Scattering Of Wedges And Cones With Impedance Boundary Conditions

Author : Mikhail A. Lyalinov,Ning Yan Zhu
Publisher : IET
Page : 231 pages
File Size : 40,6 Mb
Release : 2013
Category : Science
ISBN : 9781613530030

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Scattering of Wedges and Cones with Impedance Boundary Conditions by Mikhail A. Lyalinov,Ning Yan Zhu Pdf

This book discusses the development of new approaches which lead to exact (but not explicit) solutions of key canonical problems like diffraction by an impedance wedge or cone. Includes calculations of the diffraction or excitation coefficients, including their uniform versions, for the diffracted waves from the edge of the wedge or from the vertex of the cone. Study of the farfield behaviour in diffraction by impedance wedges or cones, reflected waves, space waves from the singular points of the boundary (from edges or tips) and surface waves. Applicability of the reported solution procedures and formulae to existing software packages designed for solving realworld highfrequency problems encountered in antenna, wave propagation and radar cross section.

Author : Mikhail A. Lyalinov
Publisher : Unknown
Page : 0 pages
File Size : 45,7 Mb
Release : 2013
Category : Electromagnetic waves
ISBN : OCLC:1102553557

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Scattering of Wedges and Cones with Impedance Boundary Conditions by Mikhail A. Lyalinov Pdf

Author : Vito G. Daniele,Guido Lombardi
Publisher : John Wiley & Sons
Page : 240 pages
File Size : 41,7 Mb
Release : 2020-10-29
Category : Technology & Engineering
ISBN : 9781119779438

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Scattering and Diffraction by Wedges 2 by Vito G. Daniele,Guido Lombardi Pdf

The book has a dual purpose. The first is to expose a general methodology to solve problems of electromagnetism in geometries constituted of angular regions. The second is to bring the solutions of some canonical problems of fundamental importance in modern electromagnetic engineering with the use of the Wiener-Hopf technique. In particular, the general mathematical methodology is very ingenious and original. It is based on sophisticated and attractive procedures exploiting simple and advanced properties of analytical functions. Once the reader has acquired the methodology, she/he can easily obtain the solution of the canonical problems reported in the book. The book can be appealing also to readers who are not directly interested in the detailed mathematical methodology and/ or in electromagnetics. In fact the same methodology can be extended to acoustics and elasticity problems. Moreover, the proposed practical problems with their solutions constitute a list of reference solutions and can be of interests in engineering production in the field of radio propagations, electromagnetic compatibility and radar technologies.

Author : Andrey V. Osipov,Sergei A. Tretyakov
Publisher : John Wiley & Sons
Page : 824 pages
File Size : 41,9 Mb
Release : 2017-04-17
Category : Technology & Engineering
ISBN : 9780470512388

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Modern Electromagnetic Scattering Theory with Applications by Andrey V. Osipov,Sergei A. Tretyakov Pdf

This self-contained book gives fundamental knowledge about scattering and diffraction of electromagnetic waves and fills the gap between general electromagnetic theory courses and collections of engineering formulas. The book is a tutorial for advanced students learning the mathematics and physics of electromagnetic scattering and curious to know how engineering concepts and techniques relate to the foundations of electromagnetics

Author : Vito G. Daniele,Guido Lombardi
Publisher : John Wiley & Sons
Page : 240 pages
File Size : 47,5 Mb
Release : 2020-09-21
Category : Science
ISBN : 9781119780069

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Scattering and Diffraction by Wedges 1 by Vito G. Daniele,Guido Lombardi Pdf

The book has a dual purpose. The first is to expose a general methodology to solve problems of electromagnetism in geometries constituted of angular regions. The second is to bring the solutions of some canonical problems of fundamental importance in modern electromagnetic engineering with the use of the Wiener-Hopf technique. In particular, the general mathematical methodology is very ingenious and original. It is based on sophisticated and attractive procedures exploiting simple and advanced properties of analytical functions. Once the reader has acquired the methodology, they can easily obtain the solution of the canonical problems reported in the book. The book can be appealing also to readers who are not directly interested in the detailed mathematical methodology and/ or in electromagnetics. In fact the same methodology can be extended to acoustics and elasticity problems. Moreover, the proposed practical problems with their solutions constitute a list of reference solutions and can be of interest in engineering production in the field of radio propagations, electromagnetic compatibility and radar technologies.

