Pub Date : 2023-03-28DOI: 10.30837/rt.2023.1.212.09
G. Komarova
This work presents the analysis of the integral equation of macroscopic electrodynamics, the solution of the problem of diffraction of a plane polarized electromagnetic wave on a system consisting of two ferrite cylinders of radii corresponding to spatial resonance (R ≤ 0.1∙ λo, λо is the wavelength in free space ). The electromagnetic fields inside the first (second) cylinder are presented as the sum of the fields of the solitary first (second) cylinder, a plane-parallel wave falls on it and is scattered by the second (first) solitary cylinder. The expressions for the fields satisfy Maxwell's equations, boundary conditions for two cylinders, and integral equations. The influence of the distance between the centers of the cylinders on the strength of the electromagnetic field in the middle of the ferrite cylinders has been studied. It has been established that in a system consisting of two cylinders, a group resonance arises due to their mutual arrangement in space. The transformation of microwave energy on a system consisting of two ferrite cylinders depending on the value of their resonant radii at ferrimagnetic resonance has been studied. An inhomogeneous electromagnetic wave created by propagating in free space with a power flux density of 622 kW/m2 and a length of 3.2 cm reflected from a metal screen acts on a system of ferrite cylinders, the total length of which is 1.28 m, and the resonant radius is 3.863 mm with a force equal to 4 N. The results of studying the phenomenon of diffraction on a system consisting of two ferrite cylinders show that the total force with which the inhomogeneity of a standing electromagnetic wave acts on two cylinders is 2.8 times greater than the force acting on a solitary cylinder.
{"title":"Influence of ferrimagnetic resonance on conversion of electromagnetic energy by a system consisting of two cylinders into a mechanical one","authors":"G. Komarova","doi":"10.30837/rt.2023.1.212.09","DOIUrl":"https://doi.org/10.30837/rt.2023.1.212.09","url":null,"abstract":"This work presents the analysis of the integral equation of macroscopic electrodynamics, the solution of the problem of diffraction of a plane polarized electromagnetic wave on a system consisting of two ferrite cylinders of radii corresponding to spatial resonance (R ≤ 0.1∙ λo, λо is the wavelength in free space ). The electromagnetic fields inside the first (second) cylinder are presented as the sum of the fields of the solitary first (second) cylinder, a plane-parallel wave falls on it and is scattered by the second (first) solitary cylinder. The expressions for the fields satisfy Maxwell's equations, boundary conditions for two cylinders, and integral equations. The influence of the distance between the centers of the cylinders on the strength of the electromagnetic field in the middle of the ferrite cylinders has been studied. It has been established that in a system consisting of two cylinders, a group resonance arises due to their mutual arrangement in space. The transformation of microwave energy on a system consisting of two ferrite cylinders depending on the value of their resonant radii at ferrimagnetic resonance has been studied. An inhomogeneous electromagnetic wave created by propagating in free space with a power flux density of 622 kW/m2 and a length of 3.2 cm reflected from a metal screen acts on a system of ferrite cylinders, the total length of which is 1.28 m, and the resonant radius is 3.863 mm with a force equal to 4 N. The results of studying the phenomenon of diffraction on a system consisting of two ferrite cylinders show that the total force with which the inhomogeneity of a standing electromagnetic wave acts on two cylinders is 2.8 times greater than the force acting on a solitary cylinder.","PeriodicalId":41675,"journal":{"name":"Visnyk NTUU KPI Seriia-Radiotekhnika Radioaparatobuduvannia","volume":"50 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79939040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-28DOI: 10.30837/rt.2023.1.212.14
V. Zhyrnov, S. Solonska
The results of developing an intelligent model of radar object images for surveillance radars are presented. The relevance of this work deals with the development of algorithm for automatic processing images of radar objects that provide effective detection of weak true signals due to the accumulation of signal and logical information in the analyzed cell and in its surroundings under interferences. The improvement of air safety tools and the automation of air traffic management processes require effective procedures to process signal information. The issues of more complete use and qualitative improvement of the information-processing capabilities of control systems are also topical, especially in difficult conditions of interfering signals. The basis of this study is the idea of using an intellectual model of radar object images for automatic decision-making on detection and recognition of radar objects, built on the space of semantic features. The main result is optical object recognition, similar to how an expert can easily recognize aerial objects and their types when viewing radar object images. Based on semantic features intelligent model of radar object images has been developed, which makes it possible to effectively detect and classify aerial objects. It is worth noting that the characteristic description of intelligent model of radar object images for point, extended, moving and stationary radar objects is the mathematical description of procedures and relationships at perception and analysis of signals in the form of distinguishing features or properties. As a result, various virtual images of radar object are generated in the form of spatial-semantic and spectral-semantic models. The main features and structural elements of the model are given. It is shown that the advantages of this model are related to the possibility of characteristic description of the radar object images using the algebra of finite predicates.
