Now showing items 1-10 of 38
Weight vector estimation of circular arrays of antennas using Artificial Neural Networks
This paper presents a model for the control of the radiation pattern of a circular array of antennas, shaping it to address the radiation beam in the direction of the user, in order to reduce the transmitted power and to ...
GO Shaping of Omnidirectional Dual-Reflector Antennas with Arbitrary Main-Beam Direction in Elevation Plane by Connecting Conic Sections
(Hindawi Ltd, 2018-01-01)
This work discusses an alternative geometrical optics (GO) technique to synthesize omnidirectional dual-reflector antennas with uniform aperture phase distribution together with an arbitrary main-beam direction for the ...
Antenas planares multicamadas com materiais supercondutores e fotônico para comunicações móveis
(Universidade Federal do Rio Grande do NorteBRUFRNPrograma de Pós-Graduação em Engenharia ElétricaAutomação e Sistemas; Engenharia de Computação; Telecomunicações, 2006-08-04)
Recently, planar antennas have been studied due to their characteristics as well as the advantages that they offers when compared with another types of antennas. In the mobile communications area, the need for this kind ...
Design of a compact CMOS-compatible photonic antenna by topological optimization
Photonic antennas are critical in applications such as spectroscopy, photovoltaics, optical communications, holography, and sensors. In most of those applications, metallic antennas have been employed due to their reduced ...
Estudo do efeito de dipolos em arranjos de antenas adaptativas de sistemas de comunicação DS-CDMA
(Universidade Federal do Rio Grande do NorteBRUFRNPrograma de Pós-Graduação em Engenharia ElétricaAutomação e Sistemas; Engenharia de Computação; Telecomunicações, 2003-10-17)
This master dissertation introduces a study about some aspects that determine the aplication of adaptative arrays in DS-CDMA cellular systems. Some basics concepts and your evolution in the time about celular systems was ...
Controlling graphene plasmons with resonant metal antennas and spatial conductivity patterns
(The American Association for the Advancement of Science, 2014-05)
Graphene plasmons promise unique possibilities for controlling light in nanoscale devices and for merging optics with electronics. Here we introduce a versatile platform technology based on resonant optical antennas and ...