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2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)最新文献

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An efficient way to determine stability and find solutions of the late-time currents for the time-domain electric-field integral-equation based march-on-time method 基于时域电场积分方程的随时间进行法是一种确定后时间电流稳定性和求解后时间电流的有效方法
2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO) Pub Date : 2014-05-14 DOI: 10.1109/NEMO.2014.6995709
Jinyan Li, Yanwen Zhao, Z. Chen
{"title":"An efficient way to determine stability and find solutions of the late-time currents for the time-domain electric-field integral-equation based march-on-time method","authors":"Jinyan Li, Yanwen Zhao, Z. Chen","doi":"10.1109/NEMO.2014.6995709","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995709","url":null,"abstract":"An efficient method to determine stability and find solutions of the late-time currents is proposed for the time-domain electric field integral equation (TDEFIE) based marching-on-time (MOT) technique. With it, a simple formula is derived to find late-time currents and eigenvalues of the coefficient matrix that then determine the stability of the TDEEFIE method. Numerical examples are then provided to show the effectiveness and accuracy of the proposed method.","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":"132748600","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}
引用次数: 0
X-parameter based GaN device modeling and its application to a high-efficiency PA design 基于x参数的GaN器件建模及其在高效PA设计中的应用
2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO) Pub Date : 2014-05-14 DOI: 10.1109/NEMO.2014.6995691
Yelin Wang, T. Nielsen, O. K. Jensen, T. Larsen
{"title":"X-parameter based GaN device modeling and its application to a high-efficiency PA design","authors":"Yelin Wang, T. Nielsen, O. K. Jensen, T. Larsen","doi":"10.1109/NEMO.2014.6995691","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995691","url":null,"abstract":"X-parameters are supersets of S-parameters and applicable to both linear and nonlinear system modeling. In this paper, a packaged 6 W Gallium Nitride (GaN) RF power transistor is modeled using load-dependent X-parameters by simulations. During the device characterization the load impedance is tuned only up to the 2nd-order harmonic. However, it proves that the model can still accurately approximate the behavior of the transistor under impedance tuning up to the 3rd-order harmonic. The simulation results preliminarily validate the concept of utilizing the X-parameter based modeling technique to decrease the complexity of a harmonic load-pull measurement setup. A high-efficiency 2 GHz power amplifier is also designed for further validation of the concept.","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":"131287357","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}
引用次数: 6
MATNEC: An in-house developed tool for electromagnetic simulation and evolutionary optimization of wire antennas MATNEC:一个内部开发的工具，用于电磁模拟和有线天线的进化优化
2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO) Pub Date : 2014-05-14 DOI: 10.1109/NEMO.2014.6995661
S. Zhao, C. Fumeaux, T. Fickenscher
{"title":"MATNEC: An in-house developed tool for electromagnetic simulation and evolutionary optimization of wire antennas","authors":"S. Zhao, C. Fumeaux, T. Fickenscher","doi":"10.1109/NEMO.2014.6995661","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995661","url":null,"abstract":"Various techniques of numerical electromagnetic computation have been widely used for decades in the design of antennas. In particular, the Numerical Electromagnetic Code was developed based on the method of moments to solve integral equations for current distributions, and thus, it is particularly efficient for the modeling and analysis of wire antennas and other metal structures. The computation load can, however, increase significantly with the increase of complexity in structure modeling. Radial basis functions are employed for geometry description to ease such burden by representing structural variations with a minimal number of variables. Evolutionary optimizations are used to explore a wider solution space in a timely manner in the pursuit of near-optimal solution in a multivariable environment. An in-house tool called MATNEC integrating modeling, simulation, analysis, and optimization is developed, which can successfully deliver near-optimal solutions under a pre-defined fitness function, considering both antenna efficiency and bandwidth. Helical antennas with variations in radius and pitch are successfully optimized, which effectively verifies the robustness of MATNEC and methodology applied.","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":"129687545","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}
