Pub Date : 2006-10-01DOI: 10.1109/DIPED.2006.314286
G. Koshovy, A. G. Koshovy
The scattering problem of the E-polarized electromagnetic wave by pre-fractal system of cylindrical curvilinear strips has been formulated and solved for induced currents densities. The direct numerical method of mechanical quadratures (MQ-method) has been used successfully to find currents densities distribution on the strips in the case of the CSA-fractal's generator
{"title":"On Interaction Between the E-Polarized Electromagnetic Wave and the CSA-Pre-Fractals","authors":"G. Koshovy, A. G. Koshovy","doi":"10.1109/DIPED.2006.314286","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314286","url":null,"abstract":"The scattering problem of the E-polarized electromagnetic wave by pre-fractal system of cylindrical curvilinear strips has been formulated and solved for induced currents densities. The direct numerical method of mechanical quadratures (MQ-method) has been used successfully to find currents densities distribution on the strips in the case of the CSA-fractal's generator","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116867075","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 : 2006-10-01DOI: 10.1109/DIPED.2006.314292
V. Borulko
In this paper we consider phenomena of coupling of wave paraxial beam and quasisurface wave at perfectly conducting plane with segment of spatially oscillating surface impedance. Expansion in spatial harmonics that smoothly vary in longitudinal direction is used for presentation of transversal component of magnetic field. System of integral equations for complex amplitudes of spatial harmonics is obtained. Solutions for current distributions are found by method of moments. Angular patterns of scattering field are evaluated for different angles of incidence. Phenomenon of resonance increasing scattered beam is observed if quasisurface wave is excited. Proposed numeric method has advantages in cases of quasiperiodic structures with large number of "periods"
{"title":"Bragg Phenomena on Metal Plane with Section of Quasiperiodic Spatial Perturbation of Surface Impedance","authors":"V. Borulko","doi":"10.1109/DIPED.2006.314292","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314292","url":null,"abstract":"In this paper we consider phenomena of coupling of wave paraxial beam and quasisurface wave at perfectly conducting plane with segment of spatially oscillating surface impedance. Expansion in spatial harmonics that smoothly vary in longitudinal direction is used for presentation of transversal component of magnetic field. System of integral equations for complex amplitudes of spatial harmonics is obtained. Solutions for current distributions are found by method of moments. Angular patterns of scattering field are evaluated for different angles of incidence. Phenomenon of resonance increasing scattered beam is observed if quasisurface wave is excited. Proposed numeric method has advantages in cases of quasiperiodic structures with large number of \"periods\"","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114434626","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 : 2006-10-01DOI: 10.1109/DIPED.2006.314323
D. Karkashadze, L. Shoshiashvili, G. Ghvedashvili, D. Kakulia, G. Kajaia, T. Gogua
Imitating waveguide aperture (IWGA) source for FDTD modeling is introduced and studied. IWGA source's mathematical expression is sufficient approximation of the near field, radiated from the fiber waveguide, in the process of computer simulation of the EM phenomena in PhCs; it could be used as excited source expression by the fiber waveguide
{"title":"3D IWGA Source in FDTD Modeling","authors":"D. Karkashadze, L. Shoshiashvili, G. Ghvedashvili, D. Kakulia, G. Kajaia, T. Gogua","doi":"10.1109/DIPED.2006.314323","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314323","url":null,"abstract":"Imitating waveguide aperture (IWGA) source for FDTD modeling is introduced and studied. IWGA source's mathematical expression is sufficient approximation of the near field, radiated from the fiber waveguide, in the process of computer simulation of the EM phenomena in PhCs; it could be used as excited source expression by the fiber waveguide","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122673751","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 : 2006-10-01DOI: 10.1109/DIPED.2006.314277
D. Mazmanov, L. Manukyan, D. Kakulia, A. Razmadze, L. Shoshiashvili, R. Zaridze
In this paper software program package (SPP) for study of the wide class of the EM problems based on the method of auxiliary sources (MAS) solver is described. This SPP allows solving 3D diffraction and wave propagation problems, close to the real scenarios. This SPP based on MAS as mutually complementary together with FDTD solver will be implemented into FDTDLab
{"title":"MAS Based Software for the Solving of Diffraction and SAR Problems on Unbounded Objects","authors":"D. Mazmanov, L. Manukyan, D. Kakulia, A. Razmadze, L. Shoshiashvili, R. Zaridze","doi":"10.1109/DIPED.2006.314277","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314277","url":null,"abstract":"In this paper software program package (SPP) for study of the wide class of the EM problems based on the method of auxiliary sources (MAS) solver is described. This SPP allows solving 3D diffraction and wave propagation problems, close to the real scenarios. This SPP based on MAS as mutually complementary together with FDTD solver will be implemented into FDTDLab","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129081406","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 : 2006-10-01DOI: 10.1109/DIPED.2006.314319
Jr. Bijamov A, D. Kakuiia, G. Saparishvili, T. Gogua, D. Karkashadze, R. Zaridze
The need for computer aided design and numerical simulations for the devices and functional elements based on complex materials is discussed. A brief overview of the difficulties evolving while using traditional numerical methods is given. The rough extension of MAS algorithm that gives us the opportunity to simulate multi-node, complex-material based devices in real time with satisfactory precision is introduced
{"title":"Software for 3D Computer Simulation of Complex Material Based Devices","authors":"Jr. Bijamov A, D. Kakuiia, G. Saparishvili, T. Gogua, D. Karkashadze, R. Zaridze","doi":"10.1109/DIPED.2006.314319","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314319","url":null,"abstract":"The need for computer aided design and numerical simulations for the devices and functional elements based on complex materials is discussed. A brief overview of the difficulties evolving while using traditional numerical methods is given. The rough extension of MAS algorithm that gives us the opportunity to simulate multi-node, complex-material based devices in real time with satisfactory precision is introduced","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116657897","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 : 2006-10-01DOI: 10.1109/DIPED.2006.314303
