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A Finite Element Boundary Integral Method For Conformal Antenna Arrays On A Circular Cylinder Bfinal Report
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Book Synopsis A Finite Element-boundary Integral Method for Conformal Antenna Arrays on a Circular Cylinder :bfinal Report by : Leo C. Kempel
Download or read book A Finite Element-boundary Integral Method for Conformal Antenna Arrays on a Circular Cylinder :bfinal Report written by Leo C. Kempel and published by . This book was released on 1992 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722000257 Total Pages :36 pages Book Rating :4.0/5 (2 download)
Book Synopsis A Finite Element-Boundary Integral Method for Conformal Antenna Arrays on a Circular Cylinder by : National Aeronautics and Space Administration (NASA)
Download or read book A Finite Element-Boundary Integral Method for Conformal Antenna Arrays on a Circular Cylinder written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-28 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conformal antenna arrays offer many cost and weight advantages over conventional antenna systems. In the past, antenna designers have had to resort to expensive measurements in order to develop a conformal array design. This is due to the lack of rigorous mathematical models for conformal antenna arrays, and as a result the design of conformal arrays is primarily based on planar antenna design concepts. Recently, we have found the finite element-boundary integral method to be very successful in modeling large planar arrays of arbitrary composition in a metallic plane. Herewith we shall extend this formulation for conformal arrays on large metallic cylinders. In this we develop the mathematical formulation. In particular we discuss the finite element equations, the shape elements, and the boundary integral evaluation, and it is shown how this formulation can be applied with minimal computation and memory requirements. The implementation shall be discussed in a later report. Kempel, Leo C. and Volakis, John L. and Woo, Alex C. and Yu, C. Long Unspecified Center NCA2-543...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722000189 Total Pages :46 pages Book Rating :4.0/5 (1 download)
Book Synopsis A Finite Element-Boundary Integral Method for Cavities in a Circular Cylinder by : National Aeronautics and Space Administration (NASA)
Download or read book A Finite Element-Boundary Integral Method for Cavities in a Circular Cylinder written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-28 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conformal antenna arrays offer many cost and weight advantages over conventional antenna systems. However, due to a lack of rigorous mathematical models for conformal antenna arrays, antenna designers resort to measurement and planar antenna concepts for designing non-planar conformal antennas. Recently, we have found the finite element-boundary integral method to be very successful in modeling large planar arrays of arbitrary composition in a metallic plane. We extend this formulation to conformal arrays on large metallic cylinders. In this report, we develop the mathematical formulation. In particular, we discuss the shape functions, the resulting finite elements and the boundary integral equations, and the solution of the conformal finite element-boundary integral system. Some validation results are presented and we further show how this formulation can be applied with minimal computational and memory resources. Kempel, Leo C. and Volakis, John L. Unspecified Center NCA2-653...
Book Synopsis A finite element-boundary integral method for cavities in a circular cylinder by : Leo C. Kempel and J. L. Volakis
Download or read book A finite element-boundary integral method for cavities in a circular cylinder written by Leo C. Kempel and J. L. Volakis and published by . This book was released on 1992 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Finite Element Analysis of Conformal Antennas by : Tayfun Özdemir
Download or read book Finite Element Analysis of Conformal Antennas written by Tayfun Özdemir and published by . This book was released on 1998 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Finite Element-Boundary Integral Method for Cavities in a Circular Cylinder by : Leo C. Kempel
Download or read book A Finite Element-Boundary Integral Method for Cavities in a Circular Cylinder written by Leo C. Kempel and published by . This book was released on with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Frequency Domain Hybrid Finite Element Methods for Electromagnetics by : John Leonidas Volakis
Download or read book Frequency Domain Hybrid Finite Element Methods for Electromagnetics written by John Leonidas Volakis and published by Morgan & Claypool Publishers. This book was released on 2006 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a brief overview of the popular Finite Element Method (FEM) and its hybrid versions for electromagnetics with applications to radar scattering, antennas and arrays, guided structures, microwave components, frequency selective surfaces, periodic media, and RF materials characterizations and related topics. It starts by presenting concepts based on Hilbert and Sobolev spaces as well as Curl and Divergence spaces for generating matrices, useful in all engineering simulation methods. It then proceeds to present applications of the finite element and finite element-boundary integral methods for scattering and radiation. Applications to periodic media, metamaterials and bandgap structures are also included. The hybrid volume integral equation method for high contrast dielectrics and is presented for the first time. Another unique feature of the book is the inclusion of design optimization techniques and their integration within commercial numerical analysis packages for shape and material design. To aid the reader with the method's utility, an entire chapter is devoted to two-dimensional problems. The book can be considered as an update on the latest developments since the publication of our earlier book (Finite Element Method for Electromagnetics, IEEE Press, 1998). The latter is certainly complementary companion to this one.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721993437 Total Pages :36 pages Book Rating :4.9/5 (934 download)
Book Synopsis A Class of Hybrid Finite Element Methods for Electromagnetics by : National Aeronautics and Space Administration (NASA)
Download or read book A Class of Hybrid Finite Element Methods for Electromagnetics written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-27 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Integral equation methods have generally been the workhorse for antenna and scattering computations. In the case of antennas, they continue to be the prominent computational approach, but for scattering applications the requirement for large-scale computations has turned researchers' attention to near neighbor methods such as the finite element method, which has low O(N) storage requirements and is readily adaptable in modeling complex geometrical features and material inhomogeneities. In this paper, we review three hybrid finite element methods for simulating composite scatterers, conformal microstrip antennas, and finite periodic arrays. Specifically, we discuss the finite element method and its application to electromagnetic problems when combined with the boundary integral, absorbing boundary conditions, and artificial absorbers for terminating the mesh. Particular attention is given to large-scale simulations, methods, and solvers for achieving low memory requirements and code performance on parallel computing architectures. Volakis, J. L. and Chatterjee, A. and Gong, J. Unspecified Center NCA2-653...
