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Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)最新文献

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One class of waveguide resonators: algorithms based on semi-inversion technique in time and frequency domain 一类波导谐振器:基于时频半反转技术的算法
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.888531
N. Yashina
{"title":"One class of waveguide resonators: algorithms based on semi-inversion technique in time and frequency domain","authors":"N. Yashina","doi":"10.1109/MMET.2000.888531","DOIUrl":"https://doi.org/10.1109/MMET.2000.888531","url":null,"abstract":"An approach, based on extraction and analytical inversion of the singular part of the boundary value problem (BVP) operator in the frequency and time domain is applied to the one class of resonant structures in waveguides (coaxial type plane discontinuities bifurcation's, shunts, slots, irises, steps, disks etc.). Thus the initial BVP and BVP are reduced to the matrix equation of the second kind or to the Volterra integral equation of the second kind (with a straightforward scheme of time marching). All steps of the technique are mathematically proved. The convergence of numerical algorithms is proved also and estimated analytically. Special attention is paid to computer implementation of algorithms developed and various tests of them. Thus the convergence of numerical solutions is thoroughly investigated and analytical estimates are illustrated by numerical results.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131240843","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}
引用次数: 0
Transient radio wave scattering by aeration zones 瞬态无线电波散射的曝气区
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.888576
S. Masalov, O.O. Puzanov
{"title":"Transient radio wave scattering by aeration zones","authors":"S. Masalov, O.O. Puzanov","doi":"10.1109/MMET.2000.888576","DOIUrl":"https://doi.org/10.1109/MMET.2000.888576","url":null,"abstract":"It is shown that the availability of water can be detected only by reflection from a capillary fringe situated in a region contiguous with water. One has to take into account this result for a more exact determination of the water depth in ground. It has been established that the observed pulse acquires a duration above the source pulse. The calculation results have shown that measurement errors of frequency dependencies of permittivities and specific conductivities that are used as initial data manifest during the calculation of the diffraction fields for structures of large depth (that are more than 2-3 meters). This is a result of the small amplitudes of the pulses reflected from deep discontinuities. In fact these errors bring about a \"false reflection\" preceding reflections from the capillary fringe and water. This effect reveals a violation of the causality law and is a consequence of the disturbed connection between the real and imaginary parts of complex permittivity. As it is known, this connection is determined after the Kramers-Kronig relations. On this basis a conclusion is made about the necessity of refinement of the source experimental data.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132673651","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}
引用次数: 2
Two reflector non-symmetric shaped antenna systems 双反射面非对称形天线系统
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.888578
E. Hasanov
{"title":"Two reflector non-symmetric shaped antenna systems","authors":"E. Hasanov","doi":"10.1109/MMET.2000.888578","DOIUrl":"https://doi.org/10.1109/MMET.2000.888578","url":null,"abstract":"Two reflector antenna systems with non-symmetric reflecting surfaces under GO approximation are investigated. It is shown, that the problem of forming a desired far field pattern leads to solving the system of partial differential equations with respect to mapping functions between wave fronts. One of these equations is nonlinear and expresses the energy conversation law. It is shown that this equation can be solved separately in the class of non-smooth functions which has a discontinuity of the first kind along a given curve.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130377243","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}
引用次数: 0
Analysis method of the input impedance of a spiral antenna with given configuration 给定构型螺旋天线输入阻抗的分析方法
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.888580
M. Protsenko, I.V. Tankov, V.V. Gromozdin
{"title":"Analysis method of the input impedance of a spiral antenna with given configuration","authors":"M. Protsenko, I.V. Tankov, V.V. Gromozdin","doi":"10.1109/MMET.2000.888580","DOIUrl":"https://doi.org/10.1109/MMET.2000.888580","url":null,"abstract":"A method of analysis of the spiral antenna input impedance is presented. It is based on the generalized transmission line theory that accounts for the wave nature of the electromagnetic field. Application of the iterative analysis method of the equivalent transmission line is discussed for the adopted model. Numerical modeling and experimental results for the flat Archimedean spiral antenna input impedance are presented.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124326249","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}
引用次数: 0
3-D analysis of the compact cellular phone antennas 紧凑型手机天线的三维分析
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.888584
A. Bijamov, K. Tavzarashvili, R. Zaridze, G. Bit‐Babik
{"title":"3-D analysis of the compact cellular phone antennas","authors":"A. Bijamov, K. Tavzarashvili, R. Zaridze, G. Bit‐Babik","doi":"10.1109/MMET.2000.888584","DOIUrl":"https://doi.org/10.1109/MMET.2000.888584","url":null,"abstract":"Compact adaptive volume-resonant antennas with beam-steering capability can be employed in wireless applications. The described antennas can radiate the energy in a desired direction within a certain range of angles by changing the amplitudes and phases of feeding currents of the dipoles printed on the dielectric substrate with a conductive back surface. The improved efficiency entails a lower RF exposure of the user for equal power emitted compared to conventional cellular phone antennas. The 3-D method of integrated auxiliary sources is employed to study the performance of the presented antenna.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134244799","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}
引用次数: 0
Lidar signal model from remote aerosol formations in double scattering approach 双重散射方法下远程气溶胶形成的激光雷达信号模型
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.888573
V. Bryukhanova, I. V. Samokhvalov
