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Shestopalov, Yury
##### Publications (10 of 115) Show all publications
Smith, P. D., Vinogradova, E. D. & Shestopalov, Y. (2019). Accurate cutoff wavenumbers of a waveguide perturbed by axially aligned inner conductors. In: 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA): . Paper presented at 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), 9-13 September 2019, Granada, Spain (pp. 1049-1049).
Open this publication in new window or tab >>Accurate cutoff wavenumbers of a waveguide perturbed by axially aligned inner conductors
2019 (English)In: 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2019, p. 1049-1049Conference paper, Published paper (Refereed)
##### Abstract [en]

Time-harmonic propagating modes in a perfectly electrically conducting waveguide with constant cross-section $\partial \mathrm{D}$ and axis aligned with the z-axis have the form $\mathrm{u}(\mathrm{x},\mathrm{y})\mathrm{e}^{-\mathrm{i}\omega \mathrm{t}-\mathrm{i}\gamma\mathrm{z}}$ where the cross-sectional function u satisfies the two-dimensional Helmholtz equation $(\Delta+\lambda)\mathrm{u}=0$; here $k$ denotes the wavenumber and $\lambda=\mathrm{k}^{2}-\gamma^{2}$. Propagating modes occur at values $\lambda_{1}\leq\lambda_{2}\leq\lambda_{3}\leq\cdots$ of $\lambda$ generating non-trivial solutions of the Helmholtz equation; the cutoff wavenumbers correspond to setting $\gamma$ to zero. Now suppose that axially aligned PEC structures of cross-section $\Gamma$ are inserted in the waveguide. The propagation constants are perturbed to values that may be denoted $\lambda_{1}+\Delta\lambda_{1},\lambda_{2}+\Delta\lambda_{2},\ldots$; the cutoff wavenumbers of the empty waveguide are correspondingly perturbed. In this paper we present a reliable, effective and efficient method to obtain the perturbed propagation constants. It allows us to examine the inclusion of multiple strips aligned with the z-axis, with the potential for characterizing propagation in structures with a number of small strip inserts, metamaterial-filled waveguides and so on.

##### Keywords
Mathematical model, Propagation constant, Strips, Cutoff frequency, Transmission line matrix methods, Conductors, Australia
##### National Category
Electrical Engineering, Electronic Engineering, Information Engineering
##### Identifiers
urn:nbn:se:hig:diva-30884 (URN)10.1109/ICEAA.2019.8879114 (DOI)2-s2.0-85074937469 (Scopus ID)978-1-7281-0563-5 (ISBN)
##### Conference
2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), 9-13 September 2019, Granada, Spain
Available from: 2019-11-05 Created: 2019-11-05 Last updated: 2019-11-25Bibliographically approved
Cappello, B., Shestopalov, Y. & Matekovits, L. (2019). Analysis of the surface impedance of a sinusoidally modulated metasurface. In: 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA): . Paper presented at 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), 9-13 September 2019, Granada, Spain (pp. 0075-0077). IEEE
Open this publication in new window or tab >>Analysis of the surface impedance of a sinusoidally modulated metasurface
2019 (English)In: 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), IEEE, 2019, p. 0075-0077Conference paper, Published paper (Refereed)
##### Abstract [en]

Metasurfaces have been extensively exploited in recent years for mantle cloaking applications. In this type of problems it is of fundamental importance to determine the connection between the metasurface geometrical parameters and the realised value of surface impedance, in order to properly design the metasurface. In this paper the surface impedance of a non homogeneous metasurface, based on a sinusoidally modulated metallic pattern is analysed.

IEEE, 2019
##### Keywords
Impedance, Surface impedance, Dielectrics, Surface waves, Harmonic analysis, Scattering, Cloaking, metamaterials, periodic structures
##### National Category
Electrical Engineering, Electronic Engineering, Information Engineering
##### Identifiers
urn:nbn:se:hig:diva-30885 (URN)10.1109/ICEAA.2019.8879149 (DOI)2-s2.0-85074934092 (Scopus ID)978-1-7281-0563-5 (ISBN)
##### Conference
2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), 9-13 September 2019, Granada, Spain
Available from: 2019-11-05 Created: 2019-11-05 Last updated: 2019-11-25Bibliographically approved
Smirnov, Y., Smolkin, E. & Shestopalov, Y. (2019). Diffraction of a TE-Polarized Wave by a Nonlinear Goubau Line. Radio Science, 54(1), 151-157
Open this publication in new window or tab >>Diffraction of a TE-Polarized Wave by a Nonlinear Goubau Line
2019 (English)In: Radio Science, ISSN 0048-6604, E-ISSN 1944-799X, Vol. 54, no 1, p. 151-157Article in journal (Refereed) Published
##### Abstract [en]

The diffraction of a cylindrical wave by a nonlinear metal-dielectric waveguide filled with nonlinear medium is considered. Two widely used types of nonlinearities (Kerr nonlinearity and nonlinearity with saturation) are considered. The problem is to find amplitudes of the reflected and the transmitted fields when the amplitude of the incident field is known. The analytical and numerical solution techniques are developed. Numerical results are presented. ©2019. American Geophysical Union. All Rights Reserved.

