Наукові видання (ШІ)
Permanent URI for this collectionhttps://devessuir.sumdu.edu.ua/handle/123456789/137
Browse
2 results
Search Results
Item Compact 2-step Septulum Polarization Converters for Radars and Satellite Systems(Advanced Electromagnetics, 2022) Piltyay, S.; Bulashenko, A.; Fesyuk, I.; Bulashenko, O.This article presents the results of analysis, numerical simulations and optimization of new narrowband guide septulum polarization converters. Orthomode duplexers and polarization converter designs based on septulums are widely used in modern microwave systems with orthogonal circularly polarized signals. Septulum guide polarizer is an effective compact device, which transforms right-hand circularly polarized (RHCP) and left-hand circularly polarized (LHCP) electromagnetic modes into linearly polarized ones. At the same time, it divides RHCP and LHCP modes and directs them to two different rectangular guides with high signal discrimination to each other. Thus, a septulum-based guide device integrates performance of a polarization transformer and of an orthomode duplexer. The main electromagnetic characteristics of the suggested polarization converter were simulated using the finite elements method. The proposed design of a compact narrowband guide polarization converter has a septulum with two steps. Several designs of septulum polarization converters were developed and compared for different relative bandwidths of 5%, 10%, and 15%. The comparative investigation of the obtained designs was carried out. Main electromagnetic characteristics of optimal septulum polarization converters were modeled and compared in considered fractional bandwidths. These include reflection coefficients, cross-polarization discrimination, ellipticity parameter, and ports discrimination. Developed compact septulum polarization converters can be applied in modern antenna systems for radars and satellite communication systems.Item Comparative Analysis of Compact SatellitePolarizers Based on a Guide with Diaphragms(Advance Electromagnetics, 2021) Piltyay, S.; Bulashenko, A.; Fesyuk, I.; Bulashenko, O.V.In this article we carry out the comparative analysis of new compact satellite polarisers based on a square guide with diaphragms. The main electromagnetic parameters of the developed microwave guide devices with various amount of diaphragms were obtained within the satellite frequency interval from 10.7 GHz to 12.75 GHz. Waveguide polarization converters with different amount of diaphragms from 2 to 5 have been designed and optimized. The main parameters of the presented polarizer were calculated applying the numerical method of finite integration in the frequency domain. Optimization of the electromagnetic parameters of the developed waveguide devices was carried out using the software CST Microwave Studio. As a result, sizes of the device designs have been optimized for the provision of improved polarization and phase parameters. The performed analysis showed that a waveguide polarizer with five diaphragms has the best electromagnetic parameters. The developed compact polarizer with five diaphragms based on a square guide provides a minimum deviation of the output phase difference from 90 degrees and high level of isolation between linear polarization over the entire operating frequency range. Presented in the article compact waveguide polarization converters can be applied in satellite systems, which require efficient polarization separation of signals.