Equivalent Circuit
Mostrando 1-12 de 112 artigos, teses e dissertações.
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1. Design and Implementation of Microwave Dual-Band Pass Interdigital Filter Using an Analytical Approach
Abstract In this paper, benefiting from frequency transformation between the normalized frequency domain of low-pass prototype frequencies and the real frequency domain of the filter, a purely analytical procedure for dual-band filter design is used. The coupling matrix of the filter is analytically extracted, without the need to perform numerical optimizati
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. Radiation Efficiency of an Electrically Small Dual-band UHF Microstrip Patch Antenna Using Wheeler Cap Method
Abstract Determining the radiation efficiency of an antenna is a difficult task that becomes challenging when it is about electrically small antennas. This work investigates the applicability of the Wheeler cap method to measure the radiation efficiency of a UHF dual-band compact microstrip patch antenna. An overview of Wheeler method is presented. An adapta
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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3. A 2.4 GHz Coplanar Solar Cell Patch Antenna with a Semi-Analytical Evaluation of Temperature Effects
Abstract Solar cells integrated with antennas have aroused scientific interest as an attractive energy source alternative in low power devices for IoT and Wireless Sensor Network applications. Since the space for all components in the systems is scarce, different integration ideas have been proposed in this field. However, further analysis of the performance
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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4. Proposed Technique of Analysis for Absorber/Transmitter Frequency Selective Surfaces
Abstract In this paper, we propose a simple technique to analyze absorber/transmitter frequency selective surfaces (FSS). The structure is formed by two FSS, one resistive and one conductive. Both FSS are printed on an FR4 dielectric substrate. The square loop and crossed dipole are the geometries considered in this paper. The technique combines two simple a
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-06
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5. Comparison Between Three- and Four-coil Wireless Power Transfer Systems with Resonant Coils
Abstract In this paper, it is demonstrated that the efficiency and ability to transfer power to the load in three-coil wireless power transfer (WPT) systems are always higher than in equivalent four-coil ones. On the other hand, it is shown that there are features attainable in four-coil WPT system that are not in three-coil ones. For instance, in a four-coi
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-03
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6. Metamaterial-Fractal-Defected Ground Structure Concepts Combining for Highly Miniaturized Triple-Band Antenna Design
Abstract In this paper, a novel method is proposed to increase the gain and radiation efficiency of a compact patch antenna. By employing a combination of three efficient techniques, we have developed a multi-resonance L-DGS antenna with a high gain of 5 dB and an efficiency of 99.6%. Furthermore, a novel compact Double Negative metamaterial unit cell and it
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-12
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7. Modeling the Resonant Behavior of Continuously Reconfigurable FSS Based on Four Arms Star Geometry
Abstract A modeling of the resonant behavior of a continuously reconfigurable frequency selective surface, FSS, is described in this paper. The FSS is based on four arms star geometry and its reconfigurability is achieved by the use of varactors. FSS, four arms star geometry and varactor principles are explained. Considering available a set of measured or nu
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-09
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8. Estudo de recobrimentos de silicato e aluminato obtidos por oxidação por plasma eletrolítico em liga de alumínio
RESUMO As ligas de Alumínio são utilizadas para diversas finalidades e para a maioria dos casos a superfície desses materiais precisa ser modificada a fim de se melhorar propriedades como resistência ao desgaste e corrosão. Neste cenário, o processo de oxidação por plasma eletrolítico (PEO) surge como uma alternativa viável para produção de recob
Matéria (Rio J.). Publicado em: 20/05/2019
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9. Efecto de la composición sobre el comportamiento frente a la corrosión de aceros inoxidables austeníticos y martensíticos
ABSTRACT The aim of this work is to study the electrochemical behavior of a series of stainless steels in NaCl solution (10000 ppm Cl-) at room temperature. Considering the differences in structures (austenitic and martensitic) and the composition of alloys, a relationship between their electrochemical behavior and PREN (Pitting resistance equivalent number)
Matéria (Rio J.). Publicado em: 19/07/2018
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10. Caracterización electroquímica de películas de óxido de zinc obtenidas por anodizado en medio alcalino
ABSTRACT Zinc Oxide is a material of particular interest because of its unique optical and electrical properties, which are explored for many applications in optoelectronics and nanoelectronics; and it that can be synthesized economically by the technique of anodization. In this work, the potentiostatic anodization technique was used in dilute NaOH solution,
Matéria (Rio J.). Publicado em: 19/07/2018
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11. Structural, optical and electrical properties of Ni-doped Co3O4 prepared via Sol-Gel technique
In this article, Nickel doped Cobalt oxide thin films and powders have been prepared on glass substrates using sol gel based dip coating process in order to investigate their optical, structural and electrical properties. The Ni concentration was changed from 0 to 9 wt(%).The synthesized samples were characterised by Ultraviolete visible analysis, X-ray diff
Mat. Res.. Publicado em: 07/02/2018
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12. A Novel Design of an H-shaped Microstrip Diplexer
Abstract In this paper, a new microstrip diplexer using modified H-shaped resonators with a compact size and high isolation is presented. This circuit is designed for the ISM band at 2.4 GHz and GPS at 1.575 GHz. The proposed diplexer is formed by connecting two band-pass filters designed by using the modified H-shaped resonator and tapped microstrip Input/o
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-12