Book Synopsis Boundary Integral Methods by : Luigi Morino
Download or read book Boundary Integral Methods written by Luigi Morino and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 533 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains edited papers from IABEM-90, the 1990 Symposium of the Interna tional Association for Boundary Element Methods (IABEM). As stated in the By-Laws of the Association, the purposes of IABEM are: 1. to promote the international exchange of technical information related to the devel opment and application of boundary-integral equation (BIE) formulations and their numerical implementation to problems in engineering and science, commonly referred to as the boundary element method (BEM); 2. to promote research and development activities for the advancement of boundary integral equation methods and boundary element solution algorithms; 3. to foster closer personal relationships within the BEM community of researchers. The objectives of the Symposium, in line with those of the Association, was to provide a forum where the two "souls" of the Association, i. e. , (i) mathematical foundations and numerical aspects, and (ii) engineering applications could be integrated. We believe that the first aspect has been neglected in too many of the BEM Symposia held in the past, which, with a few exceptions (notably, the IUTAM Symposia on the subject) have emphasized the practical aspects of the method. As a consequence, we have tried to give a stronger emphasis to the more theoretical issues: this is attested for instance, by the fact that the two general lectures were given by Prof. Gaetano Fichera, of the University of Rome "La Sapienza," and Prof.
Book Synopsis Mixed Element Formulation for the Finite Element-boundary Integral Method by : Jeffrey David Meese
Download or read book Mixed Element Formulation for the Finite Element-boundary Integral Method written by Jeffrey David Meese and published by . This book was released on 2003 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Boundary Element Method with Programming by : Gernot Beer
Download or read book The Boundary Element Method with Programming written by Gernot Beer and published by Springer Science & Business Media. This book was released on 2008-09-03 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thorough yet understandable introduction to the boundary element method presents an attractive alternative to the finite element method. It not only explains the theory but also presents the implementation of the theory into computer code, the code in FORTRAN 95 can be freely downloaded. The book also addresses the issue of efficiently using parallel processing hardware in order to considerably speed up the computations for large systems. The applications range from problems of heat and fluid flow to static and dynamic elasto-plastic problems in continuum mechanics.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722003548 Total Pages :36 pages Book Rating :4.0/5 (35 download)
Book Synopsis A Hybrid Finite Element-Boundary Integral for the Analysis of Cavity-Backed Antennas of Arbitrary Shape by : National Aeronautics and Space Administration (NASA)
Download or read book A Hybrid Finite Element-Boundary Integral for the Analysis of Cavity-Backed Antennas of Arbitrary Shape written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-20 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the final report on this project which was concerned with the analysis of cavity-backed antennas and more specifically spiral antennas. The project was a continuation of a previous analysis, which employed rectangular brick elements, and was, thus, restricted to planar rectangular patch antennas. A total of five reports were submitted under this project and we expect that at least four journal papers will result from the research described in these reports. The abstracts of the four previous reports are included. The first of the reports (028918-1-T) is over 75 pages and describes the general formulation using tetrahedral elements and the computer program. Report 028918-2-T was written after the completion of the computer program and reviews the capability of the analysis and associated software for planar circular rectangular patches and for a rectangular planar spiral. Measurements were also done at the University of Michigan and at Mission Research Corp. for the purpose of validating the software. We are pleased to acknowledge a partial support from Mission Research Corp. in carrying out the work described in this report. The third report (028918-3-T) describes the formulation and partial validation (using 2D data) for patch antennas on a circular platform. The 3D validation and development of the formulation for patch antennas on circular platforms is still in progress. The fourth report (028918-4-T) is basically an invited journal paper which will appear in the 'J. Electromagnetic Waves and Applications' in early 1994. It describes the application of the finite element method in electromagnetics and is primarily based on our work here at U-M. This final report describes the culmination of our efforts in characterizing complex cavity-backed antennas on planar platforms. The report describes for the first time the analysis of non-planar spirals and non-rectangular slot antennas as well as traditional planar patch antennas. The comparisons between measurem...