{"title":"Intelligent model of radar object images for surveillance radars","authors":"V. Zhyrnov, S. Solonska","doi":"10.30837/rt.2023.1.212.14","DOIUrl":"https://doi.org/10.30837/rt.2023.1.212.14","url":null,"abstract":"The results of developing an intelligent model of radar object images for surveillance radars are presented. The relevance of this work deals with the development of algorithm for automatic processing images of radar objects that provide effective detection of weak true signals due to the accumulation of signal and logical information in the analyzed cell and in its surroundings under interferences. The improvement of air safety tools and the automation of air traffic management processes require effective procedures to process signal information. The issues of more complete use and qualitative improvement of the information-processing capabilities of control systems are also topical, especially in difficult conditions of interfering signals. The basis of this study is the idea of using an intellectual model of radar object images for automatic decision-making on detection and recognition of radar objects, built on the space of semantic features. The main result is optical object recognition, similar to how an expert can easily recognize aerial objects and their types when viewing radar object images. Based on semantic features intelligent model of radar object images has been developed, which makes it possible to effectively detect and classify aerial objects. It is worth noting that the characteristic description of intelligent model of radar object images for point, extended, moving and stationary radar objects is the mathematical description of procedures and relationships at perception and analysis of signals in the form of distinguishing features or properties. As a result, various virtual images of radar object are generated in the form of spatial-semantic and spectral-semantic models. The main features and structural elements of the model are given. It is shown that the advantages of this model are related to the possibility of characteristic description of the radar object images using the algebra of finite predicates.","PeriodicalId":41675,"journal":{"name":"Visnyk NTUU KPI Seriia-Radiotekhnika Radioaparatobuduvannia","volume":"5 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82502330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-28DOI: 10.30837/rt.2023.1.212.12
V.G. Krizhanovski
An analysis of the current state of power generators of the class E family was carried out. They include classes: inverse E (E-1), with an injection of harmonics – class EM, hybrid classes E/Fn and EFn, including those built based on an active distributed transformer scheme. New developments of such oscillators over the past five years are considered. Significant progress has been made in the development of new feedback schemes. The study of oscillator schemes with power summation and the use of synchronized oscillators is considered. In connection with the appearance of new active devices, circuits using additional active elements – drivers of powerful transistors and the use of two-stroke circuits for the construction of a class E oscillator key are spreading. The proposed classification of oscillators is based on the principle of building an output circuit and a feedback circuit, the morphological table of types is constructed class E oscillators. The principles of operation and characteristics of some new schemes of class E oscillators and their parameters are considered. The trends in the development of class E generators are determined, the main of which is the design of generators for operation in radio engineering systems and matching their parameters with the needs of such systems, as well as in systems of power (industrial) electronics, wireless energy transmission, biomedical and information systems. This is done in accordance with the trend of increasing the oscillator signal parameters while maintaining high efficiency. The variety of power levels, frequencies, and type of performance of class E oscillators is preserved and expanded, in the form of integrated circuits, which allows increasing the parameters of transmitters, sensors, and systems of compatible energy and information transmission.
