Pub Date : 2022-11-14DOI: 10.1109/UkrMW58013.2022.10037076
Y. Averkov, Y. Prokopenko, V. Yakovenko, V. Yampol'skii
The dispersion properties of electromagnetic eigenmodes in a semiconductor nanotube filled by a nonmagnetic dielectric and placed in a coaxial DC magnetic field have been studied theoretically. A new quantum electrodynamical phenomenon has been predicted. An increase of the two-dimensional electron density in the nanotube is shown to lead to the appearance of more and more new branches in the eigenmodes spectrum. It has been demonstrated that the number of branches monotonously increases when increasing the two-dimensional electron density and experiences the Aharonov-Bohm oscillations with growth of the number of magnetic flux quanta through the nanotube.
{"title":"Aharonov-Bohm Effect in the Spectrum of Eigenmodes in Semiconductor Nanotubes with Dielectric Filling in DC Magnetic Field","authors":"Y. Averkov, Y. Prokopenko, V. Yakovenko, V. Yampol'skii","doi":"10.1109/UkrMW58013.2022.10037076","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10037076","url":null,"abstract":"The dispersion properties of electromagnetic eigenmodes in a semiconductor nanotube filled by a nonmagnetic dielectric and placed in a coaxial DC magnetic field have been studied theoretically. A new quantum electrodynamical phenomenon has been predicted. An increase of the two-dimensional electron density in the nanotube is shown to lead to the appearance of more and more new branches in the eigenmodes spectrum. It has been demonstrated that the number of branches monotonously increases when increasing the two-dimensional electron density and experiences the Aharonov-Bohm oscillations with growth of the number of magnetic flux quanta through the nanotube.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131683883","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 : 2022-11-14DOI: 10.1109/UkrMW58013.2022.10037018
O. Drobakhin, L. Filins’kyy
In the paper the characteristics of electromagnetic waves reflection in samples of liquid foams of various foaming ratio were studied. The value of the foaming ratio of water foams based on water and salt additives 1-6% was in the range of 10-85 units. The measurements were carried out in the frequency range 1 - 1250 MHz in a microstrip cell using a P4-11 standing wave coefficient and attenuation meter, as well as foam structure generator based on a Schott filter. It is possible to change the characteristics of the reflection of electromagnetic waves by changing the ratio of the foam and the salinity of the foaming solution, especially in the low-frequency part of the studied wave range. Based on the foaming agents and salt additives dynamic coatings may be created with a reason to reduce the electromagnetic waves reflection from objects with metal surfaces.
{"title":"Characteristics of Electromagnetic Waves Reflection 1-1250 MHz in Liquid Foams","authors":"O. Drobakhin, L. Filins’kyy","doi":"10.1109/UkrMW58013.2022.10037018","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10037018","url":null,"abstract":"In the paper the characteristics of electromagnetic waves reflection in samples of liquid foams of various foaming ratio were studied. The value of the foaming ratio of water foams based on water and salt additives 1-6% was in the range of 10-85 units. The measurements were carried out in the frequency range 1 - 1250 MHz in a microstrip cell using a P4-11 standing wave coefficient and attenuation meter, as well as foam structure generator based on a Schott filter. It is possible to change the characteristics of the reflection of electromagnetic waves by changing the ratio of the foam and the salinity of the foaming solution, especially in the low-frequency part of the studied wave range. Based on the foaming agents and salt additives dynamic coatings may be created with a reason to reduce the electromagnetic waves reflection from objects with metal surfaces.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128867720","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 : 2022-11-14DOI: 10.1109/UkrMW58013.2022.10037045
Vera Jeladze, L. Shoshiashvili, B. Partsvania
The proposed paper aims to investigate the possible harmful effects of radiofrequency (RF) electromagnetic fields (EMFs) used in the 5th generation (5G) networks on the most important insect, a honey bee. The expected hazardous impact will lead to the disturbance of balance in certain bio-systems, and also a food crisis. As it is well known, the plants on the planet are mainly pollinated by honey bees and other insects. A significant reduction of pollinators will lead to harvest failure. Therefore, 5G systems might significantly damage the life cycle of insects, and this will lead to the destruction of the food chain. This will have an extremely large negative effect on humans. In the presented study, the dielectric heating effect caused by EMFs was studied on honey bees from 2.5 GHz to 100 GHz by the Finite-Difference Time-Domain (FDTD) method. A discrete, 3-tissue honey bee model was used for FDTD modeling, and a new approach for the selection of tissues' EM parameters was introduced. The Specific Absorption Rate (SAR) peak values were evaluated for honey bee tissues. The obtained results showed the possible harmful effects at some frequencies, depending on the direction of the incident electromagnetic (EM) wave and E-field polarization and frequency.
