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

{"title":"Time-domain scattering simulations using a high-order overset-grid approach","authors":"S. Sherer, M. Visbal","doi":"10.1109/CEMTD.2005.1531708","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531708","url":null,"abstract":"A parallel, high-order, overset-grid method is used to solve Maxwell’s equations in the timedomain. The approach utilizes high-order spatial differencing and filtering formulas, coupled with a fourth-order, explicit temporal algorithm. For demonstration and validation purposes, this approach is used to simulate plane-wave scattering from a perfect electrical conducing sphere. The method was found to be very accurate compared to 2nd-order FD/TD methods and shows great promise for predicting the scattering of high-frequency waves by complex shapes.","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"38 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":"124117019","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-volume, time-domain CEM code for unstructured-grids on parallel computers","authors":"J. Camberos, P. Wheat","doi":"10.1109/CEMTD.2005.1531707","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531707","url":null,"abstract":"We describe a general‐purpose finite‐volume, time‐domain electromagnetic solver. The objective of the effort began as a modification to an existing computational fluid dynamics code, Cobalt60, to solve the equations of electromagnetism. The existing framework for handling geometries with unstructured grids and the parallel computing capability made the code conversion convenient and timely. The code implements the solution of the Maxwell “curl” equations. Results for a perfectly conducting spherical surface are presented and compare favorably with theory and other electromagnetic solvers. Example results are presented for complex geometries and tests were performed for other benchmark geometries. Preliminary computational scalability results for the code indicate good parallel efficiency (not shown). It remains an open question whether codes based on time‐domain methods will become computationally efficient to compete with frequency‐domain solvers.","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"57 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":"126827362","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":"FDTD formulation for dispersive chiral media analysis using Z-transform","authors":"V. Demir, A. Elsherbeni, E. Arvas","doi":"10.1109/CEMTD.2005.1531699","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531699","url":null,"abstract":"A finite difference time-domain (FDTD) scattered-field formulation for dispersive chiral media is developed and presented. The FDTD formulation uses the Z transform method to model the frequency dependent dispersive nature of permittivity, permeability and chirality as well. The permittivity and permeability are assumed to follow the Lorentz model whereas the chirality is assumed to follow the Condon model. The formulation is developed for three-dimensional electromagnetic applications. Results of this formulation are presented for the co-polarization and cross-polarization of the reflected and transmitted waves from a chiral slab and for the scattered field from a chiral sphere, a chiral cube and a finite length chiral cylinder, due to normal incidence of a plane wave. Validation of the formulation is performed by comparing the results with those based on the exact solutions and those obtained from method of moments solutions. Introduction The electromagnetic wave propagation in chiral and bi-isotropic media has been modeled by the FDTD technique recently in various studies. These studies are based on various assumptions of constitutive relations of bi-isotropic and chiral media. Akyurtlu et al. extensively studied modeling bianisotropic media and its subclasses (e.g. biisotropic, chiral, isotropic) using the FDTD method. In [1] and [2], they incorporated the dispersive nature of permittivity, permeability and chirality in the FDTD formulation, thus providing a full dispersive model; frequency dependence of permittivity and permeability follows the Lorentzian model, wheras chirality follows the Condon model. Their studies are based on decomposing the electric and magnetic fields in the medium into wavefields; with which they treated the chiral medium problem as the sum of two problems in associated isotropic media. They verified the validity of their formulations by providing results for only one-dimensional problems. In this study, a dispersive chiral FDTD formulation is developed based on a direct implementation of the coupled chiral constitutive relations incorporated into Maxwell’s equations, unlike the ones presented in [1] and [2], which use the decoupled equations. The scattering of electromagnetic plane wave from three-dimensional dispersive chiral scatterers as well as the reflection and transmission from one-dimensional slab are presented. The dispersion of permittivity and permeability follows the Lorentzian model, wheras chirality follows the Condon model. These models are incorporated into the FDTD formulation using the Z transform method. The FDTD formulation is used to calculate transient reflected and transmitted fields from a chiral slab due to the incidence of a Gaussian TEM field. Furthermore, the formulation is used to calculate co-polarization and cross-polarization of the reflected and transmitted waves from a chiral slab and a chiral sphere due to an incident plane wave. Very good agreements are observed while comparing th","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"37 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":"133976351","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":"Nonlinear harmonic-balance (HB) and finite difference time domain (FDTD) co-simulation of a low-cost 24GHz DRO","authors":"L. Roselli, F. Alimenti, V. Palazzari, F. Placentino","doi":"10.1109/CEMTD.2005.1531724","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531724","url":null,"abstract":"This paper deals with the computer simulation of a low-cost Dielectric Resonator Oscillator (DRO) for 24GHz applications. The proposed approach is based on two separate steps. First, a Finite Difference Time Domain (FDTD) analysis of the DR-cavity structure is performed. Then, the obtained scattering matrix is inserted into a Harmonic Balance (HB) simulator and both the oscillation frequency and the output power are computed. This procedure has been carried-out using commercial software only, in order to assess an industrial-like design methodology.","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"36 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":"129249473","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":"Efficient PML formulations for truncating nonlinear FDTD domains","authors":"O. Ramadan","doi":"10.1109/CEMTD.2005.1531722","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531722","url":null,"abstract":"In this paper, efficient formulations of the Perfectly Matched Layer (PML) are presented for truncating Nonlinear Finite Difference Time Domain (FDTD) grids. The proposed scheme is based on the Z-transform theory and the stretched coordinates PML formulations. The formulations are