Pub Date : 2014-05-14DOI: 10.1109/NEMO.2014.6995690
A. Tibaldi, R. Orta, O. Peverini, R. Tascone, G. Addamo, G. Virone
In this paper the development of a full-wave simulator of the scattering from a surface-relief diffraction grating is described. The general case of skew incidence, which leads to a vector differential problem, is addressed. First, the general mathematical formulation of the discretization scheme is introduced; then, a comparison with results obtained by the mode matching method is presented.
{"title":"Analysis of diffraction gratings by the mortar-element method","authors":"A. Tibaldi, R. Orta, O. Peverini, R. Tascone, G. Addamo, G. Virone","doi":"10.1109/NEMO.2014.6995690","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995690","url":null,"abstract":"In this paper the development of a full-wave simulator of the scattering from a surface-relief diffraction grating is described. The general case of skew incidence, which leads to a vector differential problem, is addressed. First, the general mathematical formulation of the discretization scheme is introduced; then, a comparison with results obtained by the mode matching method is presented.","PeriodicalId":273349,"journal":{"name":"2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)","volume":"149 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127645075","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 : 2014-05-14DOI: 10.1109/NEMO.2014.6995705
C. Carceller, F. J. Perez, J. Gil, C. Vicente, V. Boria, B. Gimeno, M. Guglielmi
In this paper, we present FEST3D, a powerful software tool capable of efficiently analyzing most passive components commonly used in space and ground applications. By combining different approaches of the Boundary Integral - Resonant Mode Expansion (BI-RME) method, this tool is able to perform an accurate EM modeling of components with complicated geometries in extremely short computational times (orders of magnitude less than software tools based on 3D segmentation techniques).
{"title":"A commercial EM solver using the BI-RME method","authors":"C. Carceller, F. J. Perez, J. Gil, C. Vicente, V. Boria, B. Gimeno, M. Guglielmi","doi":"10.1109/NEMO.2014.6995705","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995705","url":null,"abstract":"In this paper, we present FEST3D, a powerful software tool capable of efficiently analyzing most passive components commonly used in space and ground applications. By combining different approaches of the Boundary Integral - Resonant Mode Expansion (BI-RME) method, this tool is able to perform an accurate EM modeling of components with complicated geometries in extremely short computational times (orders of magnitude less than software tools based on 3D segmentation techniques).","PeriodicalId":273349,"journal":{"name":"2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130175363","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 : 2014-05-14DOI: 10.1109/NEMO.2014.6995666
J. Andrews, V. Mathew
We present a simulation methodology of propagation parameters and study their relationship with flux effects in a High Temperature Superconducting (HTS) Coplanar Waveguide placed in an external magnetic field. The impact of vortex dynamics on the electromagnetic signal propagation is clearly made out for a wide range of applied field, temperature and strip thickness. The vortex effects are incorporated by using a complex dynamic mobility term proposed by Coffey and Clem (CC) in their modified two-fluid theory. The dyadic Green's functions in Spectral Domain are formulated accordingly by treating the surface impedance derived from CC model as a complex resistive boundary condition. The thermal and field effects are incorporated into the analysis in a self-consistent manner using CC model. By using the Galerkin's procedure, the propagation parameters are computed using Müller root finding method. The inclusion of flux dynamics significantly alter the signal attenuation which, in turn, determines the quality factor. The signal dispersion is kept to a minimum and the relationship between flux effects and the microwave signal propagation is explored.
{"title":"Computation of flux effects in high temperature superconducting coplanar waveguide","authors":"J. Andrews, V. Mathew","doi":"10.1109/NEMO.2014.6995666","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995666","url":null,"abstract":"We present a simulation methodology of propagation parameters and study their relationship with flux effects in a High Temperature Superconducting (HTS) Coplanar Waveguide placed in an external magnetic field. The impact of vortex dynamics on the electromagnetic signal propagation is clearly made out for a wide range of applied field, temperature and strip thickness. The vortex effects are incorporated by using a complex dynamic mobility term proposed by Coffey and Clem (CC) in their modified two-fluid theory. The dyadic Green's functions in Spectral Domain are formulated accordingly by treating the surface impedance derived from CC model as a complex resistive boundary condition. The thermal and field effects are incorporated into the analysis in a self-consistent manner using CC model. By using the Galerkin's procedure, the propagation parameters are computed using Müller root finding method. The inclusion of flux dynamics significantly alter the signal attenuation which, in turn, determines the quality factor. The signal dispersion is kept to a minimum and the relationship between flux effects and the microwave signal propagation is explored.","PeriodicalId":273349,"journal":{"name":"2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126764369","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 : 2014-05-14DOI: 10.1109/NEMO.2014.6995724
Z. Stanković, N. Dončov, B. Milovanovic, J. Russer, I. Milovanovic
An efficient approach for determination of incoming direction of electromagnetic (EM) signals radiated from multiple stochastic sources in far-field is presented in this paper. The approach is based on using a neural model realized by the Multi-Layer Perceptron (MLP) artificial neural network. MLP neural model, successfully trained by using correlation matrix of signals sampled by receiving antenna array, can be used to accurately determine a direction of arrival (DOA) of radiated EM signals and afterward a location of each of multiple stochastic sources in azimuth plane. Presented model is suitable for real-time applications as it performs fast the DOA estimation. The model architecture, results of its training and testing as well as simulation results are described in details in the paper.