{"title":"Current state and development trends of class E oscillators: an overview","authors":"V.G. Krizhanovski","doi":"10.30837/rt.2023.1.212.12","DOIUrl":"https://doi.org/10.30837/rt.2023.1.212.12","url":null,"abstract":"An analysis of the current state of power generators of the class E family was carried out. They include classes: inverse E (E-1), with an injection of harmonics – class EM, hybrid classes E/Fn and EFn, including those built based on an active distributed transformer scheme. New developments of such oscillators over the past five years are considered. Significant progress has been made in the development of new feedback schemes. The study of oscillator schemes with power summation and the use of synchronized oscillators is considered. In connection with the appearance of new active devices, circuits using additional active elements – drivers of powerful transistors and the use of two-stroke circuits for the construction of a class E oscillator key are spreading. The proposed classification of oscillators is based on the principle of building an output circuit and a feedback circuit, the morphological table of types is constructed class E oscillators. The principles of operation and characteristics of some new schemes of class E oscillators and their parameters are considered. The trends in the development of class E generators are determined, the main of which is the design of generators for operation in radio engineering systems and matching their parameters with the needs of such systems, as well as in systems of power (industrial) electronics, wireless energy transmission, biomedical and information systems. This is done in accordance with the trend of increasing the oscillator signal parameters while maintaining high efficiency. The variety of power levels, frequencies, and type of performance of class E oscillators is preserved and expanded, in the form of integrated circuits, which allows increasing the parameters of transmitters, sensors, and systems of compatible energy and information transmission.","PeriodicalId":41675,"journal":{"name":"Visnyk NTUU KPI Seriia-Radiotekhnika Radioaparatobuduvannia","volume":"102 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77076633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-28DOI: 10.30837/rt.2023.1.212.16
V.A. Tikhonov, A.V. Kartashov
Stations of radio-acoustic sounding of the atmosphere are a promising means of obtaining information about the altitudinal distribution of meteorological parameters in the Earth's atmosphere used in the process of solving current scientific and applied tasks to ensure aircraft flights, weather forecasting, etc. However, the effectiveness of the existing radio-acoustic means is insufficient, and there are practical needs for development of appropriate prospective structures and algorithms, which will be implemented when constructing specific stations designed to solve actual applied tasks. The article presents a synthesis of the structural diagram of a promising radio-acoustic measuring complex (RAVC) and a complex algorithm of its functioning. It is shown that the process of the RAVC development can be reduced to the development of independent issues. They are as follows: synthesis (selection) of types of sounding radio and acoustic signals, their energy parameters, synthesis of spatial and temporal signal processing algorithms for optimal selection of useful information from signals received against a background of noise, development of complex management algorithms and complex adaptation to external conditions formed by the external environment, as well as development of technical means intended for the implementation of the specified algorithms. According to this task of synthesis (selection) of sounding signals for radio-acoustic systems of sounding the atmosphere in the design process, it should be a joint study of the characteristics and selection of two interdependent types of signals – electromagnetic and acoustic.
