Development Of Ultra Low Loss Ceramic Dielectrics
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Development Of Ultra Low Loss Ceramic Dielectrics
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Author : Milagros B. Smyth
language : en
Publisher:
Release Date : 1961
Development Of Ultra Low Loss Ceramic Dielectrics written by Milagros B. Smyth and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Dielectrics categories.
Ceramic Dielectrics And Capacitors
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Author : J.M. Herbert
language : en
Publisher: CRC Press
Release Date : 1985-01-01
Ceramic Dielectrics And Capacitors written by J.M. Herbert and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985-01-01 with Science categories.
Detailed study of the composition, physical properties, and manufacturing methods of ceramic dielectrics and capacitors in light of recent commercial developments and influences. Covers the essential theory and applications for electrical engineers wanting informed insight into the characteristics, advantages, and limitations of this class of capacitors, and for ceramicists seeking to improve their electrical expertise.
Dielectric Materials For Wireless Communication
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Author : Mailadil T. Sebastian
language : en
Publisher: Elsevier
Release Date : 2010-07-07
Dielectric Materials For Wireless Communication written by Mailadil T. Sebastian and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-07-07 with Technology & Engineering categories.
Microwave dielectric materials play a key role in our global society with a wide range of applications, from terrestrial and satellite communication including software radio, GPS, and DBS TV to environmental monitoring via satellite. A small ceramic component made from a dielectric material is fundamental to the operation of filters and oscillators in several microwave systems. In microwave communications, dielectric resonator filters are used to discriminate between wanted and unwanted signal frequencies in the transmitted and received signal. When the wanted frequency is extracted and detected, it is necessary to maintain a strong signal. For clarity it is also critical that the wanted signal frequencies are not affected by seasonal temperature changes. In order to meet the specifications of current and future systems, improved or new microwave components based on dedicated dielectric materials and new designs are required. The recent progress in microwave telecommunication, satellite broadcasting and intelligent transport systems (ITS) has resulted in an increased demand for Dielectric Resonators (DRs). With the recent revolution in mobile phone and satellite communication systems using microwaves as the propagation media, the research and development in the field of device miniaturization has been a major challenge in contemporary Materials Science. In a mobile phone communication, the message is sent from a phone to the nearest base station, and then on via a series of base stations to the other phone. At the heart of each base station is the combiner/filter unit which has the job of receiving the messages, keeping them separate, amplifying the signals and sending then onto the next base station. For such a microwave circuit to work, part of it needs to resonate at the specific working frequency. The frequency determining component (resonator) used in such a high frequency device must satisfy certain criteria. The three important characteristics required for a dielectric resonator are (a) a high dielectric constant which facilitates miniaturization (b) a high quality factor (Qxf) which improves the signal-to-noise ratio, (c) a low temperature coefficient of the resonant frequency which determines the stability of the transmitted frequency. During the past 25 years scientists the world over have developed a large number of new materials (about 3000) or improved the properties of known materials. About 5000 papers have been published and more than 1000 patents filed in the area of dielectric resonators and related technologies. This book brings the data and science of these several useful materials together, which will be of immense benefit to researchers and engineers the world over. The topics covered in the book includes factors affecting the dielectric properties, measurement of dielectric properties, important low loss dielectric material systems such as perovskites, tungsten bronze type materials, materials in BaO-TiO2 system, (Zr,Sn)TiO4, alumina, rutile, AnBn-1O3n type materials, LTCC, ceramic-polymer composites etc. The book also has a data table listing all reported low loss dielectric materials with properties and references arranged in the order of increasing dielectric constant. Collects together in one source data on all new materials used in wireless communication Includes tabulated properties of all reported low loss dielectric materials In-depth treatment of dielectric resonator materials
Handbook Of Low And High Dielectric Constant Materials And Their Applications Two Volume Set
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Author : Hari Singh Nalwa
language : en
Publisher: Elsevier
Release Date : 1999-09-07
Handbook Of Low And High Dielectric Constant Materials And Their Applications Two Volume Set written by Hari Singh Nalwa and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-09-07 with Science categories.
Recent developments in microelectronics technologies have created a great demand for interlayer dielectric materials with a very low dielectric constant. They will play a crucial role in the future generation of IC devices (VLSI/UISI and high speed IC packaging). Considerable efforts have been made to develop new low as well as high dielectric constant materials for applications in electronics industries. Besides achieving either low or high dielectric constants, other materials' properties such as good processability, high mechanical strength, high thermal and environmental stability, low thermal expansion, low current leakage, low moisture absorption, corrosion resistant, etc., are of equal importance. Many chemical and physical strategies have been employed to get desired dielectric materials with high performance. This is a rapidly growing field of science--both in novel materials and their applications to future packing technologies. The experimental data on inorganic and organic materials having low or high dielectric constant remail scattered in the literature. It is timely, therfore, to consolidate the current knowledge on low and high dielectric constant materials into a sigle reference source. Handbook of Low and High Dielectric Constant Materials and Their Applications is aimed at bringing together under a sigle cover (in two volumes) all low and high dielectric constant materials currently studied in academic and industrial research covering all spects of inorgani an organic materials from their synthetic chemistry, processing techniques, physics, structure-property relationship to applications in IC devices. This book will summarize the current status of the field covering important scientific developments made over the past decade with contributions from internationally recognized experts from all over the world. Fully cross-referenced, this book has clear, precise, and wide appeal as an essential reference source for all those interested in low and high dielectric constant material.
