ANALYSIS OF THE EFFECT OF THE GEOMETRIC STRUCTURE OF THE EMITTERS ON THE ELECTRIC PARAMETERS OF THE LOGO-PERIODIC ANTENNAS
The wide practical use of log-periodic antennas, including those in the decameter range, is due to the constancy of their electrical parameters in a fairly wide frequency range. Structurally, a log-periodic antenna is a complex structure consisting of a symmetrical two or four-wire collecting line, to which radiators of the same type are connected in a cross order. In this case, operation in a wide wavelength range for log-periodic antennas is achieved due to the fact that not identical in size, but geometrically similar antenna elements are used as vibrators for log-periodic antennas. And since the average statistical parameters of log-periodic antennas depend on the structure of the emitters, the task of the study is to substantiate recommendations for choosing the structure of their emitters, which will just provide the range properties of antenna systems. The article presents the results obtained on the basis of modeling in the MMANA-GAL environment the electrical parameters of wide-range log-periodic antennas of the decameter range with different shapes of radiating elements. Methods for constructing periodic structures of flat log-periodic antennas are considered. The interrelation of their structural elements, which determine the properties of wide-range operation, is shown. The dependences of the electrical parameters of inclined log-periodic antennas on the structural differences of their radiating elements are investigated. The conditions for the use of vibrator and frame emitters are substantiated while maintaining the range properties of the log-periodic structure.