Time-domain Computation of Electromagnetic Wave Scattering by the Method of Conforming Boundary Elements PDF Download

Author: Andreas C. Cangellaris
Publisher:
ISBN:
Category :
Languages : en
Pages : 362

View

Book Description

Author: M.A. Morgan
Publisher: Elsevier
ISBN: 1483289532
Category : Technology & Engineering
Languages : en
Pages : 398

View

Book Description
This second volume in the Progress in Electromagnetic Research series examines recent advances in computational electromagnetics, with emphasis on scattering, as brought about by new formulations and algorithms which use finite element or finite difference techniques. Containing contributions by some of the world's leading experts, the papers thoroughly review and analyze this rapidly evolving area of computational electromagnetics. Covering topics ranging from the new finite-element based formulation for representing time-harmonic vector fields in 3-D inhomogeneous media using two coupled scalar potentials, to the consideration of conforming boundary elements and leap-frog time-marching in transient field problems involving corners and wedges in two and three dimensions, the volume will provide an indispensable reference source for practitioners and students of computational electromagnetics.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 28

View

Book Description
We consider a model for the interrogation of a planar Debye medium by a non-harmonic microwave pulse from an antenna source in free space, and we compute the reflected solution using finite elements in the spatial variables and finite differences in the time variable. Perfectly Matched Layers (PMLs) and an absorbing boundary condition are used to damp waves interacting with artificial boundaries imposed to allow finite computational domains. We present simulation results showing that numerical reflections from interfaces at PML boundaries can be controlled.

Author: Walton C. Gibson
Publisher: CRC Press
ISBN: 1000412482
Category : Mathematics
Languages : en
Pages : 510

View

Book Description
The Method of Moments in Electromagnetics, Third Edition details the numerical solution of electromagnetic integral equations via the Method of Moments (MoM). Previous editions focused on the solution of radiation and scattering problems involving conducting, dielectric, and composite objects. This new edition adds a significant amount of material on new, state-of-the art compressive techniques. Included are new chapters on the Adaptive Cross Approximation (ACA) and Multi-Level Adaptive Cross Approximation (MLACA), advanced algorithms that permit a direct solution of the MoM linear system via LU decomposition in compressed form. Significant attention is paid to parallel software implementation of these methods on traditional central processing units (CPUs) as well as new, high performance graphics processing units (GPUs). Existing material on the Fast Multipole Method (FMM) and Multi-Level Fast Multipole Algorithm (MLFMA) is also updated, blending in elements of the ACA algorithm to further reduce their memory demands. The Method of Moments in Electromagnetics is intended for students, researchers, and industry experts working in the area of computational electromagnetics (CEM) and the MoM. Providing a bridge between theory and software implementation, the book incorporates significant background material, while presenting practical, nuts-and-bolts implementation details. It first derives a generalized set of surface integral equations used to treat electromagnetic radiation and scattering problems, for objects comprising conducting and dielectric regions. Subsequent chapters apply these integral equations for progressively more difficult problems such as thin wires, bodies of revolution, and two- and three-dimensional bodies. Radiation and scattering problems of many different types are considered, with numerical results compared against analytical theory as well as measurements.

Author: Ahmed Kishk
Publisher: BoD – Books on Demand
ISBN: 9535108387
Category : Technology & Engineering
Languages : en
Pages : 362

View

Book Description
In this book, a wide range of different topics related to analytical as well as numerical solutions of problems related to scattering, propagation, radiation, and emission in different medium are discussed. Design of several devices and their measurements aspects are introduced. Topics related to microwave region as well as Terahertz and quasi-optical region are considered. Bi-isotropic metamaterial in optical region is investigated. Interesting numerical methods in frequency domain and time domain for scattering, radiation, forward as well as reverse problems and microwave imaging are summarized. Therefore, the book will satisfy different tastes for engineers interested for example in microwave engineering, antennas, and numerical methods.

Author: Marinos N. Vouvakis
Publisher:
ISBN:
Category : Boundary element methods
Languages : en
Pages :

View

Book Description
Abstract: It is well known that the scope and application of numerically-rigorous techniques for full-wave electromagnetic characterization is limited to problems of moderate electrical size and simplified complexity. These limitations stem from the vast computational resources required by numerical methods such as finite element method (FEM), boundary element method (BEM) or finite difference method (FDM). During the last decade a number of fast and memory efficient numerical algorithms such as Multigrid methods and the Fast Multipole Algorithm (FMA), have been proposed to further reduce storage and computational requirements of full-wave methods. In this dissertation an alternative proposition will be presented, that is a fast and efficient Domain Decomposition (DD) methodology, appropriately tailored for the solution of time-harmonic Maxwell's equations. The DD method proposed here is a non-conforming one, namely it allows for different mesh on either side of domain interface. This not only relaxes and speeds up automatic mesh generation algorithms, but at the same time opens the road of efficient and robust adaptive field computations. The DD technique is based on a divide-and-conquer philosophy. Instead of tackling a large and complex problem directly (as a whole), it divides the computational domain into smaller, possibly repetitive, and easier to solve partitions called domains. Such domains can be solved with a variety of numerical methods, e.g. finite elements, boundary elements, etc. The algorithm proceeds iteratively by appropriately communicating information across domains and ultimately reaching the solution for the original (whole) problem. A detailed presentation of the proposed DD method for electromagnetic problems will be given, along with a novel methodology called "cement" finite elements, for the coupling of domains with non-matching meshes. In addition, a variant of the Finite Element Tearing and Interconnecting (FETI) sub-structuring algorithm will be introduced. Numerical results for a number of challenging real-life engineering electromagnetic applications, ranging from large antenna arrays to novel engineered materials, photonic crystals, and large object scattering, will be given. As a result of this research, complex problems with upwards of 50 to 900 million finite element unknowns have been solved on personal computers without the need of parallelization. Finally, further applications of the cement and DD methods on infinite periodic problems without periodic meshing and a very promising DD based FEM-BEM hybrid are also proposed and studied.

Author: Khaled ElMahgoub
Publisher: Morgan & Claypool Publishers
ISBN: 1608458148
Category : Technology & Engineering
Languages : en
Pages : 142

View

Book Description
Periodic structures are of great importance in electromagnetics due to their wide range of applications such as frequency selective surfaces (FSS), electromagnetic band gap (EBG) structures, periodic absorbers, meta-materials, and many others. The aim of this book is to develop efficient computational algorithms to analyze the scattering properties of various electromagnetic periodic structures using the finite-difference time-domain periodic boundary condition (FDTD/PBC) method. A new FDTD/PBC-based algorithm is introduced to analyze general skewed grid periodic structures while another algorithm is developed to analyze dispersive periodic structures. Moreover, the proposed algorithms are successfully integrated with the generalized scattering matrix (GSM) technique, identified as the hybrid FDTD-GSM algorithm, to efficiently analyze multilayer periodic structures. All the developed algorithms are easy to implement and are efficient in both computational time and memory usage. These algorithms are validated through several numerical test cases. The computational methods presented in this book will help scientists and engineers to investigate and design novel periodic structures and to explore other research frontiers in electromagnetics. Table of Contents: Introduction / FDTD Method and Periodic Boundary Conditions / Skewed Grid Periodic Structures / Dispersive Periodic Structures / Multilayered Periodic Structures / Conclusions

Author: Jiayuan Fang
Publisher:
ISBN:
Category :
Languages : en
Pages : 372

View

Book Description

Author: Can Yun Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 328

View

Book Description

Author: T. Berceli
Publisher:
ISBN:
Category : Electromagnetic theory
Languages : en
Pages : 390

View

Book Description