Parabolic Antenna
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Analysis of Wet Antenna Losses on 11.843 GHz Slant Path in Nigeria and Comparison with Some Tropical Climates
Abstract The amount of water deposits on the receiving dish antenna can cause additional losses and consequently contaminate the actual slant-path attenuation. Only a few research works have been reported in the literature on the measurement of wet antenna attenuation (WAA) and the technique(s) of extracting the losses from the total attenuation in tropical
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. Structure Synthesis and Optimization of Feed Support Mechanisms for a Deployable Parabolic Antenna
ABSTRACT In this paper, a systematic method to synthesize parallel mechanisms for feed support mechanisms based on screw theory is proposed. First, the motion requirement of the feed support mechanism is studied. Then, a class of parallel mechanisms having a translational motion with different degrees of freedom is synthesized based on the constraint-synthes
J. Aerosp. Technol. Manag.. Publicado em: 2016-03
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3. Projeto e desenvolvimento de um sistema inteligente para alinhamento de uma antena parabólica receptora
O objetivo deste trabalho é projetar e desenvolver um sistema automatizado inteligente para o alinhamento de uma antena receptora com refletor parabólico aplicado a comunicação via satélite. Com base em procedimentos empíricos para o alinhamento manual de uma antena parabólica, foi concebida e desenvolvida uma solução tecnológica empregando hardwar
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/11/2011
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4. Projeto e implementação do controle de posição de uma antena de radar meteorológico através de servomecanismos. / Design and implementation of a weather-radar antenna position control using servomechanisms.
A classical radar antenna is basically composed of a primary source mounted at the focal point of a parabolic reflector. The illumination rule is established so that the desired beam-shape is attained, as precisely as possible. The physical motion of the set guarantees the coverage of the desired volume of exploitation. The actual text studies the design and
Publicado em: 2006
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5. O programa tv escola no município de Irecê : limites e possibilidades da educação a distância no interior do Brasil.
The present work intends to analyze the use of the TV Escola Program, an educational public policy created to strenghten education in Brazil by the means of introducting technologies in public schools. The research was developed in a school network inside Brazil, which provides a vision of the place, of the singularities of an educational system located in t
Publicado em: 2005
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6. Electron Cyclotron Emission in the TCABR Tokamak: An Experimental Study. / "Emissão Eletrociclotrônica no Tokamak TCABR: Um Estudo Experimental"
In this work, an experimental study of the Electron Cyclotron Emission (ECE) in the TCABR Tokamak, is described. An ECE sweeping heterodyne radiometer, operating in the 50-85 GHz frequency range, was installed, calibrated and used to detect ECE radiation in the second harmonic extraordinary mode from thermal plasma discharges. The noise temperature, amplitud
Publicado em: 2005
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7. A STUDY OF THE RADIO LINK ATTENUATION USING DOUBLE-PASSIVE REPEATERS / ESTUDO DA ATENUAÇÃO NOS ENLACES RADIOÉLETRICOS QUE EMPREGAM SISTEMAS REPETIDORES DUPLO PASSIVOS
This theoretical study gives the propagation loss through a microwave radio relay system using doublé-passive configuration in the Fresnel zone of the exciting parabolic antenna. Two cases are treated separately: a) Plane passive repeaters with equal rectangular apertures. b) Plane passive repeaters with nonequal square apertures. Based on the results obtai
Publicado em: 1974