{"title":"Synthesis of a complex algorithm for the operation of a radio-acoustic measuring complex","authors":"V.A. Tikhonov, A.V. Kartashov","doi":"10.30837/rt.2023.1.212.16","DOIUrl":"https://doi.org/10.30837/rt.2023.1.212.16","url":null,"abstract":"Stations of radio-acoustic sounding of the atmosphere are a promising means of obtaining information about the altitudinal distribution of meteorological parameters in the Earth's atmosphere used in the process of solving current scientific and applied tasks to ensure aircraft flights, weather forecasting, etc. However, the effectiveness of the existing radio-acoustic means is insufficient, and there are practical needs for development of appropriate prospective structures and algorithms, which will be implemented when constructing specific stations designed to solve actual applied tasks. \u0000The article presents a synthesis of the structural diagram of a promising radio-acoustic measuring complex (RAVC) and a complex algorithm of its functioning. It is shown that the process of the RAVC development can be reduced to the development of independent issues. They are as follows: synthesis (selection) of types of sounding radio and acoustic signals, their energy parameters, synthesis of spatial and temporal signal processing algorithms for optimal selection of useful information from signals received against a background of noise, development of complex management algorithms and complex adaptation to external conditions formed by the external environment, as well as development of technical means intended for the implementation of the specified algorithms. According to this task of synthesis (selection) of sounding signals for radio-acoustic systems of sounding the atmosphere in the design process, it should be a joint study of the characteristics and selection of two interdependent types of signals – electromagnetic and acoustic.","PeriodicalId":41675,"journal":{"name":"Visnyk NTUU KPI Seriia-Radiotekhnika Radioaparatobuduvannia","volume":"25 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79602793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-28DOI: 10.30837/rt.2023.1.212.17
I.V. Svyd, M. Tkach
The paper considers the features of tracking air objects in existing information networks of radar systems for monitoring airspace. It is shown that the tracking is carried out according to the information of the primary radar surveillance systems, and the secondary radar surveillance systems are used as sources of additional radar information. But the transition to automatic dependent surveillance implies the mandatory use of only request radar surveillance systems. Therefore, the problems of formulating methods and algorithms for tracking air objects based on information from secondary radar surveillance systems are relevant. The specifics of the construction and operation of secondary radar surveillance systems differ significantly from primary radar surveillance systems. The work carried out the synthesis and analysis of the structure of the tracks detector of air objects by interrogating radar systems for monitoring the airspace, namely: a comparative analysis of the quality of identifying the tracks of air objects was carried out; the quality of information support to consumers of the airspace control system with the proposed structure was improved in comparison with the used information processing structure; it is shown that the quality of information support for consumers has more preferable indicators when using the signal processing method during acquisition with subsequent information merging; the influence of the readiness factor of aircraft transponders of interrogative radar systems on the quality of information support for consumers of the airspace control system was evaluated.
{"title":"Synthesis and analysis of the trace detector of air objects of an interrogating radar system","authors":"I.V. Svyd, M. Tkach","doi":"10.30837/rt.2023.1.212.17","DOIUrl":"https://doi.org/10.30837/rt.2023.1.212.17","url":null,"abstract":"The paper considers the features of tracking air objects in existing information networks of radar systems for monitoring airspace. It is shown that the tracking is carried out according to the information of the primary radar surveillance systems, and the secondary radar surveillance systems are used as sources of additional radar information. But the transition to automatic dependent surveillance implies the mandatory use of only request radar surveillance systems. Therefore, the problems of formulating methods and algorithms for tracking air objects based on information from secondary radar surveillance systems are relevant. The specifics of the construction and operation of secondary radar surveillance systems differ significantly from primary radar surveillance systems. The work carried out the synthesis and analysis of the structure of the tracks detector of air objects by interrogating radar systems for monitoring the airspace, namely: a comparative analysis of the quality of identifying the tracks of air objects was carried out; the quality of information support to consumers of the airspace control system with the proposed structure was improved in comparison with the used information processing structure; it is shown that the quality of information support for consumers has more preferable indicators when using the signal processing method during acquisition with subsequent information merging; the influence of the readiness factor of aircraft transponders of interrogative radar systems on the quality of information support for consumers of the airspace control system was evaluated.","PeriodicalId":41675,"journal":{"name":"Visnyk NTUU KPI Seriia-Radiotekhnika Radioaparatobuduvannia","volume":"55 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74176256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-28DOI: 10.30837/rt.2023.1.212.13
O.D. Menyailo, V.G. Mahonin, M.S. Svitlichnyi
