| 1. |
- Ivanchenko, Igor, et al.
(författare)
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Determination of effective permittivity of metamaterial antenna cells
- 2016
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Ingår i: 2016 10th European Conference on Antennas and Propagation. - : Institute of Electrical and Electronics Engineers (IEEE). - 9788890701863
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Konferensbidrag (refereegranskat)abstract
- A numerical-analytical method of reconstructing complex frequency-dependent permittivities is proposed. Measurements of the transmission coefficient for three typical metamaterial antenna units are performed and the frequency-dependent effective complex permittivity of the units is reconstructed in a wide frequency range.
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| 2. |
- Shestopalov, Yury, 1953-, et al.
(författare)
-
Analytical and numerical solution techniques for forward and inverse scattering problems in waveguides
- 2021
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Ingår i: Advances in Mathematical Methods for Electromagnetics. - Noida, Uttar Pradesh, India : IET: The Institution of Engineering and Technology. - 9781785613845 - 9781785613852 ; , s. 547-570
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Bokkapitel (refereegranskat)abstract
- Chapter: Investigations of the wave propagation in waveguides with inhomogeneous dielectric inclusions are performed using advanced analytical and numerical methods. A particular attention is paid to the analysis of benchmark problems: forward and inverse scattering by parallel-plane dielectric diaphragms and layered structures placed in a rectangular waveguide with perfectly conducting walls. A detailed study of the properties of transmitted fields using the theory of functions of one or several complex variables leads to the development of a technique aimed at reconstructing permittivity of the inclusions from the transmission coefficient. The unique solvability of this inverse problems is proved by establishing the domains where the transmission coefficient is a one-to-one function of permittivity and other problem parameters. The obtained results are used to improve FDTD numerical solution to the corresponding forward and inverse scattering problems for Maxwell’s equations in waveguides and create specifically developed codes. In general, the chapter contributes to the electromagnetic wave theory with several new findings and modified theoretical approaches.
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| 3. |
- Shestopalov, Yury, 1953-, et al.
(författare)
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Inverse problem method for permittivity reconstruction of two-layered media : numerical and experimental results
- 2014
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Ingår i: Progress in Electromagnetics Research Symposium. - : Electromagnetics Academy. - 9781934142288 ; , s. 2610-2613
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Konferensbidrag (refereegranskat)abstract
- This study employs the technique developed in [1-3] and deals with complex permittivity reconstruction of layered materials in the form of diaphragms (sections) in a single-mode waveguide of rectangular cross section from the transmission coefficient measured at different frequencies.
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| 4. |
- Shestopalov, Yury, 1953-, et al.
(författare)
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Permittivity reconstruction of a diaphragm in a rectangular waveguide : Unique solvability of benchmark inverse problems
- 2015
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Ingår i: PIERS 2015 Prague. - Cambridge, MA : The Electromagnetics Academy. - 9781934142301 ; , s. 1528-1532
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Konferensbidrag (refereegranskat)abstract
- This work is devoted to the analysis of inverse problems of permittivity reconstruction of diaphragms loaded in a rectangular waveguide including justification of the solution to a benchmark inverse problem of reconstructing permittivity of a one-sectional diaphragm. We perform comparison of theoretical and numerical results based on the measurement data to validate the efficiency of the proposed technique. The obtained solutions can be implemented in practical measurements for investigation of new artificial materials and media and can be applied in optics, nanotechnology, and design of microwave devices.
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| 5. |
- Smirnov, Yury, et al.
(författare)
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Frequency-Dependent Complex Permittivity Reconstruction of Layered Diaphragm in a Rectangular Waveguide : Comparison with Experiment
- 2014
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Ingår i: Proceedings of the 16<sup>th</sup> Seminar Computer Modeling in Microwave Power Engineering: Multiphysics Models and Material Properties. ; , s. 48-51
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Konferensbidrag (refereegranskat)abstract
- This study employs the technique developed in the earlier studies of the authors aimed atcomplex permittivity reconstruction of layered materials in the form of diaphragms (sections) in a single-mode waveguide of rectangular cross section from the transmission coefficient measured at different frequencies. The permittivity is assumed to be a function of frequency. We develop a numerical-analytical method of solution to this problem which guarantees accuracy of the result and can be easily implemented in view of practical measurements.Numerical results are presented for different types of materials.
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| 6. |
- Smirnov, Yury, et al.
(författare)
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Inverse problem method for complex permittivity reconstruction of layered media in a rectangular waveguide
- 2014
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Ingår i: Physica Status Solidi. C, Current topics in solid state physics. - : Wiley-VCH Verlagsgesellschaft. - 1610-1634 .- 1610-1642. ; 11:5-6, s. 969-974
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Tidskriftsartikel (refereegranskat)abstract
- We solve the inverse problem of finding frequency-dependent complex permittivity of a multi-sectional dielectric diaphragm in a waveguide of rectangular cross section from the transmission coefficient measured at different frequencies. Based on the developed recursive method we perform a detailed analysis for one-, two- and three sectional diaphragms
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| 7. |
- Smirnov, Yury, et al.
(författare)
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Solution to the Inverse Problem of Reconstructing Permittivity of an n-Sectional Diaphragm in a Rectangular Waveguide
- 2014. - Vol 85
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Ingår i: Algebra, Geometry and Mathematical Physics. - Berlin, Heidelberg : Springer Berlin/Heidelberg. - 9783642553608 - 9783642553615 ; , s. 555-566
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Konferensbidrag (refereegranskat)abstract
- We have developed a numerical-analytical method of solution to the inverse problem of reconstructing permittivities ofn-sectional diaphragms in a waveguide of rectangular cross section. For a one-sectional diaphragm, a solution in the closed form is obtained and the uniqueness is proved.
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