SUBSTITUTION OF RESEARCH ON ANTENNA SYSTEMS IN SHORTWAVE AND ULTRASHORTWAVE RANGES

Abstract

To improve the short-wave antenna based on low-positioned vibrators, an analysis of current trends in the development of new and modernization of existing antenna systems for short-wave radio communications was conducted. The possibility of studying the use of low-positioned horizontal vibrators is due to the fact that it is possible to create rather complex antenna arrays with large gain coefficients from available materials at ionospheric wave antenna sites and not only for them. Approaches to improving antenna systems depending on the type of radio wave propagation, physical parameters of antenna-feeder devices and their directional properties were analyzed. In this regard, an approach to antenna synthesis and the use of this approach in further work to improve the antenna system and obtain the necessary directional characteristics for organizing stable radio communications were substantiated. It is proposed to develop a method of constructive synthesis based on the methods of induced electromotive forces and mirror reflection. At the same time, a set of scientific tasks has been defined to achieve new results, classical mathematical methods have been selected, with the help of which it will be possible to calculate the electromagnetic field created by an improved antenna system. To achieve the set goal, the main directions have been defined, such as: improving the mathematical model of the antenna system based on low-lying radiators; the next step is to improve the mathematical method for calculating the electromagnetic field taking into account the radial components of the electric and magnetic fields; and, as a result, to obtain a convenient tool, to develop a methodology for the constructive synthesis of an improved short-wave antenna system from low-lying radiators with the ability to change the direction of the antenna radiation pattern in the vertical and horizontal planes. The article has formed an objective function that determines the main parameters that need to be achieved. Controlled and uncontrolled variables have been determined, on which the objective function of the specified process directly depends. In conclusion, an approach to calculating the efficiency indicator for evaluating the obtained parameter value from their previous values is presented.