Pub Date : 2015-10-15DOI: 10.1109/ICEAA.2015.7297186
B. Motz, A. Langwost, H. Kruger, T. Weiland
Field evaluations close to electrically large scattering structures are a demanding task for numerical simulation techniques. Based on a ray optical asymptotic method, we implement a technique for the fast calculation of a large amount of near field samples. The accuracy of the method is verified by comparing to the Mie field solution of a plane wave incident on a perfectly conducting sphere and analyzing its convergence for large radii of curvature. By using hardware acceleration, we achieve a considerable speedup compared to the CPU-only algorithm.
{"title":"Physical optics near field calculations on electrically large platforms","authors":"B. Motz, A. Langwost, H. Kruger, T. Weiland","doi":"10.1109/ICEAA.2015.7297186","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297186","url":null,"abstract":"Field evaluations close to electrically large scattering structures are a demanding task for numerical simulation techniques. Based on a ray optical asymptotic method, we implement a technique for the fast calculation of a large amount of near field samples. The accuracy of the method is verified by comparing to the Mie field solution of a plane wave incident on a perfectly conducting sphere and analyzing its convergence for large radii of curvature. By using hardware acceleration, we achieve a considerable speedup compared to the CPU-only algorithm.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115446610","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 : 2015-10-15DOI: 10.1109/ICEAA.2015.7297229
F. Reimann, U. van Rienen, P. Michel, U. Lehnert
Dielectrically lined waveguides are planned to be used as a passive wakefield dechirper for the electron beam at the ELBE[1] facility of the Helmholtz-Zentrum Dresden-Rossendorf. In this work we introduce the design of such a passive wakefield dechirper based on the analysis of dielectrically lined rectangular waveguides with a semi-analytical model developed at the University of Rostock. We conduct simulations to show the effect of the different tunings of the wakefield dechirper on a Gaussian beam comparable to the ELBE beam. Furthermore, we present an experimental structure planned at the ELBE facility to verify the calculated dechirping effect.
{"title":"A dielectrically lined rectangular waveguide as a wakefield dechirper for ELBE","authors":"F. Reimann, U. van Rienen, P. Michel, U. Lehnert","doi":"10.1109/ICEAA.2015.7297229","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297229","url":null,"abstract":"Dielectrically lined waveguides are planned to be used as a passive wakefield dechirper for the electron beam at the ELBE[1] facility of the Helmholtz-Zentrum Dresden-Rossendorf. In this work we introduce the design of such a passive wakefield dechirper based on the analysis of dielectrically lined rectangular waveguides with a semi-analytical model developed at the University of Rostock. We conduct simulations to show the effect of the different tunings of the wakefield dechirper on a Gaussian beam comparable to the ELBE beam. Furthermore, we present an experimental structure planned at the ELBE facility to verify the calculated dechirping effect.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122918783","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 : 2015-10-15DOI: 10.1109/ICEAA.2015.7297108
C. Bencivenni, M. Ivashina, R. Maaskant
In recent years, Compressive Sensing has attracted considerable attention in various areas of antennas and electromagnetics, including the synthesis of sparse array antennas. The CS synthesis of arrays achieves higher accuracy than analytical methods and allows for the fast and deterministic design of large complex arrays, without resorting to computationally expensive Global Optimization methods. The CS approach presented here has been previously studied by the authors for the design of maximally sparse arrays in the presence of mutual coupling effects, beam scanning degradation, as well as the imposition of symmetries for design modularity. In this manuscript the authors demonstrate another (yet unexplored) capability of such an approach, i.e., to incorporate different element types and determine their optimum combination in the course of the array synthesis procedure. Numerical examples are illustrated for large arrays comprising uniform circular aperture elements and operating in a SATCOM multi-beam scenario. It is shown that by exploiting this capability it is possible to simultaneously reduce the number of elements and gain scan loss.
{"title":"Multi-element aperiodic array synthesis by Compressive Sensing","authors":"C. Bencivenni, M. Ivashina, R. Maaskant","doi":"10.1109/ICEAA.2015.7297108","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297108","url":null,"abstract":"In recent years, Compressive Sensing has attracted considerable attention in various areas of antennas and electromagnetics, including the synthesis of sparse array antennas. The CS synthesis of arrays achieves higher accuracy than analytical methods and allows for the fast and deterministic design of large complex arrays, without resorting to computationally expensive Global Optimization methods. The CS approach presented here has been previously studied by the authors for the design of maximally sparse arrays in the presence of mutual coupling effects, beam scanning degradation, as well as the imposition of symmetries for design modularity. In this manuscript the authors demonstrate another (yet unexplored) capability of such an approach, i.e., to incorporate different element types and determine their optimum combination in the course of the array synthesis procedure. Numerical examples are illustrated for large arrays comprising uniform circular aperture elements and operating in a SATCOM multi-beam scenario. It is shown that by exploiting this capability it is possible to simultaneously reduce the number of elements and gain scan loss.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123182802","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 : 2015-10-15DOI: 10.1109/ICEAA.2015.7297355
S. Podilchak, G. Labate, L. Matekovits
In this article, a simple and practical design technique is proposed to control surface-waves (SWs) on dielectric substrates. In particular, by introducing a sub-wavelength square array of slots or patches within a conventional ground plane, SW fields can be controlled. An analysis of this new guide configuration is provided and results defining SW propagation along such an air-dielectric interface, grounded with an anisotropic high impedance surface, are studied. Our new approach for field control has applications to new routing circuits, leaky-wave antennas, and other planar structures which operate at microwave and millimeter-wave frequencies.
