An overview of impulse radar phenomenon

In the ideal situation, impulse radar has a fractional bandwidth of one, allowing it to combine low frequency with wide bandwidth giving at once high resolution and the ability to penetrate lossy materials. After having presented a theoretical definition of impulse radar, the author presents an overview of some issues concerning impulse waveforms on materials. An attempt is made to analyze such phenomenon as molecular relaxation, signal precursor effects, self-induced transparency, the natural resonance theory, out-of-band effects and the singularity expansion method