Listar por autor UPNA "Gonzalo García, Ramón"
Mostrando ítems 1-20 de 81
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Alimentadores gaussianos en guía de onda rectangular
A new and efficient design of a rectangular corrugated waveguide mode converter, from TE10 mode in a smooth rectangular monomode waveguide to HE11 mode in a corrugated rectangular waveguide, is proposed. The main idea ... -
Análisis de efecto de un superestrato left-handed en la apertura de una guía rectangular
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 ... -
Antena corrugada con perfil gaussiano de gran ancho de banda
En este trabajo se presenta el diseño de una antena de bocina corrugada con más de un 40% de ancho de banda. Los patrones de radiación medidos coinciden muy bien con los simulados. Esta antena se puede usar en aplicaciones ... -
Antenas de bocina optimizadas para acoplar modos gaussianos de orden superior
The concept of higher order free space modes, gaussian-like beam modes can be applied to efficiently transport the power generated by a gyrotron for technological applications. Waveguide modes can be coupled properly to ... -
Boresight radiation of a dipole antenna with a uniform or non-uniform left handed superstrate
In this paper measurements of the radiation performances of a dipole fed by a coaxial balun and a dipole with a left handed superstrate based on a finite periodic repetition of a unit cell are compared. Two types ... -
Broadband radar cross-section reduction using AMC technology
This paper presents the design, fabrication and characterization of a planar broadband chessboard structure to reduce the radar cross-section (RCS) of an object. The chessboard like configuration is formed by combining two ... -
Choked-gaussian corrugated horn antenna design small global coverage horn antenna for TT&C with extremely low sidelobe level
Extremely low sidelobe horn antennas are often required for the actual technology. This type of horn antennas are important to avoid interference with other systems. In this paper we describe a new design implementing a ... -
Circuit and multipolar approaches to investigate the balance of powers in 2D scattering problems
Circuit and multipolar approaches are presented to investigate the correlation between absorption and scattering processes in 2D problems. This investigation was inspired by earlier works of Prof.R.E. Collin, which pointed ... -
Comparación entre antenas cónicas corrugadas y antenas gaussianas corrugadas
In this paper, a study of two equal size corrugated horn antennas; a conical and a gaussian profiled horn antenna (GPHA) has been developed. It will be demonstrated that GPHA´s provide lower sidelobes and wider bandwidths, ... -
Conical versus gaussian profiled corrugated horn antennas
In this paper, a study of two equal size corrugated horn antennas; a conical and a gaussian profiled horn antenna (GPHA) has been developed. It will be demonstrated that GPHA´s provide lower sidelobes and wider ... -
Consideraciones de paraxialidad en modos gaussianos de orden superior
Usually, the gaussian beam modes are assumed to be solutions of the wave equation in the free space. Nevertheless, these modes are obtained supposing some paraxial restrictions. Therefore, we will have to check if our ... -
Corrugated horn antenna noise temperature characterisation for the NRL water vapor millimeter-wave spectrometer project
In this paper the antenna noise temperature for two different corrugated horn antennas (old model and new model) for NRL WVMS is being characterized. The whole optical system will be simulated with Ticra’s GRASP software, ... -
Decoupling of multifrequency dipole antenna arrays for microwave imaging applications
The mutual coupling between elements of a multifrequency dipole antenna array is experimentally investigated by S-parameter measurements and planar near-field scanning of the radiated field. A multifrequency array with ... -
Desfasadores para microstrip empleando metamateriales
In this paper an application of LH materials at microwave frequencies (10GHz) is presented. A compact quarter-wave impedance transformer is proposed using alternating sections of left handed media (LHM) and conventional ... -
Design of a multifrequency antenna array with the use of left-handed superstrates
In this paper, the radiation performances of different antenna configuration based on Left-Handed superstrates are presented. First of all, the behaviour of a Left- Handed (LH) unit cell is analysed, showing a resonant ... -
Design of a planar meta-surface based on dipoles and wires for antenna applications
In this paper, the design of a planar meta-surface based on dipoles and wires is presented. The unit cell is formed by three independent layers, which contain two parallel dipoles and one wire. The behaviour of these ... -
Dipolos y metamateriales: mejora de las características de radiación
In this work, pass band properties of Left Handed Media (LHM) are demonstrated. These properties have been used in order to make a LHM super-substrate that is put over a dipole antenna. This super-substrate is going to ... -
Diseño de alimentadores optimizados para la cámara anecoica de la Universidad de Limoges
In this paper, high technology optimized feed horn designs are presented. These feed horns have been designed to improve the quite zone size and behaviour of the CATR of the CREAPE research team at Limoges University. Very ... -
Diseño de filtros en guía rectangular usando estructuras PBG's
A new application of dielectric periodic structures (also known as PBG) to build and design waveguide filters is presented. The periodic structures have some stop frequency bands, band gaps, defined by the geometry, ...