Pub Date : 2018-07-01DOI: 10.1109/MMET.2018.8460317
V. G. Sugak, A. Dubovitsky
The problem of antenna aperture synthesis has been solved for the georadar probing on a relatively large surface area of the ground to increase the resolution in the horizontal plane in depth. Aperture synthesis is carried out with a priori unknown values of the radio wave propagation phase velocity below the surface of the soil and its frequency dispersion. For this, iterative procedures are used, in which the radio wave deceleration factor in the soil and the form of the frequency dependence of the radio wave propagation phase velocity are changed. Iterative procedures are completed when the image contrast of the heterogeneities of the subsurface soil structure reaches the greatest value.
{"title":"Antenna Aperture Synthesis for SFCW GPR in a Medium with Frequency Dispersion of Radio-Waves Propagation Phase Velocity","authors":"V. G. Sugak, A. Dubovitsky","doi":"10.1109/MMET.2018.8460317","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460317","url":null,"abstract":"The problem of antenna aperture synthesis has been solved for the georadar probing on a relatively large surface area of the ground to increase the resolution in the horizontal plane in depth. Aperture synthesis is carried out with a priori unknown values of the radio wave propagation phase velocity below the surface of the soil and its frequency dispersion. For this, iterative procedures are used, in which the radio wave deceleration factor in the soil and the form of the frequency dependence of the radio wave propagation phase velocity are changed. Iterative procedures are completed when the image contrast of the heterogeneities of the subsurface soil structure reaches the greatest value.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115464083","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 : 2018-07-01DOI: 10.1109/MMET.2018.8460384
Sergii V. Dukhopelnykov
We study the problem of the scattering of an H-polarised plane wave by infinite dielectric wire with partial graphene cover. In this work, mathematical models are developed based on the boundary hyper-singular integral equation operator which should be understood in the sense of Hadamard's finite part. Discretization of the derived integral equations is carried out by the Nystrom-type method (of discrete singularities). With the help of the obtained discrete models, we plot the dependences of total scattering cross-section (TSCS), backscattering cross-section (BCS) and absorption cross-section (ACS) on the frequency, slot size and chemical potential of graphene.
{"title":"Scattering of H-polarized Plane Wave by a Circular Dielectric Wire with Partial Graphene Cover","authors":"Sergii V. Dukhopelnykov","doi":"10.1109/MMET.2018.8460384","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460384","url":null,"abstract":"We study the problem of the scattering of an H-polarised plane wave by infinite dielectric wire with partial graphene cover. In this work, mathematical models are developed based on the boundary hyper-singular integral equation operator which should be understood in the sense of Hadamard's finite part. Discretization of the derived integral equations is carried out by the Nystrom-type method (of discrete singularities). With the help of the obtained discrete models, we plot the dependences of total scattering cross-section (TSCS), backscattering cross-section (BCS) and absorption cross-section (ACS) on the frequency, slot size and chemical potential of graphene.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122489287","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 : 2018-07-01DOI: 10.1109/MMET.2018.8460331
S. Trofymenko
The problem of coherent X-ray radiation by an ultra-relativistic electron with non-Coulomb proper field in ultrathin crystalline target is considered. The electron is assumed to be stripped of its proper field in the result of preliminary penetration through a thick target. It is shown that in the considered case such radiation characteristics as its angular distribution and total yield are not described by the known text-book formulae and depend on the distance between the targets. Expressions defining such characteristics are derived.
{"title":"Coherent X-ray Radiation by an Ultra-relativistic “Half-bare” Electron in Thin Crystal","authors":"S. Trofymenko","doi":"10.1109/MMET.2018.8460331","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460331","url":null,"abstract":"The problem of coherent X-ray radiation by an ultra-relativistic electron with non-Coulomb proper field in ultrathin crystalline target is considered. The electron is assumed to be stripped of its proper field in the result of preliminary penetration through a thick target. It is shown that in the considered case such radiation characteristics as its angular distribution and total yield are not described by the known text-book formulae and depend on the distance between the targets. Expressions defining such characteristics are derived.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121880806","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 : 2018-07-01DOI: 10.1109/MMET.2018.8460425
V. Rozov, V. Grinchenko, O. Tkachenko, A. Yerisov
In this paper we present an analytical model of the magnetic field of a high-voltage three-phase cable line with two-point bonded shields. The cable line is assumed to consist of three single-core XLPE insulated cables. The represented analytical model allows to calculate the electric currents induced in shields of cables and to determine the magnetic field distribution for the arbitrary layout of cables. We obtain an exact compact expression for the magnetic field shielding factor for the trefoil cable line with two-point bonded shields. Also we obtain a simplified compact expression for the magnetic field shielding factor for the flat cable line with two-point bonded shields. We show that the difference of the simplified expression with the exact analytical expression and experimental results is within 4 %.