{"title":"An Investigation into the Impact of 5G EMFs on a Honey Bee","authors":"Vera Jeladze, L. Shoshiashvili, B. Partsvania","doi":"10.1109/UkrMW58013.2022.10037045","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10037045","url":null,"abstract":"The proposed paper aims to investigate the possible harmful effects of radiofrequency (RF) electromagnetic fields (EMFs) used in the 5th generation (5G) networks on the most important insect, a honey bee. The expected hazardous impact will lead to the disturbance of balance in certain bio-systems, and also a food crisis. As it is well known, the plants on the planet are mainly pollinated by honey bees and other insects. A significant reduction of pollinators will lead to harvest failure. Therefore, 5G systems might significantly damage the life cycle of insects, and this will lead to the destruction of the food chain. This will have an extremely large negative effect on humans. In the presented study, the dielectric heating effect caused by EMFs was studied on honey bees from 2.5 GHz to 100 GHz by the Finite-Difference Time-Domain (FDTD) method. A discrete, 3-tissue honey bee model was used for FDTD modeling, and a new approach for the selection of tissues' EM parameters was introduced. The Specific Absorption Rate (SAR) peak values were evaluated for honey bee tissues. The obtained results showed the possible harmful effects at some frequencies, depending on the direction of the incident electromagnetic (EM) wave and E-field polarization and frequency.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121081817","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 : 2022-11-14DOI: 10.1109/UkrMW58013.2022.10037071
O. Voitovych, Volodymyr Morozov, I. Kuzmichev, D. Atamanskiy, O. Kogut, Olekciy Kostenko
The features of an experimental study of the effect of precipitation, such as, water, snow, ice and their mixture on the surface of cm-wave meteorological radar antennas on signal parameters because of decreasing the gain are shown. Also, the results of synchronous measurements of the reflector antenna gain, rain intensity and amount of precipitation on the reflector are presented. It is shown that the presence of even a small amount of moisture leads to a significant decreasing the gain. This is especially important for meteorological radars at measuring the absolute values of the power of signals reflected from meteorological objects.
{"title":"Distortion of Weather Radar Signals at the Presence of Precipitation on the Emitting Surface of Antennas","authors":"O. Voitovych, Volodymyr Morozov, I. Kuzmichev, D. Atamanskiy, O. Kogut, Olekciy Kostenko","doi":"10.1109/UkrMW58013.2022.10037071","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10037071","url":null,"abstract":"The features of an experimental study of the effect of precipitation, such as, water, snow, ice and their mixture on the surface of cm-wave meteorological radar antennas on signal parameters because of decreasing the gain are shown. Also, the results of synchronous measurements of the reflector antenna gain, rain intensity and amount of precipitation on the reflector are presented. It is shown that the presence of even a small amount of moisture leads to a significant decreasing the gain. This is especially important for meteorological radars at measuring the absolute values of the power of signals reflected from meteorological objects.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121237556","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 : 2022-11-14DOI: 10.1109/UkrMW58013.2022.10036953
V. Pavlikov, Valeriy Volosyuk, E. Tserne, Natalііa M. Sydorenko, Ihor Prokofiev, M. Peretiatko
An algorithm for optimal signal processing in the radar, measuring three components of the full helicopter flight speed vector, has been synthesized. Several partial problems have been solved for this. In particular, the equation of the distance between the radar antenna and the underlying surface has been found, considering that the helicopter can occupy any position in space relative to the underlying surface. In the solved problem, the antenna radiation pattern is rigidly fixed relative to the helicopter building axis. Unlike the traditional approach, which consists of measuring the components of the velocity vector along the 0x and 0y coordinates by the Doppler frequency shift, the range “migration” information parameter within the irradiated section of the underlying surface is used. As a probing signal, the feasibility of using a signal with linear frequency modulation is substantiated. In contrast to the conventional approach to synthesizing speed determination problems, it is proposed to present the received signal as a superposition of signals reflected by the area irradiated by the antenna's directional pattern. It is shown that it is enough to form three independent beams that are correspond to three independent channels of measuring the law of the range change to solve the problem. Based on the synthesized signal processing algorithm, a structural diagram of the radar has been developed. The results of radar modeling confirm the effectiveness of the results presented in the report.
