Ara es mostren els items 191-210 de 254

    • 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)
      Text en actes de congrés
      Accés obert
      A 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'editorial
      This 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 obert
      Key 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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A 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)
      Text en actes de congrés
      Accés obert
      In 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)
      Text en actes de congrés
      Accés obert
      The 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 obert
      In 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'editorial
      The 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)
      Text en actes de congrés
      Accés obert
      Processing 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 obert
      There 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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A 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)
      Article
      Accés restringit per política de l'editorial
    • 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)
      Text en actes de congrés
      Accés obert
    • RFID array sensing 

      Capdevila Cascante, Santiago; Jofre Roca, Lluís; Romeu Robert, Jordi; Bolomey, J.Ch (2010)
      Text en actes de congrés
      Accés obert
      In 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)
      Text en actes de congrés
      Accés obert
      In 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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Microwave 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)
      Text en actes de congrés
      Accés obert
      La 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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The 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'editorial
      En 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'editorial
      In 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 ...