Proceedings of the 9th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, 2004. DIPED 2004.最新文献
Pub Date : 2004-12-27DOI: 10.1109/DIPED.2004.242810
Y. Kunets’, V. Matus, V. V. Porochovs'kyj, V. O. Mishchenko
The inverse problem on the remote determination of the physical-mechanical parameters of thin plane tunnel elastic inclusions with variable thickness is considered. It is assumed that the mechanical properties of non-homogeneity and matrix differ insignificantly in comparison with the relative thickness of non-homogeneity. Elastic longitudinal waves are used as sounding waves, and the unknown parameters are defined according to the scattering amplitudes of these waves in the Fraunhofer zone.
{"title":"Remote determination of mechanical parameters of thin tunnel elastic inclusions","authors":"Y. Kunets’, V. Matus, V. V. Porochovs'kyj, V. O. Mishchenko","doi":"10.1109/DIPED.2004.242810","DOIUrl":"https://doi.org/10.1109/DIPED.2004.242810","url":null,"abstract":"The inverse problem on the remote determination of the physical-mechanical parameters of thin plane tunnel elastic inclusions with variable thickness is considered. It is assumed that the mechanical properties of non-homogeneity and matrix differ insignificantly in comparison with the relative thickness of non-homogeneity. Elastic longitudinal waves are used as sounding waves, and the unknown parameters are defined according to the scattering amplitudes of these waves in the Fraunhofer zone.","PeriodicalId":126782,"journal":{"name":"Proceedings of the 9th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, 2004. DIPED 2004.","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124850056","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 : 2004-12-27DOI: 10.1109/DIPED.2004.242565
F. Bogdanov, G. Kevanishvili, G. Jandieri, D. Kim
A rigorous electromagnetic theory is suggested to analyze multiport waveguide junctions with artificial discontinuities formed from an inductive strip and dielectric layer. The characteristics of these junctions in a broad parameter range are presented, and optimisation of their matching properties is performed.
{"title":"Simulation and optimization of waveguide junctions with artificial discontinuities including conducting strips and dielectric layer","authors":"F. Bogdanov, G. Kevanishvili, G. Jandieri, D. Kim","doi":"10.1109/DIPED.2004.242565","DOIUrl":"https://doi.org/10.1109/DIPED.2004.242565","url":null,"abstract":"A rigorous electromagnetic theory is suggested to analyze multiport waveguide junctions with artificial discontinuities formed from an inductive strip and dielectric layer. The characteristics of these junctions in a broad parameter range are presented, and optimisation of their matching properties is performed.","PeriodicalId":126782,"journal":{"name":"Proceedings of the 9th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, 2004. DIPED 2004.","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115516196","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 : 2004-12-27DOI: 10.1109/DIPED.2004.242802
D. Kumar, P. Pourush
A conventional 4×4 planar microstrip equilateral triangular array antenna (METAA) is designed on a NiAl biased ferrite substrate in the C-band (5 GHz) region. The antenna shows tunability in resonant frequency, bandwidth, and efficiency and radiation conductance on application of an external magnetic field normal to the plane of the array geometry. The radar cross-section (RCS) characteristics, especially the resonance behavior of the array with various bias conditions, are studied and compared to the case of an unbiased ferrite. It is investigated that the RCS can be moved with respect to frequency by changing the magnetic bias field. It is also found that magnetic losses affect the RCS at resonance significantly.
