Exploració per autor "Jofre Roca, Lluís"
Ara es mostren els items 134-153 de 258
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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 (2024-04)
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)
Article
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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)
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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)
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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)
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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)
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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 ... -
Micrometric deformation imaging at W-Band
Abril, Jordi; Nova, Enrique; Broquetas Ibars, Antoni; Aguasca Solé, Alberto; Romeu Robert, Jordi; Jofre Roca, Lluís (IEEE, 2011)
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Accés restringit per política de l'editorialThe measurement of scattered signals at W Band can be exploited to form images of small deformations with precisions in the order of tenths of micrometers. In this paper an Interferometric Synthetic Aperture Radar setup ... -
Microstrip-fed 3D-printed H-sectorial horn phased array
Zhou, Ivan; Pradell i Cara, Lluís; López Villegas, José María; Vidal Martínez, Neus; Albert Gali, Miquel; Jofre Roca, Lluís; Romeu Robert, Jordi (Multidisciplinary Digital Publishing Institute (MDPI), 2022-07-16)
Article
Accés obertA 3D-printed phased array consisting of four H-Sectorial horn antennas of 200 g weight with an ultra-wideband rectangular-waveguide-to-microstrip-line transition operating over the whole LMDS and K bands (24.25–29.5 GHz) ... -
Microwave contactless current-sensing for live/dead differentiation of single bioparticles on a microfluidic platform
Palacios Arias, César Augusto; Jofre Cruanyes, Marc; Jofre Cruanyes, Lluís; Romeu Robert, Jordi; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2023-08-02)
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Accés restringit per política de l'editorialThe combination of microwave and microfluidic technologies enables the creation of efficient platforms to rapidly quantify live/dead bioparticles in industrial processes, biomedical research and environmental monitoring ... -
Microwave diffraction tomography for biomedical applications
Bolomey, Jean Charles; Izadnegahdar, Alain; Jofre Roca, Lluís; PICHOT DU MEZERAY, Christian; Peronnet, Guy (IEEE Microwave Theory and Techniques Society, 1982-11)
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Microwave Imaging of Multilayer Cylinders Using Optimization Techniques
Ferrando Bataller, Miquel; Broquetas Ibars, Antoni; Jofre Roca, Lluís; Rius Casals, Juan Manuel (Institute of Electrical and Electronics Engineers (IEEE), 1989)
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Accés obertThe authors present a novel approach to solving the problem of the reconstruction of arbitrary strong-scattering objects using optimization techniques. The algorithm is based on the minimization of the mean-squared error ... -
Microwave imaging of tissue blood content changes
Hawley, Mark; Broquetas Ibars, Antoni; Jofre Roca, Lluís; Bolomey, Jean Charles; Gaboriaud, Guillaume (1991-05)
Article
Accés restringit per política de l'editorialActive microwave imaging gives information on the dielectric properties of of the body, allowing the collection of data that are distinct from, but complementary to, those available from other imaging methods based on ... -
Microwave imaging techniques for biomedical applications
Joisel, A; Mallorquí Franquet, Jordi Joan; Broquetas Ibars, Antoni; Geffrin, J M; Joachimowicz, N; Vall·Llossera, M; Vall-Llossera Ferran, Mercedes Magdalena; Jofre Roca, Lluís; Bolomey, Jean Charles (Vincenzo Piuri and Mario Savino, 1999)
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Accés obertMicrowaves have been considered for medical applications involving the detection of organ movements and changes in tissue water content. More particularly cardiopulmonary interrogation via microwaves has resulted in various ...