Exploració per autor "Jofre Roca, Lluís"
Ara es mostren els items 191-210 de 254
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Radioenlace digital a 11 GHz para telemando y telecontrol
Artal, E.; Cardama Aznar, Ángel; Comerón Tejero, Adolfo; Corbella Sanahuja, Ignasi; Elias Fusté, Antoni; Ferrando, Miguel; Jofre Roca, Lluís; de los Reyes, Elías (Institute of Electrical and Electronics Engineers (IEEE), 1984)
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Accés obertA digital radio-relay link in the band 10.7- 11.7 GHz developed for the remote control system of ENHER is presented. The objectives were the construction of a reliable and yet low-cost transmitter-receiver. To accomplish ... -
Radiometric and spatial resolution constraints in millimeter-mave close-range passive screener systems
Nova, Enrique; Romeu Robert, Jordi; Torres Torres, Francisco; Pablos Hernández, Miriam; Riera, Jose Manuel; Broquetas Ibars, Antoni; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2013-04)
Article
Accés restringit per política de l'editorialThis paper presents a comparative study of the radiometric sensitivity and spatial resolution of three near-field (NF) passive screener systems: real aperture, 1-D synthetic aperture (SA), and 2-D SA radiometers are compared. ... -
Rapid near-field antenna testing via arrays of modulated scattering probes
Bolomey, Jean Charles; Cown, Barry J.; Jofre Roca, Lluís (1988-08-06)
Article
Accés obertKey results are summarized of efforts to significantly reduce the near-field measurement time by utilizing one- or two-dimensional arrays of modulated scattering probes in lieu of the single probe ordinarily used in ... -
Real time 100 GHz MST imaging retina
Alonso del Pino, María; Garg, V.; García Guerra, Carlos Enrique; Romeu Robert, Jordi; Llombart, Nuria; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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Accés restringit per política de l'editorialA real time tomographic imaging system at 100 GHz based on a retina and Modulated Scattered Technique (MST) is presented in this paper. It consists in applying a low frequency modulation to each probe of an array of antennas ... -
Receptor coherente para imágenes por microondas
de los Reyes, Elías; Jofre Roca, Lluís; Ferrando Bataller, Miquel (1984)
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Accés obertIn order to avoid heating in the microwave imaging of biological bodies a very high sensitivity is needed for the receiver. We present a low cost sensitive coherent microwave receiver in microstrip technology. -
Receptor para TV difundida directamente desde satélites
Artal, E.; Cardama Aznar, Ángel; Comerón Tejero, Adolfo; Corbella Sanahuja, Ignasi; Elias Fusté, Antoni; Ferrando, M.; Jofre Roca, Lluís; de los Reyes, Elías (Institute of Electrical and Electronics Engineers (IEEE), 1984)
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Accés obertThe direct broadcast satellite receiver in the 12 GHz band developed in the Electrophysics Department in cooperation with the R & D Departments of Mier Allende, S.A. and Tagra, S.A. is described. It features a low-noise ... -
Reconfigurable dual-polarized beam-steering broadband antenna using a crossed-strips geometry
Ramírez Arroyave, Germán Augusto; Zhou, Ivan; Blanch Boris, Sebastián; Towfiq, Asaduzzaman; Cetiner, Bedri Artug; Romeu Robert, Jordi; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2021-08)
Article
Accés obertIn this letter, a reconfigurable dual-polarized broadband antenna with beam-steering capabilities using a parasitic layer is proposed for 5G new radio (NR) frequency range 1 (FR-1) applications. The antenna is a dual-port ... -
Reconfigurable pixel-layer isolator for frequency-tunable on-frequency repeaters
Rodrigo López, Daniel; Díaz Tapia, Edgar; Jofre Roca, Lluís (2014)
Article
Accés restringit per política de l'editorialThe maximum gain in on-frequency repeaters is limited by the isolation level between their two antennas due to close-loop stability conditions. In this letter, a novel pixel-layer isolator for tunable on-frequency repeaters ... -
Reconstrucción de la reflectividad de blancos radar
Broquetas Ibars, Antoni; Rius Casals, Juan Manuel; Fabregas Canovas, Francisco Javier; Galmes, S; Jofre Roca, Lluís (Unión Científica Internacional de Radio (URSI), 1989)
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Accés obertProcessing radar cross section data is possible to image sorne properties of a target. The paper presents two radar imaging algorithms allowing the reconstruction of reflectivi ty distribution of the target or i ts ... -
Resonance-Based microwave technique for body implant sensing