The article is devoted to the development and analysis of an avalanche diode generator. The equivalent circuit of the generator is considered and its simplified analysis is carried out. Using the elements of graphic analysis, the conditions of stability of generator oscillations were obtained. The original design of the avalanche diode generator is proposed and considered. A feature of the generator design is the use of a combined oscillating system, which is a three-dimensional resonator in the form of a metal ring made of aluminum alloy placed on a double-sided foil dielectric. Thanks to the top cover made of the same foil dielectric, the oscillating system has a closed nature. The electromagnetic energy supply and output system is made using printed technologies based on a double-sided foil dielectric. The avalanche diode is located in the center of this structure and has a thermal connection with the external radiator. On the one hand, such a decision allowed us to increase significantly the Q-factor of the oscillating system compared to the oscillating system made by the printed method and, at the same time, gave an opportunity to combine the developed auto-generator with other elements of the waveguide path made in the printed version. The developed generator has the possibility of both mechanical, by changing the volume of the resonator with the help of special backlash-free elements, and electronic adjustment, by changing the supply current. The article contains the results of experimental studies of the proposed design of the auto-generator, in particular the dependence of the output power on the frequency of oscillations and on the supply current, as well as the Q factor on the supply current. The research results indicate a fairly high Q-factor of such an oscillating system and, as a result, increased stability of oscillations. In addition, this design to a certain extent improves the overall manufacturability of the design and its material capacity in comparison with the waveguide version.
{"title":"Study of parameters of the avalanche diode generator","authors":"O.D. Menyailo, V.G. Mahonin, M.S. Svitlichnyi","doi":"10.30837/rt.2023.1.212.13","DOIUrl":"https://doi.org/10.30837/rt.2023.1.212.13","url":null,"abstract":"The article is devoted to the development and analysis of an avalanche diode generator. The equivalent circuit of the generator is considered and its simplified analysis is carried out. Using the elements of graphic analysis, the conditions of stability of generator oscillations were obtained. The original design of the avalanche diode generator is proposed and considered. A feature of the generator design is the use of a combined oscillating system, which is a three-dimensional resonator in the form of a metal ring made of aluminum alloy placed on a double-sided foil dielectric. Thanks to the top cover made of the same foil dielectric, the oscillating system has a closed nature. The electromagnetic energy supply and output system is made using printed technologies based on a double-sided foil dielectric. The avalanche diode is located in the center of this structure and has a thermal connection with the external radiator. On the one hand, such a decision allowed us to increase significantly the Q-factor of the oscillating system compared to the oscillating system made by the printed method and, at the same time, gave an opportunity to combine the developed auto-generator with other elements of the waveguide path made in the printed version. The developed generator has the possibility of both mechanical, by changing the volume of the resonator with the help of special backlash-free elements, and electronic adjustment, by changing the supply current. The article contains the results of experimental studies of the proposed design of the auto-generator, in particular the dependence of the output power on the frequency of oscillations and on the supply current, as well as the Q factor on the supply current. The research results indicate a fairly high Q-factor of such an oscillating system and, as a result, increased stability of oscillations. In addition, this design to a certain extent improves the overall manufacturability of the design and its material capacity in comparison with the waveguide version.","PeriodicalId":41675,"journal":{"name":"Visnyk NTUU KPI Seriia-Radiotekhnika Radioaparatobuduvannia","volume":"29 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83406840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-28DOI: 10.30837/rt.2023.1.212.10
V. Borshchov, O. Listratenko, M. Protsenko, I. Tymchuk, O.V. Kravchenko, O.V. Syddia, I.V. Borshchov, M. Slipchenko
Heat-conductive properties of thin heat-conductive polyimide dielectrics have been studied and their thermal resistances have been calculated. Possibility of creating combined printed circuit boards on heat-conductive bases with reduced thermal resistances of polyimide dielectrics from ~ 0.2 to ~ 0.04 °С /W is confirmed. Design parameters and thermal properties of the combined boards with thin polyimide (PI) dielectrics for receivers of concentrated solar radiation are studied. Possibility of providing thermal resistances of PI dielectrics not exceeding 0.43 °С/W has been confirmed. Technical solutions of volumetric light-emitting diode (LED) modules on combined heat-conductive boards, which are 3D-holders-heat sinks, made in the form of single heat-conductive light-reflecting mirrored element, are studied. High thermal characteristics of the modules were achieved due to increase in the area of heat sink holders by more than 2.5 – 3 times compared to flat-type LED modules. Scientific and technical sources were analyzed for selection of modern polyimide materials intended for development and manufacture of combined boards on heat-conductive bases with dielectrics made of polyimide films with increased thermal conductivity up to 0.36 – 0.75 W/(m•K). Potential possibility of creating effective combined printed circuit boards on heat-conductive basis, including those that can be bent, is confirmed using modern industrially manufactured thin heat-conductive PI films with heat-sealable thermoplastic coatings that provide the value of total thermal resistance of boards from 1.5 up to 2.8 °C•cm2/W.