##### Place, publisher, year, edition, pages
Blackwell Publishing Ltd, 2019
##### Keywords
nonlinear waveguide, numerical method, TE polarization, the diffraction problem, Dielectric waveguides, Numerical methods, Analytical and numerical solutions, Diffraction problem, Kerr nonlinearity, Nonlinear metals, Nonlinear waveguides, Numerical results, TE polarizations, Transmitted field, Diffraction
##### National Category
Mathematics Other Engineering and Technologies
##### Identifiers
urn:nbn:se:hig:diva-30478 (URN)10.1029/2018RS006629 (DOI)000458731300012 ()2-s2.0-85060646358 (Scopus ID)
Largescale
##### Funder
Swedish Institute
##### Note

Funding agencies:

- Ministry of Education and Science of the Russian Federation Grant no. 1.894.2017/4.6

- University of Gavle, Sweden

Available from: 2019-08-09 Created: 2019-08-09 Last updated: 2019-08-09Bibliographically approved
Khulbe, M., Tripathy, M. R., Parthasarathy, H., Shestopalov, Y. & Lagovsky, B. (2019). Inverse Scattering and Imaging Using Second Order Optical Nonlinearities. In: 2019 6th International Conference on Signal Processing and Integrated Networks, SPIN 2019: . Paper presented at 6th International Conference on Signal Processing and Integrated Networks, SPIN 2019, 7-8 March 2019, Noida, India (pp. 1086-1089). IEEE
Open this publication in new window or tab >>Inverse Scattering and Imaging Using Second Order Optical Nonlinearities
2019 (English)In: 2019 6th International Conference on Signal Processing and Integrated Networks, SPIN 2019, IEEE, 2019, p. 1086-1089Conference paper, Published paper (Refereed)
##### Abstract [en]

In this paper a mathematical technique is developed to find the parameters of a medium in terms of its scattered electromagnetic fields. Optical nonlinearity plays an important role in finding the scattering parameters of a medium. Using perturbation theory and nonlinear inverse scattering techniques with first order, second order and third order optical nonlinearity we find scattered electromagnetic fields. Using error minimization techniques parameters are estimated in term of permittivity and permeability up to second order. © 2019 IEEE.

IEEE, 2019
##### Keywords
Inverse scattering, least square estimation techniques, Optical nonlinearity, parameter extraction, permeability, permittivity, RF imaging, Electromagnetic fields, Electromagnetic wave diffraction, Mechanical permeability, Parameter estimation, Perturbation techniques, Signal processing, Least square estimation, Perturbation theory, Scattered electromagnetic fields, Second order optical nonlinearity, Third-order optical nonlinearities, Nonlinear optics
##### National Category
Signal Processing
##### Identifiers
urn:nbn:se:hig:diva-30501 (URN)10.1109/SPIN.2019.8711652 (DOI)000470844100209 ()2-s2.0-85066895033 (Scopus ID)9781728113791 (ISBN)
##### Conference
6th International Conference on Signal Processing and Integrated Networks, SPIN 2019, 7-8 March 2019, Noida, India
##### Note

Funding agency:

- DST, New Delhi INT/RUS/RFBR/P-341

Available from: 2019-08-15 Created: 2019-08-15 Last updated: 2019-08-22Bibliographically approved
Shestopalov, Y., Samokhin, A. & Samokhina, A. (2019). Iterative Gradient Descent Methods for Solving Linear Equations. Computational Mathematics and Mathematical Physics, 59(8), 1267-1274
Open this publication in new window or tab >>Iterative Gradient Descent Methods for Solving Linear Equations
2019 (English)In: Computational Mathematics and Mathematical Physics, ISSN 0965-5425, E-ISSN 1555-6662, Vol. 59, no 8, p. 1267-1274Article in journal (Refereed) Published
##### Abstract [en]

The paper presents the results on the use of gradient descent algorithms for constructing iterative methods for solving linear equations. A mathematically rigorous substantiation of the conver- gence of iterations to the solution of the equations is given. Numerical results demonstrating the effi- ciency of the modified iterative gradient descent method are presented.

