Pub Date : 2008-07-29DOI: 10.1109/MMET.2008.4580938
S. A. Malekabadi, S. M. Moghadasi
In this paper rectangular dielectric resonator antennas (RDRAs) which providing circular polarization (CP) using single probe feeds are studied. A new technique for CP achievement is presented. This technique proposed that by modifying the RDRAs in suitable way, the fundamental mode of conventional rectangular DRA splits into two near-degenerate orthogonal resonant modes and CP is obtained. The proposed antennas are numerically investigated using finite element method (FEM). The investigation indicates that the radiation patterns of all antennas are remaining broadside throughout the bandwidth.
{"title":"Circular Polarized Rectangular Dielectric Resonator Antenna using single probe feeds","authors":"S. A. Malekabadi, S. M. Moghadasi","doi":"10.1109/MMET.2008.4580938","DOIUrl":"https://doi.org/10.1109/MMET.2008.4580938","url":null,"abstract":"In this paper rectangular dielectric resonator antennas (RDRAs) which providing circular polarization (CP) using single probe feeds are studied. A new technique for CP achievement is presented. This technique proposed that by modifying the RDRAs in suitable way, the fundamental mode of conventional rectangular DRA splits into two near-degenerate orthogonal resonant modes and CP is obtained. The proposed antennas are numerically investigated using finite element method (FEM). The investigation indicates that the radiation patterns of all antennas are remaining broadside throughout the bandwidth.","PeriodicalId":141554,"journal":{"name":"2008 12th International Conference on Mathematical Methods in Electromagnetic Theory","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123727349","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 : 2008-07-29DOI: 10.1109/MMET.2008.4580894
N. Don, A. Kirilenko, A. Perov
Eigenoscillations of corresponding waveguide and periodic open resonators have been studied for explanation of the enhanced transmission through irregularities with below-cutoff holes. It has been found that the origin of the discovered effects is in the existence of the eigenoscillations of the interface between the free halfspace and the metal halfspace perforated with double-periodic set of channels or the eigenoscillations of waveguide plane junction.
{"title":"Enhanced transmission phenomenon from the eigenoscillation point of view","authors":"N. Don, A. Kirilenko, A. Perov","doi":"10.1109/MMET.2008.4580894","DOIUrl":"https://doi.org/10.1109/MMET.2008.4580894","url":null,"abstract":"Eigenoscillations of corresponding waveguide and periodic open resonators have been studied for explanation of the enhanced transmission through irregularities with below-cutoff holes. It has been found that the origin of the discovered effects is in the existence of the eigenoscillations of the interface between the free halfspace and the metal halfspace perforated with double-periodic set of channels or the eigenoscillations of waveguide plane junction.","PeriodicalId":141554,"journal":{"name":"2008 12th International Conference on Mathematical Methods in Electromagnetic Theory","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123201148","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 : 2008-07-29DOI: 10.1109/MMET.2008.4580973
O. Dumin, O. Dumina, V. Katrich
The transient radiation from the open end of a circular waveguide is considered by analytical and direct numerical methods. The radiation of short pulse from the aperture is considered by calculation of special time form of field by means of modal basis method. The method permits to solve the problem of pulse evolution for positive and negative time with the use of Laplace transform by construction of operator of propagation. The method of correction of pulse distortion on aperture is suggested on the base of properties of operator of propagation in waveguide. The control of pulse form of field on aperture is demonstrated.
{"title":"Transient radiation from the open end of circular waveguide","authors":"O. Dumin, O. Dumina, V. Katrich","doi":"10.1109/MMET.2008.4580973","DOIUrl":"https://doi.org/10.1109/MMET.2008.4580973","url":null,"abstract":"The transient radiation from the open end of a circular waveguide is considered by analytical and direct numerical methods. The radiation of short pulse from the aperture is considered by calculation of special time form of field by means of modal basis method. The method permits to solve the problem of pulse evolution for positive and negative time with the use of Laplace transform by construction of operator of propagation. The method of correction of pulse distortion on aperture is suggested on the base of properties of operator of propagation in waveguide. The control of pulse form of field on aperture is demonstrated.","PeriodicalId":141554,"journal":{"name":"2008 12th International Conference on Mathematical Methods in Electromagnetic Theory","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128657057","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 : 2008-07-29DOI: 10.1109/MMET.2008.4580958
Á. Miranda, V. Ponomaryov, L. N. de Rivera, R. Vazquez, M. Cruz‐Irisson
A semi-empirical tight-binding theory is employed to calculate the electronic band structure and the imaginary part of the dielectric function of crystalline diamond. Also, in order to validate the parameters used in this work, we have performed calculation by means of density functional theory with the local density approximation theory. We present the dependence of the dielectric function on the photon energy within two different approaches: interatomic and intra-atomic momentum matrix elements, which are applied and compared.
