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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 48
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Book Description
This paper reviews the literature on radar (microwave) absorbing materials. Introductory sections include a history of research & development of such materials since the late 1930s and an overview of the theory behind the interaction of electromagnetic radiation with matter, with consideration of several aspects of reflectivity minimization. Section 4 reviews the types of radar absorbing material, including graded interfaces, resonant materials such as the Salisbury screen, circuit analogue absorbers, and magnetic absorbers. Section 5 presents a simple procedure for calculating the reflectivity from a multi-layer material and section 6 contains background on transmission line theory, which has been used to model & optimize absorbers. Finally, the report reviews the properties of absorbing materials such as carbon, conducting polymers, and composites.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 48
Get Book Here
Book Description
This paper reviews the literature on radar (microwave) absorbing materials. Introductory sections include a history of research & development of such materials since the late 1930s and an overview of the theory behind the interaction of electromagnetic radiation with matter, with consideration of several aspects of reflectivity minimization. Section 4 reviews the types of radar absorbing material, including graded interfaces, resonant materials such as the Salisbury screen, circuit analogue absorbers, and magnetic absorbers. Section 5 presents a simple procedure for calculating the reflectivity from a multi-layer material and section 6 contains background on transmission line theory, which has been used to model & optimize absorbers. Finally, the report reviews the properties of absorbing materials such as carbon, conducting polymers, and composites.
Author: K.J. Vinoy
Publisher: Springer
ISBN: 9781461304739
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
Due to its extensive applications in stealth technology, much of the research effort in radar absorbing materials (RAM) has remained classified. As is the wont with classified topics, it has resulted in much awe and unfounded speculation. The aim of this book is to demystify this topic. The book in hand is concise but complete in itself. The attention of the readers is first drawn towards the historical evolution of RAM to emphasize that the elementary principles of electromagnetics lead to the fundamental concepts of RAM. These also form the basis for further mathematical analysis and design of RAM. The performance plots for the various RAM designs, to the extent possible, are taken with respect to power reflection; this should facilitate comparison of their relative performances. In order to further induce the reader to take the first step towards RAM design, we have included the relevant computer codes in a companion diskette. This would enable the reader to try out elementary designs on his own. * .EXE files should facilitate ready execution of codes on most DOS based computing platforms. The corresponding source codes with comments are also included as * .FOR files. The reader may wish to modify some of these codes for examining RAM design algorithms further. We welcome comments from the reader on these codes.
Author: K.J. Vinoy
Publisher: Springer
ISBN:
Category : Political Science
Languages : en
Pages : 216
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Book Description
Radar absorbing materials offers an electromagnetic (EM) perspective to the evolution of radar absorbing materials (RAM). The major aspects covered are the EM analysis, design, fabrication and characterization of RAM. This is followed by an exhaustive discussion on the application areas and current trends in RAM. All the major aspects of RAM technology are covered in this book. The analytical techniques are developed from first principles.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 23
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Book Description
The ability of a material to absorb radar waves (microwave radiation) depends on the permittivity & permeability of the material and its structure. A multilayer structure of alternating resistive sheets & low dielectric spacers has been found to make an effective radar absorber if the layers are spaced a quarter wavelength apart and the resistance of the sheets has specific values. To make a multilayer absorber with the widest possible bandwidth, it is necessary to use an optimization technique due to the complexity of the equations describing the reflectivity from an absorber. This paper reviews optimal design techniques for multilayer microwave absorbers. These methods include analytical approximations, gradient optimization routines, simulated annealing, and the genetic algorithm. Particular attention is paid to the genetic algorithm, a highly parallel stochastic technique that permits multi-objective optimization and has a high probability of finding the global minimum.
Author: Yuping Duan
Publisher: CRC Press
ISBN: 1315341034
Category : Science
Languages : en
Pages : 382
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Book Description
With the phenomenal development of electromagnetic wave communication devices and stealth technology, electromagnetic wave absorbing materials have been attracting attention as antielectromagnetic interference slabs, stealth materials, self-concealing technology, and microwave darkrooms. This book starts with the fundamental theory of electromagnetic wave absorption in loss medium space, followed by a discussion of different microwave absorbents, such as manganese dioxide, iron-based composite powder, conductive polyaniline, barium titanate powder, and manganese nitride. Then, structural absorbing materials are explored, including multilayer materials, new discrete absorbers, microwave absorption coatings, cement-based materials, and structural pyramid materials. Many of the graphics demonstrate not only the principles of physics and experimental results but also the methodology of computing. The book will be useful for graduate students of materials science and engineering, physics, chemistry, and electrical and electronic engineering; researchers in the fields of electromagnetic functional materials and nanoscience; and engineers in the fields of electromagnetic compatibility and stealth design.
Author: Runa Kumari
Publisher: Springer Nature
ISBN: 9811522677
Category : Technology & Engineering
Languages : en
Pages : 205
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Book Description
This volume covers the recent advances and research on the modeling and simulation of materials. The primary aim is to take the reader through the mathematical analysis to the theories of electricity and magnetism using multiscale modelling, covering a variety of numerical methods such as finite difference time domain (FDTD), finite element method (FEM) and method of moments. The book also introduces the multiscale Green’s function (GF) method for static and dynamic modelling and simulation results of modern advanced nanomaterials, particularly the two-dimensional (2D) materials. This book will be of interest to researchers and industry professionals working on advanced materials.
