10th International Conference on Mathematical Methods in Electromagnetic Theory, 2004.最新文献

{"title":"Analysis of the 2D nonconcentric large reflector antenna-in-radome system: H-polarization case","authors":"T. Oğuzer","doi":"10.1109/MMET.2004.1397063","DOIUrl":"https://doi.org/10.1109/MMET.2004.1397063","url":null,"abstract":"2D nonconcentric reflector antenna-in-radome system is analyzed for H-polarization case. Rigorous formulation is performed depending on the MOR, Green's function and CSP methods. Larger geometries are solved in reasonable cpu times by using the FFT based algorithm in the computation of the Green's function.","PeriodicalId":300473,"journal":{"name":"10th International Conference on Mathematical Methods in Electromagnetic Theory, 2004.","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122010083","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}

{"title":"Influence of defects on electrodynamic properties of the finite series of identical metal-dielectric resonators","authors":"V.V. Khardiko, V. Tuz, V. Kazanskiy","doi":"10.1109/MMET.2004.1396948","DOIUrl":"https://doi.org/10.1109/MMET.2004.1396948","url":null,"abstract":"The series of N identical passing cylindrical resonators with thrcc layered axial-symmetric magnitodielecmc filling is considered. The lcngth of resonators is L , their radius is R, . Kcsonator includes the longitudinal frequent ( K = I / A << 1 , I period. A wavclength in free space) grating from perfect conducting rings. The radius of rings is R, . The grating is approximated by the cquivalcnt boundary conditions [I]. The rcsonitors are connected by the sections of homogeneous waveguide. The lcngth of section is L., radius is R, and parameters of filling is with c, . p, . The radius and parameters of filling of feeding waveguide are equal to corresponding parameters of resonator's rod. The investigated structure is excited by the TEOn-wave of the half-infinite homogeneous waveguide ( z S 0 ). The rcsonators and feeding waveguides. which length is L,. is basic elements. This work consider the frequency range in which all waves, except TEo, -wave, ol'connecting waveguide arc decayed. Thus the contribution of TEon -wave ( n > I ) is neglectfidly small. The equivalent circuit of investigatrd s\"Cwe in such approach, coordinate system, gwmcmc and material p m c t c r s of basic clement.. arc shoun in Fig. I The defect is modelled by the changing of the material or geometric parameters one of the basic elemcnts. In such case the vectors of amplitudes of incident (4 ) and reflection ( B , ) TEo -waves on input and output of the S ~ N C I U K are connectcd by the following relationship:","PeriodicalId":300473,"journal":{"name":"10th International Conference on Mathematical Methods in Electromagnetic Theory, 2004.","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121754820","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}

{"title":"Implementation of phase retrieval techniques for improving the results of phased array antennas near-field measurements","authors":"V. Markov, A. Filonenko","doi":"10.1109/MMET.2004.1396968","DOIUrl":"https://doi.org/10.1109/MMET.2004.1396968","url":null,"abstract":"Abstracf - To enhance the performance of existing near field antenna test facilities the idea of far field pattern determination using both the amplitude and phase measurements and the phaseless measurements techniques is proposed. In this way some difficulties related to precise phase measurements are overcome. The feasibility and the performance of the introduced techniques are shown through numerical examples. Both simulation and measurement results will be presented to demonstrate the utility of such approach. Comparison will be made behveen the antenna patterns calculated using traditional near field - far field (NF/FF) transformations, the phaseless measurements and the ones obtained by applying both the amplitude and phase measurements. The most widespread techniques for alignment and testing large phased array antennas (PAA) with electrically scanned beams are based on near field - far field (NF/FF) transformations. They requires the precise measurements of both the amplitude and the phase of the radiated near field on a prescribed surface. Whereas amplitude measurements are relatively easy to perform with sufficient accuracy, for phase measurements many problems arise. For obtaining precise phase information sophisticated equipment is required, which is more and more expensive as the frequency becomes higher and higher, considerably increasing the overall cost of the testing facility. In order to reduce these drawbacks of available NFiFF techniques and improve the performances of less expensive measurement set-ups, thus extending the usable frequency range, the idea of reconstructing the far field from only amplitude near field data has been proposed and successively developed for the planar scanning geometry [I4 This approach requires the knowledge of the near field amplitude data over two different surfaces and the solution is searched for in two steps. First, a near field complying with the available data is sought for. Next the transformation to the corresponding far field is performed by a standard technique. Recently, the use of phase retrieval techniques has been proposed for antenna diagnostics. Different kinds of developed approaches are essentially based on the retrieval of the phase distribution from the amplitude or from the squared amplitude of the measured field [5-9]. The main drawback of the amplitude only approach is related to the fact that it is essentially based on the retrieval of the phase of the measured field and thus involves the solution of a non-linear inverse problem. As a consequence, like the phase retrieval problem, the far-field determination from the amplitude only near-field data (especially corrupted) is an ill-conditioned problem, where solution is to be found by looking for a generalized solution which minimizes a proper functional. However, because the objective functional casually exhibits many local minima, the solution algorithm may be trapped in a false solution, thus making the corresponding nea","PeriodicalId":300473,"journal":{"name":"10th International Conference on Mathematical Methods in Electromagnetic Theory, 2004.","volume":"205 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131713450","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}