{"title":"Controlling surface waves by introducing anisotropy into the conductive backing of planar dielectric slabs","authors":"S. Podilchak, G. Labate, L. Matekovits","doi":"10.1109/ICEAA.2015.7297355","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297355","url":null,"abstract":"In this article, a simple and practical design technique is proposed to control surface-waves (SWs) on dielectric substrates. In particular, by introducing a sub-wavelength square array of slots or patches within a conventional ground plane, SW fields can be controlled. An analysis of this new guide configuration is provided and results defining SW propagation along such an air-dielectric interface, grounded with an anisotropic high impedance surface, are studied. Our new approach for field control has applications to new routing circuits, leaky-wave antennas, and other planar structures which operate at microwave and millimeter-wave frequencies.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116932044","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 : 2015-10-15DOI: 10.1109/ICEAA.2015.7297188
P. Tomášek, Y. Shestopalov, V. Kresálek
The goal of this theoretical study is the improvement of the techniques of determining electromagnetic permittivity. However, it may be developed and applied for the reconstruction of other parameters. The work is aimed at the preliminary design and implementation of a system solving inverse problem of reconstruction permittivities of materials consisting of several dielectric layers based on real measurements of the transmission and reflection coefficients in free space.
{"title":"Reconstruction of permittivity of multiple layers in free space","authors":"P. Tomášek, Y. Shestopalov, V. Kresálek","doi":"10.1109/ICEAA.2015.7297188","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297188","url":null,"abstract":"The goal of this theoretical study is the improvement of the techniques of determining electromagnetic permittivity. However, it may be developed and applied for the reconstruction of other parameters. The work is aimed at the preliminary design and implementation of a system solving inverse problem of reconstruction permittivities of materials consisting of several dielectric layers based on real measurements of the transmission and reflection coefficients in free space.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114653325","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 : 2015-10-15DOI: 10.1109/ICEAA.2015.7297278
G. Labate, P. Pirinoli, L. Matekovits
Characterization of cloaking, realized by conformal dielectric coatings on a fixed core cylinder and carried out through an Inverse Scattering Problem (ISP), is presented as the minimization process of a proper cost functional. In order to overcome the overall non-linearity issue of the inverse problem related to the data equation, the idea presented in this paper is to exploit the bilinear form of the ISP in two successive steps. The increase in the computational cost is compensated by an hybrid scheme with local search (i.e., CG-FFT) for finding the auxiliary variable (e.g., total field) and with global optimization algorithms (i.e., GA, SGA, BBO and PSO) for the main unknown of the inverse scattering problem (i.e., complex permittivity).
{"title":"Population-based algorithms applied to Inverse Scattering Problem for dielectric coatings","authors":"G. Labate, P. Pirinoli, L. Matekovits","doi":"10.1109/ICEAA.2015.7297278","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297278","url":null,"abstract":"Characterization of cloaking, realized by conformal dielectric coatings on a fixed core cylinder and carried out through an Inverse Scattering Problem (ISP), is presented as the minimization process of a proper cost functional. In order to overcome the overall non-linearity issue of the inverse problem related to the data equation, the idea presented in this paper is to exploit the bilinear form of the ISP in two successive steps. The increase in the computational cost is compensated by an hybrid scheme with local search (i.e., CG-FFT) for finding the auxiliary variable (e.g., total field) and with global optimization algorithms (i.e., GA, SGA, BBO and PSO) for the main unknown of the inverse scattering problem (i.e., complex permittivity).","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114549628","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 : 2015-10-15DOI: 10.1109/ICEAA.2015.7297329
S. Karki, C. Craeye
This paper focuses on the direct computation of the interactions between the Macro Basis Functions (MBFs) defined on distinct sub-domains using their complex patterns. They are computed using a set of inhomogeneous plane waves, which can be viewed as an extension of the Fast Inhomogeneous Plane Wave Algorithm (FIPWA), using a new spectral-domain sampling. Examples of slot antennas and 3D frustum array are used to validate the proposed method.