Author: Nikolay Dishovsky
Publisher: CRC Press
ISBN: 1351659987
Category : Science
Languages : en
Pages : 457
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Book Description
Elastomer-Based Composite Materials: Mechanical, Dynamic, and Microwave Properties and Engineering Applications is focused on elastomer-based composite materials comprising different types of reinforcing fillers. The book provides an informative examination of the possibilities for broadening the engineering applications of elastomer composites through using various types of hybrid fillers, ferrites, and ceramics, and also examines their synthesis and characterization. It discusses new hybrid fillers that have been synthesized by different techniques, e.g. impregnation of different substrates (carbon black, conductive carbon black, activated carbons, etc.) with silica or magnetite. These new fillers have been thoroughly characterized by standard techniques and by up-to-date methods, such as energy dispersive X-ray spectroscopy in scanning transmission electron microscopy (STEM-EDX), atomic absorption spectroscopy (AAS), and inductively coupled plasma–optical emission spectroscopy (ICP-OES). The effect of those fillers upon the curing properties, mechanical and dynamic parameters, electrical conductivity, and dielectric and microwave characteristics of elastomer-based composites is discussed in detail in this volume. The book also covers the influence of various types of ceramics (SiC, B4C, and TiB2) and barium and strontium hexaferrites upon the aforementioned properties of rubber composites in conjunction with a view toward solutions for environmental problems caused by waste tires. The book shows that pyrolysis-cum-water vapor is a suitable and environmentally friendly method for the conversion of the waste green tires into useful carbon-silica hybrid fillers. The properties of elastomer-based composites comprising different types of nanostructures (fullerenes, carbon nanotubes, graphene nanoplatelets), modified activated carbons, and calcined kaolin are also discussed. Special attention is paid to composites with lower levels of zinc oxide. The volume provides an abundance of knowledge on the detailed characterization of these fillers and on the curing, mechanical, dynamic mechanical, and dielectric and microwave properties of the elastomeric composites. The book surveys the most recent research activities of the authors, which will make it a vital reference source for scientists in both the academic and industrial sectors, as well as for individuals who are interested in rubber materials. It will be very useful for students, especially PhD students, scientists, lecturers, and engineers working or doing research in the field of polymer materials science, elastomer-based composites and nanocomposites and their engineering applications in the production of microwave absorbers and electromagnetic waves shielding materials, materials for electronics devices and telecommunications.
Author: Madhuri Sharon
Publisher: John Wiley & Sons
ISBN: 1119769132
Category : Technology & Engineering
Languages : en
Pages : 448
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Book Description
This book covers the fundamentals and applications of Carbon Nanofiber (CNF). In the first section, the initial chapter on the fundamentals of CNF is by Professor Maheshwar Sharon, the recognized “Father of Carbon Nanotechnology in India”, which powerfully provides a succinct overview of CNFs. This is followed by a chapter on biogenics that have produced unique morphologies of CNF that makes them suitable to various applications. This is followed by a chapter that mainly focuses on nanocomposites, especially those involving nanocomposites of CNF. The role of nanocatalysts and composites in promoting and enhancing the synthesis and application of CNF is then covered, followed by an important chapter on the characterization of CNF. The second section of the book encompasses the various applications of CNF, such as its use as a possible superconductor to adsorb and store hydrogen, and as a microwave absorber. The application of CNF for environmental concerns is also detailed by assessing its usefulness in dye and heavy metal removal from polluted water. The applications that are addressed include lithium-ion battery, solar cell, antenna, cosmetics, usefulness in regenerative medicine, as well as various aspects of agrotechnology.
Author: Bahman Zohuri
Publisher: Springer Nature
ISBN: 3030406199
Category : Technology & Engineering
Languages : en
Pages : 428
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Book Description
This book provides a solid foundation for understanding radar energy warfare and stealth technology. The book covers the fundamentals of radar before moving on to more advanced topics, including electronic counter and electronic counter-counter measures, radar absorbing materials, radar cross section, and the science of stealth technology. A final section provides an introduction to Luneberg lens reflectors. The book will provide scientists, engineers, and students with valuable guidance on the fundamentals needed to understand state-of-the-art radar energy warfare and stealth technology research and applications.
Author: Hema Singh
Publisher: Springer
ISBN: 9812877606
Category : Technology & Engineering
Languages : en
Pages : 67
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Book Description
This book presents a comprehensive review of plasma-based stealth, covering the basics, methods, parametric analysis, and challenges towards the realization of the idea. The concealment of aircraft from radar sources, or stealth, is achieved through shaping, radar absorbing coatings, engineered materials, or plasma, etc. Plasma-based stealth is a radar cross section (RCS) reduction technique associated with the reflection and absorption of incident electromagnetic (EM) waves by the plasma layer surrounding the structure. A plasma cloud covering the aircraft may give rise to other signatures such as thermal, acoustic, infrared, or visual. Thus it is a matter of concern that the RCS reduction by plasma enhances its detectability due to other signatures. This needs a careful approach towards the plasma generation and its EM wave interaction. The book starts with the basics of EM wave interactions with plasma, briefly discuss the methods used to analyze the propagation characteristics of plasma, and its generation. It presents the parametric analysis of propagation behaviour of plasma, and the challenges in the implementation of plasma-based stealth technology. This review serves as a starting point for the graduate and research students, scientists and engineers working in the area of low-observables and stealth technology.
