Download or read book A Geometrical Theory of Diffraction Study of Electromagnetic Scattering from Slotted Cylinders written by John Desmond Cashman and published by . This book was released on 1978 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geometrical Theory of Diffraction for Electromagnetic Waves written by Graeme L. James and published by IET. This book was released on 1986 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Wideband Electromagnetic Scattering Analysis Program Far Zone Electromagnetic Scattering from Complex Shapes Using Geometrical Theory of Diffraction written by and published by . This book was released on 1992 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: Backscatter and bistatic scattering in the far zone using the uniform theory of diffraction (UTD) from shapes which require second and higher order interactions to get an accurate solution over a wide range of angles is considered. One of the simplest of these shapes is the two-dimensional dihedral. The solution contains interactions of up to third order, which provide excellent results for the dihedrals of 60 deg or greater and for sizes larger than one wavelength in extent. The dihedral solution is modified for curvature and caustic corrections to get results for the top-hat, bruderhedral, and bi-cone. Another extension to the dihedral is the parallel plate cavity and the circular cavity. First and second order caustic corrections for the donut are included. Also, the result of the dihedral is modified to get results for the multi-joined cylinders made of PVC pipes filled with absorber. Analytical results are validated against method of moments or measurements.
Download or read book Balanis Advanced Engineering Electromagnetics written by Constantine A. Balanis and published by John Wiley & Sons. This book was released on 2023-12-22 with total page 1140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Balanis’ Advanced Engineering Electromagnetics The latest edition of the foundational guide to advanced electromagnetics Balanis’ third edition of Advanced Engineering Electromagnetics - a global best-seller for over 30 years - covers the advanced knowledge engineers involved in electromagnetics need to know, particularly as the topic relates to the fast-moving, continuously evolving, and rapidly expanding field of wireless communications. The immense interest in wireless communications and the expected increase in wireless communications systems projects (antennas, microwaves and wireless communications) points to an increase in the number of engineers needed to specialize in this field. Highlights of the 3rd Edition include: A new chapter, on Artificial Impedance Surfaces (AIS), contains material on current and advanced EM technologies, including the exciting and fascinating topic of metasurfaces for: Control and broadband RCS reduction using checkerboard designs. Optimization of antenna fundamental parameters, such as: input impedance, directivity, realized gain, amplitude radiation pattern. Leaky-wave antennas using 1-D and 2-D polarization diverse-holographic high impedance metasurfaces for antenna radiation control and optimization. Associated MATLAB programs for the design of checkerboard metasurfaces for RCS reduction, and metasurface printed antennas and holographic L WA for radiation control and optimization. Throughout the book, there are: Additional examples, numerous end-of-chapter problems, and PPT notes. Fifty three MATLAB computer programs for computations, graphical visualizations and animations. Nearly 4,500 multicolor PowerPoint slides are available for self-study or lecture use.
Download or read book Geometrical Theory of Diffraction written by Vladimir Andreevich Borovikov and published by IET. This book was released on 1994 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book details the ideas underlying geometrical theory of diffraction (GTD) along with its relationships with other EM theories.
Download or read book Far Zone Electromagnetic Scattering from Complex Shapes Using Geometrical Theory of Diffraction written by Najam Akhter and published by . This book was released on 1993 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Radiation from Slots on Cylindrical Bodies Using Geometrical Theory of Diffraction and Creeping Wave Theory written by Constantine A. Balanis and published by . This book was released on 1970 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: A hybrid solution employing wedge diffraction and creeping wave theories is used to compute the radiation patterns of axial and circumferential slots in the principal planes (equatorial and elevation) on conducting cylinders of finite and infinite lengths. The slots are excited by parallel-plate waveguides operating in the TEM and TE10 modes. For the equatorial-plane pattern, the total field in the lit region is obtained by the superposition of two fields, that is, the wedge-diffracted and the creeping-wave fields. The wedge-diffracted field is obtained by approximating the parallel-plate --cylinder geometry with two wedges, each formed by a wall of the waveguide and a tangent plane to the cylinder surface at the edge point. The creeping-wave contribution is obtained by the use of diffraction and propagation coefficients of waves traveling around conducting curved surfaces. The total field in the shadow region is obtained solely from the creeping-wave contribution. For the elevation-plane pattern, wedge diffraction techniques for the entire pattern are employed. The main advantages of the present technique are that it can be applied to geometries where modal solutions are not possible, in numerical ranges where the convergence properties of modal expansions are relatively poor, in parametric design problems since the contribution from each field is separated, and in the analysis of antenna with finite physical sizes.
