Electromagnetic Theory
Mostrando 1-12 de 68 artigos, teses e dissertações.
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1. Electromagnetic Transients in Multiconductor Transmission Lines
Abstract The theory of multiconductor transmission lines is based on the principle of superposition. According to this principle, any electric or magnetic field can be represented as the sum of individual electric or magnetic fields. This theory is used to analyze and design electrical systems involving multiple conductors. In this work, the procedures for a
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. Dynamic Arrays Based on Magnetically Controlled Particles: Synthesis and Application
Growth mechanisms of dynamic granular arrays based on magnetically controlled particles are presented. Method of the external rotating magnetic field (ERMF), based on a dipole interaction of magnetic spherical Fe3O4 particles in highly ordered volume arrays is proposed and a design for its practical implementation is developed. The magnetic assembly can resu
Mat. Res.. Publicado em: 19/08/2019
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3. Sobre o surgimento das equações de Maxwell
Resumo Em seu Sobre linhas de força físicas Maxwell apresentou a primeira versão de suas equações eletromagnéticas, quando a luz foi então encarada como distúrbio cisalhante em um éter fluido e elástico. No presente artigo procuro discutir os detalhes deste modelo mecânico que serviu de trampolim para Maxwell propor a teoria eletromagnética da lu
Rev. Bras. Ensino Fís.. Publicado em: 01/07/2019
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4. Generation of Non-diffraction Vortex Beam and Its Application in Digital Communication
Abstract An axicon-frustum basin-type Bessel resonator is designed for generating non-diffraction vortex beams with opposite propagation directions under different conditions. Based on the theory of geometric optics, the principle of creating vortex beams is analyzed in this axicon-frustum basin-shaped resonant cavity. It is shown that a non-diffraction vort
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 19/06/2019
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5. Sobre as origens das Leis de Fresnel
Resumo Revisitamos o desenvolvimento da teoria ondulatória da luz, no período que se seguiu à hipótese de Fresnel de que o éter luminífero possuia natureza similar a de um sólido elástico. Examinamos como em tal teoria elástica da luz se produziu um legado presente, ainda hoje, nas entrelinhas do eletromagnetismo clássico, tomando as leis de Fresne
Rev. Bras. Ensino Fís.. Publicado em: 25/04/2019
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6. Theoretical Study of Plasmonically Induced Transparency Effect in Arrays of Graphene-Based Double Disk Resonators
Abstract In this paper, we consider coupled disk-shaped resonators separated by a thin dielectric substrate that can be used as frequency-tunable filters or as electromagnetic switches in the terahertz frequency band. The two disks are electromagnetically coupled and resonate with dipole plasmonic modes. By using a Temporal Coupled-Mode Theory based approach
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2019-03
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7. Materiales ferromagnéticos: “¿Cómo es eso que el vector H se da vuelta?”
One of the major difficulties that students find in the basic subjects of Electricity and Magnetism is the understanding of the magnetic properties of matter. In particular, the determination of the directions of magnetic vectors in simple devices constructed with ferromagnetic materials such as magnets, transformers and electromagnets. The confusion is comp
Rev. Bras. Ensino Fís.. Publicado em: 19/01/2017
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8. New Design Procedure to Determine the Taper Transition for Impedance Matching Between Microstrip Line and SIW Component
Abstract Normally the physical dimensions of the taper transition that realizes the impedance matching between the impedance of the feeding line built in microstrip line technology and the impedance of the component built in Substrate Integrated Waveguide (SIW) technology are obtained by computational optimization processes due the difficulty of analytical t
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-09
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9. Integration Analysis of Conceptual Design and Stealth-Aerodynamic Characteristics of Combat Aircraft
ABSTRACT In order to study stealth strike-fighter, an analysis on stealth-aerodynamic integration and conceptual design is conducted. A conceptual 3-D digital model with internal antiship missiles and air-to-air missiles is designed in CATIA software. Based on the physical optics and equivalent electromagnetic current methods, using the self-programmed RCSAn
J. Aerosp. Technol. Manag.. Publicado em: 2016-03
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10. Design of Frequency Selective Band Stop Shield Using Analytical Method
Abstract In this article, a high-order frequency selective band-stop EMC (electromagnetic compatibility) shield is designed using multilayer square loop while each loop resonates at the specific desired frequency. The glass material is picked out as the preferred substrate for the designing process. In contrast to the computationally intensive numerical appr
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2015-12
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11. Synthesis, characterization and microwave absorption of carbon-coated Cu nanocapsules
The microstructure and microwave absorption of carbon-coated Cu nanocapsules have been investigated. Carbon-coated Cu nanocapsules have been synthesized by an arc-discharge method. The paraffin-Cu/C nanocapsules composite shows excellent electromagnetic (EM) absorption properties. An optimal reflection loss (RL) value of - 40.0 dB is reached at 10.52 GHz for
Mat. Res.. Publicado em: 24/01/2014
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12. Geometry optimization for application of radio frequency signals on diamond samples
This work describes the design and optimization of a printed circuit board containing a rectangular half-loop coil designed to apply radio frequency signals on micrometric diamond crystals. The structure was optimized to maximize the magnetic field perpendicular to the coil at 2,87 GHz. In the optimization process we have used transmission line theory, circu
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12