引用次数: 2
Efficient calculation of modes and couplings of circular multiridge waveguide 圆多脊波导模式和耦合的有效计算
2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO) Pub Date : 2014-05-14 DOI: 10.1109/NEMO.2014.6995715
A. Morini, G. Venanzoni
{"title":"Efficient calculation of modes and couplings of circular multiridge waveguide","authors":"A. Morini, G. Venanzoni","doi":"10.1109/NEMO.2014.6995715","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995715","url":null,"abstract":"This paper shows once more the accuracy and effectiveness of the Boundary Integral-Resonant Mode Expansion method in problems involving empty waveguides with nonstandard section and, in particular, multiridge waveguides. First, the high accuracy of the technique is proven through comparison with exact results, obtained in the case of sectorial waveguides. Then, the effectiveness of the method in the solution of discontinuity problems is shown through the example of a quadriridge dielectric-less transformer, designed to match a Faraday rotator to a circular waveguide.","PeriodicalId":273349,"journal":{"name":"2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)","volume":"59 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":"130518750","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}
引用次数: 0
Robustness analysis of simultaneous determination method of complex permittivity and permeability 复介电常数和渗透率同时测定方法的鲁棒性分析
2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO) Pub Date : 2014-05-14 DOI: 10.1109/NEMO.2014.6995696
Mohamad Shaiful Bin Abdul Karim, Y. Konishi, T. Kitazawa
{"title":"Robustness analysis of simultaneous determination method of complex permittivity and permeability","authors":"Mohamad Shaiful Bin Abdul Karim, Y. Konishi, T. Kitazawa","doi":"10.1109/NEMO.2014.6995696","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995696","url":null,"abstract":"The complex permittivity and permeability are evaluated by rectangular waveguide measurement technique which is based on hybrid electromagnetic method and uses an iterative process to fit the calculated values to the measured data. The iterative process is investigated by virtual experiments, and the efficiency and robustness of the evaluation method is confirmed.","PeriodicalId":273349,"journal":{"name":"2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)","volume":"60 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":"130978396","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}
引用次数: 8
Spectral domain approach of microstrip open-end and gap discontinuities using new pulses with strongly decaying spectrum 微带开端和间隙不连续的谱域分析采用强衰减谱新脉冲
2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO) Pub Date : 2014-05-14 DOI: 10.1109/NEMO.2014.6995655
F. Grine, M. T. Benhabiles, M. L. Riabi
{"title":"Spectral domain approach of microstrip open-end and gap discontinuities using new pulses with strongly decaying spectrum","authors":"F. Grine, M. T. Benhabiles, M. L. Riabi","doi":"10.1109/NEMO.2014.6995655","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995655","url":null,"abstract":"This paper develops a solution to the problem of a rectangular microstrip open-end and gap discontinuities. In this solution the integral equation is formulated in the spectral domain for the microstrip open-end and gap discontinuities on an infinite dielectric substrate. The integral equation is solved by the Galerkin's method. The choice of the basis functions is important in achieving a highly efficient numerical solution. Therefore, in this work we propose two new classes of pulses with strongly decaying spectrum that were recently introduced as piecewise basis functions for the spectral domain approach : the Raised Cosine Pulse and the Cubic Pulse, respectively referred RC(x) C(x).","PeriodicalId":273349,"journal":{"name":"2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)","volume":"18 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":"130421811","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}
引用次数: 0
Vertically-grown MW CNT bundles microwave characterization for antenna applications 垂直生长的毫微米碳纳米管束天线应用微波特性
2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO) Pub Date : 2014-05-14 DOI: 10.1109/NEMO.2014.6995702
C. Tripon-Canseliet, S. Xavier, M. Modreanu, A. Ziaei, J. Chazelas
