Antennas And Wave Propagation

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Antennas And Wave Propagation

Antennas And Wave Propagation

  • Author: K.A.Bakshi A.V.Bakshi U.A.Bakshi
  • Publisher: Technical Publications
  • ISBN: 9788184312782
  • Category:
  • Page: 432
  • View: 964
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Antenna Fundamentals Introduction, Radiation mechanism - Single wire, 2 wire, Dipoles, Current distribution on a thin wire antenna. Antenna parameters - Radiation patterns, Patterns in principal planes, Main lobe and side lobes, Beamwidths, Beam area, Radiation intensity, Beam efficiency, Directivity, Gain and resolution, Antenna apertures, Aperture efficiency, Effective height related problems.Thin Linear Wire AntennasRetarded potentials, Radiation from small electric dipole, Quarterwave monopole and halfwave dipole - Current distributions, Evaluation of field components, Power radiated, Radiation resistance, Beamwidths, Directivity, Effective area and effective height. Natural current distributions, Fields and patterns of thin linear center-fed antennas of different lengths, Radiation resistance at a point which is not current maximum. Antenna theorems - Applicability and proofs for equivalence of directional characteristics, Loop antennas : Small loops - Field components, Comparison of far fields of small loop and short dipole, Concept of short magnetic dipole, D and R relations for small loops.Antenna Arrays2 element arrays - Different cases, Principle of pattern multiplication, N element uniform linear arrays - Broadside, Endfire arrays, EFA with increased directivity, Derivation of their characteristics and comparison; Concept of scanning arrays, Directivity relations (no derivations), Related problems, Binomial arrays, Effects of uniform and non-uniform amplitude distributions, Design relations.Non-Resonant RadiatorsIntroduction, Travelling wave radiators - Basic concepts, Longwire antennas - Field strength calculations and patterns, V-antennas, Rhombic antennas and design relations, Broadband antennas : Helical antennas - Significance, Geometry, Basic properties; Design considerations for monofilar helical antennas in axial mode and normal modes (Qualitative treatment).VHF, UHF and Microwave Antennas - IArrays with parasitic elements, Yagi-Uda arrays, Folded dipoles and their characteristics.Reflector antennas Flat sheet and corner reflectors, Paraboloidal reflectors - Geometry, Characteristics, Types of feeds, F/D ratio, Spill over, Back lobes, Aperture blocking, Off-set feeds, Cassegrainian feeds.VHF, UHF and Microwave Antennas - IIHorn antennas - Types, Optimum horns, Design characteristics of pyramidal horns; Lens antennas - Geometry, Features, Dielectric lenses and zoning, Applications.Antenna measurements - Patterns required, setup, Distance criterion, Directivity and gain measurements (Comparison, Absolute and 3-Antenna methods).Wave Propagation - IConcepts of propagation, Frequency ranges and types of propagations. Ground wave propagation - Characteristics, Parameters, Wave tilt, Flat and spherical earth considerations. Sky wave propagation - Formation of ionospheric layers and their characteristics, Mechanism of reflection and refraction, Critical frequency, MUF and skip distance - Calculations for flat and spherical earth cases, Optimum frequency, LUHF, Virtual height, Ionospheric abnormalities, Ionospheric absorption.Wave Propagation - IIFundamental equation for free-space propagation, Basic transmission loss calculations. Space wave propagation - Mechanism, LOS and radio horizon. Tropospheric wave propagation - Radius of curvature of path, Effective earth's radius, Effect of earth's curvature, Field strength calculations, M-curves and Duct propagation, Tropospheric scattering.

