast developed branch of the electrodynamics and the microwave electronics. These pulses may be useful for new radars, digital telecommunications with high data transfer rates, etc. The principal direction of the radio and electronics engineering development is replacement of frequency-localized (quasi-harmonic) signals by time-localized UWB pulses. As a result, the general principles of an electronic radio equipment construction that have been formulated by Hertz, Popov, Marconi et al. are obsolescent to a certain extent and are renewed. Naturally, new engineering solutions can be based only on advanced mathematical methods. These are enough topical to-day for the electrodynamics as well as for the radio engineering. However, the modern computer simulations and design of the UWB circuits are founded mainly on the FDTD (FETD) or the FDFD (FEFD) methods. The reason is that the most of known analytical approaches to solving of the field equations was developed in the middle of the previous century exclusively for narrowband (quasi-harmonic) electromagnetic fields. Taking into account excessive "computer laboriousness" of the field equations direct solving, new theoretical approaches to the UWB pulse fields evaluation are wanted.