Exploració per autor "Jofre Roca, Lluís"
Ara es mostren els items 108-127 de 254
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Far field condition in passive interferometry for security screening applications
Torres Torres, Francisco; Abril, Jordi; Nova, E.; Broquetas Ibars, Antoni; Jofre Roca, Lluís (IEEE, 2010)
Text en actes de congrés
Accés restringit per política de l'editorialThis work presents the main geometric constraints that affect the performance of a passive interferometer at 94 GHz for security screening applications by means of a reviewed definition of the Far Field condition in ... -
Far-field errors due to random noise in cylindrical near-field measurements
Romeu Robert, Jordi; Jofre Roca, Lluís; Cardama Aznar, Ángel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1992-01-31)
Article
Accés obertA full characterization of the far-field noise obtained from cylindrical near-field to far-field transformation, for a white Gaussian, space stationary, near-field noise is derived. A possible source for such noise is the ... -
Formación de imagen por microondas mediante agrupamientos lineales ortogonales
Jofre Roca, Lluís; Ferrando Bataller, Miquel; Bolomey, Jean Charles (Consejo Superior de Investigaciones Científicas (CSIC), 1986)
Text en actes de congrés
Accés obertCapabilities of a microwave imaging system working in the air by using two crossed linear arrays are described. The analytic expressions of the focalization procedures are derived and resolution and available volume of ... -
Formación de imagenes de blancos radar mediante tecnicas de apertura sintetica inversa con iluminación de onda esferica en campo próximo (SWISAR)
Broquetas Ibars, Antoni; Garriga, Adan; Jofre Roca, Lluís; Cardama Aznar, Ángel (1991)
Text en actes de congrés
Accés obertThe paper presents a new Inverse Synthetic Aperture Radar (ISAR) algorithm intended for radar targets reflectivity imaging from scattering measurements. The method is based on a spherical wave near-field illumination of ... -
Formación de imágenes 3D de reflectividad radar en campo próximo con geometría de exploración esférica
Broquetas Ibars, Antoni; Jofre Roca, Lluís (1994)
Text en actes de congrés
Accés obertThis document presents an algorithm for the reconstruction of 3D radar reflectivity images using spherical-wave ISAR techniques. The target is illuminated with an spherical wave and near-field backscatterig measurements ... -
Frequency and radiation pattern reconfigurability of a multi-size pixel antenna
Rodrigo López, Daniel; Jofre Roca, Lluís (2012)
Article
Accés restringit per política de l'editorialPixel reconfigurable apertures constitute one of the most adaptable structures regarding antenna reconfiguration, being capable to achieve frequency and pattern compound reconfiguration. However, pixel antennas require ... -
Genetic reconfigurability of a multi-size pixelled antenna
Rodrigo López, Daniel; Jofre Roca, Lluís; Unlu, M.; Damgaci, Yacine; Cetiner, Bedri Artug; Romeu Robert, Jordi (2010)
Text en actes de congrés
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GRECO: graphical electromagnetic computing for RCS prediction in real time
Rius Casals, Juan Manuel; Ferrando Bataller, Miguel; Jofre Roca, Lluís (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1993-04-01)
Article
Accés obertAn innovative approach to computing the high-frequency radar cross sections (RCSs) of complex radar targets in real time, using a 3-D graphics workstation, is presented. The target (typically, an aircraft) is modeled with ... -
High impedance monopole antenna for indoor terahertz communication system
Yazgan, Ayhan; Romeu Robert, Jordi; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2017)
Comunicació de congrés
Accés restringit per política de l'editorialIn this study, a wideband terahertz antenna for indoor wireless communication systems is proposed. Antenna has high input impedance which is reasonable for terahertz systems due to the high output impedance of terahertz ... -
High-frequency RCS of complex radar targets in real time
Rius Casals, Juan Manuel; Ferrando Bataller, Miguel; Jofre Roca, Lluís (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1993-09-01)
Article
Accés obertThis paper presents a new and original approach for computing the high-frequency radar cross section (RCS) of complex radar targets in real time with a 3-D graphics workstation. The aircraft is modeled with I-DEAS solid ... -
Hybrid massive MIMO for urban V2I: Sub-6 GHz vs mmWave performance assessment
Pfadler, Andreas; Ballesteros Sánchez, Christian; Romeu Robert, Jordi; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2020-03)
Article
Accés obertThe relevance of vehicle communications in next-generation networks entails the necessity of studying their performance in the framework of upcoming massive architectures. In this regard, a study of the wireless channel ... -
Identificación selectiva de centros de dispersion radar utilizando tecnicas ISAR
Fabregas Canovas, Francisco Javier; Broquetas Ibars, Antoni; Jofre Roca, Lluís (1991)
Text en actes de congrés
Accés obertThis paper presents an ISAR technique which is able to identify the scattering mechanisms in the target structure wich are responsible of each significant lo be of the RCS vs. angle diagram. The technique is based on a ... -
In-cabin 120 GHz radar system for functional human breathing monitoring in a 3D scenario
López Montero, María José; Aguasca Solé, Alberto; Romeu Robert, Jordi; Jofre Roca, Lluís (Íñigo Cuiñas Gómez, 2021)
Text en actes de congrés
Accés obertDriving is one of the activities that takes a significant part of a person’s time, that is why monitoring vital signs is useful for the wellness of the occupants of the vehicle. One of the vital signs that provides more ... -
In-cabin MIMO radar system for human dysfunctional breathing detection
López Montero, María José; Palacios Arias, César Augusto; Romeu Robert, Jordi; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2022-12-15)
Article
Accés obertThe integration of wireless sensors into the automotive industry is making vehicles increasingly safe and autonomous. At present, vehicles are equipped with external sensors that facilitate maneuverability and braking and ... -
Increased dynamic range for RFID EM-field measurements
Capdevila Cascante, Santiago; Romeu Robert, Jordi; Jofre Roca, Lluís; Bolomey, Jean Charles (Institute of Electrical and Electronics Engineers (IEEE), 2014)
Text en actes de congrés
Accés restringit per política de l'editorialThis paper presents a new methodology to measure the electromagnetic (EM) field using RFID tags, overcoming the limitations in dynamic range arisen by the conventional excitation of RFID tags. The methodology consists in ... -
Interference rejection using frequency and pattern reconfigurable antennas
Rodrigo López, Daniel; Romeu Robert, Jordi; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2012)
Text en actes de congrés
Accés restringit per política de l'editorialInterference rejection by taking advantage of the radiation pattern diversity of a reconfigurable antenna is considered. It is proposed to use simultaneously frequency and radiation reconfiguration to extend interference ... -
Isofrequency-reconfigurable 8-bit RF repeater
Díaz Tapia, Edgar; Grau, Alfred; Rodriguez De Luis, Javier; de Flaviis, Franco; Jofre Roca, Lluís (2011-11-02)
Article
Accés restringit per política de l'editorialA novel isofrequency-reconfigurable RF repeater operating at 4.5 GHz is presented. The repeater uses a total of eight reconfigurable parasitic dipole elements to enhance and reconfigure the isolation level between the ... -
Ku-band flat lens design for satellite TV applications
Imbert Villà, Marc; Romeu Robert, Jordi; Jofre Roca, Lluís; Papió, Anna; de Flaviis, Franco (Institute of Electrical and Electronics Engineers (IEEE), 2014)
Text en actes de congrés
Accés restringit per política de l'editorialIn this paper, the design of a dielectric flat lens to operate in the Ku-band for satellite communications is presented. Modern dishes intended for home television are generally bulky and heavy. Moreover, the costs of ... -
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
Accés restringit per política de l'editorial