Author : Pyotr Ya. Ufimtsev
Publisher : John Wiley & Sons
Page : 496 pages
File Size : 40,9 Mb
Release : 2014-05-19
Category : Science
ISBN : 9781118753668

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Fundamentals of the Physical Theory of Diffraction by Pyotr Ya. Ufimtsev Pdf

The book is a complete, comprehensive description of the modern Physical Theory of Diffraction (PTD) based upon the concept of elementary edge waves. The theory is demonstrated with examples of the diffraction of acoustic and electromagnetic waves at perfectly reflecting objects. Readers develop the skills to apply PTD to solve various scattering problems. The derived analytic expressions clearly illustrate the physical structure of the scattered field. They additionally describe all of the reflected and diffracted rays and beams, as well as the fields in the vicinity of caustics and foci. Shadow radiation, a fundamental component of PTD, is introduced and proven to contain half the total scattered power. The equivalence relationships between acoustic and electromagnetic diffracted waves are established and emphasized. Throughout the book, the author enables readers to master both the theory and its practical applications. Plotted numeric results supplement the theory and facilitate the visualization of individual contributions of distinct parts of the scattering objects to the total diffracted field Detailed comments help readers understand and implement all the critical steps of the analytic and numeric calculations Problem sets in each chapter give readers an opportunity to analyse and investigate the diffraction phenomena

Author : Michael V. Vesnik
Publisher : Walter de Gruyter GmbH & Co KG
Page : 212 pages
File Size : 55,5 Mb
Release : 2015-07-24
Category : Science
ISBN : 9783110311297

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The Method of the Generalised Eikonal by Michael V. Vesnik Pdf

Diffraction theory describes scattering mechanisms for waves of various physical nature, scattered by objects of different shapes and materials. This book proposes new methods to account for the contour shape, edge profile and boundary conditions of three-dimensional scatterers (in particularly, flat polygons and polyhedrals). A standard method to refine the physical optics approximation (PO) is the heuristic method of edge waves (MEW). In comparison with MEW, the presented approaches simplify the solving and refining the PO approximation without solving a corresponding two-dimensional problem. Furthermore these methods allow to take into account the field perturbation in the vicinity of vertices. While the analytical formulas obtained by using these new approaches are as simple as in the PO case, the accuracy can be even higher than for MEW. On the basis of the developed methods construction of solutions for wave propagation in urban area and elastic wave diffraction (including seismic waves) are proposed. The book is useful for specialists who solve scientific and engineering problems in wave propagation and for students and postgraduate students.

Author : J.M.L Bernard
Publisher : ALPHA SCIENCE INTERNATIONAL LIMITED
Page : 170 pages
File Size : 44,5 Mb
Release : 2014-07-11
Category : Mathematics
ISBN : 9781783320288

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Advanced Theory of Diffraction by a Semi-infinite Impedance Cone by J.M.L Bernard Pdf

The mathematical problem concerning the diffraction by a semi-infinite cone with circular cross section for the Helmholtz equation, which has well-known solutions for Dirichlet and Neumann boundary conditions, is here considered for the more general boundary condition of constant impedance type. As previously stated by D.S. Jones, the problem then changes in complexity, beginning with the difficulty of obtaining the uniqueness of the solution. An exact analytical method is developed to reduce this problem to the determination of the solution of a well-posed non-oscillatory integral equation, of which the solution can be directly used to express the field in an integral form. Some generalization, in particular to the electromagnetic case, are also given.

Author : Stefan Lindenmeier,Robert Weigel
Publisher : Springer Science & Business Media
Page : 381 pages
File Size : 53,8 Mb
Release : 2011-07-13
Category : Technology & Engineering
ISBN : 9783642183751

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Electromagnetics and Network Theory and their Microwave Technology Applications by Stefan Lindenmeier,Robert Weigel Pdf

This volume provides a discussion of the challenges and perspectives of electromagnetics and network theory and their microwave applications in all aspects. It collects the most interesting contribution of the symposium dedicated to Professor Peter Russer held in October 2009 in Munich.