Applying Elliot Wave Theory Profitably

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Applying Elliot Wave Theory Profitably

Applying Elliot Wave Theory Profitably

  • Author: Steven W. Poser
  • Publisher: John Wiley & Sons
  • ISBN: 9780471420071
  • Category: Business & Economics
  • Page: 222
  • View: 5910
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Learn how to forecast the market with Elliott Wave Theory In Applying Elliott Wave Theory Profitably author Steven Poser shows readers how to trade using Elliott Wave Theory–a powerful technical analysis tool used to forecast the stock market–through easy–to–follow trading strategies, while offering clear explanations on how to interpret this method′s numerous patterns. Step–by–step guidance breaks down the Elliott Wave Theory and provides strategies that a trader can put into action along with a complete explanation of how and why the Elliott Wave Theory works. Applying Elliott Wave Theory Profitably shows readers where to look for external clues, and how to use these to improve their trading performance. Steven W. Poser (Upper Saddle River, NJ) is President and founder of Poser Global Market Strategies Inc., an international stock, bond, and currency markets trading advisory firm. Mr. Poser publishes a daily newsletter that covers these markets from a technical and fundamental perspective. He holds a post–MBA degree in finance, as well as an MBA in economics and a BA in mathematics and computer science.

Mathematics of Wave Propagation

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Mathematics of Wave Propagation

Mathematics of Wave Propagation

  • Author: Julian L. Davis
  • Publisher: Princeton University Press
  • ISBN: 9780691026435
  • Category: Mathematics
  • Page: 395
  • View: 2864
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Earthquakes, a plucked string, ocean waves crashing on the beach, the sound waves that allow us to recognize known voices. Waves are everywhere, and the propagation and classical properties of these apparently disparate phenomena can be described by the same mathematical methods: variational calculus, characteristics theory, and caustics. Taking a medium-by-medium approach, Julian Davis explains the mathematics needed to understand wave propagation in inviscid and viscous fluids, elastic solids, viscoelastic solids, and thermoelastic media, including hyperbolic partial differential equations and characteristics theory, which makes possible geometric solutions to nonlinear wave problems. The result is a clear and unified treatment of wave propagation that makes a diverse body of mathematics accessible to engineers, physicists, and applied mathematicians engaged in research on elasticity, aerodynamics, and fluid mechanics. This book will particularly appeal to those working across specializations and those who seek the truly interdisciplinary understanding necessary to fully grasp waves and their behavior. By proceeding from concrete phenomena (e.g., the Doppler effect, the motion of sinusoidal waves, energy dissipation in viscous fluids, thermal stress) rather than abstract mathematical principles, Davis also creates a one-stop reference that will be prized by students of continuum mechanics and by mathematicians needing information on the physics of waves.

Ocean Wave Energy

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Ocean Wave Energy

Ocean Wave Energy

Current Status and Future Prespectives

  • Author: Joao Cruz
  • Publisher: Springer Science & Business Media
  • ISBN: 9783540748953
  • Category: Technology & Engineering
  • Page: 431
  • View: 9725
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The authors of this timely reference provide an updated and global view on ocean wave energy conversion – and they do so for wave energy developers as well as for students and professors. The book is orientated to the practical solutions that this new industry has found so far and the problems that any device needs to face. It describes the actual principles applied to machines that convert wave power to electricity and examines state-of-the-art modern systems.

The Application of Stress-wave Theory to Piles

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The Application of Stress-wave Theory to Piles

The Application of Stress-wave Theory to Piles

Science, Technology and Practice : Proceedings of the 8th International Conference on the Application of Stress-Wave Theory to Piles : Lisbon, Portugal, 8-10 September 2008

  • Author: Jaime Alberto dos Santos
  • Publisher: IOS Press
  • ISBN: 9781586039097
  • Category: Technology & Engineering
  • Page: 749
  • View: 3471
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"This conference was organized by Instituto Superior Tecnico under the auspices of: International Society of Soil mechanics and Geotechnical Engineering -- ISSMGE, TC18 on Deep Foundations and the Portuguese Geotechnical Society."--T.p. verso.