{"title":"Radar for Aircraft Motion Vector Components Measurement","authors":"V. Pavlikov, Valeriy Volosyuk, E. Tserne, Natalііa M. Sydorenko, Ihor Prokofiev, M. Peretiatko","doi":"10.1109/UkrMW58013.2022.10036953","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10036953","url":null,"abstract":"An algorithm for optimal signal processing in the radar, measuring three components of the full helicopter flight speed vector, has been synthesized. Several partial problems have been solved for this. In particular, the equation of the distance between the radar antenna and the underlying surface has been found, considering that the helicopter can occupy any position in space relative to the underlying surface. In the solved problem, the antenna radiation pattern is rigidly fixed relative to the helicopter building axis. Unlike the traditional approach, which consists of measuring the components of the velocity vector along the 0x and 0y coordinates by the Doppler frequency shift, the range “migration” information parameter within the irradiated section of the underlying surface is used. As a probing signal, the feasibility of using a signal with linear frequency modulation is substantiated. In contrast to the conventional approach to synthesizing speed determination problems, it is proposed to present the received signal as a superposition of signals reflected by the area irradiated by the antenna's directional pattern. It is shown that it is enough to form three independent beams that are correspond to three independent channels of measuring the law of the range change to solve the problem. Based on the synthesized signal processing algorithm, a structural diagram of the radar has been developed. The results of radar modeling confirm the effectiveness of the results presented in the report.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121649807","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 : 2022-11-14DOI: 10.1109/UkrMW58013.2022.10037035
Andrii V. Vasyliev, G. Sotnikov, A. Povrozin, O.O. Svistunov
The dependence of the acceleration rate of charged particle bunches with the energy of 300 keV by a surface wave excited by a laser pulse is analyzed using flat and periodic chip structures. It is shown that when using periodic structures with the 2nd operating spatial mode, there is a decrease in the acceleration rate in comparison with the use of periodic structures with the 1st operation mode. It is also demonstrated that the acceleration rate when using a flat dielectric structure is significantly higher in comparison with a periodic chip structure.
{"title":"DLA Flat vs Periodic Structure for Low Energy Electron Beam Acceleration","authors":"Andrii V. Vasyliev, G. Sotnikov, A. Povrozin, O.O. Svistunov","doi":"10.1109/UkrMW58013.2022.10037035","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10037035","url":null,"abstract":"The dependence of the acceleration rate of charged particle bunches with the energy of 300 keV by a surface wave excited by a laser pulse is analyzed using flat and periodic chip structures. It is shown that when using periodic structures with the 2nd operating spatial mode, there is a decrease in the acceleration rate in comparison with the use of periodic structures with the 1st operation mode. It is also demonstrated that the acceleration rate when using a flat dielectric structure is significantly higher in comparison with a periodic chip structure.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133744946","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 : 2022-11-14DOI: 10.1109/UkrMW58013.2022.10037086
Oleksander Barannik, I. Protsenko, Mykola Cherpak, Svitlana Vitusevich
The paper analyzes the dissipative properties of microstrip (planar) whispering gallery mode (WGM) resonators by comparing the Q-factors of resonators based on both HTS and normal metal films. The analysis was performed in the frequency range from 1.5 GHz to 40 GHz. By using numerical simulation of partial Q-factors it is shown that the value of the total (eigen) Q-factor at a temperature of 77 K for the microstrip WGM YBa2Cu3O7-δ- based resonator exceeds the Q-factor value obtained for the similar copper-based resonator in the entire frequency range under study. This superiority is about 2 orders of magnitude at 1.5 GHz and about 5 times at 40 GHz.
