Diffraction of an Electromagnetic Plane Wave by a Conducting Wedge PDF Download

Author: John I. Makhoul
Publisher:
ISBN:
Category : Diffraction
Languages : en
Pages : 142

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Author: John L. Makhoul
Publisher:
ISBN:
Category :
Languages : en
Pages : 71

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The electromagnetic fields diffracted by a two-dimensional perfectly conducting wedge are calculated for impulse and unit-step plane wave excitations, and for TE and TM polarizations. The time-dependent solutions obtained are in closed form. Contours of the field component parallel to the edge of the wedge are plotted for unit-step excitation using different wedge angles and different angles of incidence, and for both polarizations. ''Short time'' approximations of the fields in the time domain are compared with asymptotic expansions of the far field in the frequency domain. A method for approximating the fields diffracted by a wedge is developed by redefining the incident field on one side of the wedge and calculating the currents on the surface by the geometrical optics approximation. The currents thus calculated are compared with the exact currents for impulse and unit-step excitations. (Author).

Author: Y. M. Hwang
Publisher:
ISBN:
Category : Antennas (Electronics)
Languages : en
Pages : 102

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The diffraction of an electromagnetic wave by a perfectly-conducting right-angled wedge with one surface covered by a dielectric slab or absorber is considered. The effect of the coated surface is approximated by a uniform surface impedance. The solution of the normally incident electromagnetic problem is facilitated by introducing two scalar fields which satisfy a mixed boundary condition on one surface of the wedge and a Neumann of Dirichlet boundary condition on the other. A functional transformation is employed to simplify the boundary conditions so that eigenfunction expansions can be obtained for the resulting Green's functions. The eigenfunction expansions are transformed into the integral representations which then are evaluated asymptotically by the modified Pauli-Clemmow method of steepest descent. A far zone approximation is made to obtain the scattered field from which the diffraction coefficient is found for scalar plane, cylindrical or sperical wave incident on the edge. With the introduction of a ray-fixed coordinate system, the dyadic diffraction coefficient for plane or cylindrical EM waves normally indicent on the edge is reduced to the sum of two dyads which can be written alternatively as a 2 X 2 diagonal matrix.

Author: Sam Karp
Publisher:
ISBN: 9781332120789
Category : Science
Languages : en
Pages : 32

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Excerpt from Diffraction by a Tipped Wedge: With Applications to Blunt Edges Diffraction By a Tipped Wedge: With Applications to Blunt Edges was written by Sam Karp. This is a 32 page book, containing 4745 words and 8 pictures. Search Inside is enabled for this title. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Author: Graeme L. James
Publisher: IET
ISBN: 9780863410628
Category : Science
Languages : en
Pages : 312

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The purpose of the book, apart from expounding the Geometrical Theory of Diffraction (GTD) method, is to present useful formulations that can be readily applied to solve practical engineering problems.

Author: G. A. Grinberg
Publisher:
ISBN:
Category : Differential equations
Languages : en
Pages : 40

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While the question of electromagnetic wave propagation from an arbitrary system of radiators in a space of two or more homogeneous, isotropic media with plane-parallel separating surfaces can be considered completely solved, the analogous problem, corresponding to the case of two or a larger number of media with plane but not parallel, separating surfaces appears to be incomparably more complex. Up until the present, a rigorous solution has not been given successfully, even for the simplest problem of this type - the problem of the diffraction of electromagnetic waves by a wedge of material, possessing finite conductivity, in a vacuum or in a homogeneous medium.

Author: Robert Arthur Yates
Publisher:
ISBN:
Category : Boundary value problems
Languages : en
Pages : 238

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Author: Frank Karal
Publisher: Forgotten Books
ISBN: 9780656200757
Category : Mathematics
Languages : en
Pages : 82

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Excerpt from Diffraction of a Skew Plane Electromagnetic Wave by an Absorbing Right-Angled Wedge Considerably more difficult due to the vectorial character of the boundary condi tions. In Section 3 the procedure in our vectorial problem is described more fully, with an explanation of how the method of separation of variables plus proper consideration of edge behavior leads to a unique solution under conditions which are physically meaningful. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Author: Vito G. Daniele
Publisher: John Wiley & Sons
ISBN: 1119780063
Category : Science
Languages : en
Pages : 240

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Book Description
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: Kuo-Chun Lang
Publisher:
ISBN:
Category :
Languages : en
Pages : 129

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This theoretical study provides a pictorial view of the multi-wedge diffraction phenomenon. Physical insight into the scattered field from the second wedge can be gained from these results. Furthermore, because the problem is considered with general boundary conditions, this analysis also provides qualitative information on the effects of physical parameters such as the angle of incidence of plane wave, the surface impedances on the facets of each wedge, etc. on the multi-diffracted field. By varying these parameters, the solution automatically reduces to that of a class of well-known problems; for example, the diffraction of plane wave by two conducting half-planes, etc. In addition to its theoretical significance, the analysis of this problem can also be of great practical value. In the problem of electromagnetic wave propagation over irregular terrains, one usually approximates such irregularities as hills and mountain ridges by knife-wedges. With the aid of the general representation of the scattered wave obtained herein, a comprehensive understanding of the effects of successive obstacles on electromagnetic wave propagation can be acquired. (Author).