{"title":"Beam scanning characteristics of microstrip triangular array antenna on normally biased NiAl ferrite","authors":"D. Kumar, P. Pourush","doi":"10.1109/DIPED.2004.242802","DOIUrl":"https://doi.org/10.1109/DIPED.2004.242802","url":null,"abstract":"A conventional 4×4 planar microstrip equilateral triangular array antenna (METAA) is designed on a NiAl biased ferrite substrate in the C-band (5 GHz) region. The antenna shows tunability in resonant frequency, bandwidth, and efficiency and radiation conductance on application of an external magnetic field normal to the plane of the array geometry. The radar cross-section (RCS) characteristics, especially the resonance behavior of the array with various bias conditions, are studied and compared to the case of an unbiased ferrite. It is investigated that the RCS can be moved with respect to frequency by changing the magnetic bias field. It is also found that magnetic losses affect the RCS at resonance significantly.","PeriodicalId":126782,"journal":{"name":"Proceedings of the 9th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, 2004. DIPED 2004.","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129763678","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 : 2004-12-27DOI: 10.1109/DIPED.2004.242361
R. Zaridze, D. Karkashadze, A. Bijamov, I. Paroshina
The problem of contactless research of a dielectric object using a broadband (millimetric, submillimetric, infra-red or optical) signal is considered. A photonic crystal (PC) proves to be efficient as the core element of an integral microcircuit for optical control in optical contactless measurement systems. Based on a software package developed at LAE, the numerical model of a compact PC-based microcircuit has been developed. The basic circuit of the device, functional units, and model of a microchip are presented.
{"title":"Contactless photonic crystal microcircuit based method for dielectric body remote exploration","authors":"R. Zaridze, D. Karkashadze, A. Bijamov, I. Paroshina","doi":"10.1109/DIPED.2004.242361","DOIUrl":"https://doi.org/10.1109/DIPED.2004.242361","url":null,"abstract":"The problem of contactless research of a dielectric object using a broadband (millimetric, submillimetric, infra-red or optical) signal is considered. A photonic crystal (PC) proves to be efficient as the core element of an integral microcircuit for optical control in optical contactless measurement systems. Based on a software package developed at LAE, the numerical model of a compact PC-based microcircuit has been developed. The basic circuit of the device, functional units, and model of a microchip are presented.","PeriodicalId":126782,"journal":{"name":"Proceedings of the 9th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, 2004. DIPED 2004.","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120959109","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 : 2004-12-27DOI: 10.1109/DIPED.2004.242463
Y. Shepilko
The rigorous solution of the problem is presented. The boundary-value method is employed using the property of completeness of angular functions on the respective intervals. The scattered far-field (SFF) and back radar cross section (BRCS) of the structure are evaluated asymptotically. The scattered field characteristics in the case of an E-polarized plane wave are analyzed numerically with controlled accuracy. It is shown that a resonant increase of BRCS is observed when the cylinder is filled with dielectric.
{"title":"Scattering of E-polarized electromagnetic wave by dielectric-coated axially slotted cylinder","authors":"Y. Shepilko","doi":"10.1109/DIPED.2004.242463","DOIUrl":"https://doi.org/10.1109/DIPED.2004.242463","url":null,"abstract":"The rigorous solution of the problem is presented. The boundary-value method is employed using the property of completeness of angular functions on the respective intervals. The scattered far-field (SFF) and back radar cross section (BRCS) of the structure are evaluated asymptotically. The scattered field characteristics in the case of an E-polarized plane wave are analyzed numerically with controlled accuracy. It is shown that a resonant increase of BRCS is observed when the cylinder is filled with dielectric.","PeriodicalId":126782,"journal":{"name":"Proceedings of the 9th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, 2004. DIPED 2004.","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122058694","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 : 2004-12-27DOI: 10.1109/DIPED.2004.242682
Y. Sirenko, K. Sirenko
The outcome of a search for efficient and correct ways for the truncation of the computational domain in direct numerical methods that are used for the electrodynamic analysis of complex waveguide junctions is presented. The relevant mathematical problem is resolved rigorously, both for two-dimensional scalar model problems and for three-dimensional vector problems. We describe briefly only one typical three-dimensional situation. The peculiarities associated with a change to the analysis of other similar three- and two-dimensional vector and scalar problems are also covered.