{"title":"Q-Factor of Microstrip WGM Resonators Based on YBaCuO and Normal Metal Films","authors":"Oleksander Barannik, I. Protsenko, Mykola Cherpak, Svitlana Vitusevich","doi":"10.1109/UkrMW58013.2022.10037086","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10037086","url":null,"abstract":"The paper analyzes the dissipative properties of microstrip (planar) whispering gallery mode (WGM) resonators by comparing the Q-factors of resonators based on both HTS and normal metal films. The analysis was performed in the frequency range from 1.5 GHz to 40 GHz. By using numerical simulation of partial Q-factors it is shown that the value of the total (eigen) Q-factor at a temperature of 77 K for the microstrip WGM YBa2Cu3O7-δ- based resonator exceeds the Q-factor value obtained for the similar copper-based resonator in the entire frequency range under study. This superiority is about 2 orders of magnitude at 1.5 GHz and about 5 times at 40 GHz.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133374694","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 : 2022-11-14DOI: 10.1109/UkrMW58013.2022.10037044
Daniele Pinchera
In this contribution, an effective strategy for the synthesis of equal-amplitude (isophoric) sparse arrays is presented. The approach consists of an iterative procedure starting from a non-equal amplitude layout. The method is very effective, and is demonstrated by an in-depth numerical analysis of a synthesis example.
{"title":"An Optimization Strategy for the Synthesis of Hi-Performance Isophoric Sparse Arrays","authors":"Daniele Pinchera","doi":"10.1109/UkrMW58013.2022.10037044","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10037044","url":null,"abstract":"In this contribution, an effective strategy for the synthesis of equal-amplitude (isophoric) sparse arrays is presented. The approach consists of an iterative procedure starting from a non-equal amplitude layout. The method is very effective, and is demonstrated by an in-depth numerical analysis of a synthesis example.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115694186","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 : 2022-11-14DOI: 10.1109/UkrMW58013.2022.10037031
L. Angermann
Some theoretical and computational results for energy-stable conformal finite element time-domain discretizations of Maxwell's system of differential equations with a cubic polarization term are presented. The focus is on energy estimates in the full range from the continuous to the semidiscrete to the fully discrete problem. In addition, an optimal estimate of the fully discrete error for the numerical approximation that is free from step size restrictions is given. Finally, some results of computer experiments are demonstrated.
{"title":"Energy-Stability of Time-Domain Finite Element Solutions to Maxwell's Equations with Cubic Polarization","authors":"L. Angermann","doi":"10.1109/UkrMW58013.2022.10037031","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10037031","url":null,"abstract":"Some theoretical and computational results for energy-stable conformal finite element time-domain discretizations of Maxwell's system of differential equations with a cubic polarization term are presented. The focus is on energy estimates in the full range from the continuous to the semidiscrete to the fully discrete problem. In addition, an optimal estimate of the fully discrete error for the numerical approximation that is free from step size restrictions is given. Finally, some results of computer experiments are demonstrated.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123239946","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 : 2022-11-14DOI: 10.1109/UkrMW58013.2022.10037133
Y. Sashkova, E. Odarenko, A. Shmat’ko, O. Afanasieva
Waveguides with additional layers between hollow core and periodic binary and ternary structure are considered. On the base of dispersion equation solutions dispersion diagrams are calculated. Spatial field distributions are built for different additional layers permittivity values. It is shown that waveguide with ternary cladding has wider possibility for tuning than binary ones. Permittivity changing makes possible to almost double times increasing of the field amplitude in the central part of the channel. This feature can be useful for interaction with sheet electron beams.
{"title":"Modified Bragg Reflection Waveguides with Binary and Ternary Claddings","authors":"Y. Sashkova, E. Odarenko, A. Shmat’ko, O. Afanasieva","doi":"10.1109/UkrMW58013.2022.10037133","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10037133","url":null,"abstract":"Waveguides with additional layers between hollow core and periodic binary and ternary structure are considered. On the base of dispersion equation solutions dispersion diagrams are calculated. Spatial field distributions are built for different additional layers permittivity values. It is shown that waveguide with ternary cladding has wider possibility for tuning than binary ones. Permittivity changing makes possible to almost double times increasing of the field amplitude in the central part of the channel. This feature can be useful for interaction with sheet electron beams.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124934664","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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