Mykhalchuk I. Compact antennas in radiomonitoring systems with primary signal processing

The dissertation is aimed at solving the problem of increasing the efficiency of using antennas in mobile radio monitoring systems by using low - element antenna arrays with advanced capabilities. When monitoring the electromagnetic environment of radio control stations use a significant number of antennas, each of which performs only its inherent function. In the case of mobile radio monitoring systems, it is necessary to limit the number of antennas, as such systems are placed on cars and therefore there is a need to use multifunction antennas. Combining most functions in one antenna system not only simplifies the placement of antennas on mobile radio control stations, but also increases the accuracy of measurements. For the first time, mathematical relations for the radiation fields of a wire spiral are derived in this work, which make it possible to investigate the peculiarities of the field distribution in space. A mathematical model for current turns with a standing current wave is described, which describes previously known field distributions. For the first time, the variants of antenna systems synthesis were proposed, which would combine the possibilities of isolating the necessary radiation in an unfavorable electromagnetic environment, creating an electrical signal with the intensity required to identify the radiation source; suppression of interference acting at a frequency close to the frequency required to observe the radiation, measure the angular position of the radiation source and the vector of the electric field strength. Such antenna systems can be systems consisting of several emitters. Lattices with linear antenna elements are proposed, which make it possible to carry out direction finding, measure the polarization parameters of the signal, suppress interference at close frequency, calculate the modulus of the electric field vector and determine the direction of wave arrival. Lattices with annular elements are also considered, which allow not only to perform all these functions, but also to measure the parameters of the electromagnetic field in a circular orthogonal polarization basis and to distinguish the waves of right and left rotation of the electric field vector.