{"title":"Analytical Calculation of Magnetic Field Shielding Factor for Cable Line with Two-Point Bonded Shields","authors":"V. Rozov, V. Grinchenko, O. Tkachenko, A. Yerisov","doi":"10.1109/MMET.2018.8460425","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460425","url":null,"abstract":"In this paper we present an analytical model of the magnetic field of a high-voltage three-phase cable line with two-point bonded shields. The cable line is assumed to consist of three single-core XLPE insulated cables. The represented analytical model allows to calculate the electric currents induced in shields of cables and to determine the magnetic field distribution for the arbitrary layout of cables. We obtain an exact compact expression for the magnetic field shielding factor for the trefoil cable line with two-point bonded shields. Also we obtain a simplified compact expression for the magnetic field shielding factor for the flat cable line with two-point bonded shields. We show that the difference of the simplified expression with the exact analytical expression and experimental results is within 4 %.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130596668","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 : 2018-07-01DOI: 10.1109/MMET.2018.8460329
F. Bogdanov, R. Jobava
This paper is aimed to review some recent achievements in the Method of Moments (MoM) applications to computational electromagnetics related to new formulations for overcoming the low frequency (fine mesh) instability problems, modeling of printed and impedance structures, multiport networks and waveguide ports, as well as their hybridizations with mixed conducting and dielectric objects. The validation of the developed approaches and their application to practical EM/ EMI/ EMC problems will be demonstrated.
{"title":"New Achievements in MoM Applications to Computational Electromagnetics","authors":"F. Bogdanov, R. Jobava","doi":"10.1109/MMET.2018.8460329","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460329","url":null,"abstract":"This paper is aimed to review some recent achievements in the Method of Moments (MoM) applications to computational electromagnetics related to new formulations for overcoming the low frequency (fine mesh) instability problems, modeling of printed and impedance structures, multiport networks and waveguide ports, as well as their hybridizations with mixed conducting and dielectric objects. The validation of the developed approaches and their application to practical EM/ EMI/ EMC problems will be demonstrated.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121367380","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 : 2018-07-01DOI: 10.1109/MMET.2018.8460342
M. Andriychuk
The approach that takes into account the requirements to the electromagnetic field (EM) characteristics in Fresnel zone while statement of synthesis problem according to prescribed amplitude pattern for the plane arrays is proposed. The synthesis problem is formulated in the variational statement. The optimizing functional contains the term, which provides the possibility to minimize the EM field amplitude in near zone of array. The respective Euler equation of functional is obtained and the successive approximation method is used for its numerical solving. The computational results are discussed.
{"title":"Synthesis of Plane Arrays with Restrictions in Fresnel Zone","authors":"M. Andriychuk","doi":"10.1109/MMET.2018.8460342","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460342","url":null,"abstract":"The approach that takes into account the requirements to the electromagnetic field (EM) characteristics in Fresnel zone while statement of synthesis problem according to prescribed amplitude pattern for the plane arrays is proposed. The synthesis problem is formulated in the variational statement. The optimizing functional contains the term, which provides the possibility to minimize the EM field amplitude in near zone of array. The respective Euler equation of functional is obtained and the successive approximation method is used for its numerical solving. The computational results are discussed.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114768731","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 : 2018-07-01DOI: 10.1109/MMET.2018.8460441
T. Zinenko
We study, using a convergent in-house numerical algorithm, the scattering and absorption of the H-polarized plane wave by a two-layer grating of identical coplanar graphene strips embedded in a lossless dielectric slab. Our instrument is the method of analytical regularization, or, more precisely, the projection of the associated singular integral equation on the set of the weighted second-kind Chebyshev polynomials, which invert the static part of the problem. We compute the reflectance, transmittance, and absorbance of such a composite metasurface versus the frequency, in the range from 0.1 to 10 THz. We reveal multiple resonances and explain their nature with the aid of the in-resonance near field portraits. Ultra-high-Q resonances on the grating (lattice) mode are paid special attention.
