Ara es mostren els items 125-144 de 254

    • 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'editorial
      In 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 ciclicidad en los nuevos planes de estudio 

      Correig Blanchar, Francesc Xavier; Jofre Roca, Lluís (1991-07)
      Article
      Accés restringit per política de l'editorial
    • Lens based switched beam antenna for a 5G smart repeater 

      Romeu Robert, Jordi; Blanch Boris, Sebastián; Pradell i Cara, Lluís; Barlabe Dalmau, Antoni; Rius Casals, Juan Manuel; Albert Galí, Miquel; Jofre Roca, Lluís; Mazzucco, Christian; Flamini, Roberto (2023-10)
      Article
      Accés obert
      A 16 switched beam lens based antenna with a coverage area of ±30° in the horizontal plane and from 0 to -20° in the vertical plane has been built and tested. The intended use of the antenna is as part of a smart repeater ...
    • Linear and Circular UWB Millimeter-Wave and Terahertz Monostatic Near-Field Synthetic Aperture Imaging 

      solano perez, jose antonio; Martinez-Ingles, Maria-Teresa; Molina-Garcia Pardo, Jose Maria; Romeu Robert, Jordi; Jofre Roca, Lluís; Rodríguez, José Victor; Mateo-Aroca, Antonio (Multidisciplinary Digital Publishing Institute (MDPI), 2020-03-10)
      Article
      Accés obert
      Millimeter-wave and terahertz frequencies offer unique characteristics to simultaneously obtain good spatial resolution and penetrability. In this paper, a robust near-field monostatic focusing technique is presented and ...
    • Linear array arrangement for microwave tomography 

      Peronnet, Guy; Bolomey, Jean Charles; Jofre Roca, Lluís (1984-09-01)
      Article
      Accés obert
      Recent developments both in measurement techniques and reconstruction algorithms have shown the possibility of quasi-real time microwave tomography. These technical developments always require more sophisticated experimental ...
    • Linear array diagnostic from near-field measurements 

      Romeu Robert, Jordi; Jofre Roca, Lluís; Soneira Ferrando, M. José; Clavera, Jordi (Institute of Electrical and Electronics Engineers (IEEE), 1989)
      Text en actes de congrés
      Accés obert
      The authors present an inversion procedure to obtain the current distribution on a linear array from a near-field measurement. Numerical simulations were performed for a 50-element linear array. Single elements are ...
    • LTCC-based dielectric flat lens performance evaluation at 94 GHz 

      Imbert Villà, Marc; Blanch Boris, Sebastián; Romeu Robert, Jordi; Jofre Roca, Lluís; Baquero Escudero, M. (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The design and performance evaluation of an inhomogeneous LTCC-based dielectric flat lens at 94 GHz is presented. A previously introduced dielectric flat lens design with its effective permittivity (r) circularly distributed ...
    • 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)
      Article
      Accés restringit per política de l'editorial
      The 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'editorial
      In 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
      Accés obert
    • 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 obert
      An 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)
      Text en actes de congrés
      Accés obert
      A 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)
      Text en actes de congrés
      Accés obert
    • Medida de sección recta radar con onda esférica en campo próximo 

      Broquetas Ibars, Antoni; Jofre Roca, Lluís; Cardama Aznar, Ángel (1992)
      Text en actes de congrés
      Accés obert
      The 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)
      Text en actes de congrés
      Accés obert
      Non 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 obert
      We 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 obert
      The 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)
      Text en actes de congrés
      Accés obert
      A 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)
      Text en actes de congrés
      Accés obert
      A 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 ...