Dipoles
Mostrando 1-12 de 79 artigos, teses e dissertações.
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1. Compact, Broadband, and Omnidirectional Antenna Array for Millimeter-Wave Communication Systems
Abstract In this paper, a millimeter-wave printed quadrupole antenna is proposed. It consists of two symmetric printed dipoles that make the quadrupole radiating power omnidirectionally. Such an arrangement eliminates the influence of the ground as reflector. Simulation results show that the quadrupole antenna exhibits a broad impedance bandwidth and an enha
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-06
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2. Physics-Based Design of Microstrip Magnetic Dipoles Using Cavity Model
Abstract This paper presents an efficient technique of microstrip magnetic dipoles design that explores the physics ruling the antenna behavior not restricting to parametric analyses in a full-wave simulation software. The proposed approach makes use of the cavity model whose parameters are progressively enhanced by using full-wave electromagnetic simulation
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-03
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3. Efeitos do vento solar na magnetosfera terrestre: uma abordagem didática dos cinturões de Van Allen
Resumo Neste trabalho realizamos uma abordagem didática de aspectos relacionados ao geomagnetismo e como esses aspectos podem ser influenciados pela ação do vento solar. A carência de textos didáticos que promovam explicações em termos de conceitos de física básica foi a principal motivação para esse trabalho. Iniciamos com uma discussão históri
Rev. Bras. Ensino Fís.. Publicado em: 20/01/2020
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4. Investigation of Electromagnetic Radiation Emission during Sheet Metal Incremental Micro Forming
Edge dislocations within the plastic zone ahead of a crack tip form accelerated electric line dipoles which give rise to the electromagnetic radiation (EMR) emissions in metal and alloys. This paper reports an experimental investigation to determine EMR radiation during incremental microforming of a thin aluminum sheet. The EMR signals emit from aluminum gra
Mat. Res.. Publicado em: 18/12/2017
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5. Multiband FSS with Fractal Characteristic Based on Jerusalem Cross Geometry
Abstract This paper proposes a new Frequency Selective Surface (FSS) with modifications on the Jerusalem Cross (JC) geometry to provide a multiband response. Fractal levels are created by introducing concentric self-similar JC copies in the original unit cell. This modification results in new dipoles at the structure which allows for the appearance of new ba
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-12
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6. Optimization of Frequency Selective Surfaces with Crossed Dipoles Using the Taguchi's Method
Abstract There are several techniques for optimization of Frequency Selective Surfaces (FSS). Generally, in literature, we can find a few articles about the Taguchi's method applied in electromagnetic. This method is based on orthogonal arrays (OAs) and it is a procedure that reduces the number of iterations required in an optimization process. For a FSS opt
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-04
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7. Aplicação de novos materiais em transistores de efeito de campo ferroelétricos
In this work, we investigated the electrical properties of the polyelectrolyte PSS in its sodium form (PSS-Na, Polystyrene sulfonic in the sodium form) and acid form (PSS-H, polystyrene sulfonic in the acid form) and also doped with Fe3+ for application in Ferroelectric Field Effect Transistors (Fe-FET). The PSS-Na was acquired from Aldrich and PSS-H was obt
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/07/2012
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8. Scattering analysis of planar electric and magnetic dipoles in multilayered chiral structures
This paper describes a model for the analysis of multilay-ered chiral structures containing planar electric and magnetic scattering elements of arbitrary shape, illuminated by an elliptically polarized plane wave. The particular case of a single chiral layer is analyzed and the scattering matrices for single and dual electric and/or magnetic dipole distribut
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2012-06
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9. Dynamic evolution of vortex dipoles
Vortex dipoles are fundamental in fluid mechanics. They are found in geophysics, engineering and industry. The two necessary conditions to generate them are a plane flow and a generating force. In this work, an experimental design to generate vortex dipoles in stratified beds is presented. Vortex rings were generated under diferent volumetric flow conditions
Revista Brasileira de Ensino de Física. Publicado em: 2011-09
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10. Electromagnetic fields at the sea bottom induced by a line of immersed electric dipoles
A análise de campos eletromagnéticos causados por correntes alternadas ou transientes fluindo ao longo de um cabo na água do mar tem várias aplicações. Ela prove suporte à interpretação de dados geofísicos eletromagnéticos e aos procedimentos de segurança contra a ameaça de minas submarinas. A abordagem do problema emprega um potencial vetorial
Anais da Academia Brasileira de Ciências. Publicado em: 2011-09
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11. Estudo de um sistema clÃssico de dipolos magnÃticos carregados em estruturas de bicamadas. / Study of a classical bilayer system of charged magnetic dipoles
Estudamos as estruturas e as propriedades dinÃmicas de um cristal clÃssico bidimensional (2D) em bicamadas de partÃculas dipolares magnÃticas carregadas em um arranjo no qual os dipolos sÃo perpendiculares Ãs camadas e com mesma densidade de partÃculas em cada camada. A energia do sistema à devido à interaÃÃo carga - carga (interaÃÃo coulom- bia
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/08/2010
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12. Auto-organizaÃÃo de aglomerados finitos de dipolos magnÃticos carregados. / Self-Organizing of finite charged magnetic dipoles clusters
Estuda-se, neste trabalho, aglomerados bidimensionais de partÃculas dipolares magnÃticas, com carga elÃtrica superficial, confinadas em um potencial parabÃlico circular. As partÃculas possuem mesmo mÃdulo de momento de dipolo magnÃtico, assim como mesmos mÃdulo e sinal de carga superficial. O objetivo do presente estudo à a caracterizaÃÃo das conf
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/11/2009