{"title":"Strong formulation of open-space initial boundary-value problems in the form of closed ones for compact waveguide transformers","authors":"Y. Sirenko, K. Sirenko","doi":"10.1109/DIPED.2004.242682","DOIUrl":"https://doi.org/10.1109/DIPED.2004.242682","url":null,"abstract":"The outcome of a search for efficient and correct ways for the truncation of the computational domain in direct numerical methods that are used for the electrodynamic analysis of complex waveguide junctions is presented. The relevant mathematical problem is resolved rigorously, both for two-dimensional scalar model problems and for three-dimensional vector problems. We describe briefly only one typical three-dimensional situation. The peculiarities associated with a change to the analysis of other similar three- and two-dimensional vector and scalar problems are also covered.","PeriodicalId":126782,"journal":{"name":"Proceedings of the 9th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, 2004. DIPED 2004.","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128028006","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 : 2004-12-27DOI: 10.1109/DIPED.2004.242809
E. Belyavskiy, V. I. Chasnyk, Y.N. Strokovsky, S. Khotiaintsev
We have verified experimentally the theoretical predictions of our previous work (Belyavskiy, E.D. et al., IEEE Trans. Electron Devices, vol.48, no.8, p.1727-36, 2001) about the effect of electron beam alternating rotation on the parasitic backward-wave oscillation in the amplifier-type helix traveling-wave tube (TWT) under periodic permanent magnetic (PPM) focusing. We measured the backward-wave start-oscillation current as a function of the interaction length in a specially designed helix backward wave oscillator. The observed behavior is much closer to the predictions of our theory, than to theories that ignore the electron beam rotation. Our results can be used for improving the stability of the PPM-focused helix TWT with respect to parasitic backward-wave oscillation.
我们已经通过实验验证了我们之前工作的理论预测(Belyavskiy, E.D. et al.， IEEE Trans.)。电子器件，vol.48, no。电子束交变旋转对周期性永磁聚焦下放大型螺旋行波管寄生后向振荡的影响。我们在一个特殊设计的螺旋后向波振荡器中测量了后向波开始振荡电流与相互作用长度的关系。观察到的行为更接近于我们理论的预测，而不是忽略电子束旋转的理论。我们的研究结果可用于提高ppm聚焦螺旋行波管在寄生后波振荡方面的稳定性。
{"title":"Electron beam alternating rotation in periodic permanent magnet focusing field has an effect on parasitic backward-wave oscillation in helix traveling wave tube","authors":"E. Belyavskiy, V. I. Chasnyk, Y.N. Strokovsky, S. Khotiaintsev","doi":"10.1109/DIPED.2004.242809","DOIUrl":"https://doi.org/10.1109/DIPED.2004.242809","url":null,"abstract":"We have verified experimentally the theoretical predictions of our previous work (Belyavskiy, E.D. et al., IEEE Trans. Electron Devices, vol.48, no.8, p.1727-36, 2001) about the effect of electron beam alternating rotation on the parasitic backward-wave oscillation in the amplifier-type helix traveling-wave tube (TWT) under periodic permanent magnetic (PPM) focusing. We measured the backward-wave start-oscillation current as a function of the interaction length in a specially designed helix backward wave oscillator. The observed behavior is much closer to the predictions of our theory, than to theories that ignore the electron beam rotation. Our results can be used for improving the stability of the PPM-focused helix TWT with respect to parasitic backward-wave oscillation.","PeriodicalId":126782,"journal":{"name":"Proceedings of the 9th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, 2004. DIPED 2004.","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124758686","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 : 2004-12-27DOI: 10.1109/DIPED.2004.242461
H. Singh
The paper studies and analyzes scattering by some of the shapes that are most used to model targets. From simple shapes, like cylinder and cone, to the conically capped cylinder, different techniques are used to analyze the scattering phenomena. Results obtained are compared over a wide range of frequencies and aspect angles. These techniques include geometrical theory of diffraction, individual scattering center method, and caustic correction method. Results are found to be in good agreement for most aspect angles. One can conclude that the RCS values obtained by the caustic correction and individual scattering center methods are closer as compared to GTD.
