Journal ArticleDOI
Functional advances of microwave dielectrics for next generation
Hitoshi Ohsato,Hitoshi Ohsato +1 more
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TLDR
In this article, the microwave dielectrics have been used for energy and natural resources conservation, waste disposal techniques, and reduction of global warming gases, and new frontiers of microwave Dielectrics are presented in relation with these energy issues.About:
This article is published in Ceramics International.The article was published on 2012-01-01. It has received 76 citations till now. The article focuses on the topics: Waste disposal & Microwave.read more
Citations
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Journal ArticleDOI
Correlations between crystal structure and dielectric properties of high-Q materials in rock-salt structure Li2O–MgO–BO2 (B = Ti, Sn, Zr) systems at microwave frequency
Haitao Wu,Eung Soo Kim +1 more
TL;DR: A series of ultra-low loss microwave dielectric materials Li2O-MgO-BO2 (B = Ti, Sn, Zr) were prepared by the conventional solid-state method.
Journal ArticleDOI
A3Y2Ge3O12 (A = Ca, Mg): Two novel microwave dielectric ceramics with contrasting τf and Q × f
Ying Tang,Zhiwei Zhang,Jie Li,Mingyu Xu,Yifan Zhai,Lian Duan,Congxue Su,Laijun Liu,Yihua Sun,Liang Fang,Liang Fang +10 more
TL;DR: In this article, two garnet-structured microwave dielectric ceramics of A3Y2Ge3O12 (A = Ca, Mg; called CYG and MYG, respectively) were synthesized.
Journal ArticleDOI
Correlations of crystal structure, bond energy and microwave dielectric properties of AZrNb2O8 (A = Zn, Co, Mg, Mn) ceramics
TL;DR: In this paper, the authors investigated the correlations between the crystalline structure and microwave dielectric properties for AZrNb 2 O 8 (A = Zn, Co, Mg, Mn) ceramics based on the complex bond theory.
Journal ArticleDOI
Characterization of low loss microwave dielectric materials Li3Mg2NbO6 based on the chemical bond theory
Haitao Wu,Eung Soo Kim +1 more
TL;DR: In this article, the chemical bond theory was used to calculate the lattice energy, ionicity energy and the coefficient of thermal expansion for the characterization of correlations between properties and structures of Li 3 Mg 2 NbO 6 ceramics.
Journal ArticleDOI
Li4Mg3Ti2O9: A novel low-loss microwave dielectric ceramic for LTCC applications
J.X. Bi,Yunjuan Niu,Haitao Wu +2 more
TL;DR: Li4Mg3Ti2O9 dielectric ceramics with rock-salt structure were prepared by a conventional solid-state route in this paper, where the intrinsic factors like bond ionicity and lattice energy played a dominant role when the cerams were densified at 1450°C.
References
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Journal ArticleDOI
Wireless Power Transfer via Strongly Coupled Magnetic Resonances
Andre B. Kurs,Aristeidis Karalis,Robert Moffatt,John D. Joannopoulos,Peter H. Fisher,Marin Soljacic +5 more
TL;DR: A quantitative model is presented describing the power transfer of self-resonant coils in a strongly coupled regime, which matches the experimental results to within 5%.
Book
Dielectric Materials for Wireless Communication
Abstract: 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.Key Features:- 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
Journal ArticleDOI
Nonradiative Dielectric Waveguide for Millimeter-Wave Integrated Circuits
T. Yoneyama,S. Nishida +1 more
TL;DR: In this article, a nonradiative dielectric waveguide is proposed in which dielectic strips are sandwiched between two parallel metal plates separated by a distance smaller than half a wavelength.
Journal ArticleDOI
Complex permittivity of some ultralow loss dielectric crystals at cryogenic temperatures
TL;DR: In this article, whispering gallery modes were used for very accurate permittivity and dielectric loss measurements of ultralow loss isotropic and uniaxially anisotropic single crystals.
Journal ArticleDOI
Wireless Power Transfer Using Electromagnetic Resonant Coupling
Takehiro Imura,Yoichi Hori +1 more
Related Papers (5)
Microwave Dielectric Ceramics for Resonators and Filters in Mobile Phone Networks
Ian M. Reaney,D. Iddles +1 more
A Dielectric Resonator Method of Measuring Inductive Capacities in the Millimeter Range
B.W. Hakki,P.D. Coleman +1 more