Pulse propagation in lossy media using the low-frequency window for video pulse radar application

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Abstract
Pulse propagation in lossy media is considered. The frequency band is selected to lie in the low-frequency window (LFW) as defined by Gabbilard et al [5]. The antennas chosen are finite-length dipoles in electrical contact with the lossy media. The input impedance of these dipoles is observed to be approximately a constant resistance over the wide frequency band of interest thus making a broad-band match practical. It is shown that when propagation is in the LFW the input pulse propagates over distances of many kilometers with little distortion. Attenuation data ate presented as universal curves for the pulse amplitude generated at the terminals of a parallel receiving dipole immersed in the same-medium. The original application of these results is the evaluation of the limitations imposed by propagation losses and dispersion of broad-band video pulse-radar systems for deep probing in the earth. A potential video pulse-radar system for deep probing is discussed.