Scattering Cross Section of Unequal Length Dipole Arrays
Scattering Cross Section of Unequal Length Dipole Arrays

Author: Hema Singh

Publisher: Springer

Published: 2015-09-28

Total Pages: 56

ISBN-13: 9812877908

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This book presents a detailed and systematic analytical treatment of scattering by an arbitrary dipole array configuration with unequal-length dipoles, different inter-element spacing and load impedance. It provides a physical interpretation of the scattering phenomena within the phased array system. The antenna radar cross section (RCS) depends on the field scattered by the antenna towards the receiver. It has two components, viz. structural RCS and antenna mode RCS. The latter component dominates the former, especially if the antenna is mounted on a low observable platform. The reduction in the scattering due to the presence of antennas on the surface is one of the concerns towards stealth technology. In order to achieve this objective, a detailed and accurate analysis of antenna mode scattering is required. In practical phased array, one cannot ignore the finite dimensions of antenna elements, coupling effect and the role of feed network while estimating the antenna RCS. This book presents the RCS estimation of an array with unequal-length dipoles. The signal reflections within the antenna system and the mutual coupling effect are considered to arrive at the total RCS for series and parallel feed. The computations are valid for any arbitrary array configurations, including side-by-side arrangement, parallel-in-echelon, etc.

RCS Estimation of Linear and Planar Dipole Phased Arrays: Approximate Model
RCS Estimation of Linear and Planar Dipole Phased Arrays: Approximate Model

Author: Hema Singh

Publisher: Springer

Published: 2015-10-01

Total Pages: 61

ISBN-13: 9812877541

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In this book, the RCS of a parallel-fed linear and planar dipole array is derived using an approximate method. The signal propagation within the phased array system determines the radar cross section (RCS) of phased array. The reflection and transmission coefficients for a signal at different levels of the phased-in scattering array system depend on the impedance mismatch and the design parameters. Moreover the mutual coupling effect in between the antenna elements is an important factor. A phased array system comprises of radiating elements followed by phase shifters, couplers, and terminating load impedance. These components lead to respective impedances towards the incoming signal that travels through them before reaching receive port of the array system. In this book, the RCS is approximated in terms of array factor, neglecting the phase terms. The mutual coupling effect is taken into account. The dependence of the RCS pattern on the design parameters is analyzed. The approximate model is established as an efficient method for RCS estimation of phased arrays. This book presents a detailed formulation of approximate method to determine RCS of phased arrays, which is explained using schematics and illustrations. This book should help the reader understand the impinging signal path and its reflections/transmissions within the phased array system.

Active Radar Cross Section Reduction
Active Radar Cross Section Reduction

Author: Hema Singh

Publisher: Cambridge University Press

Published: 2015-03-02

Total Pages: 354

ISBN-13: 1107092612

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This book discusses the active and passive radar cross section (RCS) estimation and techniques to examine the low observable aerospace platforms. It begins with the fundamentals of RCS, followed by the dielectric, magnetic and metamaterials parameters of the constituent materials and then explains various methods and the emerging trends followed in this area of study. The RCS estimation of phased array including the mutual coupling effect is also presented in detail in the book. The active RCS reduction is carefully touched upon through the performance of phased arrays, sidelobe cancellers and mitigation of multipath effect. Providing information on various adaptive algorithms like least mean square (LMS), recursive least square (RLS) and weighted least square algorithms, the authors also mention the recent developments in the area of embedded antennas, conformal load bearing antenna, metamaterials and frequency selective surface (FSS) based RCS reduction.

Nanomaterials Chemistry
Nanomaterials Chemistry

Author: C. N. R. Rao

Publisher: John Wiley & Sons

Published: 2007-09-24

Total Pages: 420

ISBN-13: 3527611371

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With this handbook, the distinguished team of editors has combined the expertise of leading nanomaterials scientists to provide the latest overview of this field. They cover the whole spectrum of nanomaterials, ranging from theory, synthesis, properties, characterization to application, including such new developments as quantum dots, nanoparticles, nanoporous materials, nanowires, nanotubes, and nanostructured polymers. The result is recommended reading for everybody working in nanoscience: Newcomers to the field can acquaint themselves with this exciting subject, while specialists will find answers to all their questions as well as helpful suggestions for further research.

The Cosmic Dust Connection
The Cosmic Dust Connection

Author: J. Mayo Greenberg

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 532

ISBN-13: 9401156522

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Solid particles are followed from their creation through their evolution in the Galaxy to their participation in the formation of solar systems like our own, these being now clearly deduced from observations by the Hubble Space Telescope as well as by IR and visual observations of protostellar disks, like that of the famous Beta Pictoris object. The most recent observational, laboratory and theoretical methods are examined in detail. In our own solar system, studies of meteorites, comets and comet dust reveal many features that follow directly from the interstellar dust from which they formed. The properties of interstellar dust provide possible keys to its origin in comets and asteroids and its ultimate origin in the early solar system. But this is a continuing story: what happens to the solid particles in space after they emerge from stellar sources has important scientific consequences since it ultimately bears on our own origins - the origins of solar systems and, especially, of our own earth and life in the universe.

Progress in Materials and Processes
Progress in Materials and Processes

Author: Zhi Ming Shi

Publisher: Trans Tech Publications Ltd

Published: 2012-12-13

Total Pages: 2328

ISBN-13: 3038139246

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Selected papers from the 2nd International Conference on Materials and Products Manufacturing Technology (ICMPMT 2012) September 22-23, 2012, Guangzhou, China

Plasmonic Nanoguides and Circuits
Plasmonic Nanoguides and Circuits

Author: Sergey Bozhevolnyi

Publisher: CRC Press

Published: 2019-05-08

Total Pages: 324

ISBN-13: 0429533640

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In this book, the authors concentrate on the surface Plasmon (SP) waveguide configurations ensuring nanoscale confinement and review the current status of this rapidly emerging field, considering different configurations being developed for nanoscale plasmonic guides and circuits. Both fundamental physics and application aspects of plasmonics are reviewed in detail by the world's leading experts. A unique feature of this book is its strong focus on a particular subfield of plasmonics dealing with subwavelength (nanoscale) waveguiding, an area which is especially important in view of the explosively growing interest in plasmonic interconnects and nanocircuits.