##### Keywords
systems of linear algebraic equations, gradient descent, iterative methods
Mathematics
##### Identifiers
urn:nbn:se:hig:diva-30718 (URN)10.1134/S0965542519080141 (DOI)
Available from: 2019-10-03 Created: 2019-10-03 Last updated: 2019-10-04Bibliographically approved
Shestopalov, Y. (2019). Justification of mathematical imaging technique for the permittivity determination of layered dielectrics in a waveguide. In: 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA): . Paper presented at 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), 9-13 September 2019, Granada, Spain (pp. 0143-0146).
Open this publication in new window or tab >>Justification of mathematical imaging technique for the permittivity determination of layered dielectrics in a waveguide
2019 (English)In: 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2019, p. 0143-0146Conference paper, Published paper (Refereed)
##### Abstract [en]

An introduction to mathematical imaging technique for solving inverse scattering problems is given. Applications are considered to inverse waveguide problems of recontructing permittivity of layered dielectric inclusions. The solution is justified of the inverse microwave imaging by establishing one-to-one correspondence between the sought quantities and the measured noisy data.

##### Keywords
Permittivity, Frequency measurement, Permittivity measurement, Noise measurement, Imaging, Dielectrics, Inverse problems, inverse scattering, waveguide, layer, dielectric
##### National Category
Electrical Engineering, Electronic Engineering, Information Engineering
##### Identifiers
urn:nbn:se:hig:diva-30886 (URN)10.1109/ICEAA.2019.8879417 (DOI)2-s2.0-85074948304 (Scopus ID)978-1-7281-0563-5 (ISBN)
##### Conference
2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), 9-13 September 2019, Granada, Spain
Available from: 2019-11-05 Created: 2019-11-05 Last updated: 2019-11-25Bibliographically approved
Shestopalov, Y., Aboltins, A. & Litvinenko, A. (2019). Mathematical methods for inverse waveguide problems. In: 2019 IEEE Microwave Theory and Techniques in Wireless Communications  (MTTW). Proceedings: . Paper presented at 2019 IEEE Microwave Theory and Techniques in Wireless Communications (MTTW).
Open this publication in new window or tab >>Mathematical methods for inverse waveguide problems
2019 (English)In: 2019 IEEE Microwave Theory and Techniques in Wireless Communications  (MTTW). Proceedings, 2019Conference paper, Published paper (Refereed)
##### Abstract [en]

An introduction is given to mathematical methods for inverse waveguide  problems. Applications are considered to the solution of the inverse  waveguide problems of reconstructing permittivity of layered dielectric  inclusions. It is shown that the existence and uniqueness can be justified by  establishing one-to-one correspondence between the sought quantities and the  measured noisy data.

##### Keywords
mathematical methods; inverse waveguide problems; permittivity reconstruction; measured noisy data; layered dielectric inclusions
Mathematics
##### Identifiers
urn:nbn:se:hig:diva-31293 (URN)978-1-7281-4473-3 (ISBN)
##### Conference
2019 IEEE Microwave Theory and Techniques in Wireless Communications (MTTW)
Available from: 2019-12-13 Created: 2019-12-13 Last updated: 2019-12-13Bibliographically approved
Kimsis, K., Semenjako, J. & Shestopalov, Y. (2019). Mechanically tunable coupled resonator waveguide bandpass filter. In: 2019 IEEE Microwave Theory and Techniques in Wireless Communications (MTTW): . Paper presented at 2019 IEEE Microwave Theory and Techniques in Wireless Communications (MTTW), Riga, Latvia, 1-2 October 2019 (pp. 52-56). , 1
Open this publication in new window or tab >>Mechanically tunable coupled resonator waveguide bandpass filter
2019 (English)In: 2019 IEEE Microwave Theory and Techniques in Wireless Communications (MTTW), 2019, Vol. 1, p. 52-56Conference paper, Published paper (Refereed)
##### Abstract [en]

This paper proposes a novel mechanically tunable waveguide filter design, based on a coupled resonator topology. The resonator geometry consists of a rectangular waveguide cavity and a dielectric cylinder. Unlike conventional cylindrical resonators which are made out of a single part, here the cylinders are cut in half. By changing the distance between these two parts, the resonating frequency of the resonator can be changed, which allows for a tunable filter design. A filter using the proposed geometry has a large tuning bandwidth as well as relatively constant passband frequencies. The performance of the proposed filter is demonstrated by evaluating the filter using 3D simulation software CST Studio Suite.