{"title":"Combined heat conductive boards with polyimide dielectrics","authors":"V. Borshchov, O. Listratenko, M. Protsenko, I. Tymchuk, O.V. Kravchenko, O.V. Syddia, I.V. Borshchov, M. Slipchenko","doi":"10.30837/rt.2023.1.212.10","DOIUrl":"https://doi.org/10.30837/rt.2023.1.212.10","url":null,"abstract":"Heat-conductive properties of thin heat-conductive polyimide dielectrics have been studied and their thermal resistances have been calculated. Possibility of creating combined printed circuit boards on heat-conductive bases with reduced thermal resistances of polyimide dielectrics from ~ 0.2 to ~ 0.04 °С /W is confirmed. \u0000Design parameters and thermal properties of the combined boards with thin polyimide (PI) dielectrics for receivers of concentrated solar radiation are studied. Possibility of providing thermal resistances of PI dielectrics not exceeding 0.43 °С/W has been confirmed. \u0000Technical solutions of volumetric light-emitting diode (LED) modules on combined heat-conductive boards, which are 3D-holders-heat sinks, made in the form of single heat-conductive light-reflecting mirrored element, are studied. High thermal characteristics of the modules were achieved due to increase in the area of heat sink holders by more than 2.5 – 3 times compared to flat-type LED modules. \u0000Scientific and technical sources were analyzed for selection of modern polyimide materials intended for development and manufacture of combined boards on heat-conductive bases with dielectrics made of polyimide films with increased thermal conductivity up to 0.36 – 0.75 W/(m•K). \u0000Potential possibility of creating effective combined printed circuit boards on heat-conductive basis, including those that can be bent, is confirmed using modern industrially manufactured thin heat-conductive PI films with heat-sealable thermoplastic coatings that provide the value of total thermal resistance of boards from 1.5 up to 2.8 °C•cm2/W.","PeriodicalId":41675,"journal":{"name":"Visnyk NTUU KPI Seriia-Radiotekhnika Radioaparatobuduvannia","volume":"23 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72405662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-28DOI: 10.30837/rt.2023.1.212.11
A.I. Tsopa, A.A. Zarudny
The results of experimental studies of the energy characteristics of the leader transmitter built according to the lamp-pumped organic-dye oscillator-amplifier scheme are presented. When constructing the lidar emitter according to the oscillator-amplifier scheme under conditions of constant pump density, the problem arises of choosing the ratio between the length of the active element of the generator and the length of the active medium of the traveling wave amplifier, which ensures the maximum efficiency of the entire emitter. The main objective of the work was experimental verification of the results of theoretical studies in order to determine the factors influencing the choice of the ratio of the lengths of the active elements of the generator and amplifier based on the organic dye rhodamine 6G with lamp pumping with their limited total length. The results of the experiments confirm the theoretical conclusions that there are optimal ratios of the lengths of the generator and amplifier, at which the radiation energy is maximum. The limiting length of the amplifier and the energy of the emitter, built according to the scheme, the oscillator-amplifier are limited due to an increase in the intensity of the radiation that is amplified along the active element, as well as an increase in the intensity of the amplified noise.
