Ara es mostren els items 207-226 de 254

    • 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 ...
    • Silicon micromachined lens antenna for THz integrated heterodyne arrays 

      Llombart Juan, Nuria; Lee, Choonsup; Alonso del Pino, María; Chattopadhyay, Goutam; Jung Kubiak, Cecile; Jofre Roca, Lluís; Mehdi, Imran (Institute of Electrical and Electronics Engineers (IEEE), 2013-09)
      Article
      Accés restringit per política de l'editorial
      In this paper, we present the design, fabrication, and measurements of a lens THz antenna that can be fabricated using conventional photolithography and deep reactive etching processes. The antenna is composed of an extended ...
    • Simplified WDM optical beamforming network for large antenna arrays 

      Vidal Rodríguez, Borja; Mengual Chulia, Teresa; Ibáñez López, Cristina; Martí Canalez, Javier; McKenzie, Iain; Vez, Emilio; Santamaría, Javier; Dalmases Marquina, Francesc; Jofre Roca, Lluís (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-05-31)
      Article
      Accés obert
      A novel approach to simplify optical beamforming networks based on wavelength-division-multiplexing (WDM) optical sources and a dispersive medium is proposed. The technique relies on the combination of dispersive and ...
    • Simulation of shipborne small HF antennas with RWG discretization and fast solver 

      Rius Casals, Juan Manuel; Jofre Roca, Lluís; Tamayo Palau, José María; Heldring, Alexander; Úbeda Farré, Eduard (2010)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper, an alternative approach has been used to analyze an electrically small antenna (1.2m in the 2-30 MHz band) in a large ship (238m length) using a generic EFIE simulation code with Rao, Wilton and Glisson (RWG) ...
    • Sistema cilíndrico para tomografía rápida de microondas 

      Jofre Roca, Lluís; de los Reyes, Elías; Elias Fusté, Antoni; Ferrando Bataller, Miquel; Romeu Robert, Jordi; Baquero, M; Rius Casals, Juan Manuel (Unión Científica Internacional de Radio (URSI), 1986)
      Text en actes de congrés
      Accés obert
    • Sistema en banda X para la reconstrucción de imágenes 

      Jofre Roca, Lluís; Ferrando Bataller, Miquel; de los Reyes, Elías; Berenguer Sau, Jordi; Sorolla, M. (1984)
      Text en actes de congrés
      Accés obert
      This paper describes the theoretical study and experimental set-up for a quasi-real-time active microwave imaging system in band- X. The main contributions are related to the spectral algoritms for the reconstruction ...
    • Small pixelled antenna with mems-reconfigurable radiation pattern 

      Rodrigo López, Daniel; Damgaci, Yacine; Unlu, M.; Jofre Roca, Lluís; Cetiner, Bedri Artug (2010)
      Text en actes de congrés
      Accés obert
    • Small-size broadband multi-element antenna for RF/wireless systems 

      Cetiner, Bedri Artug; Jofre Roca, Lluís; Qian, J. Y.; Flaviis, Franco de (IEEE, 2003-10-31)
      Article
      Accés obert
      We present a small-size broadband antenna specifically designed for integration with RF/wireless communication systems. The antenna is built on a printed circuit board and fed by a coplanar waveguide (CPW) to allow further ...
    • Spectral iterative algorithm for RCS computation in electrically large or intermediate perfectly conducting cavities 

      Rius Casals, Juan Manuel; Lozano Solsona, Angel; Cardama Aznar, Ángel; Jofre Roca, Lluís (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1994-06-01)
      Article
      Accés obert
      A novel algorithm designed to compute efficiently and accurately the high-frequency electromagnetic scattering from open-ended waveguide cavities is presented. The cavity is converted into a stepped-waveguide model so that ...
    • Spherical wave near-field imaging and radar cross-section measurement 

      Broquetas Ibars, Antoni; Palau, Josep; Jofre Roca, Lluís; Cardama Aznar, Ángel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1998-05-31)
      Article
      Accés obert
      The paper presents a new inverse synthetic aperture radar (ISAR) algorithm intended for radar cross-section (RCS) imaging and measurement from scattered fields. The method, based on a spherical-wave near-field illumination ...
    • Study of interconnecting switch currents in reconfigurable parasitic layer antennas 

      Ramirez, German; Araque, Javier; Ballesteros Sánchez, Christian; Blanch Boris, Sebastián; Romeu Robert, Jordi; Cetiner, Bedri Artug; Jofre Roca, Lluís (2019)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      This work presents an approach for calculating the currents across the switches of a reconfigurable parasitic layer intended to add beam-steering capabilities to a reference antenna. The method of analysis is based on the ...
    • Study on beamforming V2I scenarios for sub-6 GHz and mmWave channels 

      Ballesteros Sánchez, Christian; Ramírez Arroyave, Germán Augusto; Montero Bayo, Luca; Romeu Robert, Jordi; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Text en actes de congrés
      Accés obert
      The study of the wireless channel between a hybrid massive MIMO Base Station (BS) and a vehicular platform is proposed. Several multi-antenna geometries and MIMO architectures in both vehicle and BS are numerically modeled ...
    • Subsistemas de radiofrecuencia para tomografía de microondas 

      de los Reyes, Elías; Jofre Roca, Lluís; Ferrando Bataller, Miquel; Elias Fusté, Antoni; Baquero, M; Romeu Robert, Jordi; Rius Casals, Juan Manuel (Unión Científica Internacional de Radio (URSI), 1986)
      Text en actes de congrés
      Accés obert
    • Superheterodyne microwave system for the detection of bioparticles with coplanar electrodes on a microfluidic platform 

      Palacios Arias, César Augusto; Jofre Cruanyes, Marc; Jofre Cruanyes, Lluís; Romeu Robert, Jordi; Jofre Roca, Lluís (2022-04-08)
      Article
      Accés obert
      The combination of microwave and microfluidic technologies has the potential to enable wireless monitoring and interaction with bioparticles, facilitating, in this way, the exploration of a still largely uncharted territory ...
    • Supervised machine learning assisted driving stress monitoring MIMO radar system 

      López Montero, María José; Palacios Arias, César Augusto; Romeu Robert, Jordi; Jofre Roca, Lluís (2023-12-01)
      Article
      Accés obert
      Factors such as road traffic, challenging ambient temperature conditions, and extended periods of driving have detrimental effects on the physical and mental well-being of a driver. These factors can alter the stress levels, ...
    • Switched-beam antenna array for 60 GHz WPAN 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'editorial
      In this paper, the design of a switched-beam antenna array to operate in the 60 GHz band for short-range WPAN applications is presented. In order to overcome the high path-loss attenuation at millimeter-wave frequencies ...
    • Target spinor calibration (TSC) for polarimetric radar cross-section measurements 

      Fabregas Canovas, Francisco Javier; Romeu Robert, Jordi; Broquetas Ibars, Antoni; Jofre Roca, Lluís (IEE-INST ELEC ENG, 1995-09-01)
      Article
      Accés obert
      A new polarimetric calibration method is proposed based on scattering matrix decomposition, via Pauli matrices. This scheme operates with the Pauli target vectors instead of the scattering matrix. The base elements of the ...