Pub Date : 2022-11-14DOI: 10.1109/UkrMW58013.2022.10037155
T. Tkachova
Some aspects of calculating the characteristics of corrugated cavities for second-harmonic gyrotrons are considered. The influence of spatial Fourier harmonics supported by corrugations on cavity eigenfields is studied. In some specific cases, a comparison of the Bloch harmonics method with the spatial harmonics method for low and high radial modes is presented. It is shown that the method of spatial harmonics, as opposed to Bloch harmonics method, provides accurate data on eigenfield distribution along the cross-section of the corrugated waveguide, with the exception of small areas near the edges of the corrugations.
{"title":"Effect of High Fourier Harmonics on Characteristics of Corrugated Cylindrical Waveguides","authors":"T. Tkachova","doi":"10.1109/UkrMW58013.2022.10037155","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10037155","url":null,"abstract":"Some aspects of calculating the characteristics of corrugated cavities for second-harmonic gyrotrons are considered. The influence of spatial Fourier harmonics supported by corrugations on cavity eigenfields is studied. In some specific cases, a comparison of the Bloch harmonics method with the spatial harmonics method for low and high radial modes is presented. It is shown that the method of spatial harmonics, as opposed to Bloch harmonics method, provides accurate data on eigenfield distribution along the cross-section of the corrugated waveguide, with the exception of small areas near the edges of the corrugations.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"56 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":"124216976","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/UkrMW58013.2022.10036988
S. Polevoy, A. Girich, S. Tarapov, A. Vakula, S. Nedukh, K. Sova
It was numerically shown that for a system of a spiral planar resonator with magnetic film, a large value of photon-magnon coupling strength was obtained for the mode with electromagnetic field structure in the form of the electric localized surface plasmon. It is explained by the fact that the magnet filling factor by the microwave magnetic field component reaches large values at the frequency of this mode, since the field intensity decreases rapidly along the normal to the resonator plane.
{"title":"Influence of the Magnet Filling Factor by the Field of Planar Resonators on the Photon-Magnon Coupling Strength","authors":"S. Polevoy, A. Girich, S. Tarapov, A. Vakula, S. Nedukh, K. Sova","doi":"10.1109/UkrMW58013.2022.10036988","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10036988","url":null,"abstract":"It was numerically shown that for a system of a spiral planar resonator with magnetic film, a large value of photon-magnon coupling strength was obtained for the mode with electromagnetic field structure in the form of the electric localized surface plasmon. It is explained by the fact that the magnet filling factor by the microwave magnetic field component reaches large values at the frequency of this mode, since the field intensity decreases rapidly along the normal to the resonator plane.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"227 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":"124504096","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/UkrMW58013.2022.10037113
M. Dzyubenko, V. Radionov, I. Kuzmichev, V. Maslov
The work substantiates the possibility of increasing the efficiency of lasers by smoothly expanding the radiation beam in the active substance. This makes it possible to use the energy of the active substance as efficiently as possible, avoiding the effect of saturation. A scheme of a laser resonator using the principle of smooth expansion of the radiation beam in the active substance is proposed. Recommendations are developed for the practical application of the proposed scheme and its variations in lasers of various ranges.
{"title":"Smooth Expansion of the Radiation Beam Aperture in a Laser Cavity","authors":"M. Dzyubenko, V. Radionov, I. Kuzmichev, V. Maslov","doi":"10.1109/UkrMW58013.2022.10037113","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10037113","url":null,"abstract":"The work substantiates the possibility of increasing the efficiency of lasers by smoothly expanding the radiation beam in the active substance. This makes it possible to use the energy of the active substance as efficiently as possible, avoiding the effect of saturation. A scheme of a laser resonator using the principle of smooth expansion of the radiation beam in the active substance is proposed. Recommendations are developed for the practical application of the proposed scheme and its variations in lasers of various ranges.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"203 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":"115898927","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/UkrMW58013.2022.10037020
Anatoly Mogyla, A. Linkova, V. Maltsev, G. Rudnev, S. Myroniuk
The results of the development and testing of a microwave scanning radiometer are presented.
介绍了一种微波扫描辐射计的研制和测试结果。
{"title":"Microwave Scanning Radiometric System for Radiothermal Monitoring of the Atmosphere","authors":"Anatoly Mogyla, A. Linkova, V. Maltsev, G. Rudnev, S. Myroniuk","doi":"10.1109/UkrMW58013.2022.10037020","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10037020","url":null,"abstract":"The results of the development and testing of a microwave scanning radiometer are presented.","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":"126621983","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/UkrMW58013.2022.10037157
Ivane Darsavelidze, R. Zaridze
In this paper, one of the possible methods for the approximate solution of the plane electromagnetic wave diffraction problem by the perfectly conducting sphere is discussed. The method assumes the representation of the solution by the minimal number of the zero order spherical Hankel functions. Their singularity points, in this case, must be located equidistantly along the axis of incident wave propagation. The presented numerical results confirm the validity of this method.