Download or read book Application of the Uniform Theory of Diffraction to the Electromagnetic Scattering of a Circular Cylinder Over a Half space written by Manuel B. Abello and published by . This book was released on 1997 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geometrical theory of diffraction for electromagnetic scattering by a thin wire of finite length written by D. A. Moody and published by . This book was released on 1978 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Classical and Modern Diffraction Theory written by Kamill Klem-Musatov and published by SEG Books. This book was released on 2016-06-30 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing geophysicists with an in-depth understanding of the theoretical and applied background for the seismic diffraction method, “Classical and Modern Diffraction Theory” covers the history and foundations of the classical theory and the key elements of the modern diffraction theory. Chapters include an overview and a historical review of classical theory, a summary of the experimental results illustrating this theory, and key principles of the modern theory of diffraction; the early cornerstones of classical diffraction theory, starting from its inception in the 17th century and an extensive introduction to reprinted works of Grimaldi, Huygens, and Young; details of the classical theory of diffractions as developed in the 19th century and reprinted works of Fresnel, Green, Helmholtz, Kirchhoff, and Rayleigh; and the cornerstones of the modern theory including Keller’s geometrical theory of diffraction, boundary-layer theory, and super-resolution. Appendices on the Cornu spiral and Babinet’s principle are also included.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wideband Electromagnetic Scattering Analysis Program A Caustic Corrected Uniform Geometrical Theory of Diffraction for Evaluating High Frequency Electromagnetic Fields Near the Cusp of the Caustic Caused by the Curvature of an Edge written by and published by . This book was released on 1994 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: An improvement to the Uniform Geometrical Theory of Diffraction (UTD) is developed for determining the high frequency electromagnetic fields near the caustic caused by the curvature of an edge. Although the classic UTD correctly compensates for the discontinuities of the Geometrical Optics fields, it does not correct for caustics created by a curved edge. In particular, for a flat plate with a curved edge that is symmetric about a line, a caustic will occur for a source or observer, when two or more diffraction points merge. This work is devoted to the development of a caustic corrected UTD solution. This means that uniform asymptotic techniques are used to obtain a solution that reduces to the classical UTD result away from, is bounded near, and reduces to the known result at the caustic. Results are calculated for several geometries and compared with the Method of Moments. The results are shown to be in excellent agreement in the caustic regions and smoothly reduce to the UTD away from the caustic regions. Finally, the resulting solution is a very fast and efficient way of computing the high frequency field diffracted by a curved edge due to its ray optical nature.
Download or read book Canonical Problems in Scattering and Potential Theory Part II written by S.S. Vinogradov and published by CRC Press. This book was released on 2002-04-29 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although the analysis of scattering for closed bodies of simple geometric shape is well developed, structures with edges, cavities, or inclusions have seemed, until now, intractable to analytical methods. This two-volume set describes a breakthrough in analytical techniques for accurately determining diffraction from classes of canonical scatterers
Download or read book Application of the Geometrical Theory of Diffraction to Plane Wave Scattering by an End capped Cylinder written by Todd A. Pitts and published by . This book was released on 1992 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scattering of Electromagnetic Radiation by Apertures VIII The Normally Slotted Cylinder Theory written by R. L. Kligman and published by . This book was released on 1974 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents as an introduction, a preliminary statement describing the research program on scattering by cylindrical systems. This is followed by a formal derivation of the expressions for the scattered fields in terms of the currents induced on a normally slotted, conducting, infinite cylinder irradiated by a linearly polarized, monochromatic plane electromagnetic wave. Following this the authors present an alternate formal solution to the same scattering problem in terms of the tangential components of the electric field over the aperture or slot region. (Author).
Download or read book Electromagnetic Diffraction Modeling and Simulation with MATLAB written by Gökhan Apaydin and published by Artech House Publishers. This book was released on 2021 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: This exciting new resource presents a comprehensive introduction to the fundamentals of diffraction of two-dimensional canonical structures, including wedge, strip, and triangular cylinder with different boundary conditions. Maxwell equations are discussed, along with wave equation and scattered, diffracted and fringe fields. Geometric optics, as well as the geometric theory of diffraction are explained. With MATLAB scripts included for several well-known electromagnetic diffraction problems, this book discusses diffraction fundamentals of two-dimensional structures with different boundary conditions and analytical numerical methods that are used to show diffraction.
Download or read book Analysis of a Conformal Receiving Array of Slots in a Perfectly Conducting Circular Cylinder by the Geometrical Theory of Diffraction written by P. H. Pathak and published by . This book was released on 1975 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report deals with an analysis of the voltages received by a conformal array of rectangular slots in a circular cylinder when it is illuminated by an electromagnetic plane wave. The received voltages are calculated via an admittance matrix formulation; this formulation requires a knowledge of the array admittance matrix whose elements contain the external aperture self and mutual admittances, respectively, and a matrix whose elements contain the short circuit modal currents induced in the slot apertures by the incoming plane wave. The induced short circuit currents and the external mutual admittances are very simply and accurately found via the geometrical theory of diffraction (GTD). Even though the GTD is a high frequency method, the GTD results employed herein are expected to be quite accurate for cylinders as small as three wavelengths in circumference. The analysis given in this report is based on the dominant mode approximation for the electric field in the slot apertures. Numerical results are presented for the voltages received by a three or four element slot array as a function of the angle of arrival (in azimuth) of the incoming plane wave. Axial, circumferential and inclined (45 deg) slot arrays are considered. It appears that such an array of slots in a cylinder can be effectively employed for the purposes of direction finding. (Author).
