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Mostrando ítems 41-50 de 163
Lentes metálicas basadas en el fenómeno de transmisión extraordinaria para conseguir índices de refracción negativos
(2009)
Contribución a congreso / Biltzarrerako ekarpena,
In this communication we report plano-concave
and bi-concave metamaterial lenses based on the close stack of
subwavelegnth hole arrays. Contrary to what is expected from
cut-off holes, an engineered array of holes ...
Cooperative detection applied to THz imaging cameras
(2009)
Contribución a congreso / Biltzarrerako ekarpena,
THz technology for developing imaging systems has recently aroused great interest, mainly due to the large number of applications in which these frequencies can be used: security, vision in hard environments, etc.
The ...
Introducción de la bocina en el lazo de optimización de sistemas de reflectores
(2005)
Contribución a congreso / Biltzarrerako ekarpena,
In the design process of a complete antenna
system based on reflectors, the feed real performance is
usually included once the reflectors have been optimized
with an ideal feed. In this paper, the proposal is to
include ...
A complete optimization-loop, including feeders, of antenna systems based on reflectors
(IEEE, 2005)
Contribución a congreso / Biltzarrerako ekarpena,
In the design process of a complete antenna system based on reflectors, the feed real
performance is usually included once the reflectors have been optimized with an ideal
feed. In this paper, the proposal is to include ...
Transición coaxial a guía doble ridge cargada
(2005)
Contribución a congreso / Biltzarrerako ekarpena,
In this paper a new method to design a
transition from coaxial waveguide to a loaded double
ridge waveguide is proposed. This method allows the use
of the large frequency bandwidth ridge waveguides
present. In the ...
Análisis de efecto de un superestrato left-handed en la apertura de una guía rectangular
(2005)
Contribución a congreso / Biltzarrerako ekarpena,
In this paper, results showing the experimental verification of the gain improvement of a rectangular waveguide antenna when a left-handed material (LHM) is used as superstrate are presented. The improvement has been ...
Radiation performances of a multifrequency dipole antenna array with a left handed superstrate
(2005)
Contribución a congreso / Biltzarrerako ekarpena,
In this paper, the radiation performances of a multifrequency antenna array (MFAA) which consists of
two dipoles (1 and 3) that are radiating at 9.57 GHz and other one (dipole 2) radiating at 11.98 GHz are
presented. In ...
Radiation performances of a dipole array configuration inserted in a left-handed media
(IEEE, 2005)
Contribución a congreso / Biltzarrerako ekarpena,
In this work, the radiation improvements achieved when Left Handed Media (LHM) are combined with dipole antennas has been analysed. The behavior of two dipole antennas in array configuration when a Left Handed superstrate ...
Research on metamaterials for antenna applications
(2005)
Contribución a congreso / Biltzarrerako ekarpena,
During the last 20 years a lot of attention has been paid to apply Electromagnetic Band Gap (EBG) technology
in different frequency ranges, from microwaves to optics. EBG technology is based on the use of periodic structures ...
Meta-material behaviour of the new Coherently Radiating Periodic Structures (CORPS)
(2005)
Contribución a congreso / Biltzarrerako ekarpena,
In this paper, the study of the new Coherently Radiating Periodic Structures (CORPS) like a Metamaterial
sets out. The shape of the structure under study is composed by two different layers, one layer is
an array of ...