Microwave Devices
Mostrando 1-12 de 32 artigos, teses e dissertações.
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1. Evaluation of the Influence of the Substituting Cation on the Structural and Morphological Properties of the New Garnet Sm3−xREExFe5O12 (REE = Dy, Gd and Lu)
Rare earth garnets (REE3Fe5O12) have magnetic-electric and optical properties that can be used in transmitters, microwave and data storage devices. These properties depend mainly on partial or total substitution of the cationic sites, as well as by the synthesis method used. Therefore, in this work was studied the influence of the substituting cation on the
Mat. Res.. Publicado em: 20/01/2020
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2. Microwave Assisted Ultra-Fast Method to Synthesize Carbonate-Phosphates, Na3MCO3PO4 (M = Mn, Fe, Co, Ni) - Relevant Materials Applied in Sodium-Ion Batteries
Although largely used in mobiles and electric vehicles applications, insertion batteries based on Li-ion technology are high-cost devices. These applications require high-performance energy storage systems with high-energy and high-power densities, which are better attained by Li-ion technology. However, stationary applications such as power plants and unint
J. Braz. Chem. Soc.. Publicado em: 2020-01
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3. Miniaturized Triple Wideband CPW-Fed Patch Antenna With a Defected Ground Structure for WLAN/WiMAX Applications
Abstract— A coplanar waveguide (CPW)-fed patch antenna with triple wideband is presented for simultaneously satisfying Wireless Local Area Network (WLAN) and Worldwide Interoperability for Microwave Access (WiMAX) applications. The proposed antenna mainly consists by three radiating elements: inverted L-shaped Stub1, inverted L-shaped Stub2, and a rectangl
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-09
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4. Measurement with quasi-isotropic antenna of CEM coming from multisource in a reverberation chamber and in a car
The concern about the health risks that wireless technology can provide has grown globally thanks to the growing use of the devices by the population, by the finding that the public exposure to EMFs from the devices can be enhanced by the reflection of the microwave indoors. This paper will assess the distribution of electromagnetic field in a car, in order
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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5. ObtenÃÃo das cerÃmicas dielÃtricas BiTRWO6 (TR = Y, Gd ou Nd) por radiaÃÃo de micro-ondas e sua aplicaÃÃo em dispositivos eletrÃnicos / Obtaining Of Ceramic Dielectric BiTRWO6 (Tr = Y, Gd Or Nd) By Microwave Radiation And Its Application In Electronic Devices
The mixture heat of the metal oxides may promote the formation of ceramic materials, depending on their dielectric properties and its crystalline structure may be used with electronic components for a variety of functions in electrical circuits. Heating method is directly related to the material properties. This work aims to use a commercial microwave oven m
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/08/2012
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6. Ferritas de cobre e zinco do tipo espinélio sintetizadas pelos métodos: hidrotermal assistido por micro-ondas, precursores poliméricos, reação no estado sólido e decomposição térmica / Spinel type copper and zinc ferrites synthesized by the methods: microwave assisted hydrothermal, polymeric precursor, solid state reaction and thermal decomposition.
Ferrites are well studied materials due to their wide application as: gas detector, optical, electronic and magnetic devices, catalyst and pigments. In the synthesis of materials, the properties are extremely influenced by the synthesis method. In this work, four methods were used in the synthesis of spinel ferrites with composition Zn1-xCuxFe2O4 (x = 0,0; 0
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/05/2012
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7. Estudo teórico e experimental de guias PBG na faixa de micro-ondas / Theoretical and experimental study of PBG guides in microwave frequencies
Este trabalho apresenta o estudo, o projeto e a caracterização de estruturas de cristal fotônico bidimensionais na faixa de micro-ondas para arranjos cilíndricos dielétricos em simetria triangular e quadrada, com e sem curvas, na faixa de 2 a 4 GHz. A escolha dos arranjos foi feita baseando-se no cálculo do diagrama de bandas e dos modos guiados no cri
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/07/2011
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8. An FET-based microwave active circuit with dual-band negative group delay
Recent studies proved that certain electronic active circuits are capable to exhibit simultaneously a negative group delay (NGD) and amplification in microwave frequency bands. One of the simplest topologies generating this counterintuitive NGD function effect is formed by a series RLC-network in cascade with a transistor. By using this cell, similar to the
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2011-12
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9. Statistical modeling of manufacturing uncertainties for microstrip filters
This work presents a technique to characterize the errors that occur in the process of manufacturing into electromagnetic simulations of microwave devices. The procedure combines the unscented transform (UT) with simulations. The use of the UT allows efficient use of computational resources for the characterization of the random variables modeling the uncert
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2011-06
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10. Síntese assistida por microondas de LiMn2O4, caracterização e testes como catodo para dispositivos de armazenamento de energia / Microwave-assisted sinthesys of LiMn2O4, characterization and testing as cathode for energy storage devices
Lithium manganese oxide - LiMn2O4 - was produced by a microwaveassited solid state reaction. Solid mixtures containing LiOH.H2O and -MnO2 (synthesized electrolytically) underwent microwave irradiation for 3, 4 and 5 min. The obtained material was characterized by X-ray diffraction (XRD), scanning electron microscopy and cyclic voltammetry. Conductivi
Publicado em: 2011
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11. Micromachined microwave planar spiral inductors and transformers
A new micromachined planar spiral inductor, with the strips suspended individually, has been fabricated in standard GaAs high electron-mobility transistor monolithic-microwave integrated-circuit technology through maskless front-side bulk micromachining. The electronic compatibility, the use of industrial integrated-circuit production lines, the straightforw
Publicado em: 2011
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12. MICROWAVE DEVICES USING HIGH DIELECTRIC CONSTANT FILMS / DISPOSITIVOS DE MICROONDAS UTILIZANDO FILMES DE ALTA CONSTANTE DIELÉTRICA
The growing demand for portable devices with more reduced size and weight has stimulated the search for materials with high dielectric constant and low losses in the microwave frequency range allowing circuit integration and miniaturization. In this work, a theoretical and experimental study of the use of high dielectric constant films in the fabrication of
Publicado em: 2010