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Radar remote sensing methods for exploration of diferent dielectric media may be highly efficient for obtaining the necessary information on media properties. In many practical cases, the operation of such systems is carried out either directly on the surface of investigated media or for elevated antennas at some height (comparable with the wavelength) above the surface. In these cases, it is necessary to take into account the influence of dielectric properties of the medium on the impedance characteristics of transmit-receive antennas. In the paper, the results of theoretical and experimental investigations concerning the influence of the dielectric properties on parameters of dipole antennas situated near the surface are analysed. A possibility to determine the dielectric medium properties by means of a two-dipole antenna system is evaluated.

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The dependence of an input impedance of an ultrahigh-frequency linear antenna on the height above a three-layer medium is investigated experimentally and theoretically.