Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.最新文献

{"title":"A novel low-dispersive [2,2] finite difference method","authors":"C. Bommaraju, R. Schuhmann, T. Weiland","doi":"10.1109/CEMTD.2007.4373515","DOIUrl":"https://doi.org/10.1109/CEMTD.2007.4373515","url":null,"abstract":"The dispersion relation and convergence of a novel (2,2) modified finite-difference time-domain (MFDTD) method, which has fourth order convergence and excellent broadband characteristics, are presented. Accuracy of MFDTD is compared with that of standard FDTD and Fang (4,4) FDTD. The Convergence characteristics of the MFDTD and the FDTD are also furnished. We have presented MFDTD in 2-D in CEM-TD 2005. Here we extend MFDTD to 3-D.","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132570219","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":"Optimization of microwave structures with MEFISTO-3D NOVA and MATLAB","authors":"H. Chu, P. So, W. Hoefer","doi":"10.1109/CEMTD.2005.1531711","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531711","url":null,"abstract":"This paper introduces a flexible optimization procedure for microwave structures. The procedure is based on a seamless connection of the MATLAB optimization toolbox with MEFISTO-3D NOVA. Under this connection, MEFISTO-3D NOVA is used as an objective function server and the MATLAB optimization toolbox is used to adjust the geometric and constitutive parameters of the structure to obtain the target response.","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130127429","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":"A grid-enabled time domain transmission line matrix (TLM-G) system for the analysis of complex electromagnetic structures","authors":"Petr Lorenz, José Vagner, B. Biscontini, Peter Russer","doi":"10.1109/CEMTD.2005.1531709","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531709","url":null,"abstract":"A Grid-enabled time domain Transmission Line Matrix (TLM-G) system for full-wave analysis of complex electromagnetic structures is presented. The emerging Grid technology enables distributed EM simulation in a Virtual Organization (VO). The Virtual Organization is a dynamic collection of resources, individuals and institutions. The layout of the TLM-G system is presented and its scalability in terms of computational time is shown in several different examples.","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124220855","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":"A novel 2D FDTD scheme with isotropic dispersion characteristics and enhanced stability","authors":"I. Koh, Jung-Mi Lee, J. Yook","doi":"10.1109/CEMTD.2005.1531701","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531701","url":null,"abstract":"","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131035829","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":"System identification and model order reduction for TLM analysis of microwave components","authors":"D. Lukashevich, F. Coccetti, P. Russer","doi":"10.1109/CEMTD.2005.1531713","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531713","url":null,"abstract":"A System Identification (SI) and Prony's model based algorithm for the modelling and prediction of a time- domain transient response is introduced and applied to time- domain Transmission Line Matrix (TLM) transient responses in order to extrapolate parameters of microwave circuits and accelerate the simulation process. Application of moment matching Model Order Reduction (MOR) techniques to the TLM method is presented with empha- sis placed on Krylov subspace methods based on Lanczos process and its modifications. The Krylov subspace methods are attractive for MOR in the TLM framework because the construction of the orthonormal and biorthogonal bases used for the Krylov subspaces can be carried out through the direct application of the implicit TLM solver. MOR applied to the TLM method allows to generate a compact macromodel of the TLM-system and reduce the computational time. The advantages of the SI and MOR techniques and their comparison are demonstrated trough their applications to the analysis of a planar patch antenna.","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114292499","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":"A finite element time domain analysis of a broad frequency band antenna","authors":"B. Essakhi, L. Pichon","doi":"10.1109/CEMTD.2005.1531716","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531716","url":null,"abstract":"In electromagnetic wave propagation problems, it is usually necessary to compute the fields quantities over a broad frequency band. For such an nalysis a 3D time domain finite element approach provides an efficient approach. [1]. Such a model was developed in [2] in the context of microwaves cavities. The method solves the time-dependent vector wave equation and is based on tetrahedral edge elements for the electric filed interpolation. A Newmark scheme is used to approximate the time derivatives. The paper extends the work of [2] for antenna problems. The ability of the model is demonstrated in the case of a loop antenna for which the impedance is obtained as a function of frequency.","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126175945","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 use of Z-transforms in TLM with non uniform meshes","authors":"P. Saguet, H. Louazani, F. Ndagijimana","doi":"10.1109/CEMTD.2005.1531714","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531714","url":null,"abstract":"The use of Z-transforms in electromagnetic simulations using TLM when dispersive media are present, has been described by Christopoulos [Christopoulos-99] and its efficiency proven. This description concerned cubic meshes. This paper describes a generalization to non uniform meshes. We give the general formulation in this case. To validate our results we apply