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This book discusses the development of promising technologies for compact antennas for high data-rate communications. It discusses and analyzes the design of compact ultra-wideband (UWB) and multiple input, multiple output (MIMO) antennas, providing essential know-how for designers, practicing engineers and scientists. These wireless communication technologies enable consumers to have convenient access to a wide range of services – anytime, anywhere. And the introduction of wireless mobile access points eliminates the limitations to communication imposed by geographical location. The Internet has allowed people to access and share information much more rapidly, but in order to achieve higher data rates with the limited available resources and imposed constraints, wireless communication technology needs to be pushed beyond the physical limits of the propagation channel. This book contributes to achieving this goal.

Radio --- MIMO systems. --- Ultra-wideband communication systems. --- Antennas. --- Ultrawideband communication systems --- Ultra-wideband systems --- UWB communication systems --- Multiple input-multiple output systems --- Antennas, Radio --- Radio antennas --- Aerials --- Engineering. --- Electronic circuits. --- Microwaves. --- Optical engineering. --- Electrical engineering. --- Microwaves, RF and Optical Engineering. --- Communications Engineering, Networks. --- Electronic Circuits and Devices. --- Wireless communication systems --- Antennas (Electronics) --- Broadband communication systems --- Receivers and reception --- Transmitters and transmission --- Telecommunication. --- Electric communication --- Mass communication --- Telecom --- Telecommunication industry --- Telecommunications --- Communication --- Information theory --- Telecommuting --- Hertzian waves --- Electric waves --- Electromagnetic waves --- Geomagnetic micropulsations --- Radio waves --- Shortwave radio --- Electron-tube circuits --- Electric circuits --- Electron tubes --- Electronics --- Electric engineering --- Engineering --- Mechanical engineering

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The growing commercial market of Microwave/ Millimeter wave industry over the past decade has led to the explosion of interests and opportunities for the design and development of microwave components.The design of most microwave components requires the use of commercially available electromagnetic (EM) simulation tools for their analysis. In the design process, the simulations are carried out by varying the design parameters until the desired response is obtained. The optimization of design parameters by manual searching is a cumbersome and time consuming process. Soft computing methods such as Genetic Algorithm (GA), Artificial Neural Network (ANN) and Fuzzy Logic (FL) have been widely used by EM researchers for microwave design since last decade. The aim of these methods is to tolerate imprecision, uncertainty, and approximation to achieve robust and low cost solution in a small time frame.  Modeling and optimization are essential parts and powerful tools for the microwave/millimeter wave design. This book deals with the development and use of soft computing methods for tackling challenging design problems in the microwave/millimeter wave domain. The aim in the development of these methods is to obtain the design in small time frame while improving the accuracy of the design for a wide range of applications. To achieve this goal, a few diverse design problems of microwave field, representing varied challenges in the design, such as different microstrip antennas, microwave filters, a microstrip-via and also some critical high power components such as nonlinear tapers and RF-windows are considered as case-study design problems. Different design methodologies are developed for these applications. The presents soft computing methods, their review for microwave/millimeter wave design problems and specific case-study problems to infuse better insight and understanding of the subject.

Microwave devices --- Millimeter wave devices --- Soft computing --- Electrical & Computer Engineering --- Engineering & Applied Sciences --- Electrical Engineering --- Computer Science --- Design --- Industrial applications --- Design. --- Industrial applications. --- Engineering. --- Computer programming. --- Physics. --- Applied mathematics. --- Engineering mathematics. --- Computational intelligence. --- Microwaves. --- Optical engineering. --- Computational Intelligence. --- Appl.Mathematics/Computational Methods of Engineering. --- Microwaves, RF and Optical Engineering. --- Numerical and Computational Physics. --- Programming Techniques. --- Applied and Technical Physics. --- Mechanical engineering --- Hertzian waves --- Electric waves --- Electromagnetic waves --- Geomagnetic micropulsations --- Radio waves --- Shortwave radio --- Intelligence, Computational --- Artificial intelligence --- Engineering --- Engineering analysis --- Mathematical analysis --- Natural philosophy --- Philosophy, Natural --- Physical sciences --- Dynamics --- Computers --- Electronic computer programming --- Electronic data processing --- Electronic digital computers --- Programming (Electronic computers) --- Coding theory --- Construction --- Industrial arts --- Technology --- Mathematics --- Programming --- Cognitive computing --- Computational intelligence --- Electronic apparatus and appliances --- Millimeter waves --- Microwaves --- Computer science. --- Mathematical and Computational Engineering. --- Numerical and Computational Physics, Simulation. --- Informatics --- Science

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This book deals with the design and analysis of fractal apertures in waveguides, conducting screens and cavities using numerical electromagnetics and field-solvers. The aim is to obtain design solutions with improved accuracy for a wide range of applications. To achieve this goal, a few diverse problems are considered. The book is organized with adequate space dedicated for the design and analysis of fractal apertures in waveguides, conducting screens, and cavities, microwave/millimeter wave applications followed by detailed case-study problems to infuse better insight and understanding of the subject. Finally, summaries and suggestions are given for future work. Fractal geometries were widely used in electromagnetics, specifically for antennas and frequency selective surfaces (FSS). The self-similarity of fractal geometry gives rise to a multiband response, whereas the  space-filling nature of the fractal geometries makes it an efficient element in antenna and FSS unit cell miniaturization. Until now, no efforts were made to study the behavior of these fractal geometries for aperture coupling problems. The aperture coupling problem is an important boundary value problem in electromagnetics and used in waveguide filters and power dividers, slotted ground planes, frequency selective surfaces and metamaterials. The present book is intended to initiate a study of the characteristics of fractal apertures in waveguides, conducting screens and cavities. To perform a unified analysis of these entirely dissimilar problems, the “generalized network formulation of the aperture problems” by Mautz and Harrington was extended to multiple-aperture geometry. The authors consider the problem of coupling between two arbitrary regions coupled together via multiple apertures of arbitrary shape. MATLAB codes were developed for the problems and validated with the results available in the literature as well as through simulations on ANSOFT's HFSS.

Physics --- Fluid mechanics --- Optics. Quantum optics --- Electromagnetism. Ferromagnetism --- Spectrometric and optical chemical analysis --- Matlab (informatica) --- elektrodynamica --- telecommunicatie --- fysica --- spectrometrie --- optica