Local Multipoint Distribution Service (LMDS) is a broadband microwave communications technology offering a low-cost and multifunctional solution for terminal access applications. This paper develops a rectangular waveguide-based duplexer with a square-ridge T-junction for LMDS. The design of a rectangular waveguide-based metal diaphragm filter in the E-plane is described. The metal diaphragm of this filter can be processed using methods such as etching, ensuring high precision and low cost. The characteristics of a rectangular waveguide-based T-junction in the H-plane used in the duplexer are analyzed.

Keywords: microwave duplexer, E-plane metal diaphragm, microwave filter, ribbed T-junction, local multi-drop distribution service

The article considers the solution of the problem of making managerial decisions when performing special aviation operations in emergency situations caused by landscape fires. In order to improve management decision-making, the optimal use of meteorological information by decision makers is considered. The probability of performing special aviation work is used as a criterion for choosing the optimal solution. The objective function is represented by the number of formulations of weather forecast phases, the probabilities of weather forecast formulations, and the probability of performing special aviation operations during the corresponding weather phase. The sensitivity of the mathematical model of the control problem is analyzed for various input parameters, and the characteristic dependence of the values of the objective function on the number of elementary periods is presented. The results obtained are proposed to be used in the planning and organization of aviation flights when performing special aviation operations in emergency situations during the elimination of landscape fires.

Keywords: management, meteorological information, objective function, dynamic programming, special aviation operations, aircraft