Bandwidth Enhancement
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Assessment of Total Attenuation and Adaptive Scheme for Quality of Service Enhancement in Tropical Weather for Satellite Networks and 5G Applications in Nigeria
Abstract The dynamic weather condition is a major concern for optimum channel utilization in recent times, especially at higher frequencies with larger bandwidth for 5G applications. Over the years, rain-induced attenuation among the hydrometeors has been linked as the major cause of signal impairment especially at the frequency, f ≥ 10 GHz. However, when
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-06
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2. Bandwidth Enhancement of Microstrip Patch Antenna Using Metasurface
Abstract In this article, bandwidth enhancement of a microstrip patch antenna using a new kind of metasurface is discussed. This new geometry is used to generate new resonances in antenna and with an optimal position of the metasurface in relation to antenna we can overlap the resonances and obtain a large bandwidth. The proposed antenna showed a bandwidth f
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-03
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3. Improvement of Circularly Polarized Slot-Patch Antenna Parameters by Using Electromagnetic Band Gap Structures
Abstract This paper is devoted to the design of a novel Electromagnetic Band Gap (EBG) circularly polarized slot-patch antenna in multilayered configuration. The operating frequency band can be controlled via the disk radius and adjusting the slit lengths. An arrangement combining the circular slot-patch antenna design and feeding sources included are consid
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2016-12
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4. Ressoadores e guias dielÃtricos cilÃndricos operando em micro-ondas e Ãptica: antenas dielÃtricas e acopladores refletores de Bragg a fibra / Cylindrical dielectric resonators and waveguides operating at microwave and optics: dielectric antennas and fiber Bragg grating couplers
Duas contribuiÃÃes caracteristicamente distintas, nÃo obstante correlacionÃveis num mesmo sistema de telecomunicaÃÃo, sÃo apresentadas. A primeira versa sobre antenas ressoadoras constituÃdas por novas cerÃmicas dielÃtricas à base de Fe2O3. Os materiais desenvolvidos foram caracterizados na faixa de micro-ondas. Tratam-se de dielÃtricos com baixa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/11/2010
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5. Comparative analysis of circular and triangular gold nanodisks for field enhancement applications
In this paper, we present a quantitative comparison of circular and triangular gold nanodisks with the same length and thickness. The method of moments is used to solve numerically the scattering problem. With this model, we investigate the spatial near field distribution, spectral response, far field diagrams, and bandwidth wavelength of these particles. Ou
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2010-12
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6. Modeling of MEMS switches for RF applications. / Modelagem de chaves MEMS para aplicações em RF.
In this thesis, the main concepts of MEMS, their application, fabrication processes, components and systems are addressed. The objective of the thesis is a detailed study of MEMS switches for RF applications, that present good performance at high frequencies and with a potential for bandwidth improvement. More specifically, the study was deeply conducted for
Publicado em: 2007
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7. Efeitos de acoplamento e de banda de operação em redes de antenas adaptativas reais. / Coupling and operation bandwidth effects in real adaptive antenna arrays.
Smart antenna arrays are becoming more important in the expansion and in the enhancement of cellular telephony systems, specially in the third-generation that will need an even larger bandwidth. In this subject, many contributions from the scientific community have been provided with the goal of determining direction-of-arrival for incident signals, eliminat
Publicado em: 2005