Exploració per autor "Jofre Roca, Lluís"
Ara es mostren els items 126-145 de 254
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La adaptacion del plan nacional de evaluacion de la calidad de las universidades al contexto de una universidad con estructura matricial de centros y departamentos: el caso de la universidad politecnica de cataluña
Jofre Roca, Lluís; Rotger, Jordi (1998-05)
Article
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La ciclicidad en los nuevos planes de estudio
Correig Blanchar, Francesc Xavier; Jofre Roca, Lluís (1991-07)
Article
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Lens based switched beam antenna for a 5G smart repeater
Romeu Robert, Jordi; Blanch Boris, Sebastián; Pradell i Cara, Lluís; Barlabe Dalmau, Antoni; Rius Casals, Juan Manuel; Albert Galí, Miquel; Jofre Roca, Lluís; Mazzucco, Christian; Flamini, Roberto (2023-10)
Article
Accés obertA 16 switched beam lens based antenna with a coverage area of ±30° in the horizontal plane and from 0 to -20° in the vertical plane has been built and tested. The intended use of the antenna is as part of a smart repeater ... -
Linear and Circular UWB Millimeter-Wave and Terahertz Monostatic Near-Field Synthetic Aperture Imaging
solano perez, jose antonio; Martinez-Ingles, Maria-Teresa; Molina-Garcia Pardo, Jose Maria; Romeu Robert, Jordi; Jofre Roca, Lluís; Rodríguez, José Victor; Mateo-Aroca, Antonio (Multidisciplinary Digital Publishing Institute (MDPI), 2020-03-10)
Article
Accés obertMillimeter-wave and terahertz frequencies offer unique characteristics to simultaneously obtain good spatial resolution and penetrability. In this paper, a robust near-field monostatic focusing technique is presented and ... -
Linear array arrangement for microwave tomography
Peronnet, Guy; Bolomey, Jean Charles; Jofre Roca, Lluís (1984-09-01)
Article
Accés obertRecent developments both in measurement techniques and reconstruction algorithms have shown the possibility of quasi-real time microwave tomography. These technical developments always require more sophisticated experimental ... -
Linear array diagnostic from near-field measurements
Romeu Robert, Jordi; Jofre Roca, Lluís; Soneira Ferrando, M. José; Clavera, Jordi (Institute of Electrical and Electronics Engineers (IEEE), 1989)
Text en actes de congrés
Accés obertThe authors present an inversion procedure to obtain the current distribution on a linear array from a near-field measurement. Numerical simulations were performed for a 50-element linear array. Single elements are ... -
LTCC-based dielectric flat lens performance evaluation at 94 GHz
Imbert Villà, Marc; Blanch Boris, Sebastián; Romeu Robert, Jordi; Jofre Roca, Lluís; Baquero Escudero, M. (Institute of Electrical and Electronics Engineers (IEEE), 2016)
Text en actes de congrés
Accés restringit per política de l'editorialThe design and performance evaluation of an inhomogeneous LTCC-based dielectric flat lens at 94 GHz is presented. A previously introduced dielectric flat lens design with its effective permittivity (r) circularly distributed ... -
Magnetoelectric dipole antenna framework supporting orbital angular momentum modes
Jofre Cruanyes, Marc; Akazzim, Youness; Blanch Boris, Sebastián; Romeu Robert, Jordi; Cetiner, Bedri Artug; Jofre Roca, Lluís (2024)
Article
Accés restringit per política de l'editorialThe ability to utilize resources to meet the need of growing diversity of communication services and user behavior marks the future of cognitive wireless communication systems. Cognitive wireless technologies for vehicular ... -
Matching layer design to improve the performance of an inhomogeneous dielectric flat lens at millimeter-wave frequencies
Imbert Villà, Marc; Romeu Robert, Jordi; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2015)
Text en actes de congrés
Accés restringit per política de l'editorialIn this paper, the design of a matching layer to increase the maximum achievable gain, reduce the back-radiation, and enhance the bandwidth performance of a dielectric flat lens antenna for millimeter-wave applications is ... -
Medical imaging with a microwave tomographic scanner
Jofre Roca, Lluís; Hawley, M S; Broquetas Ibars, Antoni; Reyes Davó, Elías de Los; Ferrando Bataller, Miquel; Elias Fusté, Antoni (1990-03)
