The Experts below are selected from a list of 121041 Experts worldwide ranked by ideXlab platform
Thomas Weiland - One of the best experts on this subject based on the ideXlab platform.
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Differential Material Matrices for the Finite Integration Technique
The European Physical Journal Applied Physics, 2007Co-Authors: H. De Gersem, Irina Munteanu, Thomas WeilandAbstract:In this paper, differential conductivity and reluctivity matrices are constructed for formulations discretised by the finite Integration Technique and linearised by the Newton method. It turns out that these matrices are nondiagonal and unsymmetric, even in the case that orthogonal grids are used. A diagonal approximation of the differential matrices leads to an approximate Newton method where cross-magnetisation effects are no longer considered, except in the update between the successive nonlinear iteration steps. The approximate method does not guarantee second order convergence but outperforms the true Newton method when only a moderate accuracy is required.
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rf microwave simulation with the finite Integration Technique from component to system design
2007Co-Authors: Irina Munteanu, Thomas WeilandAbstract:The paper presents a historical review and the current state-of-the-art of the Finite Integration Technique (FIT), method which has been successfully used for almost 30 years for the solution of electromagnetic field problems. The presented applications are in the range of high-end RF and microwave technologies.
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RF & Microwave Simulation with the Finite Integration Technique - from Component to System Design
Scientific Computing in Electrical Engineering, 2007Co-Authors: Irina Munteanu, Thomas WeilandAbstract:The paper presents a historical review and the current state-of-the-art of the Finite Integration Technique (FIT), method which has been successfully used for almost 30 years for the solution of electromagnetic field problems. The presented applications are in the range of high-end RF and microwave technologies.
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Newton and Approximate Newton Methods in Combination with the Orthogonal Finite Integration Technique
Scientific Computing in Electrical Engineering, 2007Co-Authors: H. De Gersem, Irina Munteanu, Thomas WeilandAbstract:The paper describes the application of the Newton method in conjunction with the Finite Integration Technique. Even on orthogonal grid pairs, the material matrices become nondiagonal and lead to higher algorithmic complexity. A uni-directional version of these matrices provides a computationally inexpensive alternative. The paper compares and discusses the two algorithms' order of convergence and their computational complexity.
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field circuit coupling for time harmonic models discretized by the finite Integration Technique
IEEE Transactions on Magnetics, 2004Co-Authors: H. De Gersem, Thomas WeilandAbstract:This paper develops the coupling between a three-dimensional modified magnetic vector potential formulation discretized by the finite Integration Technique and a circuit including solid and stranded conductors. The conductor models relate local quantities defined at primary edges or dual facets and the global circuit unknowns. Two possible coupling matrices are derived which either affect the edges perpendicular to a reference cross section or all edges inside the conductor. To preserve the sparsity and the structure of the discrete field system, the circuit analysis is based on a circuit tree, incorporates both voltage drops and currents as additional unknowns, and results in a symmetric coupling. The numerical efficiency of both coupling approaches is compared for technical applications.
C. Guedes Soares - One of the best experts on this subject based on the ideXlab platform.
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Ro-Ro Ship Damage Stability Calculations Using the Pressure Integration Technique
International Shipbuilding Progress, 2001Co-Authors: Ta Santos, C. Guedes SoaresAbstract:This work presents a formulation to calculate the time change of the damage stability of ships with open water. It adopts a pressure Integration Technique, which has been used earlier to calculate the hydrostatic properties of marine structures, and is extended here to compute the rates of flow through damage openings while performing flooding simulations. The principles of this Technique are exposed and its advantages and disadvantages are discussed. Using a practical method to generate the panels required to use the pressure Integration Technique, a damaged Ro-Ro ship numerical model has been generated. Results of its intact and damaged stability, obtained using the pressure Integration Technique, are presented, compared with other numerical results and discussed. The Technique is then applied to estimate the rate of flow through damage openings on the ship’s hull. The results allow the conclusion that this Technique can be successfully applied to the time domain simulation of ship flooding, both to compute the damaged ship hydrostatic properties and the rate of flow through the damage openings on the ship’s hull.
Ke Wu - One of the best experts on this subject based on the ideXlab platform.
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Multilayer-Substrate Integration Technique of Air-Filled Waveguide Circuits
2016Co-Authors: Anthony Ghiotto, Frédéric Parment, Tan-phu Vuong, Ke WuAbstract:This paper presents Air-Filled Substrate Integrated Waveguide (AFSIW) intended for the design of high performance and low-cost systems based on multilayer Printed Circuit Board (PCB) process. The top and bottom layer may make use of an extremely low-cost standard substrate such as FR-4 on which base-band or digital circuits can be implemented so to obtain a self-packaged and compact millimeter-wave integrated system.
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single substrate Integration Technique of planar circuits and waveguide filters
IEEE Transactions on Microwave Theory and Techniques, 2003Co-Authors: Dominic Deslandes, Ke WuAbstract:The integrated planar Technique has been considered as a reliable candidate for low-cost mass production of millimeter-wave circuits and systems. This paper presents new concepts that allow for a complete Integration of planar circuits and waveguide filters synthesized on a single substrate by means of metallized post (or via-hole) arrays. Analysis of the synthesized integrated waveguide and design criteria are presented for the post pitch and diameter. A filter design method derived from a synthesis Technique using inductive post is presented. An experimental three-pole Chebyshev filter having 1-dB insertion loss and return loss better than 17 dB is demonstrated. Integrating such planar and nonplanar circuits on a substrate can significantly reduce size, weight, and cost, and greatly enhance manufacturing repeatability and reliability.
Tetsuji Matsuo - One of the best experts on this subject based on the ideXlab platform.
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optimal subgrid connection for space time finite Integration Technique
IEEE Transactions on Magnetics, 2017Co-Authors: Yuki Sakata, Takeshi Mifune, Tetsuji MatsuoAbstract:The subgrid connection for the space-time finite Integration Technique is optimized based on the propagation condition of plane waves. This condition results in an algebraic equation determining the optimization parameters for the grid connection. Two-dimensional wave propagation simulations show that this method generates optimal subgrid connections that reduce unphysical wave reflections.
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optimal subgrid connection for space time finite Integration Technique
IEEE Conference on Electromagnetic Field Computation, 2016Co-Authors: Yuki Sakata, Takeshi Mifune, Tetsuji MatsuoAbstract:The subgrid connection for space-time finite Integration Technique (FIT) is optimized based on the propagation condition of plane-wave applied to the time-marching scheme. The proposed method reduces unphysical wave reflection effectively.
Ta Santos - One of the best experts on this subject based on the ideXlab platform.
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Ro-Ro Ship Damage Stability Calculations Using the Pressure Integration Technique
International Shipbuilding Progress, 2001Co-Authors: Ta Santos, C. Guedes SoaresAbstract:This work presents a formulation to calculate the time change of the damage stability of ships with open water. It adopts a pressure Integration Technique, which has been used earlier to calculate the hydrostatic properties of marine structures, and is extended here to compute the rates of flow through damage openings while performing flooding simulations. The principles of this Technique are exposed and its advantages and disadvantages are discussed. Using a practical method to generate the panels required to use the pressure Integration Technique, a damaged Ro-Ro ship numerical model has been generated. Results of its intact and damaged stability, obtained using the pressure Integration Technique, are presented, compared with other numerical results and discussed. The Technique is then applied to estimate the rate of flow through damage openings on the ship’s hull. The results allow the conclusion that this Technique can be successfully applied to the time domain simulation of ship flooding, both to compute the damaged ship hydrostatic properties and the rate of flow through the damage openings on the ship’s hull.