{"title":"Neural network approach for efficient DOA determination of multiple stochastic EM sources in far-field","authors":"Z. Stanković, N. Dončov, B. Milovanovic, J. Russer, I. Milovanovic","doi":"10.1109/NEMO.2014.6995724","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995724","url":null,"abstract":"An efficient approach for determination of incoming direction of electromagnetic (EM) signals radiated from multiple stochastic sources in far-field is presented in this paper. The approach is based on using a neural model realized by the Multi-Layer Perceptron (MLP) artificial neural network. MLP neural model, successfully trained by using correlation matrix of signals sampled by receiving antenna array, can be used to accurately determine a direction of arrival (DOA) of radiated EM signals and afterward a location of each of multiple stochastic sources in azimuth plane. Presented model is suitable for real-time applications as it performs fast the DOA estimation. The model architecture, results of its training and testing as well as simulation results are described in details in the paper.","PeriodicalId":273349,"journal":{"name":"2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)","volume":"4 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116260849","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 : 2014-05-14DOI: 10.1109/NEMO.2014.6995684
A. Nosich, O. Shapoval, I. Sukharevsky, A. Altintas
The two-dimensional (2D) scattering of the E and H-polarized plane electromagnetic waves by a free-standing thinner than the wavelength dielectric strip is considered numerically. Two methods are compared: singular integral equations (SIE) on the strip median line obtained from the generalized boundary conditions for a thin dielectric layer and Muller boundary integral equations (BIE) for arbitrarily thick strip. The comparison shows the domain of acceptable accuracy of approximate model derived for thin dielectric strips.
{"title":"Test of accuracy of the generalized boundary conditions in the scattering by thin dielectric strips","authors":"A. Nosich, O. Shapoval, I. Sukharevsky, A. Altintas","doi":"10.1109/NEMO.2014.6995684","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995684","url":null,"abstract":"The two-dimensional (2D) scattering of the E and H-polarized plane electromagnetic waves by a free-standing thinner than the wavelength dielectric strip is considered numerically. Two methods are compared: singular integral equations (SIE) on the strip median line obtained from the generalized boundary conditions for a thin dielectric layer and Muller boundary integral equations (BIE) for arbitrarily thick strip. The comparison shows the domain of acceptable accuracy of approximate model derived for thin dielectric strips.","PeriodicalId":273349,"journal":{"name":"2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116237851","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 : 2014-05-14DOI: 10.1109/NEMO.2014.6995657
L. Benkhaoua, M. T. Benhabiles, M. L. Riabi
A Meshless Time Domain Method is proposed to solve the telegrapher's equation for the Nonuniform Transmission Line. The approach is based on a combination of the Point Interpolation Method PIM and the Leapfrog algorithm. The accuracy of the proposed method is confronted with both the conventional FDTD and a wavelet expansion method. The strong stability of the computing scheme is set in evidence from the computational results for a linear tapered planar line.
{"title":"A meshless point interpolation method for time domain analysis of lossy nonuniform transmission lines","authors":"L. Benkhaoua, M. T. Benhabiles, M. L. Riabi","doi":"10.1109/NEMO.2014.6995657","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995657","url":null,"abstract":"A Meshless Time Domain Method is proposed to solve the telegrapher's equation for the Nonuniform Transmission Line. The approach is based on a combination of the Point Interpolation Method PIM and the Leapfrog algorithm. The accuracy of the proposed method is confronted with both the conventional FDTD and a wavelet expansion method. The strong stability of the computing scheme is set in evidence from the computational results for a linear tapered planar line.","PeriodicalId":273349,"journal":{"name":"2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)","volume":"255 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114602663","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 : 2014-05-14DOI: 10.1109/NEMO.2014.6995697
Dieter Dobbelaere, H. Rogier, D. De Zutter
Recent developments in high-speed interconnects show a clear tendency towards higher bitrates, emphasizing the need for a reliable prediction of the waveguide behavior. We present a frequency domain eigenmode analysis of isotropic waveguides using a boundary element method. Some properties of the dispersion curves can be beneficially leveraged into the numerical framework for calculating the waveguide characteristics as a function of frequency. The method allows the incorporation of highly conductive materials, which is demonstrated in a numerical example.