I. I. Zinenko, V. Pyankov, V. Chumachenko
The domain-product technique and generalized scattering matrices are used to study radiation properties of a flanged sectoral horn with the parallel-plate waveguide feed. The structure incorporates dielectric slab pushed into the aperture. The excitation mechanism involves a TEM wave with the magnetic component along the generatrix
{"title":"Analysis of a Flanged Sectoral Horn Loaded with Dielectric Plug","authors":"I. I. Zinenko, V. Pyankov, V. Chumachenko","doi":"10.1109/DIPED.2006.314303","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314303","url":null,"abstract":"The domain-product technique and generalized scattering matrices are used to study radiation properties of a flanged sectoral horn with the parallel-plate waveguide feed. The structure incorporates dielectric slab pushed into the aperture. The excitation mechanism involves a TEM wave with the magnetic component along the generatrix","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115453533","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 : 2006-10-01DOI: 10.1109/DIPED.2006.314295
L. E. Berdzenishvili, E.B. Jakobia
As we have shown in a number of works, short-lived color centers (SLCC), formed in active elements in waveguide spoke-like lasers on neodymium-doped silicate glasses under the influence of short-wave (SW) part of spectrum of exciting lamp, cause a self-modulation of Q-factor with irradiation of regular giant pulses (GP) with repetition frequency up to 30 kHz. For further study and modeling of generation of spoke-like neodymium-doped lasers a determination of values of inductive losses in active laser element and its influence on parameters of generation is very important. In the present work an analysis of experimental results is conducted by means of kinetic equations of generation with presence of SLCC. Concentration of inductive losses ace induced by SLCC and its influence on duration Deltat and intensity I of GP is determined
{"title":"Study of Inductive Losses in Waveguide Spoke-Like Lasers on Neodymium-Doped Silicate Glasses","authors":"L. E. Berdzenishvili, E.B. Jakobia","doi":"10.1109/DIPED.2006.314295","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314295","url":null,"abstract":"As we have shown in a number of works, short-lived color centers (SLCC), formed in active elements in waveguide spoke-like lasers on neodymium-doped silicate glasses under the influence of short-wave (SW) part of spectrum of exciting lamp, cause a self-modulation of Q-factor with irradiation of regular giant pulses (GP) with repetition frequency up to 30 kHz. For further study and modeling of generation of spoke-like neodymium-doped lasers a determination of values of inductive losses in active laser element and its influence on parameters of generation is very important. In the present work an analysis of experimental results is conducted by means of kinetic equations of generation with presence of SLCC. Concentration of inductive losses ace induced by SLCC and its influence on duration Deltat and intensity I of GP is determined","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124152753","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 : 2006-10-01DOI: 10.1109/DIPED.2006.314301
B. Levin
The method of a calculation of a current phase increment in a two-layer microstrip antenna in comparison with an incident field phase and accordingly of a field phase step in a signal reradiation by a reflectarray element is offered. The field phase step depending on an antenna length and a capacity of the condenser, formed by a slot, cut in an antenna, is calculated
{"title":"Method of Calculation of Two-Layer Reflectarray with Microstrip Radiators","authors":"B. Levin","doi":"10.1109/DIPED.2006.314301","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314301","url":null,"abstract":"The method of a calculation of a current phase increment in a two-layer microstrip antenna in comparison with an incident field phase and accordingly of a field phase step in a signal reradiation by a reflectarray element is offered. The field phase step depending on an antenna length and a capacity of the condenser, formed by a slot, cut in an antenna, is calculated","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114939024","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 : 2006-10-01DOI: 10.1109/DIPED.2006.314309
C. Athanasiadis, N. Tsitsas
A layered scatterer with a soft or hard core is excited by a time harmonic spherical acoustic wave, generated by a point source located in the interior of the scatterer. Reciprocity and general scattering relations are established, relating the total, primary and secondary fields with the corresponding far field patterns. Moreover, we formulate the optical theorem, relating the scattering cross section with the field in the layer of the source
{"title":"Scattering Relations for Interior Acoustic Excitation of a Layered Obstacle with a Soft Or Hard Core","authors":"C. Athanasiadis, N. Tsitsas","doi":"10.1109/DIPED.2006.314309","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314309","url":null,"abstract":"A layered scatterer with a soft or hard core is excited by a time harmonic spherical acoustic wave, generated by a point source located in the interior of the scatterer. Reciprocity and general scattering relations are established, relating the total, primary and secondary fields with the corresponding far field patterns. Moreover, we formulate the optical theorem, relating the scattering cross section with the field in the layer of the source","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129905850","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 : 2006-10-01DOI: 10.1109/DIPED.2006.314307
O. Piddubniak, N. Piddubniak
The sound pulse radiation from a rotating elastic circular cylinder immersed in water (acoustic rototron) is studied. The transition and resonance characteristics of acoustic signals for the cases of radiator made from different materials are considered
{"title":"Pulse Radiation by Acoustic Rototron","authors":"O. Piddubniak, N. Piddubniak","doi":"10.1109/DIPED.2006.314307","DOIUrl":"https://doi.org/10.1109/DIPED.2006.314307","url":null,"abstract":"The sound pulse radiation from a rotating elastic circular cylinder immersed in water (acoustic rototron) is studied. The transition and resonance characteristics of acoustic signals for the cases of radiator made from different materials are considered","PeriodicalId":183082,"journal":{"name":"Proceedings of XIth International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic Acoustic Wave Theory","volume":"173 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131175564","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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