Wideband Solutions of Two-dimensional Electromagnetic Scattering Problems by Means of a Novel Combination of Finite Element Method (FEM) Or Extended Boundary Condition Method (EBCM) and Pade Approximation PDF Download
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Author: Naser Ahmad Abu-Zaid
Publisher:
ISBN:
Category : Electrical engineering
Languages : en
Pages : 129
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Book Description
Author: Naser Ahmad Abu-Zaid
Publisher:
ISBN:
Category : Electrical engineering
Languages : en
Pages : 129
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Book Description
Author: Michael A. Morgan
Publisher: Elsevier Science & Technology
ISBN:
Category : Electromagnetic theory
Languages : en
Pages : 408
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Book Description
Author: IEEE Antennas and Propagation Society
Publisher: Institute of Electrical & Electronics Engineers(IEEE)
ISBN:
Category : Mathematics
Languages : en
Pages : 560
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Book Description
Author: Zhihua Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 162
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Book Description
Author: Chuan Lu
Publisher:
ISBN:
Category : Electromagnetism
Languages : en
Pages : 338
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Book Description
Author: Jie Wu
Publisher:
ISBN:
Category : Electromagnetic waves
Languages : en
Pages : 38
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Book Description
Author: James J. Schuler
Publisher:
ISBN:
Category : Electromagnetic fields
Languages : en
Pages : 266
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Book Description
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722128135
Category :
Languages : en
Pages : 56
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Book Description
A method for the computation of electromagnetic scattering from arbitrary two-dimensional bodies is presented. The method combines the finite element and boundary element methods leading to a system for solution via the conjugate gradient Fast Fourier Transform (FFT) algorithm. Two forms of boundaries aimed at reducing the storage requirement of the boundary integral are investigated. It is shown that the boundary integral becomes convolutional when a circular enclosure is chosen, resulting in reduced storage requirement when the system is solved via the conjugate gradient FFT method. The same holds for the ogival enclosure, except that some of the boundary integrals are not convolutional and must be carefully treated to maintain O(N) memory requirement. Results for several circular and ogival structures are presented and shown to be in excellent agreement with those obtained by traditional methods. Collins, Jeffery D. and Jin, Jian-Ming and Volakis, John L. Unspecified Center...
Author: Perry Villanueva
Publisher:
ISBN: 9781423545736
Category :
Languages : en
Pages : 129
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Book Description
Infinite periodic structures have been studied heavily because of their efficient filtering capabilities. They generally exhibit sharp frequency roll-offs at the frequency band of interest. In the RF region of the electromagnetic spectrum, periodic structures find applications such as radomes and photonic bandgap materials. Most studies have been done with infinitely periodic arrays because it is convenient to collapse an infinite array into one representative period using Floquet Analysis. Truncating an infinite array introduces an edge and invalidates Floquet analysis over the entire array. This thesis formulates a Finite Element Method (FEM) solution of a semi-infinite periodic array consisting of infinite cylinders. The array elements sufficiently far from the edge are implemented using the concept of a Physical Basis Function (PBF). The PBF concept is based on an a priori knowledge that the amplitudes of the currents in the periodic elements that are sufficiently far from an edge are constant. Implementation of the PBF concept allows the solution domain of the FEM to be bounded by introducing a periodic boundary that represents the truncated portion of the periodic array. The periodic boundary is implemented by relating the fields there with a Floquet phase factor based on one periodic element external to the FEM domain. Performance of the periodic boundary at normal incidence is promising. At off-normal incidence, the implemented boundary performs poorly. Implementation of a periodic boundary by relating the fields there with a Floquet phase factor with one interior periodic element is the next stage in improving off-normal incidence performance.
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722905309
Category :
Languages : en
Pages : 120
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Book Description
Several techniques that influence the low frequency scattering from penetrable edge terminations are evaluated using a hybrid finite element and boundary element method code. The edge terminations consist of a dielectric skin forming an exterior shape with an internal conducting bulkhead. Some of the techniques considered are bulkhead shaping, internal material loading, placement of resistive cards, and the placement of lossy dielectric material rods. The intent of the various treatments is to find a combination or combinations that influence(s) the backscattered field to acceptable levels over a range of frequencies for both transverse magnetic and transverse electric polarizations. Gray, B. E. and Dominek, A. K. and Wang, N. Glenn Research Center NUMERICAL ANALYSIS; MATHEMATICAL MODELS; ELECTROMAGNETIC SCATTERING; BOUNDARY ELEMENT METHOD; FINITE ELEMENT METHOD; TWO DIMENSIONAL MODELS; EDGES; DIELECTRICS; BULKHEADS; BACKSCATTERING; POLARIZED ELECTROMAGNETIC RADIATION; GRID GENERATION (MATHEMATICS)...