validated through numerical example carried out in one dimensional domain which includes Lorentz dispersion as well as Kerr and Raman nonlinearities.","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"46 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121000555","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":"Comparative study of DSP techniques for the effective modeling and design of highly complex RF-MEMS structures","authors":"Jong-Hoon Lee, N. Bushyager, M. Tentzeris","doi":"10.1109/CEMTD.2005.1531719","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531719","url":null,"abstract":"Four DSP-based digital predictors (Prony's, covariance, forward-backward, matrix pencil), that are commonly used to enhance the time-domain modeling and design of highly complex RF MEMS structures, are evaluated in terms of computational efficiency and accuracy as a function of the model order, the decimating factor, and the size of sample train. For a benchmarking case of an RF MEMS tuner, it is found that while covariance method has the best performance in terms of accuracy matrix pencil method confers robustness to computational economies (less numerical effort) and saves more CPU time with a smaller model order that can be selected by easy and efficient criteria.","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"46 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":"129038657","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":"40 GHz metamaterial development using hybrid electromagnetic/statistical tools","authors":"D. Staiculescu, L. Martin, M. Tentzeris","doi":"10.1109/CEMTD.2005.1531725","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531725","url":null,"abstract":"The successful use of Design of Experiments (DOE) and Path of Ascent (POA) approaches in conjunction with time-domain full wave commercial simulators in a feasibility and design study of a metamaterial structure is presented. The frequency of interest is 40 GHz and the technology used is multilayer Low Temperature Cofired Ceramic (LTCC). The chosen approach for the Double Negative Metamaterial implementation is a loaded Coplanar Waveguide (CPW) transmission line. The design goals are a resonant frequency of 40 GHz and minimum insertion loss at that frequency. The electromagnetic performance of the loaded transmission line is simulated with a full wave time domain commercial simulator. The results of these simulations are incorporated into the DOE and POA techniques. First, the significant factors in achieving each of the goals are identified, then statistical models are developed for the two output variables and applied to optimize the structure.","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"3 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":"129597238","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 new hybrid method for analysing scattering problems","authors":"M. Harumatsu","doi":"10.1109/CEMTD.2005.1531723","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531723","url":null,"abstract":"A hybrid method that combines the Finite Difference Time Domain method (FDTD) and the Method of Moments in the Time Domain (MOM-TD) is presented. The use of equivalence theorem enables the calculation of interactions between these numerical methods. Some numerical techniques enhance the efficiency of calculations. The advantages of the hybrid method are a reduced computation time, memory efficiency and a smaller file size when applied to the problems with the sources distant from scatterers. Comparison between the hybrid method and the FDTD method is provided through numerical examples.","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"245 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":"114823687","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":"Predicted radiated emissions of systems according to the EMC standards with a time-domain EMI measurement system","authors":"S. Braun, P. Russer","doi":"10.1109/CEMTD.2005.1531715","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531715","url":null,"abstract":"Measurements for full compliance tests according to the EMC standards FCC, CISPR and MIL have to be performed with EMI-Receivers that must show the behavior as given in the standards. In order to predict the electromagnetic interference of a system field simulations are performed in frequencyand time-domain. Today complex systems like computer mainboards or automotive systems consist of various components that show a emission that could be described by statistical models. We have presented a Time-domain EMI (TDEMI) Measurement System that observes the input signal and generates a statistical model. This model is used to obtain a spectrum that can be evaluated under the various detector modes of an EMI Receiver. The TDEMI System reduces the measurement time by about a factor of 50. In this paper it is shown that the Time-domain EMI Measurement system allows to predict electromagnetic interference of a system consisting of several characterized components. A statistical model of the emission of each source and a model of coupling is used to obtain a statistical model that describes the complete system. The statistical model of the emission of a single source can be obtained by measurements or system level simulations. The coupling model is obtained by field solving tools. The resulting statistical model of the complete system is used to obtain a spectrum that can be evaluated under peak, quasi-peak, average and rms detector. Measurements have been performed with drill machine and a laptop as an example of a system consisting of two sources in the frequency range 30 MHz-1 GHz.","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"30 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":"126593443","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":"Nonlinear PMI equations and their embedding into the FDTD framework","authors":"S. Abarbanel, E. Kashdan","doi":"10.1109/CEMTD.2005.1531720","DOIUrl":"https://doi.org/10.1109/CEMTD.2005.1531720","url":null,"abstract":"Since introduced by Berenger [1], the Perfectly Matched Layers (PML) has become a popular approach for nonreflecting Artificial Boundary Conditions (ABC) in the numerical solution of the time-dependent Maxwell equations on unbounded domains. All PML algorithms double the number of equations to be solved inside the artificial domain in Cartesian coordinates in 3D. Experimental observations and theoretical studies also show that in some cases the implementation of the PML leads to temporal growth of the reflections into the physical domain or (and) instabilities. In this work we present nonlinear PML equations which are strictly well posed, temporally stable, and do not require the solution of additional equations in the artificial domain. The combination of the nonlinear PML with the standard Yee algorithm allows its implementation into production codes without significant modifications. Numerical experiments show effectiveness of the nonlinear PML in both 2D and 3D simulations.","PeriodicalId":407683,"journal":{"name":"Workshop on Computational Electromagnetics in Time-Domain, 2005. CEM-TD 2005.","volume":"15 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":"121099244","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}