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Medida de antenas en campo próximo sobre una superficie cilíndrica
Jofre Roca, Lluís; Cardama Aznar, Ángel; Ferrando Bataller, Miquel (Unión Científica Internacional de Radio (URSI), 1983)
Text en actes de congrés
Accés obertAn efficient formulation for far-field reconstruction from near-field measurements on a cylinder is presented. An experimental setup is devoted to the study of the influence on the reconstruction of the different geometric ... -
Medida de antenas en un sistema de campo próximo semicompacto
Cardama Aznar, Ángel; Ferrando Bataller, Miquel; Jofre Roca, Lluís (1987)
Text en actes de congrés
Accés obertA synthesis method of uniform cylindrical waves of finite extension is presented, based on an optimized linear current distribution, obtained by an iterative method in the espectral domain. Substituting in a cylindrical ... -
Medida de RCS con onda esférica en campo próximo
Palau, J.; Broquetas Ibars, Antoni; Jofre Roca, Lluís; Cardama Aznar, Ángel (Universidad de Málaga, 1992)
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Medida de sección recta radar con onda esférica en campo próximo
Broquetas Ibars, Antoni; Jofre Roca, Lluís; Cardama Aznar, Ángel (1992)
Text en actes de congrés
Accés obertThe paper presents a new Inverse Synthetic Aperture Radar (ISAR) algorithm intended for Radar Cross Section (RCS) measurement from scattering fields. The method is based on a spherical wave near-field illumination of the ... -
Medida no destructiva del perfil de índice en fibras ópticas
Cardama Aznar, Ángel; Jofre Roca, Lluís (1981)
Text en actes de congrés
Accés obertNon destructive methods for the measurement of index profiles of optical fibers are presented, with emphasis placed on those based on scattering by incoherent light and the focusing method. Computer programs for calculation ... -
Medida y optimización de alimentadores primarios para reflectores parabólicos
Ferrando Bataller, Miquel; Jofre Roca, Lluís; Cardama Aznar, Ángel (Universidad de Sevilla, 1984)
Text en actes de congrés
Accés obertWe describe in this paper a theoretical and experimental procedure for the caracterization of parabolic antenna feeds. The experimental set-up and the algorithms for the measurement and optimization of these antennas are ... -
Mems integrated reconfigurable antenna for cognitive public safety radios
Khoshniat, A.; Mopidevi, H.; Damgaci, Yacine; Rodrigo López, David; Jofre Roca, Lluís; Centiner, Bedri Artug (2010)
Text en actes de congrés
Accés obertThe frequency reconfigurable volumetric PIFA presented in this paper is designed to switch between two US public-safety bands, one operating at 700MHz and the other having a bandwidth of 17% around 850MHz - in effect ... -
MEMS-reconfigurable antenna based on a multi-size pixelled geometry
Rodrigo, Daniel; Damgaci, T.; Cetiner, Bedri Artug; Romeu Robert, Jordi; Jofre Roca, Lluís (2010)
Text en actes de congrés
Accés obertA MEMS reconfigurable antenna with beam steering capability and resonance frequency reconfigurability is presented. The design is based in an interconnected patch grid structure and employs a hybrid geometry with different ... -
Métodos híbridos para análisis de la difracción y sección recta radar de cuerpos metálicos complejos
Rius Casals, Juan Manuel; Ferrando Bataller, Miquel; Broquetas Ibars, Antoni; Jofre Roca, Lluís (Unión Científica Internacional de Radio (URSI), 1989)
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Accés obertA set of algorithms and procedures to compute radar cross section (RCS) of aircraft are presented. The aircraft will be defined by a solid modelling data base. The hardware capabilities of a 3-D graphics accelerator will ... -
Métodos numéricos de análisis de antenas parabólicas
Jofre Roca, Lluís; Ferrando Bataller, Miquel; Cardama Aznar, Ángel (Universidad de Cantabria, 1982)
Text en actes de congrés
Accés obertAn algorithm, based in the Bessel- Jacobi method, is presented wich allows to obtain an approximation for the radiation characteristics of parabolic-reflector antennas from knowledge of the field distribution on the two ...