{"title":"About One Method for the Approximate Solution the Plane Wave Diffraction Problem by the Sphere","authors":"Ivane Darsavelidze, R. Zaridze","doi":"10.1109/UkrMW58013.2022.10037157","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10037157","url":null,"abstract":"In this paper, one of the possible methods for the approximate solution of the plane electromagnetic wave diffraction problem by the perfectly conducting sphere is discussed. The method assumes the representation of the solution by the minimal number of the zero order spherical Hankel functions. Their singularity points, in this case, must be located equidistantly along the axis of incident wave propagation. The presented numerical results confirm the validity of this method.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"18 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":"127357388","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/UkrMW58013.2022.10037007
Wenjun Wang, J. Sánchez-Heredia, V. Zhurbenko, J. Ardenkjær-Larsen
Shielded loops have recently attracted keen interest in the design of Magnetic Resonance Imaging (MRI) detector arrays. To prevent unwanted detuning of array elements, preamplifier decoupling is used. So far, the decoupling circuit design was based on intuitive approach of minimizing impedance presented to the terminals of the loop. The approach leads to decent but not optimal results. In this paper a systematic analytical method is used to derive the exact condition for maximum decoupling of shielded loops in array. The condition describes precisely what impedance should be presented to the terminals of the loop for best decoupling. It is shown that the method is valid for single- and multi-gap shielded loops with and without integrated reactive components across the gap. The presented results are useful in the design of MRI receive arrays of shielded loop coils with optimal decoupling.
{"title":"Condition for Optimal Preamplifier Decoupling in One-turn Single- and Multi-gap Shielded Loop MRI Detectors","authors":"Wenjun Wang, J. Sánchez-Heredia, V. Zhurbenko, J. Ardenkjær-Larsen","doi":"10.1109/UkrMW58013.2022.10037007","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10037007","url":null,"abstract":"Shielded loops have recently attracted keen interest in the design of Magnetic Resonance Imaging (MRI) detector arrays. To prevent unwanted detuning of array elements, preamplifier decoupling is used. So far, the decoupling circuit design was based on intuitive approach of minimizing impedance presented to the terminals of the loop. The approach leads to decent but not optimal results. In this paper a systematic analytical method is used to derive the exact condition for maximum decoupling of shielded loops in array. The condition describes precisely what impedance should be presented to the terminals of the loop for best decoupling. It is shown that the method is valid for single- and multi-gap shielded loops with and without integrated reactive components across the gap. The presented results are useful in the design of MRI receive arrays of shielded loop coils with optimal decoupling.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"8 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":"117158017","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/UkrMW58013.2022.10037097
O. Sukharevsky, I. Ryapolov, V. Vasilets, S. Nechitaylo
Using the methods of mathematical modeling, the values of the radar cross section (RCS) of the Su-27 aircraft model and trihedral corner reflectors in the high-frequency wavelength range were obtained. The scattering characteristics are estimated for trihedral corner reflectors that used as the main scattering element in the proposed model of an airborne radar decoy. The presented results show that in order to obtain sufficiently high values of the RCS of a radar decoy when probing from the front hemisphere, it is necessary to use a “quadruple” corner reflector. If it is necessary to simulate the exact median values of the RCS of a real object in a narrower range of irradiation angles, then it is better to use one tilted corner reflector. It is reasonable to use the obtained results at the developing aerial decoys to simulate the scattering of various complex aerodynamic objects, if corner reflectors are used as a reflective element.
{"title":"The Use of Corner Reflectors to Simulate Tactical Aircraft","authors":"O. Sukharevsky, I. Ryapolov, V. Vasilets, S. Nechitaylo","doi":"10.1109/UkrMW58013.2022.10037097","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10037097","url":null,"abstract":"Using the methods of mathematical modeling, the values of the radar cross section (RCS) of the Su-27 aircraft model and trihedral corner reflectors in the high-frequency wavelength range were obtained. The scattering characteristics are estimated for trihedral corner reflectors that used as the main scattering element in the proposed model of an airborne radar decoy. The presented results show that in order to obtain sufficiently high values of the RCS of a radar decoy when probing from the front hemisphere, it is necessary to use a “quadruple” corner reflector. If it is necessary to simulate the exact median values of the RCS of a real object in a narrower range of irradiation angles, then it is better to use one tilted corner reflector. It is reasonable to use the obtained results at the developing aerial decoys to simulate the scattering of various complex aerodynamic objects, if corner reflectors are used as a reflective element.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"31 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":"116519541","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/UkrMW58013.2022.10037139
S. Litvintsev, S. Rozenko, L. Pinchuk
The problem of synthesis of stepped impedance resonators (SIRs) and resonators with stubs, which contain transmission line segments of the same length and suppress harmonics of the main signal, is solved. It is established that SIR with $N$ composite segments allows us to continuously suppress $(boldsymbol{N}-1)$ harmonics $2boldsymbol{f}0, 3boldsymbol{f}_{0}, ldots, boldsymbol{Nf}_{0}$ of the main signal with a frequency $boldsymbol{f}_{0}$. To do this, it is necessary to coincide the anti-resonant frequencies of SIR with the specified harmonic frequencies. Simple expressions are established to determine the characteristic impedances of SIRs with four composed segments. It is shown that the transition from SIR to stub resonators improves their practical feasibility. Using the circuit simulator, the reliability of the presented solution was confirmed.