{"title":"Experimental studies of a lidar emitter built according to the oscillator-amplifier scheme","authors":"A.I. Tsopa, A.A. Zarudny","doi":"10.30837/rt.2023.1.212.11","DOIUrl":"https://doi.org/10.30837/rt.2023.1.212.11","url":null,"abstract":"The results of experimental studies of the energy characteristics of the leader transmitter built according to the lamp-pumped organic-dye oscillator-amplifier scheme are presented. When constructing the lidar emitter according to the oscillator-amplifier scheme under conditions of constant pump density, the problem arises of choosing the ratio between the length of the active element of the generator and the length of the active medium of the traveling wave amplifier, which ensures the maximum efficiency of the entire emitter. The main objective of the work was experimental verification of the results of theoretical studies in order to determine the factors influencing the choice of the ratio of the lengths of the active elements of the generator and amplifier based on the organic dye rhodamine 6G with lamp pumping with their limited total length. \u0000The results of the experiments confirm the theoretical conclusions that there are optimal ratios of the lengths of the generator and amplifier, at which the radiation energy is maximum. The limiting length of the amplifier and the energy of the emitter, built according to the scheme, the oscillator-amplifier are limited due to an increase in the intensity of the radiation that is amplified along the active element, as well as an increase in the intensity of the amplified noise.","PeriodicalId":41675,"journal":{"name":"Visnyk NTUU KPI Seriia-Radiotekhnika Radioaparatobuduvannia","volume":"139 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77985108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-30DOI: 10.30837/rt.2022.4.211.13
I. Svyd, А.О. Sierikov, I. Obod
The paper demonstrates the important role of using radar systems in many spheres of human activity to solve complex and important problems of society. The paper examines and analyzes the capabilities of the MATLAB program package applying to the design, modernization and research of radar systems. The analysis performed shows that the MATLAB software package is a powerful tool for modeling, researching and designing radar systems for various purposes. Also, attention is paid to the MATLAB Radar Toolbox, which includes a wide range of available models that can be modified. The Radar Toolbox provides rapid modeling, upgrading and prototyping of standard and upgraded radar systems. Using the MATLAB to research radar systems is impossible without understanding the principles of construction and operation of radar systems. It is also necessary to know the features of using the MATLAB function to describe, present and model structural elements and processes in radar systems. The paper presents the main functionality and possible options for implementing models in the MATLAB for modeling and studying radar systems. The given list of model options is not exhaustive and final and can be expanded and supplemented depending on specific tasks and requirements for implementation.
{"title":"Applying MATLAB to Radar Systems Modeling","authors":"I. Svyd, А.О. Sierikov, I. Obod","doi":"10.30837/rt.2022.4.211.13","DOIUrl":"https://doi.org/10.30837/rt.2022.4.211.13","url":null,"abstract":"The paper demonstrates the important role of using radar systems in many spheres of human activity to solve complex and important problems of society. The paper examines and analyzes the capabilities of the MATLAB program package applying to the design, modernization and research of radar systems. The analysis performed shows that the MATLAB software package is a powerful tool for modeling, researching and designing radar systems for various purposes. Also, attention is paid to the MATLAB Radar Toolbox, which includes a wide range of available models that can be modified. The Radar Toolbox provides rapid modeling, upgrading and prototyping of standard and upgraded radar systems. Using the MATLAB to research radar systems is impossible without understanding the principles of construction and operation of radar systems. It is also necessary to know the features of using the MATLAB function to describe, present and model structural elements and processes in radar systems. The paper presents the main functionality and possible options for implementing models in the MATLAB for modeling and studying radar systems. The given list of model options is not exhaustive and final and can be expanded and supplemented depending on specific tasks and requirements for implementation.","PeriodicalId":41675,"journal":{"name":"Visnyk NTUU KPI Seriia-Radiotekhnika Radioaparatobuduvannia","volume":"49 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80121322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-30DOI: 10.30837/rt.2022.4.211.01
Ye. V. Ostrianska, S.O. Kandiy, I. Gorbenko, M. Yesina