Author : Daniel J. Hoppe
Publisher : CRC Press
Page : 262 pages
File Size : 53,7 Mb
Release : 2018-10-08
Category : Technology & Engineering
ISBN : 9781482227840

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Impedance Boundary Conditions In Electromagnetics by Daniel J. Hoppe Pdf

Electromagnetic scattering from complex objects has been an area of in-depth research for many years. A variety of solution methodologies have been developed and utilised for the solution of ever increasingly complex problems. Among these methodologies, the subject of impedance boundary conditions has interested the authors for some time. In short, impedance boundary conditions allow one to replace a complex structure with an appropriate impedance relationship between the electric and magnetic fields on the surface of the object. This simplifies the solution of the problem considerably, allowing one to ignore the complexity of the internal structure beneath the surface. This book examines impedance boundary conditions in electromagnetics. The introductory chapter provides a presentation of the role of the impedance boundary conditions in solving practical electromagnetic problems and some historical background. One of the main objectives of this book is to present a unified and thorough discussion of this important subject. A method based on a spectral domain approach is presented to derive the Higher Order Impedance Boundary Conditions (HOIBC). The method includes all of the existing approximate boundary conditions, such as the Standard Impedence Boundary Condition, the Tensor Impedence Boundary Condition and the Generalised Impedance Boundary Conditions, as special cases. The special domain approach is applicable to complex coatings and surface treatments as well as simple dielectric coatings. The spectral domain approach is employed to determine the appropriate boundary conditions for planar dielectric coatings, chiral coatings and corregated conductors. The accuracy of the proposal boundary conditions is discussed. The approach is then extended to include the effects of curvature and is applied to curved dielectric and chiral coatings. Numerical data is presented to critically assess the accuracy of the results obtained using various forms of the impedence boundary conditions. A number of appendices that provide more detail on some of the topics addressed in the main body of the book and a selective list of references directly related to the topics addressed in this book are also included.

Author : Hasnain H. Syed
Publisher : Unknown
Page : 354 pages
File Size : 46,9 Mb
Release : 1992
Category : Electromagnetic waves
ISBN : UOM:39015025177364

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Electromagnetic Scattering by Coated Convex Surfaces and Wedges Simulated by Approximate Boundary Conditions by Hasnain H. Syed Pdf

Author : United States. National Bureau of Standards
Publisher : Unknown
Page : 1400 pages
File Size : 48,5 Mb
Release : 1964
Category : Ionospheric radio wave propagation
ISBN : IND:30000089780534

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Journal of Research, National Bureau of Standards by United States. National Bureau of Standards Pdf

Author : United States. National Bureau of Standards
Publisher : Unknown
Page : 914 pages
File Size : 46,5 Mb
Release : 1960
Category : Ionospheric radio wave propagation
ISBN : UCAL:B3515578

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Journal of Research by United States. National Bureau of Standards Pdf

Author : Lal Chand Godara
Publisher : CRC Press
Page : 936 pages
File Size : 52,7 Mb
Release : 2018-10-03
Category : Technology & Engineering
ISBN : 9781420042146

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Handbook of Antennas in Wireless Communications by Lal Chand Godara Pdf

The move toward worldwide wireless communications continues at a remarkable pace, and the antenna element of the technology is crucial to its success. With contributions from more than 30 international experts, the Handbook of Antennas in Wireless Communications brings together all of the latest research and results to provide engineering professionals and students with a one-stop reference on the theory, technologies, and applications for indoor, hand-held, mobile, and satellite systems. Beginning with an introduction to wireless communications systems, it offers an in-depth treatment of propagation prediction and fading channels. It then explores antenna technology with discussion of antenna design methods and the various antennas in current use or development for base stations, hand held devices, satellite communications, and shaping beams. The discussions then move to smart antennas and phased array technology, including details on array theory and beamforming techniques. Space diversity, direction-of-arrival estimation, source tracking, and blind source separation methods are addressed, as are the implementation of smart antennas and the results of field trials of systems using smart antennas implemented. Finally, the hot media topic of the safety of mobile phones receives due attention, including details of how the human body interacts with the electromagnetic fields of these devices. Its logical development and extensive range of diagrams, figures, and photographs make this handbook easy to follow and provide a clear understanding of design techniques and the performance of finished products. Its unique, comprehensive coverage written by top experts in their fields promises to make the Handbook of Antennas in Wireless Communications the standard reference for the field.

Author : Anonim
Publisher : Unknown
Page : 1264 pages
File Size : 55,8 Mb
Release : 1967
Category : Aeronautics
ISBN : OSU:32435062863618

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OAR Cumulative Index of Research Results by Anonim Pdf