Square-Wave Voltammetry

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Square-Wave Voltammetry

Square-Wave Voltammetry

Theory and Application

  • Author: Valentin Mirceski,Sebojka Komorsky-Lovric,Milivoj Lovric
  • Publisher: Springer Science & Business Media
  • ISBN: 3540737391
  • Category: Science
  • Page: 201
  • View: 4700
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In a real tour-de-force of scientific publishing, three distinguished experts here systematically deliver both the underlying theory and the practical guidance needed to effectively apply square-wave voltammetry techniques. Square-wave voltammetry is a technique used in analytical applications and fundamental studies of electrode mechanisms. In order to take full advantage of this technique, a solid understanding of signal generation, thermodynamics, and kinetics is essential. Not only does this book cover all the necessary background and basics, but it also offers an appendix on mathematical modeling plus a chapter on electrode mechanisms that briefly reviews the numerical formulae needed to simulate experiments using popular software tools.

Shock Wave Reflection Phenomena

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Shock Wave Reflection Phenomena

Shock Wave Reflection Phenomena

  • Author: Gabi Ben-Dor
  • Publisher: Springer Science & Business Media
  • ISBN: 3540713824
  • Category: Science
  • Page: 342
  • View: 3845
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This book is a comprehensive state-of-the-knowledge summation of shock wave reflection phenomena from a phenomenological point of view. It includes a thorough introduction to oblique shock wave reflections, dealing with both regular and Mach types. It also covers in detail the corresponding two- and three-shock theories. The book moves on to describe reflection phenomena in a variety of flow types, as well as providing the resolution of the Neumann paradox.

Seismic Wave Propagation and Scattering in the Heterogenous Earth

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Seismic Wave Propagation and Scattering in the Heterogenous Earth

Seismic Wave Propagation and Scattering in the Heterogenous Earth

  • Author: Haruo Sato,Michael C. Fehler
  • Publisher: Springer Science & Business Media
  • ISBN: 3540896236
  • Category: Science
  • Page: 308
  • View: 6342
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Seismic waves – generated both by natural earthquakes and by man-made sources – have produced an enormous amount of information about the Earth's interior. In classical seismology, the Earth is modeled as a sequence of uniform horizontal layers (or sperical shells) having different elastic properties and one determines these properties from travel times and dispersion of seismic waves. The Earth, however, is not made of horizontally uniform layers, and classic seismic methods can take large-scale inhomogeneities into account. Smaller-scale irregularities, on the other hand, require other methods. Observations of continuous wave trains that follow classic direct S waves, known as coda waves, have shown that there are heterogeneities of random size scattered randomly throughout the layers of the classic seismic model. This book focuses on recent developments in the area of seismic wave propagation and scattering through the randomly heterogeneous structure of the Earth, with emphasis on the lithosphere. The presentation combines information from many sources to present a coherent introduction to the theory of scattering in acoustic and elastic materials and includes analyses of observations using the theoretical methods developed.

Shock-Wave Phenomena and the Properties of Condensed Matter

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Shock-Wave Phenomena and the Properties of Condensed Matter

Shock-Wave Phenomena and the Properties of Condensed Matter

  • Author: Gennady I. Kanel,Sergey V. Razorenov,Vladimir E. Fortov,V. E. Fortov
  • Publisher: Springer Science & Business Media
  • ISBN: 9780387205724
  • Category: Science
  • Page: 322
  • View: 1383
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One of the main goals of investigations of shock-wave phenomena in condensed matter is to develop methods for predicting effects of explosions, high-velocity collisions, and other kinds of intense dynamic loading of materials and structures. Based on the results of international research conducted over the past 30 years, this book is addressed not only to experts in shock-wave physics, but also to interested representatives from adjacent fields of activity and to students who seek an introduction to the current issues. With that goal in mind, the book opens with a brief account of the theoretical background and a short description of experimental techniques. The authors then progress to a systematic treatment of special topics, some of which have not been fully addressed in the literature to date.

Antenna And Wave Propagation

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Antenna And Wave Propagation

Antenna And Wave Propagation

  • Author: U.A.Bakshi,A.V.Bakshi
  • Publisher: Technical Publications
  • ISBN: 9788184317220
  • Category:
  • Page: 472
  • View: 507
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