{"title":"Comparative study of high frequency techniques in radar cross-section (RCS) estimation","authors":"H. Singh","doi":"10.1109/DIPED.2004.242461","DOIUrl":"https://doi.org/10.1109/DIPED.2004.242461","url":null,"abstract":"The paper studies and analyzes scattering by some of the shapes that are most used to model targets. From simple shapes, like cylinder and cone, to the conically capped cylinder, different techniques are used to analyze the scattering phenomena. Results obtained are compared over a wide range of frequencies and aspect angles. These techniques include geometrical theory of diffraction, individual scattering center method, and caustic correction method. Results are found to be in good agreement for most aspect angles. One can conclude that the RCS values obtained by the caustic correction and individual scattering center methods are closer as compared to GTD.","PeriodicalId":126782,"journal":{"name":"Proceedings of the 9th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, 2004. DIPED 2004.","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125063249","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 : 2004-12-27DOI: 10.1109/DIPED.2004.242566
A. D. Polishchuk
Modeling of electrostatic fields in environments with different characteristics leads to the necessity of solving jump boundary value problems for the Laplacian in R/sup 3/. The normal derivative jump problem in Hilbert space, the normal derivative elements of which have the jump through the boundary surface, has been considered (Nedelec, J.C. and Planchard, J., 1973). The solution of this problem was searched as a simple layer potential. We consider the searched function jump problem in Hilbert space, elements of which have the jump through the boundary surface. The conditions for a well-posed solution of the formulated problem are determinated. We suggest looking for the solution of this problem as the double layer potential. We define the conditions for the well-posed solution of the latter.
在具有不同特性的环境中对静电场进行建模，导致需要求解R/sup / 3中拉普拉斯算子的跳跃边值问题。研究了希尔伯特空间中的正规导数跳变问题，即其正规导数元素具有跳变过边界面的问题(Nedelec, J.C. and Planchard, 1973)。这个问题的解是作为一个简单的层势来寻找的。考虑希尔伯特空间中搜索函数跳跃问题，该问题中元素有跳越边界面的问题。确定了公式化问题的适定解的条件。我们建议用双层电势来解决这个问题。我们定义了后者的适定解的条件。
{"title":"Solution of searched function jump problem for the Laplacian in R/sup 3/ by means of double layer potential","authors":"A. D. Polishchuk","doi":"10.1109/DIPED.2004.242566","DOIUrl":"https://doi.org/10.1109/DIPED.2004.242566","url":null,"abstract":"Modeling of electrostatic fields in environments with different characteristics leads to the necessity of solving jump boundary value problems for the Laplacian in R/sup 3/. The normal derivative jump problem in Hilbert space, the normal derivative elements of which have the jump through the boundary surface, has been considered (Nedelec, J.C. and Planchard, J., 1973). The solution of this problem was searched as a simple layer potential. We consider the searched function jump problem in Hilbert space, elements of which have the jump through the boundary surface. The conditions for a well-posed solution of the formulated problem are determinated. We suggest looking for the solution of this problem as the double layer potential. We define the conditions for the well-posed solution of the latter.","PeriodicalId":126782,"journal":{"name":"Proceedings of the 9th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, 2004. DIPED 2004.","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124592874","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 : 2004-12-27DOI: 10.1109/DIPED.2004.242678
A. Kasyanov
Microwave reflective type antenna arrays and their possible applications are considered. The reflectarrays are shown to be most promising for smart cover design in the microwave band. Some numerical results are presented, which show the possibility of applying microstrip reflectarrays as smart covers for microwave modules.
{"title":"Focusing and controllable microstrip electrodynamic structures","authors":"A. Kasyanov","doi":"10.1109/DIPED.2004.242678","DOIUrl":"https://doi.org/10.1109/DIPED.2004.242678","url":null,"abstract":"Microwave reflective type antenna arrays and their possible applications are considered. The reflectarrays are shown to be most promising for smart cover design in the microwave band. Some numerical results are presented, which show the possibility of applying microstrip reflectarrays as smart covers for microwave modules.","PeriodicalId":126782,"journal":{"name":"Proceedings of the 9th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory, 2004. DIPED 2004.","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127885027","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：