{"title":"Analytic properties of dispersion curves for efficient eigenmode analysis of isotropic waveguides using a boundary element method","authors":"Dieter Dobbelaere, H. Rogier, D. De Zutter","doi":"10.1109/NEMO.2014.6995697","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995697","url":null,"abstract":"Recent developments in high-speed interconnects show a clear tendency towards higher bitrates, emphasizing the need for a reliable prediction of the waveguide behavior. We present a frequency domain eigenmode analysis of isotropic waveguides using a boundary element method. Some properties of the dispersion curves can be beneficially leveraged into the numerical framework for calculating the waveguide characteristics as a function of frequency. The method allows the incorporation of highly conductive materials, which is demonstrated in a numerical example.","PeriodicalId":273349,"journal":{"name":"2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128463120","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 : 2014-05-14DOI: 10.1109/NEMO.2014.6995713
J. Russer, F. Mukhtar, Oliver Filonik, G. Scarpa, P. Russer
Stochastic electromagnetic fields with Gaussian amplitude probability distribution can be fully described by auto-and cross correlation spectra of the field components. The cross correlation spectra have to be known for the the pairs of field components taken at different spatial points. In this work we present a methodology for computing near- and far-field propagation of the stochastic electromagnetic field by transformation of the field correlation matrices using free-space Green's functions.
{"title":"Modelling of noisy EM field propagation using correlation information of sampled data","authors":"J. Russer, F. Mukhtar, Oliver Filonik, G. Scarpa, P. Russer","doi":"10.1109/NEMO.2014.6995713","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995713","url":null,"abstract":"Stochastic electromagnetic fields with Gaussian amplitude probability distribution can be fully described by auto-and cross correlation spectra of the field components. The cross correlation spectra have to be known for the the pairs of field components taken at different spatial points. In this work we present a methodology for computing near- and far-field propagation of the stochastic electromagnetic field by transformation of the field correlation matrices using free-space Green's functions.","PeriodicalId":273349,"journal":{"name":"2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129633423","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 : 2014-05-14DOI: 10.1109/NEMO.2014.6995689
G. Gentili, L. Accatino
This paper present a 2.5D FEM analysis of E-plane waveguide structures. A mixed formulation is used and the work is the basis of a more general analysis tool for 3D structures by 2.5D FEM. In order to verify the accuracy of the method, an E-plane low pass filter has been analyzed and the results have been compared with mode-matching and with measurements.
{"title":"A 2.5D FEM analysis of E-plane structures","authors":"G. Gentili, L. Accatino","doi":"10.1109/NEMO.2014.6995689","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995689","url":null,"abstract":"This paper present a 2.5D FEM analysis of E-plane waveguide structures. A mixed formulation is used and the work is the basis of a more general analysis tool for 3D structures by 2.5D FEM. In order to verify the accuracy of the method, an E-plane low pass filter has been analyzed and the results have been compared with mode-matching and with measurements.","PeriodicalId":273349,"journal":{"name":"2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122812646","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 : 2014-05-14DOI: 10.1109/NEMO.2014.6995717
F. Grimaccia, M. Mussetta, A. Niccolai, P. Pirinoli, R. Zich
In recent years there has been an increasing attention to novel evolutionary optimization techniques employed to engineering and real-world applications. Among these, the design of antennas and electromagnetic devices is a well-established field of application. This paper presents a new population based algorithm inspired by the recent explosion of social networks and their capability to drive people's decision making process in everyday life. Early experimental studies have already proven its effectiveness in the optimized design of EM structures. Here this optimization procedure called SNO - Social Network Optimization is presented and tested in a first comparative study to prove its effectiveness and performance compared with traditional evolutionary algorithms.
近年来，人们越来越关注应用于工程和实际应用的新型进化优化技术。其中，天线和电磁器件的设计是一个成熟的应用领域。本文提出了一种新的基于人口的算法，其灵感来自于最近社交网络的爆炸式增长及其驱动人们日常生活决策过程的能力。早期的实验研究已经证明了它在电磁结构优化设计中的有效性。本文提出了一种称为SNO - Social Network optimization的优化过程，并在第一次比较研究中进行了测试，以证明其与传统进化算法相比的有效性和性能。
{"title":"Recently developed social-based algorithms for antennas optimization","authors":"F. Grimaccia, M. Mussetta, A. Niccolai, P. Pirinoli, R. Zich","doi":"10.1109/NEMO.2014.6995717","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995717","url":null,"abstract":"In recent years there has been an increasing attention to novel evolutionary optimization techniques employed to engineering and real-world applications. Among these, the design of antennas and electromagnetic devices is a well-established field of application. This paper presents a new population based algorithm inspired by the recent explosion of social networks and their capability to drive people's decision making process in everyday life. Early experimental studies have already proven its effectiveness in the optimized design of EM structures. Here this optimization procedure called SNO - Social Network Optimization is presented and tested in a first comparative study to prove its effectiveness and performance compared with traditional evolutionary algorithms.","PeriodicalId":273349,"journal":{"name":"2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115149324","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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