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Information × Registration Number 0225U000992, (0120U100980) , R & D reports Title New theoretical and experimental methods in electrodynamical modeling, electromagnetic wave generation and radiation in the gigahertz and terahertz frequency regions. (Cipher: «Старт-5») popup.stage_title Нові теоретичні та експериментальні методи в електродинамічному моделюванні, генерації та випромінюванні електромагнітних хвиль гігагерцового та терагерцового діапазонів частот Head Petro M. Melezhyk, Доктор фізико-математичних наук Registration Date 22-01-2025 Organization O. Ya. Usikov Institute for Radiophysics and Electronics NAS of Ukraine popup.description1 Development of new theoretical and experimental methods of electrodynamical modeling of laws and phenomena inherent in gigahertz and terahertz electromagnetic wave diffraction, propagation, absorption, scattering, transformation, and channeling taking place in open resonant structures and stratified nonlinear dielectric layers, diagram-forming thin graphene-like coats and micro- and nanoantennas with complex-shape patches, in open double-comb resonators with strip electron flows and in leaking-wave resonators; in spherical-mirror open resonators with nanoparticles, in metamaterials, in nonlinear media and superdimensional waveguide structures; in open resonant systems with spatially developed electron beams and 3-D frequency-selective structures, with making on this basis laboratory models of vacuum electromagnetic wave radiation sources and general-purpose devices in the gigahertz and terahertz wave regions. popup.description2 New theoretical and experimental methods for the study of the processes of subterahertz and terahertz radiation interaction with wide class of open composite electrodynamic structures, including structures with ferromagnets, metamaterials, and graphene have been developed. Laboratory setups of compact oscillators, power combiners and devices for channeling and radiation of electromagnetic waves have been created. Designs of new metal mesh filters are proposed. A method of semi-infinite slow wave systems analysis has been developed. A technique for determining the dielectric permittivity of a nonhomogeneous plate in a waveguide of arbitrary cross-section has been created. Three groups of eigenoscillations (forward, backward, and hybrid) were found in the frequency vicinity close to the cutoff frequency of spin oscillations for the ferromagnet inhomogeneous layer with periodic grating at one of its boundaries and a graphene on other. The regularities and conditions for the existence of the regimes of high and extremely high coherent Vavilov-Cherenkov and Smith-Purcell radiation have been determined and classified. New designs of multiband polarization plane rotators and circular polarization dividers are proposed. A resonant method of a complex dielectric permittivity measuring has been developed in the microwave range for the solid dielectrics. A non-contact radiophysical method of studying a quantum phenomena in solids at low temperatures using high-Q whispering gallery modes of the disk dielectric resonators as a resonant cell has been developed. Designs of compact wideband low-voltage subterahertz and terahertz vacuum electron devices with oversized electrodynamic structures with increased electron beam-wave interaction efficiency are proposed. A scientific and technical base for the creation of effective power combiners in the short-wave part of the VHF range has been developed based on open resonator systems.  Product Description popup.authors Ivanchenko Ihor V. Ivanchenko Denys I. Ilienko Kostiantyn V. Abramovich Valentyna I. Blinnikova Olha A. Brovenko Andrii V. Vlasenko Serhii O. Voitovych Oleh A. Volf Nina M. Holovashchenko Roman V. Derkach Vadym M. Zavertannyi Viktor V. Kyrylenko Anatolii O. Kyshko Serhii O. Kovshov Yurii S. Kozhushko Vasyl V. Kuzmichova N. A. Kuzmychov Ihor K. Kulieshov Oleksii M. Kulyk Dmytro Yu. Kurin Viacheslav H. Lievashova H. S. Likhachov Oleksandr O. Loian A. V. Lukash O. S. Miroshnichenko Volodymyr S. Mospan Liudmyla P. Muzychyshyn Bohdan I. Nakhimovych Marks I. Ostryzhnyi Yevhenii M. Perov Andrii O. Poiedynchuk Anatolii Yu. Ponomarenko Serhii S. Popenko Nina O. Popkov Oleksii Yu. Sviezhentsev Oleksandr Ye. Senkevych Olena B. Steshenko Serhii O. Tarapov Serhii I. Troshchylo Oleksandr S. Khyzhniak Ivan A. Khruslov Maksym М. Khutorian Eduard M. Churiumov Henadii I. Shevchenko Anatolii M. Shendrik Serhii M. Shulika Olha V. Yashyna Natalia P. popup.nrat_date 2025-01-22 Close