The paper describes the main requirements for antenna systems operating in modern ultra-wideband radio communication networks, considers the main advantages and features of a rib-rod emitter, and justifies the choice of such an emitter as an object of research. Analytical expressions of the main electrodynamic characteristics are described, on the basis of which a mathematical model of a rib-rod emitter is compiled, which is necessary for the synthesis of a computer model with characteristics as close as possible to the real emitter. The method of synthesis of antenna structures without the use of full-scale modeling is selected and justified. An improvement of the emitter supply line is developed, which consists in using a regular coaxial line for the place of the waveguide channel, which greatly simplifies the use of several such emitters in the antenna array, and makes it possible to operate one emitter in two polarizations. Based on the obtained mathematical model, the optimal geometric dimensions of the emitter for the selected frequency range were calculated and computer simulations were performed to determine the optimal electrodynamic characteristics of this type of emitter, providing stable and maximum permissible coverage for operation in the frequency range of fifth-generation networks. The analysis of the simulation results is carried out, the simulation of the channel operation is carried out, according to the results of which it can be concluded that this type of emitter, when used as part of more complex antenna structures and with appropriate modifications, can be used in networks deployed according to the fifth generation standard, as well as in older generation networks, provided that the geometric dimensions of the antenna are improved. The result of this work is a designed model of a rib-rod emitter that is fully suitable for use in antenna structures operating in 5G networks.

The synthesis of a cylindrical antenna array for ground-based mobile weather monitoring complexes, based on quadrifilar radiators, is considered. The basic mathematical expressions for determining the electrodynamic characteristics of both the radiator from the antenna array and the AA itself are presented. Various phenomenological models of these radiators are considered. The approach to the synthesis of phenomenological models of the radiator and antenna array as a whole is described. The results of such synthesis are given, and the main characteristics and values of DG, CG, SWR, RP for the given type of radiator and AA in the corresponding frequency range are obtained. Techniques for using phenomenological models for operational synthesis of electrodynamic structures such as cylindrical AA and quadrifilar radiator are developed and described in detail. The possibility of applying this approach to the synthesis of this type of structures for radar weather monitoring systems is shown.