Abstract
Resistive-loaded dipoles of various lengths, for different frequency ranges, are widely used in GPR suvey of subsurface ground structures. At the same time, in most cases, a transmitter with a fixed pulse length is used, which does not always allow you to fully use the characteristics of the antenna. Directional antennas for high-power georadars with amplitudes of the generated signal of 5 kV and higher are considered. A method of matching a directional resistively loaded antenna with a transmitter, implemented using a gas-filled spark gap, is proposed, while some elements are transferred from the transmitter to the antenna and resistors of a resistively loaded dipole are part of a pulse generator. As a result, the antenna is aligned with the pulse duration and produces more efficient electromagnetic wave radiation. Also, the antenna design allows you to select the necessary directional pattern by selecting either the maximum of the main lobe, or maximize the side lobes. The use of a metal shield reduces the emission of electromagnetic radiation to the operator of the georadar, and may allow to increase the radiated power of classical georadars and, consequently, increase their dynamic range.
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