Materials Issues for Tunable RF and Microwave Devices III: Volume 720


Book Description

Challenges facing the implementation of an affordable tunable RF and microwave device technology are discussed in these papers from an April 2002 meeting. Materials issues and devices are examined, with information on new tunable materials, issues of preparation and optimization of bulk and think film properties, material and surface characterization, evaluation of material loss and loss mechanisms, and effects of microstructure. At the device level, phase shifters are discussed and a new device concept for variable true time delay versus phase shift is introduced. At the system level, a paraelectric lens is used to demonstrate electronic beam steering of an antenna. Tidrow is affiliated with the US Army Research Laboratory. Annotation copyrighted by Book News, Inc., Portland, OR




Index of Conference Proceedings


Book Description




Materials and Devices for Optoelectronics and Microphotonics


Book Description

This volume combines the proceedings of Symposium K, Materials and Devices for Optoelectronics and Photonics, and Symposium L, Photonic Crystals--From Materials to Devices, both from the 2002 MRS Spring Meeting in San Francisco. The two symposia served as a unique meeting place where a community of materials scientists and device-oriented engineers could present their latest results. Papers from Symposium K concentrate on materials for solid-state lighting, with particular emphasis on nitrides and other high-bandgap semiconductors and quantum dots, as well as materials for optical waveguides and interconnects. Presentations from Symposium L discuss theoretical methods and materials and fabrication techniques for 2D and 3D photonic crystals, with special emphasis on tunability of photonic crystals.




Molecularly Imprinted Materials--sensors and Other Devices


Book Description

This volume contains the proceedings of two symposia held at the 2002 MRS Spring Meeting in San Francisco. Molecular imprinting (MI) technology has attracted much attention and enjoyed tremendous development over the past decade. MI technology enables the preparation of materials with host sites that recognize specific guest molecules, analogous to the "lock-and-key" paradigm of antibodies and enzymes. Advantages of molecularly imprinted materials include: a degree of specificity approaching that of antibodies but with much greater temporal and thermal stability; rapid development because precise molecular design and chemical synthesis are unnecessary; and wide applicability because materials may be imprinted with almost any shape-persistent analyte of interest. Papers from Symposium M, "Molecularly Imprinted Materials, focus primarily on the fabrication of functional materials and devices based on MI materials. Studies are presented not only by experts in MI, but more importantly, by materials scientists integrating molecular imprinting with cutting-edge techniques in microfabrication and nanotechnology.




Perovskite Materials


Book Description

Perovskites form a large class of materials, deceptively simple in basic structure but immensely complex in compositional variations, symmetry changes, and physical properties. They include ferroelectrics, magnetoresistive materials, oxide ion and proton conductors, superconductors, and an abundant phase in the Earth's lower mantle. This volume brings together researchers operating in diverse areas with the common goal of understanding perovskite's intrinsic and extrinsic properties and their potential use. A recurring theme is the interplay of theory and experiment in understanding and predicting properties. Sessions on theory and modeling are featured, emphasizing phase changes and elasticity of Earth materials such as MgSiO3, and CaSiO3, and underscoring new magnetic and ferroelectric materials, including thin films and multilayers. These are complemented by experimental studies of the synthesis of new families of perovskites and property measurements. The volume shows the diversity of materials, measurements, and ideas being studied at present.




Biological and Biomimetic Materials--properties to Function


Book Description

Materials scientists, chemists, biologists, physicists, bioengineers and clinicians join together in this volume to focus on the formation, function and structural characterization of biologically formed organic and inorganic materials. Recent developments in bioinspired materials synthesis are also featured. In all of these areas, understanding the structures and kinetics of the interfaces between crystals and other ordered or disordered molecular assemblies requires consideration of multiple chemical species, intermolecular interactions, self assembly, molecular anisotropy, and the structure of the interface between fluid and solid phases. Of particular interest are new materials engineered to replace or restore tissue functions. Topics include: materials in natural biological tissues; imaging and characterization techniques; organic biomaterials--proteins and peptides; interface engineering, patterning and biocompatibility; composite biomaterials--bones and teeth; biomaterials; tissue engineering; biomimetics, sensors and nanotechnology; and materials for drug and gene delivery.