High Energy Density And Low Loss Polymer Dielectrics For Energy Storage Capacitors And Organic Electronics
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Author : Shan Wu
language : en
Publisher:
Release Date : 2014
High Energy Density And Low Loss Polymer Dielectrics For Energy Storage Capacitors And Organic Electronics written by Shan Wu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Electrical energy storage devices are among the most important components for a broad range of applications in modern electronics and electrical power systems such as hybrid electric vehicles (HEV), medical defibrillators, filters, and switched-mode power supplies. Due to these applications, electrical energy storage devices have been growing rapidly in recent years. Desired properties of the dielectrics for energy storage include high electric energy density, high charge-discharge efficiency, high electric breakdown, and high operation temperature. Compared with ceramic capacitors, polymer thin film capacitors are inexpensive, possess high dielectric strength, high energy density and low dielectric loss, and fail gracefully. The continuous miniaturization and increased functionality in modern electronics and electric power systems demand further increases in energy and power density of dielectric materials since these capacitors contribute significant (>30%) volume and weight to systems. One major challenge in developing dielectric polymers is realizing high energy density while maintaining low dielectric loss, even when high electric fields are applied. The traditional dielectric polymers have a relatively low dielectric constant around 2-3, and the energy density is limited to below 5 J/cm3. Recently, PVDF (polyvinylidene fluoride) based dielectric polymers such as P(VDF-CTFE) (CTFE: chlorotrifluoroethylene) and P(VDF-HFP) (HFP: hexafluoropropylene) have been studied and demonstrated to achieve very high energy densities (>25 J/cm3). Unfortunately, it is still a challenge to reduce the ferroelectric loss in PVDF based polymers by the strongly coupled dipoles and the high electric field conduction loss. Two approaches are introduced in this dissertation on how to develop the next generation polymer dielectrics with high energy density, low loss, high breakdown strength, and high temperature stability. The first approach is modification of high K polymer dielectrics to reduce the ferroelectric loss and conduction loss. The second approach is start from intrinsically low loss materials, then enhance the dielectric properties by increasing the dipole moment and dipole density.A polar-fluoropolymer blend consisting of a high energy density P(VDF-CTFE) and a low dielectric loss poly(ethylene-chlorotrifluoroethylene) (ECTFE) was developed. Both the blend and crosslinked blend films exhibit a dielectric constant of 7 and low loss (1%), as expected from the classical composite theory. Moreover, introducing crosslinking can lead to a marked reduction of losses in blend films at high electric fields while maintaining a high energy density. At 250 MV/m, a loss of 3% can be achieved in the crosslinked blend compared with 7% loss in pure blend, which is already much below that of pure P(VDF-CTFE) (35%). Furthermore, uniaxially stretch can improve the dielectric breakdown strength and mechanical properties.The promise of aromatic, amorphous, and polar polymers containing high dipolar moments with very low defect levels is demonstrated for future dielectric materials with ultrahigh electric-energy density, low loss at high applied fields, and ultrahigh breakdown strengths. Specifically, an amorphous, polar, and glass-phase dielectric polymer aromatic polythiourea (ArPTU) features extremely high dielectric breakdown strength (>1.1 GV/m), low loss at high electric fields (10% at 1.1 GV/m), and a high maximum electrical energy density (>24 J/cm3). This dissertation presents a study of the structure-property relationships and electrical properties study in ArPTU, and offers a phenomenological explanation for the experimentally observed high-field loss characteristics which facilitate the excellent energy storage properties.Besides the aromatic polythiourea, meta-aromatic polyurea (meta-PU) was developed and investigated for energy storage capacitors. Modifications to the molecular structure can tune the dipolar density and dipole moment in the polyurea systems to improve the dielectric properties. The meta-PU has an enhanced dielectric constant from the higher volume dipolar density, higher energy density, and a high electrical breakdown. A high storage electrical energy density of 13 J/cm3 with energy storage efficiency of 91% can be achieved at 670 MV/m electric field. Other polyureas, polythioureas based dielectrics with tunable dielectric properties are also summarized.Polymer dielectrics possessing high dielectric constant, low loss are not only of great importance for energy storage capacitors, but also attractive as gate dielectrics in organic thin film field effect transistors (OTFTs). In this work, solution processable PVDF based polymers, with tunable dielectric constant from 7 to more than 50 as well as ferroelectricity, were used as the gate insulator in bottom gated OTFTs with a pentacene semiconductor layer. Due to the high dielectric constant of P(VDF-TrFE-CFE), a large capacitive coupling between the gate and channel can be achieved which causes a high charge concentration at the interface of the semiconductor and dielectric layers. In devices with the P(VDF-TrFE-CFE) dielectric layer, high performances and a low minimum operation gate voltage (5-10 V) were attained. Also, the ferroelectric thin film transistor with the P(VDF-TrFE) dielectric has a high remnant polarization, which is desired for memory applications.