{"title":"Synthesis of Transmission Line Resonators for Harmonic Suppression","authors":"S. Litvintsev, S. Rozenko, L. Pinchuk","doi":"10.1109/UkrMW58013.2022.10037139","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10037139","url":null,"abstract":"The problem of synthesis of stepped impedance resonators (SIRs) and resonators with stubs, which contain transmission line segments of the same length and suppress harmonics of the main signal, is solved. It is established that SIR with $N$ composite segments allows us to continuously suppress $(boldsymbol{N}-1)$ harmonics $2boldsymbol{f}0, 3boldsymbol{f}_{0}, ldots, boldsymbol{Nf}_{0}$ of the main signal with a frequency $boldsymbol{f}_{0}$. To do this, it is necessary to coincide the anti-resonant frequencies of SIR with the specified harmonic frequencies. Simple expressions are established to determine the characteristic impedances of SIRs with four composed segments. It is shown that the transition from SIR to stub resonators improves their practical feasibility. Using the circuit simulator, the reliability of the presented solution was confirmed.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"20 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":"116522841","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/UkrMW58013.2022.10037158
T. Kalmykova, S. Krylov, V. Cambel
We aim to test the influence of the focused ion beam on the magnetic properties of the simple permalloy structures. We showed through simulation and experiment that the switch from an initial state to the single domain happens even for the partly cut elements. The formed trenches' precise parameters and the required minimal dose are yet to be determined.
{"title":"Ferromagnetic Nanostructures for Topological Magnonics Fabricated by Focused Ion Beam Technology","authors":"T. Kalmykova, S. Krylov, V. Cambel","doi":"10.1109/UkrMW58013.2022.10037158","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10037158","url":null,"abstract":"We aim to test the influence of the focused ion beam on the magnetic properties of the simple permalloy structures. We showed through simulation and experiment that the switch from an initial state to the single domain happens even for the partly cut elements. The formed trenches' precise parameters and the required minimal dose are yet to be determined.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"65 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":"126300512","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/UkrMW58013.2022.10036992
K. Sova, A. Vakula, S. Polevoy, S. Tarapov, S. Nedukh, A. Girich
The experimental study and numerical simulation of the strong photon-magnon coupling was carried out for the planar waveguide with the defect, which was used as a planar resonator. The experimental spatial distribution of the magnetic component intensity of the electromagnetic field indicates its considerable increase in the defect due to the novel shape of the defect. The obtained under ferromagnetic resonance conditions transmission coefficient spectra have shown that the maximal value of spin-number-normalized photon-magnon coupling strength gN has reached 0.89 Hz at the frequency of 6.4 GHz. The optimal size of the YIG film that filled the defect had been established.
{"title":"Planar Waveguide Defect for Photon-Magnon Coupling Improvement","authors":"K. Sova, A. Vakula, S. Polevoy, S. Tarapov, S. Nedukh, A. Girich","doi":"10.1109/UkrMW58013.2022.10036992","DOIUrl":"https://doi.org/10.1109/UkrMW58013.2022.10036992","url":null,"abstract":"The experimental study and numerical simulation of the strong photon-magnon coupling was carried out for the planar waveguide with the defect, which was used as a planar resonator. The experimental spatial distribution of the magnetic component intensity of the electromagnetic field indicates its considerable increase in the defect due to the novel shape of the defect. The obtained under ferromagnetic resonance conditions transmission coefficient spectra have shown that the maximal value of spin-number-normalized photon-magnon coupling strength gN has reached 0.89 Hz at the frequency of 6.4 GHz. The optimal size of the YIG film that filled the defect had been established.","PeriodicalId":297673,"journal":{"name":"2022 IEEE 2nd Ukrainian Microwave Week (UkrMW)","volume":"140 4 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":"125828164","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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