{"title":"Macro Basis Function interactions accelerated with the Inhomogeneous Plane Waves","authors":"S. Karki, C. Craeye","doi":"10.1109/ICEAA.2015.7297329","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297329","url":null,"abstract":"This paper focuses on the direct computation of the interactions between the Macro Basis Functions (MBFs) defined on distinct sub-domains using their complex patterns. They are computed using a set of inhomogeneous plane waves, which can be viewed as an extension of the Fast Inhomogeneous Plane Wave Algorithm (FIPWA), using a new spectral-domain sampling. Examples of slot antennas and 3D frustum array are used to validate the proposed method.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114780348","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 : 2015-10-15DOI: 10.1109/ICEAA.2015.7297079
G. Karagounis, D. De Zutter, D. Vande Ginste
We present a hybrid method that combines the Multilevel Fast Multipole Method (MLFMM) with the Uniform Theory of Diffraction (UTD) to model two-dimensional (2-D) scattering problems. The method is especially suited to model scattering in the presence of very large scatterers that obstruct the line-of-sight propagation between different devices with a more intricate geometry, such as antennas. The discretization of the large scatterers is avoided by using ray-based methods. An O(n) scaling is achieved for the computational time and required memory, n being the number of unknowns needed to discretize the antennas. The method is validated by a numerical example.
{"title":"An efficient 2-D MLFMM-UTD hybrid method to model non-line-of-sight propagation","authors":"G. Karagounis, D. De Zutter, D. Vande Ginste","doi":"10.1109/ICEAA.2015.7297079","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297079","url":null,"abstract":"We present a hybrid method that combines the Multilevel Fast Multipole Method (MLFMM) with the Uniform Theory of Diffraction (UTD) to model two-dimensional (2-D) scattering problems. The method is especially suited to model scattering in the presence of very large scatterers that obstruct the line-of-sight propagation between different devices with a more intricate geometry, such as antennas. The discretization of the large scatterers is avoided by using ray-based methods. An O(n) scaling is achieved for the computational time and required memory, n being the number of unknowns needed to discretize the antennas. The method is validated by a numerical example.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123968884","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 : 2015-10-15DOI: 10.1109/ICEAA.2015.7297291
John M. Arnold
The Jaynes-Cummings model of early quantum optics is examined from the point of view of a discrete-space discrete-time formulation of the electromagnetic field (the FDTD formulation) excited by an elementary quantum Hertzian dipole associated to a single edge of the discrete-space lattice. The quantum Hertz dipole is a natural 2-level atomic system, and the quantum dynamics of the electromagnetic field in the discrete space surrounding the dipole, described by functional integrals over field space, is essentially a stochastic (Monte-Carlo) algorithm for solving the FDTD equations by searching for the field distribution about which the field action Lagrangian functional S is stationary.
{"title":"Quantum optics and the discrete-space discrete-time Jaynes-Cummings model","authors":"John M. Arnold","doi":"10.1109/ICEAA.2015.7297291","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297291","url":null,"abstract":"The Jaynes-Cummings model of early quantum optics is examined from the point of view of a discrete-space discrete-time formulation of the electromagnetic field (the FDTD formulation) excited by an elementary quantum Hertzian dipole associated to a single edge of the discrete-space lattice. The quantum Hertz dipole is a natural 2-level atomic system, and the quantum dynamics of the electromagnetic field in the discrete space surrounding the dipole, described by functional integrals over field space, is essentially a stochastic (Monte-Carlo) algorithm for solving the FDTD equations by searching for the field distribution about which the field action Lagrangian functional S is stationary.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"295 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124274197","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 : 2015-10-15DOI: 10.1109/ICEAA.2015.7297298
W. Radasky
This paper reviews the threat of Intentional Electromagnetic Interference (IEMI) on commercial electronics and will describe the status of techniques to protect equipment from this threat. One of the most important means of protection is to provide electromagnetic shielding at the building, room or rack level. An example of an assessment approach will be shown in order to determine the amount of shielding required.
{"title":"The role of electromagnetic shielding in dealing with the threat of Intentional Electromagnetic Interference (IEMI)","authors":"W. Radasky","doi":"10.1109/ICEAA.2015.7297298","DOIUrl":"https://doi.org/10.1109/ICEAA.2015.7297298","url":null,"abstract":"This paper reviews the threat of Intentional Electromagnetic Interference (IEMI) on commercial electronics and will describe the status of techniques to protect equipment from this threat. One of the most important means of protection is to provide electromagnetic shielding at the building, room or rack level. An example of an assessment approach will be shown in order to determine the amount of shielding required.","PeriodicalId":277112,"journal":{"name":"2015 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"31 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123017289","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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