Converging Technologies for Improving Human Performance


Book Description

M. C. Roco and W.S. Bainbridge In the early decades of the 21st century, concentrated efforts can unify science based on the unity of nature, thereby advancing the combination of nanotechnology, biotechnology, information technology, and new technologies based in cognitive science. With proper attention to ethical issues and societal needs, converging in human abilities, societal technologies could achieve a tremendous improvement outcomes, the nation's productivity, and the quality of life. This is a broad, cross cutting, emerging and timely opportunity of interest to individuals, society and humanity in the long term. The phrase "convergent technologies" refers to the synergistic combination of four major "NBIC" (nano-bio-info-cogno) provinces of science and technology, each of which is currently progressing at a rapid rate: (a) nanoscience and nanotechnology; (b) biotechnology and biomedicine, including genetic engineering; (c) information technology, including advanced computing and communications; (d) cognitive science, including cognitive neuroscience. Timely and Broad Opportunity. Convergence of diverse technologies is based on material unity at the nanoscale and on technology integration from that scale.




Microwave and Wireless Synthesizers


Book Description

The new edition of the leading resource on designing digital frequency synthesizers from microwave and wireless applications, fully updated to reflect the most modern integrated circuits and semiconductors Microwave and Wireless Synthesizers: Theory and Design, Second Edition, remains the standard text on the subject by providing complete and up-to-date coverage of both practical and theoretical aspects of modern frequency synthesizers and their components. Featuring contributions from leading experts in the field, this classic volume describes loop fundamentals, noise and spurious responses, special loops, loop components, multiloop synthesizers, and more. Practical synthesizer examples illustrate the design of a high-performance hybrid synthesizer and performance measurement techniques—offering readers clear instruction on the various design steps and design rules. The second edition includes extensively revised content throughout, including a modern approach to dealing with the noise and spurious response of loops and updated material on digital signal processing and architectures. Reflecting today's technology, new practical and validated examples cover a combination of analog and digital synthesizers and hybrid systems. Enhanced and expanded chapters discuss implementations of direct digital synthesis (DDS) architectures, the voltage-controlled oscillator (VCO), crystal and other high-Q based oscillators, arbitrary waveform generation, vector signal generation, and other current tools and techniques. Now requiring no additional literature to be useful, this comprehensive, one-stop resource: Provides a fully reviewed, updated, and enhanced presentation of microwave and wireless synthesizers Presents a clear mathematical method for designing oscillators for best noise performance at both RF and microwave frequencies Contains new illustrations, figures, diagrams, and examples Includes extensive appendices to aid in calculating phase noise in free-running oscillators, designing VHF and UHF oscillators with CAD software, using state-of-the-art synthesizer chips, and generating millimeter wave frequencies using the delay line principle Containing numerous designs of proven circuits and more than 500 relevant citations from scientific journal and papers, Microwave and Wireless Synthesizers: Theory and Design, Second Edition, is a must-have reference for engineers working in the field of radio communication, and the perfect textbook for advanced electrical engineering students.




WDM Technologies: Passive Optical Components


Book Description

The communications industry is at the onset of new expansion of WDM technology necessary to meet the new demand for bandwidth. This is the second of a four reference books that will cover this technology comprehensively with all of the major topics covered by a separate volumes - i.e. active components, passive components, systems and networks. This book is the first which covers all key passive optical components required for current and next generation optical communication systems. World-renowned authors, who are pioneers in their research area, have written the chapters in their area of expertise. The book highlights not only the principle of operation and characteristics of the passive optical components, but also provides an in-depth account of the state-of-the-art system applications.- Helps the reader to choose the right device for a given system application.- Provides the reader with insight and understanding for key passive optical components frequently being / to be used in the optical communication systems, essential building blocks of today's/next generation fiber optic networks.- Allows engineers working in different optical communication areas(i.e. from system to component), to understand the principle and mechanics of each key component they deal with for optical system design.- Covers Planar lightwave circuit (PLC) based router, different optical switches technologies (based on MEMS, thermo-optic, and electro-optic) and different optical amplifier technologies (based on semiconductor optical amplifier, EDFA ,and raman amplifier). - Highlights the operating principle of each component, system applications, and also future opportunities.