Feasibility study of a HF antenna with elliptical polarization used for telegraphic transmission with very high speed

The design of an HF antenna radiating, in a given direction, a wave with elliptical or circular polarization was considered. The radiating system consists of two intersecting half-wave dipoles with an angle 2 beta between them, and located in a plane inclined at an angle alpha to the vertical. The effect of the finite permittivity of the ground on the directivity diagram was analyzed, and the gain was computed with the type of polarization considered. The feasibility of obtaining an elliptical polarization with a fixed vector orientation was then studied as a function of the current fed to each dipole. Finally, a numerical application was presented for a frequency of 10 MHz, including the computation of the soil coupling impedances.