{"title":"Eigenmodes and resonant frequencies of multi-laver and multi-strip planar structures","authors":"I. Donets, A. Lerer, V. Lerer, G. Sinyavsky","doi":"10.1109/MMET.2004.1397116","DOIUrl":"https://doi.org/10.1109/MMET.2004.1397116","url":null,"abstract":"The numerical-analytical approach was developed for analysis of various multi-layer and multi-strip resonant and periodical planar structures. Shown, that approach has high accuracy and requires small computer resources.","PeriodicalId":300473,"journal":{"name":"10th International Conference on Mathematical Methods in Electromagnetic Theory, 2004.","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124443999","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}

{"title":"Quasioptical beamshaping utilizing analytical gradients","authors":"T. Magath","doi":"10.1109/MMET.2004.1396937","DOIUrl":"https://doi.org/10.1109/MMET.2004.1396937","url":null,"abstract":"A general synthesis method is proposed for the computation of quasioptical beamshapers. The method is based on the derivation of an analytical expmsion for the gradient to a predefined target functional. Using gradient information, a variable metric method for instance can be used to optimize the functional. The efficiency of the method is demonstrated in two examples; Fourier Gratings and a dual-offset configuration of reflectors are designed as quasioptical beamsplitters, respectively.","PeriodicalId":300473,"journal":{"name":"10th International Conference on Mathematical Methods in Electromagnetic Theory, 2004.","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114661928","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}

{"title":"Simulation of spectroscopic ellipsometry for dielectric lamellar gratings","authors":"K. Watanabe, J. Pistora, M. Foldyna, K. Postava, J. Vlček","doi":"10.1109/MMET.2004.1397097","DOIUrl":"https://doi.org/10.1109/MMET.2004.1397097","url":null,"abstract":"Spectroscopic ellipsometry for lamellar gratings made of lossless dielectric materials is numerically investigated by using the rigorous coupled-wave formulation based on Li¿s Fourier factorization rules. Accurate values of the ellipsometric angles are obtained with small number of Fourier components, and it is shown that accurate estimation of the grating parameters is possible in reasonable computation time.","PeriodicalId":300473,"journal":{"name":"10th International Conference on Mathematical Methods in Electromagnetic Theory, 2004.","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116387236","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}

{"title":"Electrodynamics of plasma oscillations in semiconductor microdevices with two-dimensional electron channels","authors":"V. Popov, O. Polischuk, G. M. Tsymbalov, M. Shur, W. Knap","doi":"10.1109/MMET.2004.1396936","DOIUrl":"https://doi.org/10.1109/MMET.2004.1396936","url":null,"abstract":"Electromagnetic theory of plasma oscillations in field-effect transistor with two-dimensional electron channel is presented. Two different key electromagnetic problems are considered. They are the problems of diffraction of the plane electromagnetic wave (i) on the slot in infinite perfectly conductive plane, which is bridged by 2D electron channel and (ii) on the perfectly conductive strip, which screens partially an infinite 2D electron sheet located at a given distance from the strip. New physics inherent in these problems is revealed.","PeriodicalId":300473,"journal":{"name":"10th International Conference on Mathematical Methods in Electromagnetic Theory, 2004.","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117237656","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}