{"title":"Lidar signal model from remote aerosol formations in double scattering approach","authors":"V. Bryukhanova, I. V. Samokhvalov","doi":"10.1109/MMET.2000.888573","DOIUrl":"https://doi.org/10.1109/MMET.2000.888573","url":null,"abstract":"Lidars are applied in many geophysics, meteorology and atmospheric optics research. However, the problem of lidar data interpretation is not solved yet. It is necessary to take into consideration the multiple scattering (MS) when laser radiation propagates in optically dense aerosol formations. The paper discusses the problem of numerical simulations of the lidar returns that account for contributions from single and double scattering from dense aerosol formations. We have analyzed the lidar equation that was obtained in Samokhvalov (1979) for an inhomogeneous atmosphere with account of single and double scattering. It is shown in the paper that double scattering \"forward-backward\" and \"backward-backward\" photon trajectories equally contribute to the backscattering intensity. This significantly simplifies the lidar equation, if the sounding pulse penetrates the cloud to the depth that is small compared with the diameter scattering volume at the cloud top.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122222674","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}
引用次数: 1
Nonlinear interaction of the waves in periodic semiconducting superlattice placed in a magnetic field 置于磁场中的周期性半导体超晶格中波的非线性相互作用
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.888607
A. Bulgakov, O.V. Shramkova
{"title":"Nonlinear interaction of the waves in periodic semiconducting superlattice placed in a magnetic field","authors":"A. Bulgakov, O.V. Shramkova","doi":"10.1109/MMET.2000.888607","DOIUrl":"https://doi.org/10.1109/MMET.2000.888607","url":null,"abstract":"The nonlinear interaction of the waves in layered-periodic semiconductor-dielectric superlattice located in a magnetic field is examined. For the theoretical investigations of the nonlinear processes we use the \"three-wave interaction\" procedure.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116001939","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}
引用次数: 0
Adiabatic invariants for electromagnetic waves guided by time-varying plasma structures 时变等离子体结构引导电磁波的绝热不变量
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.888525
M. Bakunov, V.B. Gildenburg, N. Zharova, S. N. Zhukov
{"title":"Adiabatic invariants for electromagnetic waves guided by time-varying plasma structures","authors":"M. Bakunov, V.B. Gildenburg, N. Zharova, S. N. Zhukov","doi":"10.1109/MMET.2000.888525","DOIUrl":"https://doi.org/10.1109/MMET.2000.888525","url":null,"abstract":"Propagation of an electromagnetic wave along a planar waveguiding structure containing gaseous/solid-state plasma slabs with time-varying free carrier density is considered in the case when the time-scale of density variations is much greater than the wave period. Both ionization and deionization (recombination, attachment) processes are included. General relations describing frequency shifting and energy losses of a guided wave are derived for arbitrary open/closed waveguiding structure. Adiabatic invariants, i.e., combinations of wave energy and frequency conserving in the course of temporal variations of the waveguiding medium, are found. Detailed analyses are given for surface waves guided by the boundary of a time-varying plasma half-space and a plasma slab.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"154 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115094417","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}
引用次数: 0
Accurate numerical solution of a diffraction problem for a non-equidistant axisymmetric structure consisting of circular disks 由圆盘组成的非等距轴对称结构的衍射问题的精确数值解
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.888556
A. N. Khizhnyak
{"title":"Accurate numerical solution of a diffraction problem for a non-equidistant axisymmetric structure consisting of circular disks","authors":"A. N. Khizhnyak","doi":"10.1109/MMET.2000.888556","DOIUrl":"https://doi.org/10.1109/MMET.2000.888556","url":null,"abstract":"Wave diffraction problems associated with electric dipole radiation in the presence of a finite non-equidistant array of circular perfectly conducting identical disks is considered. An axial dipole is placed on the axis of rotational symmetry. The aim of the work is to obtain a mathematically and numerically exact solution of the appropriate boundary problem. By using the moment method combined with a partial inversion of the problem operator, the problem reduces to numerically solving an infinite matrix equation set of the 2nd kind. The Fredholm nature of obtained equations ensures the existence of a unique solution.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"174 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116501108","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}
引用次数: 0
Signal compression based on zonal selection methods 基于区域选择方法的信号压缩
Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413) Pub Date : 2000-09-12 DOI: 10.1109/MMET.2000.888563
W. Dziech, R. Baran, D. Wiraszka
{"title":"Signal compression based on zonal selection methods","authors":"W. Dziech, R. Baran, D. Wiraszka","doi":"10.1109/MMET.2000.888563","DOIUrl":"https://doi.org/10.1109/MMET.2000.888563","url":null,"abstract":"Compression of signals in the spectral domain consists of the rejection of related transform coefficients and reconstruction of signals by inverse transforms. There exist two basic methods used to select coefficients to be transmitted: threshold selection and zonal selection. In threshold selection the reconstruction is made with a subset of coefficients that are larger than a specified threshold. In the zonal method the reconstruction is made with a subset of coefficients lying in a predetermined zone. Only those coefficients are selected for further processing, the remaining coefficients are set to zero. In this paper, zonal compression techniques performed on chosen signals using different transforms are investigated. The mean square error (MSE) is used as a measure of signal reconstruction quality. Plots of the MSE versus compression percentage are included for comparison of methods.","PeriodicalId":344401,"journal":{"name":"Conference Proceedings 2000 International Conference on Mathematical Methods in Electromagnetic Theory (Cat. No.00EX413)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115450365","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}
引用次数: 10
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