{"title":"Vertically-grown MW CNT bundles microwave characterization for antenna applications","authors":"C. Tripon-Canseliet, S. Xavier, M. Modreanu, A. Ziaei, J. Chazelas","doi":"10.1109/NEMO.2014.6995702","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995702","url":null,"abstract":"This paper describes, for the first time, to our knowledge, the extraction of microwave permittivity measurements of vertically grown multiwall carbon nanotubes bundles/forests grown on quartz substrate. Dedicated test beds have been designed and realized in order to make these measurements possible. Microwave characterization techniques have been performed up to 67 GHz and the frequency dependence of the effective permittivity for MWCNTs has been extracted for CNT-based small antennas design in planar integrated technology.","PeriodicalId":273349,"journal":{"name":"2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)","volume":"4 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":"125581531","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}
引用次数: 5
Numerical study of photonic metamaterial composites 光子超材料复合材料的数值研究
2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO) Pub Date : 2014-05-14 DOI: 10.1109/NEMO.2014.6995675
T. Terao
{"title":"Numerical study of photonic metamaterial composites","authors":"T. Terao","doi":"10.1109/NEMO.2014.6995675","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995675","url":null,"abstract":"A novel numerical method to calculate interior eigenvalues and corresponding eigenvectors for nonsymmetric matrices is proposed. Based on the subspace projection technique onto expanded Ritz subspace, it becomes possible to obtain eigenvalues and eigenvectors with sufficiently high precision. This method overcomes the difficulties of the traditional nonsymmetric Lanczos algorithm, and improves the accuracy of the obtained interior eigenvalues and eigenvectors. Using this algorithm, we investigate three-dimensional metamaterial composites consisting of positive and negative refractive index materials, and it is demonstrated that the finite-difference frequency-domain algorithm is applicable to analyze these metamaterial composites.","PeriodicalId":273349,"journal":{"name":"2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)","volume":"42 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":"125676342","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}
引用次数: 0
Modeling of through-silicon via's (TSV) with a 3D planar integral equation solver 硅通孔(TSV)的三维平面积分方程求解方法
2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO) Pub Date : 2014-05-14 DOI: 10.1109/NEMO.2014.6995659
J. Sercu, T. Schwartzmann
{"title":"Modeling of through-silicon via's (TSV) with a 3D planar integral equation solver","authors":"J. Sercu, T. Schwartzmann","doi":"10.1109/NEMO.2014.6995659","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995659","url":null,"abstract":"Through-silicon via (TSV) interconnection technology is seen as a key enabling technology for stacking silicon dies and building 3D chips. In this paper, we present a novel technique to enable the modeling of through-silicon via interconnects within a 3D planar integral equation solver. The technique is capable of modeling both the dielectric isolation effects of the TSV oxide and the metal-oxide-semiconductor (MOS) depletion effects at the TSV oxide - silicon bulk contact regions.","PeriodicalId":273349,"journal":{"name":"2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)","volume":"25 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":"127240721","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}
引用次数: 0
On the use of electrostatically doped graphene: Analysis of microwave attenuators 静电掺杂石墨烯的应用:微波衰减器的分析
2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO) Pub Date : 2014-05-14 DOI: 10.1109/NEMO.2014.6995716
L. Pierantoni, M. Bozzi, R. Moro, D. Mencarelli, S. Bellucci
{"title":"On the use of electrostatically doped graphene: Analysis of microwave attenuators","authors":"L. Pierantoni, M. Bozzi, R. Moro, D. Mencarelli, S. Bellucci","doi":"10.1109/NEMO.2014.6995716","DOIUrl":"https://doi.org/10.1109/NEMO.2014.6995716","url":null,"abstract":"In this contribution, the electrostatic tunability of graphene is exploited in order to fabricate compact and effective microwave filters, namely field attenuators. A graphene patch of millimeter size is placed across the air gap of a discontinued microstrip-line, and tuned by means of an electrostatic bias applied by a high impedance line, that is, in turns, de-coupled from the microwave filter at center-band frequency. Results show that the filter response is strongly dependent on the external bias, and this promises not only for unprecedented performances, in terms of mass, volume and power consumption, but also for possible integration of graphene in a wide class of standard microwave devices.","PeriodicalId":273349,"journal":{"name":"2014 International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)","volume":"32 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":"117030408","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}
引用次数: 19
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