{"title":"Dielectric function in semi-empirical tight-binding theory applied to crystalline diamond","authors":"Á. Miranda, V. Ponomaryov, L. N. de Rivera, R. Vazquez, M. Cruz‐Irisson","doi":"10.1109/MMET.2008.4580958","DOIUrl":"https://doi.org/10.1109/MMET.2008.4580958","url":null,"abstract":"A semi-empirical tight-binding theory is employed to calculate the electronic band structure and the imaginary part of the dielectric function of crystalline diamond. Also, in order to validate the parameters used in this work, we have performed calculation by means of density functional theory with the local density approximation theory. We present the dependence of the dielectric function on the photon energy within two different approaches: interatomic and intra-atomic momentum matrix elements, which are applied and compared.","PeriodicalId":141554,"journal":{"name":"2008 12th International Conference on Mathematical Methods in Electromagnetic Theory","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126193197","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 : 2008-07-29DOI: 10.1109/MMET.2008.4580920
O. Drobakhin, A. V. Doronin
Neuron network technology application to subsurface air layer thickness estimation is considered. The envelope of time-domain signal was used as input data. The three-layered neuron network with backpropagation and sigmoid (S-shaped) activation function of neurons was chosen. The comparison with results of correlation method is presented.
{"title":"Estimation of thickness of subsurface air layer by neuron network technology application to reflected microwave signal","authors":"O. Drobakhin, A. V. Doronin","doi":"10.1109/MMET.2008.4580920","DOIUrl":"https://doi.org/10.1109/MMET.2008.4580920","url":null,"abstract":"Neuron network technology application to subsurface air layer thickness estimation is considered. The envelope of time-domain signal was used as input data. The three-layered neuron network with backpropagation and sigmoid (S-shaped) activation function of neurons was chosen. The comparison with results of correlation method is presented.","PeriodicalId":141554,"journal":{"name":"2008 12th International Conference on Mathematical Methods in Electromagnetic Theory","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122005385","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 : 2008-07-29DOI: 10.1109/MMET.2008.4580900
N. Ptitsyna, S. Shipman, S. Venakides
We investigate Fano-type anomalous transmission of energy of plane waves across lossless slab scatterers with periodic structure in the presence of non-robust guided modes. Our approach is based on rigorous analytic perturbation of the scattering problem near a guided mode and applies to very general structures, continuous and discrete.
{"title":"Fano resonance of waves in periodic slabs","authors":"N. Ptitsyna, S. Shipman, S. Venakides","doi":"10.1109/MMET.2008.4580900","DOIUrl":"https://doi.org/10.1109/MMET.2008.4580900","url":null,"abstract":"We investigate Fano-type anomalous transmission of energy of plane waves across lossless slab scatterers with periodic structure in the presence of non-robust guided modes. Our approach is based on rigorous analytic perturbation of the scattering problem near a guided mode and applies to very general structures, continuous and discrete.","PeriodicalId":141554,"journal":{"name":"2008 12th International Conference on Mathematical Methods in Electromagnetic Theory","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116738045","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 : 2008-07-29DOI: 10.1109/MMET.2008.4581056
N. Sydorchuk
In this paper the scattering characteristics are calculated with the technique based on the volume integral equations for polarization currents. Full-wave analysis is performed. A silicon-on-sapphire periodic structure is used to study the guided-mode resonances in plane-wave excitation conditions. Numerical computations for the reflection spectral resonances are presented for both weak and strong layer modulations. Spectral stability of resonances as a function of angle of incidence is investigated.