{"title":"Identifying the Resonances in Terahertz Wave Scattering from a Two-Layer Graphene Strip Grating Embedded in a Dielectric Slab","authors":"T. Zinenko","doi":"10.1109/MMET.2018.8460441","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460441","url":null,"abstract":"We study, using a convergent in-house numerical algorithm, the scattering and absorption of the H-polarized plane wave by a two-layer grating of identical coplanar graphene strips embedded in a lossless dielectric slab. Our instrument is the method of analytical regularization, or, more precisely, the projection of the associated singular integral equation on the set of the weighted second-kind Chebyshev polynomials, which invert the static part of the problem. We compute the reflectance, transmittance, and absorbance of such a composite metasurface versus the frequency, in the range from 0.1 to 10 THz. We reveal multiple resonances and explain their nature with the aid of the in-resonance near field portraits. Ultra-high-Q resonances on the grating (lattice) mode are paid special attention.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125651268","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 : 2018-07-01DOI: 10.1109/MMET.2018.8460433
T. Tkachova, V. Shcherbinin, V. Tkachenko
An approximate surface impedance model (SIM) is widely used in practice to calculate and optimize the electromagnetic properties of corrugated RF structures. According to this model, the corrugated walls are replaced by a homogeneous surface with averaged anisotropic impedance, which depends on the corrugation parameters. In this study, the SIM validity is investigated for TE waves of a circular waveguide with longitudinal wall corrugations. The investigation is based on the full-wave approach, which accounts for the coupling between the fundamental and higher space harmonics. It is shown that this coupling may invalidate the results of the surface impedance model, even though the widely accepted condition of SIM validity is fulfilled.
{"title":"Validity of Surface Impedance Model for Electromagnetic Analysis of a Corrugated Gyrotron Cavity","authors":"T. Tkachova, V. Shcherbinin, V. Tkachenko","doi":"10.1109/MMET.2018.8460433","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460433","url":null,"abstract":"An approximate surface impedance model (SIM) is widely used in practice to calculate and optimize the electromagnetic properties of corrugated RF structures. According to this model, the corrugated walls are replaced by a homogeneous surface with averaged anisotropic impedance, which depends on the corrugation parameters. In this study, the SIM validity is investigated for TE waves of a circular waveguide with longitudinal wall corrugations. The investigation is based on the full-wave approach, which accounts for the coupling between the fundamental and higher space harmonics. It is shown that this coupling may invalidate the results of the surface impedance model, even though the widely accepted condition of SIM validity is fulfilled.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133588570","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 : 2018-07-01DOI: 10.1109/MMET.2018.8460246
K. Domina, V. Khardikov
The enhancement of luminescence of quantum dots (QD) layer coating the resonant metasurface formed by silicon disks is studied. It was revealed that exciting of trapped mode resonance in metasurface provides much stronger the luminescence enhancement comparing with case of usual dipole resonances. It opens prospective for development of light amplifier and generator based on all-dielectric metasurface.
{"title":"QD Layer Luminescence Enhancement Via Coupling with Disk Metasurface In Trapped Mode Regime","authors":"K. Domina, V. Khardikov","doi":"10.1109/MMET.2018.8460246","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460246","url":null,"abstract":"The enhancement of luminescence of quantum dots (QD) layer coating the resonant metasurface formed by silicon disks is studied. It was revealed that exciting of trapped mode resonance in metasurface provides much stronger the luminescence enhancement comparing with case of usual dipole resonances. It opens prospective for development of light amplifier and generator based on all-dielectric metasurface.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"220 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115492124","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 : 2018-07-01DOI: 10.1109/MMET.2018.8460298
M. Legenkiy
Today there are a lot of different grating that needs effective calculation techniques. In this paper calculation approach for axially symmetric grating with many elements is proposed. The proposed technique is based on Body Of Revolution Finite Difference in Time Domain (BOR FDTD) method. This method is used for calculation of reflection and transmission coefficients for different modes of a hollow dielectric waveguide for axially symmetric grating. Effective approach for the dielectric substrate accounting is proposed. Some numerical results for the grating both with and without substrate are presented.
{"title":"Axially Symmetric Diffraction Grating on Substrate in Dielectric Waveguide","authors":"M. Legenkiy","doi":"10.1109/MMET.2018.8460298","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460298","url":null,"abstract":"Today there are a lot of different grating that needs effective calculation techniques. In this paper calculation approach for axially symmetric grating with many elements is proposed. The proposed technique is based on Body Of Revolution Finite Difference in Time Domain (BOR FDTD) method. This method is used for calculation of reflection and transmission coefficients for different modes of a hollow dielectric waveguide for axially symmetric grating. Effective approach for the dielectric substrate accounting is proposed. Some numerical results for the grating both with and without substrate are presented.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125011412","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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