Microwave Materials And Applications
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Author : Mailadil T. Sebastian
language : de
Publisher: John Wiley & Sons
Release Date : 2017-03-02
Microwave Materials And Applications written by Mailadil T. Sebastian and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-03-02 with Technology & Engineering categories.
Die jüngsten Fortschritte im Bereich der drahtlosen Telekommunikation und dem Internet der Dinge sorgen bei drahtlosen Systemen, beim Satellitenfernsehen und bei intelligenten Transportsystemen der 5. Generation für eine höhere Nachfrage nach dielektrischen Materialien und modernen Fertigungstechniken. Diese Materialien bieten ausgezeichnete elektrische, dielektrische und thermische Eigenschaften und verfügen über enormes Potenzial, vor allem bei der drahtlosen Kommunikation, bei flexibler Elektronik und gedruckter Elektronik. Microwave Materials and Applications erläutert die herkömmlichen Methoden zur Messung der dielektrischen Eigenschaften im Mikrowellenbereich, die verschiedenen Ansätze zur Lösung von Problemen der Materialchemie und von Kristallstrukturen, in den Bereichen Doping, Substitution und Aufbau von Verbundwerkstoffen. Besonderer Schwerpunkt liegt auf Verarbeitungstechniken, Einflüssen der Morphologie und der Anwendung von Materialien in der Mikrowellentechnik. Gleichzeitig werden viele der jüngsten Forschungserkenntnisse bei Mikrowellen-Dielektrika und -Anwendungen zusammengefasst. Die verschiedenen Kapitel untersuchen: Oxidkeramiken für dielektrische Resonatoren und Substrate, HTCC-, LTCC- und ULTCC-Bänder für Substrate, Polymer-Keramik-Verbundstoffe für Leiterplatten, Elastomer-Keramik-Verbundstoffe für flexible Elektronik, dielektrische Tinten, Materialien für die EMV-Abschirmung, Mikrowellen-Ferrite. Ein umfassender Anhang präsentiert die grundlegenden Eigenschaften von mehr als 4000 verlustarmen dielektrischen Keramiken, deren Zusammensetzung, kristalline Struktur und dielektrischen Eigenschaften für Mikrowellenanwendungen. Microwave Materials and Applications wirft einen Blick auf sämtliche Aspekte von Mikrowellenmaterialien und -anwendungen, ein nützliches Handbuch für Wissenschaftler, Unternehmen, Ingenieure und Studenten, die sich mit heutigen und neuen Anwendungen in den Bereichen drahtlose Kommunikation und Unterhaltungselektronik beschäftigen.
Dielectric Ceramics
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Author : K. M. Nair
language : en
Publisher:
Release Date : 1993
Dielectric Ceramics written by K. M. Nair and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Technology & Engineering categories.
Developments In Dielectric Materials And Electronic Devices
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Author : K. M. Nair
language : en
Publisher: John Wiley & Sons
Release Date : 2012-04-11
Developments In Dielectric Materials And Electronic Devices written by K. M. Nair and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-04-11 with Technology & Engineering categories.
Papers in this volume include topics such as materials synthesis and processing; relaxors; novel compositions; material design; materials for multilayer electronic devices; processing-microstructure-property relationship; applications; environmental issues; and economic/cost analysis of tomorrow's electronic devices. Includes 38 papers.
Electronic Properties Of Materials
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Author : H. Thayne Johnson
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-27
Electronic Properties Of Materials written by H. Thayne Johnson and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-27 with Technology & Engineering categories.
HIS FIRST EDITION OF Electronic Properties of Force Materials Laboratory, where Air Force respon T Materials: A Guide to the Literature initiates a sibility for these contracts has resided. Mr. John W. plan for making available the indexing work of the Atwood is Project Manager at Hughes Aircraft Electronic Properties Information Center. Since the Company. inception of EPIC in June, 1961, a basic objective has Professional members of EPIC are Charles L. M. been to use techniques and procedures that would Blocher, Donald L. Grigsby, Dana H. Johnson, allow maximum distribution and use of EPIC output. Thomas J. Lyndon, John T. Milek, Meta S. Neu Accordingly, data processing and reproduction tech berger, and Emil Schafer. All have ably contributed niques were established to reproduce and distribute to this work. Mr. Johnson and Mrs. Neuberger have easily and economically a few copies of what was been primarily responsible for the indexing effort; then a card index. Mr. Lyndon has supervised the classical library pro As the program advanced, it became apparent that cedures and the clerical effort; Mr. Blocher and Mr. a few copies of the index were not enough. The index Grigsby have controlled the indexing vocabulary, the should be available to all, instead of just a select few. cross-references, and the data processing input; and However, this would have meant so many copies that Mr. Schafer has prepared the very excellent glossary, the cost would have drained funds from the program with the assistance of Mr. Milek.
Nistir
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Author :
language : en
Publisher:
Release Date : 2001
Nistir written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.