{"title":"Theoretical study of guided-mode resonances in planar doubly-periodic dielectric structures","authors":"N. Sydorchuk","doi":"10.1109/MMET.2008.4581056","DOIUrl":"https://doi.org/10.1109/MMET.2008.4581056","url":null,"abstract":"In this paper the scattering characteristics are calculated with the technique based on the volume integral equations for polarization currents. Full-wave analysis is performed. A silicon-on-sapphire periodic structure is used to study the guided-mode resonances in plane-wave excitation conditions. Numerical computations for the reflection spectral resonances are presented for both weak and strong layer modulations. Spectral stability of resonances as a function of angle of incidence is investigated.","PeriodicalId":141554,"journal":{"name":"2008 12th International Conference on Mathematical Methods in Electromagnetic Theory","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122271373","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 : 2008-07-29DOI: 10.1109/MMET.2008.4580998
E. Korchemkina, E. B. Shybanov, M.E. Lee
Method of satellite data correction, adjusting the standard atmospheric correction, is considered. Marine phytoplankton pigment concentrations were retrieved from SeaWiFS data using the correction proposed. Maps of chlorophyll distribution in region of Crimean South Coast were plotted, showing best correlation with biological data than when using standard methods.
{"title":"Improved method of remote sensing retrieval of sea water chlorophyll","authors":"E. Korchemkina, E. B. Shybanov, M.E. Lee","doi":"10.1109/MMET.2008.4580998","DOIUrl":"https://doi.org/10.1109/MMET.2008.4580998","url":null,"abstract":"Method of satellite data correction, adjusting the standard atmospheric correction, is considered. Marine phytoplankton pigment concentrations were retrieved from SeaWiFS data using the correction proposed. Maps of chlorophyll distribution in region of Crimean South Coast were plotted, showing best correlation with biological data than when using standard methods.","PeriodicalId":141554,"journal":{"name":"2008 12th International Conference on Mathematical Methods in Electromagnetic Theory","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126514306","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 : 2008-07-29DOI: 10.1109/MMET.2008.4580991
V. Morozov, V. Magro, V. Marmer
Using method of integral equations to solving three-dimensional diffraction problems are presented. The solution of three-dimensionally problem of radiation from longitudinal slot in wide wall of rectangular waveguide is considered.
介绍了用积分方程法求解三维衍射问题的方法。研究了矩形波导宽壁纵缝辐射的三维问题。
{"title":"Using method of integral equation on the base of cross region to solving three-dimentional difraction problems","authors":"V. Morozov, V. Magro, V. Marmer","doi":"10.1109/MMET.2008.4580991","DOIUrl":"https://doi.org/10.1109/MMET.2008.4580991","url":null,"abstract":"Using method of integral equations to solving three-dimensional diffraction problems are presented. The solution of three-dimensionally problem of radiation from longitudinal slot in wide wall of rectangular waveguide is considered.","PeriodicalId":141554,"journal":{"name":"2008 12th International Conference on Mathematical Methods in Electromagnetic Theory","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126734209","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 : 2008-07-29DOI: 10.1109/MMET.2008.4580964
S. Lyagushyn, Yu.M. Salyuk, A. Sokolovsky, Dnipropetrovs’k National University
The necessity of more thorough description of electromagnetic field is substantiated for the problems of quantum optics. An attempt to construct the correlation functions of emission generated by a superfluorescent system of Dicke type is done. Operator evolution equations for a system of two-level emitters interacting with electromagnetic field lead to quantum analogues of Maxwell equations. Reduced description method applied to the superfluorescent process allows to find parameters characterizing the field fluctuations and some generalizations of matter equations.
{"title":"Correlation properties of electromagnetic field generated by emitters with random orientation","authors":"S. Lyagushyn, Yu.M. Salyuk, A. Sokolovsky, Dnipropetrovs’k National University","doi":"10.1109/MMET.2008.4580964","DOIUrl":"https://doi.org/10.1109/MMET.2008.4580964","url":null,"abstract":"The necessity of more thorough description of electromagnetic field is substantiated for the problems of quantum optics. An attempt to construct the correlation functions of emission generated by a superfluorescent system of Dicke type is done. Operator evolution equations for a system of two-level emitters interacting with electromagnetic field lead to quantum analogues of Maxwell equations. Reduced description method applied to the superfluorescent process allows to find parameters characterizing the field fluctuations and some generalizations of matter equations.","PeriodicalId":141554,"journal":{"name":"2008 12th International Conference on Mathematical Methods in Electromagnetic Theory","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134018490","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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