González López, Giselle; Jofre Roca, Lluís; Amorós García de Valdecasas, Susana; Rodríguez Leor, Oriol; Gálvez Montón, Carolina; Bayés Genis, Antoni; O'Callaghan Castellà, Juan Manuel (Multidisciplinary Digital Publishing Institute (MDPI), 2019-11-03)
Article
Accés obertThere is an increasing need for safe and simple techniques for sensing devices and prostheses implanted inside the human body. Microwave wireless inspection may be an appropriate technique for it. The implanted device may ... -
Retina design for 100GHz MST imaging system
Alonso, Maria; Garg, V.; Nova, Enrique; Abril, Jordi; Romeu Robert, Jordi; Llombart, Nuria; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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Accés restringit per política de l'editorialA near field imaging system for THz tomographic imaging based on a MST retina (an array of real antennas) has been designed. The main adva ntage of this implementation is the absence of microwave transmission line ... -
RF MEMS reconfigurable two-band antenna
Zohur, Abdul; Mopidevi, Hema Swaroop; Rodrigo López, Daniel; Unlu, M.; Jofre Roca, Lluís; Cetiner, Bedri Artug (2013-01-09)
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RFID array probe for EM-field measurements
Capdevila Cascante, Santiago; Jofre Roca, Lluís; Bolomey, J.Ch; Romeu Robert, Jordi (IEEE Press. Institute of Electrical and Electronics Engineers, 2009-06)
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RFID array sensing
Capdevila Cascante, Santiago; Jofre Roca, Lluís; Romeu Robert, Jordi; Bolomey, J.Ch (2010)
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Accés obertIn this paper the use of RFID tags for the measurement of physical parameters in a distributed set of points is presented. Experimental results for two different scenarios are presented; the first uses a 2D RFID array to ... -
RFID based probes for EM-field measurements
Capdevila Cascante, Santiago; Massud, Muhammad; Serrano, Raquel; Aguasca Solé, Alberto; Blanch Boris, Sebastián; Romeu Robert, Jordi; Bolomey, J.Ch; Jofre Roca, Lluís (IEEE Press. Institute of Electrical and Electronics Engineers, 2009)
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Accés obertIn this paper the use of RFID for EM field measurement is studied. A novel RFID antenna with high tuning capabilities is presented and measured, and it is used in combination with several RFID IC to measure the EM ... -
Robust differential multi-frequency microwave imaging for breast cancer detection
Guardiola Garcia, Marta; Capdevila Cascante, Santiago; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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Accés restringit per política de l'editorialMicrowave imaging is a topic of continuous research for its potential in biomedical area and in particular for breast cancer detection. This paper presents a novel multi-frequency differential linearized (FDL) technique ... -
Scanner de microondas. Una alternativa a la radiación ionizante
Reyes, E De Los; Jofre Roca, Lluís; Ferrando Bataller, Miquel; Elias Fusté, Antoni; Cardama Aznar, Ángel; Broquetas Ibars, Antoni; Rius Casals, Juan Manuel; Ibañez, J; Ripollés, O (1987)
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Accés obertLa utilización de radiación de microondas para la obtención de imágenes tomográficas de cuerpos biológicos es un nuevo campo de investigación que puede englobarse dentro de los métodos de diagnóstico no invasivo. El elemento ... -
Sensitivity study of the microwave spiralimetric imaging
Jofre Roca, Lluís; Blanch Boris, Sebastián; Cardama Aznar, Ángel; Rius Casals, Juan Manuel; Torner Sabata, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2005)
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Accés restringit per política de l'editorialThe use of the spiral modes-electromagnetically related to the orbital momentum of the photons- at microwave frequencies for imaging purposes is studied and some preliminary numerical and experimental results for basic ... -
Sensores de fibra óptica
Torner Sabata, Lluís; Jofre Roca, Lluís (1994-07)
Article
Accés restringit per política de l'editorialEn esta comunicación se revisa brevemente el estado actual de la tecnología de los sensores de fibra óptica. Se introducen sus aplicaciones y tendencias futuras. -
Silicon micro-lens antennas for THz integrated arrays
Alonso del Pino, María; Llombart, Nuria; Lee, Clement; Jung, C.; Chattopadhyay, G.; Jofre Roca, Lluís; Mehdi, Imran (IEEE, 2011)
Article
Accés restringit per política de l'editorialIn this paper, we describe the characterization of silicon micro-lenses fabricated by two different techniques, one using laser micromachining and the other developed using photolithographical techniques. The micro-lens ...