##### Keywords
band-pass filters, rectangular waveguides, resonator filters, waveguide filters, coupled resonator topology, resonator geometry, rectangular waveguide cavity, dielectric cylinder, conventional cylindrical resonators, resonating frequency, mechanically tunable coupled resonator waveguide bandpass filter design, 3D simulation software CST studio suite, constant passband frequencies, Microwave filters, tunable filters, coupled resonator filters
##### National Category
Physical Sciences
##### Identifiers
urn:nbn:se:hig:diva-31174 (URN)10.1109/MTTW.2019.8897240 (DOI)2-s2.0-85075640411 (Scopus ID)
##### Conference
2019 IEEE Microwave Theory and Techniques in Wireless Communications (MTTW), Riga, Latvia, 1-2 October 2019
Available from: 2019-12-03 Created: 2019-12-03 Last updated: 2019-12-13Bibliographically approved
Shestopalov, Y., Smolkin, E. & Snegur, M. (2019). New Propagation Regimes of TE Waves in a Waveguide filled with a Nonlinear Dielectric Metamaterial. In: 2019 URSI Asia-Pacific Radio Science Conference (AP-RASC): . Paper presented at URSI AP-RASC 2019, 09 - 15 March 2019, New Delhi, India. New Dehli: IEEE, Article ID 8738241.
Open this publication in new window or tab >>New Propagation Regimes of TE Waves in a Waveguide filled with a Nonlinear Dielectric Metamaterial
2019 (English)In: 2019 URSI Asia-Pacific Radio Science Conference (AP-RASC), New Dehli: IEEE, 2019, article id 8738241Conference paper, Published paper (Refereed)
##### Abstract [en]

We consider propagation of surface TE waves in a circular metal-dielectric waveguide filled with nonlinear (Kerr nonlinearity) metamaterial medium. Analysis is reduced to solving a nonlinear transmission eigenvalue problem for an ordinary differential equation; eigenvalues of the problem correspond to propagation constants of the waveguide. For the numerical solution, a method is proposed based on solving an auxiliary Cauchy problem (a version of the shooting method). As a result of comprehensive numerical modeling, new propagation regimes are discovered.

##### Place, publisher, year, edition, pages
New Dehli: IEEE, 2019
##### Keywords
dielectric waveguides, differential equations, eigenvalues and eigenfunctions, electromagnetic wave propagation, optical metamaterials, optical waveguides, new propagation regimes, TE waves, nonlinear dielectric metamaterial, circular metal-dielectric waveguide, nonlinear metamaterial medium, Kerr nonlinearity, nonlinear transmission eigenvalue problem, ordinary differential equation, eigenvalues, problem correspond, propagation constants, auxiliary Cauchy problem, Electromagnetic waveguides, Dielectrics, Permittivity, Metamaterials, Electromagnetics, Electromagnetic scattering
##### National Category
Electrical Engineering, Electronic Engineering, Information Engineering Mathematics
##### Identifiers
urn:nbn:se:hig:diva-30555 (URN)10.23919/URSIAP-RASC.2019.8738241 (DOI)000491262700095 ()2-s2.0-85068617892 (Scopus ID)978-908-25987-5-9 (ISBN)978-908-25987-4-2 (ISBN)978-1-5386-8551-8 (ISBN)
##### Conference
URSI AP-RASC 2019, 09 - 15 March 2019, New Delhi, India
Available from: 2019-08-22 Created: 2019-08-22 Last updated: 2019-11-25Bibliographically approved
Shestopalov, Y., Smolkin, E. & Snegur, M. (2019). Numerical study of nonlinear metamaterial rod. In: 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA): . Paper presented at 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), 9-13 September 2019, Granada, Spain (pp. 0162-0164).
Open this publication in new window or tab >>Numerical study of nonlinear metamaterial rod
2019 (English)In: 2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2019, p. 0162-0164Conference paper, Published paper (Refereed)
##### Abstract [en]

We consider propagation of leaky and surface TE waves in the rod filled with nonlinear metamaterial medium. The physical setting is reduced to a transmission eigenvalue problem for an ordinary differential equation. The eigenvalues of the problem are the wave propagation constants. For the numerical solution, a method is proposed based on solving an auxiliary Cauchy problem (a version of the shooting method). As a result of comprehensive numerical modeling, new propagation regimes are discovered.

##### Keywords
Surface waves, Eigenvalues and eigenfunctions, Metamaterials, Optical surface waves, Optical waveguide theory, nonlinear metamaterial rod, Kerr nonlinearity, surface wave, leaky wave, numerical method
##### National Category
Electrical Engineering, Electronic Engineering, Information Engineering
##### Identifiers
urn:nbn:se:hig:diva-30883 (URN)10.1109/ICEAA.2019.8879337 (DOI)2-s2.0-85074917401 (Scopus ID)978-1-7281-0563-5 (ISBN)
##### Conference
2019 International Conference on Electromagnetics in Advanced Applications (ICEAA), 9-13 September 2019, Granada, Spain
Available from: 2019-11-05 Created: 2019-11-05 Last updated: 2019-11-25Bibliographically approved

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