Recent advances in quantum technology and the potential that practical quantum computers may become a reality in the future have led to renewed interest in developing cryptographic technologies that are secure against conventional and quantum attacks. Currently, virtually all asymmetric cryptographic schemes in use are threatened by the potential development of powerful quantum computers. Post-quantum cryptography is one of main the ways to combat this threat. Its security is based on the complexity of mathematical problems that are currently considered unsolvable efficiently, even with the help of quantum computers. The security of information systems is ensured through protection against various threats that use system vulnerabilities. Security protocols are the building blocks of secure communication. They implement security mechanisms to provide security services. Security protocols are considered abstract when analyzed, but may have additional vulnerabilities in implementation. This work contains a holistic study of security protocols. Basics of security protocols, taxonomy of attacks on security protocols and their implementation are considered, as well as various methods and models of protocol security analysis. In particular, the differences between information-theoretic and computational security, computational and symbolic models are specified. In addition, an overview of the computational security models for Authenticated Key Exchange (AKE) and Password Authentication Key Exchange (PAKE) protocols is provided. The most important security models for the AKE and PAKE protocols were also described. With the emergence of new technologies that may have different security requirements, as well as with increased opportunities for competition, there is always a need to develop new protocols. Thus, the purpose of this article is to review, classify, analyze, and research the vulnerabilities of information systems from classical, quantum, and special attacks, performed taking into account the forecast regarding the possibilities of attacks on post-quantum cryptographic transformations; studying security assessment models for existing cryptographic protocols, as well as reviewing and benchmarking security models and providing suggestions for protection against existing potential attacks.
{"title":"Classification and analysis of vulnerabilities of modern information systems from classical and quantum attacks","authors":"Ye. V. Ostrianska, S.O. Kandiy, I. Gorbenko, M. Yesina","doi":"10.30837/rt.2022.4.211.01","DOIUrl":"https://doi.org/10.30837/rt.2022.4.211.01","url":null,"abstract":"Recent advances in quantum technology and the potential that practical quantum computers may become a reality in the future have led to renewed interest in developing cryptographic technologies that are secure against conventional and quantum attacks. Currently, virtually all asymmetric cryptographic schemes in use are threatened by the potential development of powerful quantum computers. Post-quantum cryptography is one of main the ways to combat this threat. Its security is based on the complexity of mathematical problems that are currently considered unsolvable efficiently, even with the help of quantum computers. The security of information systems is ensured through protection against various threats that use system vulnerabilities. Security protocols are the building blocks of secure communication. They implement security mechanisms to provide security services. Security protocols are considered abstract when analyzed, but may have additional vulnerabilities in implementation. This work contains a holistic study of security protocols. Basics of security protocols, taxonomy of attacks on security protocols and their implementation are considered, as well as various methods and models of protocol security analysis. In particular, the differences between information-theoretic and computational security, computational and symbolic models are specified. In addition, an overview of the computational security models for Authenticated Key Exchange (AKE) and Password Authentication Key Exchange (PAKE) protocols is provided. The most important security models for the AKE and PAKE protocols were also described. With the emergence of new technologies that may have different security requirements, as well as with increased opportunities for competition, there is always a need to develop new protocols. Thus, the purpose of this article is to review, classify, analyze, and research the vulnerabilities of information systems from classical, quantum, and special attacks, performed taking into account the forecast regarding the possibilities of attacks on post-quantum cryptographic transformations; studying security assessment models for existing cryptographic protocols, as well as reviewing and benchmarking security models and providing suggestions for protection against existing potential attacks.","PeriodicalId":41675,"journal":{"name":"Visnyk NTUU KPI Seriia-Radiotekhnika Radioaparatobuduvannia","volume":"13 1","pages":""},"PeriodicalIF":0.3,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81483611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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