the algorithm to a gyromagnetic media where a Polder magnetic tensor is used and when this media is included in a rectangular waveguide to obtain non reciprocal effects (isolator). A comparison with experimental results obtained by Gardiol [2] is made. Introduction In order to model generalized materials, Paul et al. solve Maxwell's equations using TLM method in vacuum, considering the material wave interaction as voltage and current sources applied in the media.","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131313634","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":"General treatment of tlm node with embedded structures","authors":"K. Biwojno, C. Smartt, P. Sewell, Yafang Liu, C. Christopoulos","doi":"10.1109/CEMTD.2005.1531710","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531710","url":null,"abstract":"This contribution is an extension of the authors’ work in modelling multi-scale systems which is of great importance in many applications such as Electromagnetic Compatibility (EMC). By its very nature EMC analysis often requires consideration of systems characterized by many different physical scales, such as when thin wires, gaps and slots are present in large structures. In the Transmission Line Modelling (TLM) method of analysis, nodes that enable fine structures to be embedded within them have been demonstrated for special cases where the fields local to the object may be expanded in terms of analytically known local solutions [1-6]. The approach presented here differs in that it is based on purely numerical calculations of these local expansion and it therefore allows arbitrary structures for which analytical representations of local fields are unavailable, to be incorporated into TLM nodes. This enables the presence of general sub cell objects to be correctly and efficiently modelled in coarse grids. Results are presented for a canonical scattering problem in order to demonstrate the proposed procedure. Introduction Accurate and efficient modelling of electromagnetic fields becomes very challenging with increasing complexity and volume of the simulated systems. Particularly difficult to deal with are structures containing diverse physical geometries in which small structures have a significant effect on the overall response of the system. Such a multi-scale configuration is typical for Electromagnetic Compatibility (EMC) applications when fine features e.g. thin wires, slots and gaps are embedded within physically large bodies. In order to reliably characterise such a system these features must be included in the simulation models. The classical approach using dense meshing is often inefficient, if not beyond the available computational resources and therefore over the years substantial effort has been made to develop more suitable techniques. One approach to describing fine features that has already been given much attention is to use a special node modelling the effect of sub cell structure into a coarse mesh model [1-6]. A variety of examples for EMC predictions have already been shown using such techniques. A node with a straight metal wire placed in the centre has been demonstrated for the 2D [1,2] and 3D TLM methods [3]. Further extension in the 2D case has been demonstarted, mapping a node containing an arbitrarily positioned thin metal or dielectric post within a single cell into a TLM network [4]. Recently a 2D node that embeds an arbitrary number of wires of various dimensions and characteristics coupled by their near fields within a single cell has 0-7803-9544-1/05/$20.00 ©2005 IEEE 52 been described [5]. The important case of short lengths of thin wires which are obliquely oriented to the cell faces has also been illustrated [6] making it possible to simulate piecewise linear models of arbitrarily routed curved wires in 3D TLM.","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116207315","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 hybrid transmission line matrix - multipole expansion (TLMME) method for the modeling of electromagnetic structures in unbounded regions","authors":"P. Lorenz, P. Russer","doi":"10.1109/CEMTD.2005.1531712","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531712","url":null,"abstract":"The hybrid Transmission Line Matrix – Multipole Expansion (TLMME) method is focusing on potentially exact modeling of unbounded problems in time-domain electromagnetic computations based on the Transmission Line Matrix (TLM) method. In TLMME modeling the unbounded space is divided into two subregions, the spherical TLM region and the Multipole Expansion (ME) region. The connection between the subregions is found from the continuity condition of the tangetial field components and is modeled by a connection network. In this paper we describe the theoretical background of the TLMME method and give a numerical example of modeling of a patch antenna. Index Terms Time domain analysis, Transmission line matrix methods, Multipole expansion","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"178 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113953325","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":"Numerical technique for the analysis of patch antennas with MEMS-enabled moving parts","authors":"M. Kuroda, Kohei Yamagata, M. Tentzeris","doi":"10.1109/CEMTD.2005.1531718","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531718","url":null,"abstract":"For the design, optimization and realization of frequency selectable patch antennas , a numerical technique for the analysis of antennas with mechanically/MEMS-enabled moving parts is proposed. The accuracy of this technique is evaluated through the calculation of the numerical results that express the relation between the velocity of the moving part and the S11 parameters.","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127681956","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}