{"title":"The second harmonic generation in E-plane waveguide on an inhomogeneous film with quadratic nonlinearity","authors":"V. Borulko","doi":"10.1109/MMET.2004.1397074","DOIUrl":"https://doi.org/10.1109/MMET.2004.1397074","url":null,"abstract":"An E-plane waveguide loaded by transversally inhomogeneous nonlinear film is considered. Effects of the second harmonic generation are theoretically investigated. System of nonlinear equations for amplitudes of time harmonics is obtained. Phenomenon of resonant increasing of amplitude of the higher harmonic caused by combination of nonlinearity and transversal inhomogeneity of the film is discovered. Reason of numeric instability is revealed. Ways for overcoming instability of numeric algorithm for \"optimal\" case are found.","PeriodicalId":300473,"journal":{"name":"10th International Conference on Mathematical Methods in Electromagnetic Theory, 2004.","volume":"388 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128405458","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}

{"title":"Backscattering from rain: data processing","authors":"V. Marchyk, I. Mazura, Y. Ostrovsky, F. Yanovsky","doi":"10.1109/MMET.2004.1396966","DOIUrl":"https://doi.org/10.1109/MMET.2004.1396966","url":null,"abstract":"This article is ahout new methods of data processing at using Doppler-polarimetric characteristics of wave reflected from scatterers in rain. New characteristics of turbulence are considered, such as differential Doppler velocity, the inclination angle tangent of the differential reflectivity, and others. Data processing algorithms are developed. Comparison of math models with measured data are done. I. INTRODUCTION Meteorological conditions always essentially influence the operation of aviation transport, especially safety, regularity and comfort of flight. They influence economic parameters of air companies and aeronautics as a whole. The intensity and quantity of aircraft in intemational traces increase stably. That is why the problem of flight safety arises as especially important. The modem plane flies along few thousand kilometers from departure point to arrival point. The flight may occur in difficult meteorological conditions. This factor is the main in aviation crashes; more than 45% of aviation accidents happen under the difficult meteorological conditions. That is why any new possibility to make prevention of severe weather during the flight is very urgent. This paper is devoted to processing new Doppler-polarimetric characteristics. These characteristics were theoretically considered in (6). Some comparison of measured parameters with the theory is done. We hope that new approach that is considered in this paper finally will lead to increase the reliability of revealing dangerous weather phenomenon such as shower rain, snow, turbulence, and others,","PeriodicalId":300473,"journal":{"name":"10th International Conference on Mathematical Methods in Electromagnetic Theory, 2004.","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127398888","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}

{"title":"Fractional curl operator in reflection problems","authors":"E. Veliev, N. Engheta","doi":"10.1109/MMET.2004.1396990","DOIUrl":"https://doi.org/10.1109/MMET.2004.1396990","url":null,"abstract":"The purpose of this paper is to investigate some applications of the fractionalized curl operator in the scattering problems. Using the technique of fractionalizing a linear operator we obtain the presentation for the fractional curl operator for the functions of hvo variables expressed via exponents. We use ibis presentation in a plane wave reflection at oblique incidence on an impedance infinite surface. Applying fractional curl operator to a fired solution we obtain the fields that describe, in certain sense, an intermediate of \"fractional\" solution behveen the original solution and its dual solution. These \"fractional\" fields represent the solution of reflection problem from an anisotropic surface. The relation behveen the impedance of such an anisotropic surface and the original impedance are presented in this paper.","PeriodicalId":300473,"journal":{"name":"10th International Conference on Mathematical Methods in Electromagnetic Theory, 2004.","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128917938","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}