Book Synopsis Robust Development of Hybrid Finite Element Methods for Antennas and Microwave Circuits by : Jian Gong
Download or read book Robust Development of Hybrid Finite Element Methods for Antennas and Microwave Circuits written by Jian Gong and published by . This book was released on 1996 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722131692 Total Pages :84 pages Book Rating :4.1/5 (316 download)
Book Synopsis A Finite Element Boundary Integral Formulation for Radiation and Scattering by Cavity Antennas Using Tetrahedral Elements by : National Aeronautics and Space Administration (NASA)
Download or read book A Finite Element Boundary Integral Formulation for Radiation and Scattering by Cavity Antennas Using Tetrahedral Elements written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-02 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: A hybrid finite element boundary integral formulation is developed using tetrahedral and/or triangular elements for discretizing the cavity and/or aperture of microstrip antenna arrays. The tetrahedral elements with edge based linear expansion functions are chosen for modeling the volume region and triangular elements are used for discretizing the aperture. The edge based expansion functions are divergenceless thus removing the requirement to introduce a penalty term and the tetrahedral elements permit greater geometrical adaptability than the rectangular bricks. The underlying theory and resulting expressions are discussed in detail together with some numerical scattering examples for comparison and demonstration. Gong, J. and Volakis, J. L. and Chatterjee, A. and Jin, J. M. Unspecified Center...
Book Synopsis A Combined Finte Element-Boundary Element Formulation for Solution of Axially Symmetric Bodies by : JEFFERY D. COLLINS, JOHN L. VOLAKIS
Download or read book A Combined Finte Element-Boundary Element Formulation for Solution of Axially Symmetric Bodies written by JEFFERY D. COLLINS, JOHN L. VOLAKIS and published by . This book was released on with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advanced Formulations in Boundary Element Methods by : M. H. Aliabadi
Download or read book Advanced Formulations in Boundary Element Methods written by M. H. Aliabadi and published by . This book was released on 1993 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Scaled Boundary Finite Element Method by : John P. Wolf
Download or read book The Scaled Boundary Finite Element Method written by John P. Wolf and published by John Wiley & Sons. This book was released on 2003-03-14 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: A novel computational procedure called the scaled boundary finite-element method is described which combines the advantages of the finite-element and boundary-element methods : Of the finite-element method that no fundamental solution is required and thus expanding the scope of application, for instance to anisotropic material without an increase in complexity and that singular integrals are avoided and that symmetry of the results is automatically satisfied. Of the boundary-element method that the spatial dimension is reduced by one as only the boundary is discretized with surface finite elements, reducing the data preparation and computational efforts, that the boundary conditions at infinity are satisfied exactly and that no approximation other than that of the surface finite elements on the boundary is introduced. In addition, the scaled boundary finite-element method presents appealing features of its own : an analytical solution inside the domain is achieved, permitting for instance accurate stress intensity factors to be determined directly and no spatial discretization of certain free and fixed boundaries and interfaces between different materials is required. In addition, the scaled boundary finite-element method combines the advantages of the analytical and numerical approaches. In the directions parallel to the boundary, where the behaviour is, in general, smooth, the weighted-residual approximation of finite elements applies, leading to convergence in the finite-element sense. In the third (radial) direction, the procedure is analytical, permitting e.g. stress-intensity factors to be determined directly based on their definition or the boundary conditions at infinity to be satisfied exactly. In a nutshell, the scaled boundary finite-element method is a semi-analytical fundamental-solution-less boundary-element method based on finite elements. The best of both worlds is achieved in two ways: with respect to the analytical and numerical methods and with respect to the finite-element and boundary-element methods within the numerical procedures. The book serves two goals: Part I is an elementary text, without any prerequisites, a primer, but which using a simple model problem still covers all aspects of the method and Part II presents a detailed derivation of the general case of statics, elastodynamics and diffusion.
