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Ara es mostren els items 79-98 de 258

    • Design of minimum nonlinear distortion reconfigurable antennas for next-generation communication systems 

      Ramírez Arroyave, Germán Augusto; Barlabe Dalmau, Antoni; Pradell i Cara, Lluís; Araque Araque, Javier Leonardo; Cetiner, Bedri Artug; Jofre Roca, Lluís (Multidisciplinary Digital Publishing Institute (MDPI), 2022-03-01)
      Capítol de llibre
      Accés obert
      Nonlinear effects in the radio front-end can degrade communication quality and system performance. In this paper we present a new design technique for reconfigurable antennas that minimizes the nonlinear distortion and ...

    • Design of minimum nonlinear distortion reconfigurable antennas for next-generation communication systems 

      Ramírez Arroyave, Germán Augusto; Barlabe Dalmau, Antoni; Pradell i Cara, Lluís; Araque Araque, Javier Leonardo; Cetiner, Bedri Artug; Jofre Roca, Lluís (2021-04-01)
      Article
      Accés obert
      Nonlinear effects in the radio front-end can degrade communication quality and system performance. In this paper we present a new design technique for reconfigurable antennas that minimizes the nonlinear distortion and ...

    • Desplegament de recursos en línea per a l’avaluació i l’autoaprenentage dels alumnes, i foment de l’especialització i competències transversals en el màster MERIT 

      Pradell i Cara, Lluís; Cardama Aznar, Ángel; Canal Bienzobas, Fernando; Jofre Roca, Lluís; Junyent Giralt, Gabriel; Herranz Luis, Jaime; Mallorquí Franquet, Jordi Joan; Nadeu Camprubí, Climent; Pagès Zamora, Alba Maria; Pradell i Cara, Lluís; Rius Casals, Juan Manuel; Rodríguez Fonollosa, Javier; Romeu Robert, Jordi; Coderch Collell, Marcel; Kerans, Mary Ellen; Law, Carolyn; García Hernández, Antonio; Gutiérrez Martos, David; Hernández Bonet, Antoni; Ferrer Bosch, Anna; Pérez Trufero, Javier; Torre Lara, Jordi de la; Torres Matabosch, Núria (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2010-02-11)
      Comunicació de congrés / Text en actes de congrés
      Accés obert
      El projecte es desenvolupa en el marc de la titulació oficial de màster MERIT del Departament de Teoria del Senyal i Comunicacions. El màster, orientat a la recerca i integrat dins del programa Erasmus Mundus, presenta ...

    • Diagnóstico de antenas a partir de medidas en campo próximo cilíndrico 

      Jofre Roca, Lluís; Cardama Aznar, Ángel; Ferrando Bataller, Miquel (Universidad Politécnica de Madrid (UPM), 1988)
      Text en actes de congrés
      Accés obert
      The purpose of this study is to show the antenna imaging capabilities of a near field measurement system. From the antenna near field data, the aperture field is reconstructed in the first instance, and then the source ...

    • Diagnóstico de arrays. Estudio comparativo entre campo próximo rectangular y cilíndrico 

      Blanch Boris, Sebastián; Romeu Robert, Jordi; Jofre Roca, Lluís (Unión Científica Internacional de Radio (URSI), 1990)
      Text en actes de congrés
      Accés obert

    • Dielectric flat lenses with cylindrically distributed parameters for millimeter-wave applications 

      Imbert, M.; Romeu Robert, Jordi; Jofre Roca, Lluís (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 dielectric flat lens with the effective relative permittivity cylindrically distributed is presented. In order to achieve high-data rate wireless communications for ...

    • Direct connection of uni-traveling-carrier photodiodes to antennas for frequency reconfigurable fiber-radio transmission in the Ka band 

      Vega Piña, Sara; Ballesteros Sánchez, Christian; Caillaud, Christophe; Lanteri, Delphine; Mekhazni, Karim; Santos Blanco, M. Concepción; Pradell i Cara, Lluís; Jofre Roca, Lluís (2024-07-01)
      Article
      Accés obert
      A compact photonically-driven wireless emitter based on a Uni-Traveling-Carrier photodiode (UTC-PD) which directly connects to a short asymmetrical inductive dipole (SAID) antenna is presented. The design exploits the ...

    • Diseño de bocinas ridge conformadas usando el metodo incremental 

      Blanch Boris, Sebastián; Jofre Roca, Lluís (Universidad de Málaga, 1992)
      Text en actes de congrés
      Accés obert

    • Diseño de un alimentador primario para dos frecuencias y dos polarizaciones 

      Ferrando Bataller, Miquel; Jofre Roca, Lluís (Universidad Politécnica de Madrid (UPM), 1988)
      Text en actes de congrés
      Accés obert
      Primary feeds have been designed to operate simultaneously in two frecuency bands and two cross-polarizations. The multimode generalized scattering matrix has been used to characterize the circular waveguide discontinuity. ...

    • Diseño del módulo emisor-receptor para un prototipo clínico de tomógrafo de microondas 

      Torres Viñals, Jordi; Broquetas Ibars, Antoni; Jofre Roca, Lluís (1991)
      Text en actes de congrés
      Accés obert
      This paper presents the design of an emitter-receiver system for a clinical microwave tomographic scanner prototype. A new design has been considered to reduce the problems of a prior experimental prototype in the department, ...

    • Diseño interactivo de formas de baja detectabilidad radar 

      Rius Casals, Juan Manuel; Jofre Roca, Lluís; Vall-Llossera Ferran, Mercedes Magdalena (1991)
      Text en actes de congrés
      Accés obert
      Radar cross section (RCS) of complex targets can be obtained in real time using the hardware capabilities of a high performance graphic workstation. Target geometry is modelled by a computer-aided design package. First ...

    • Diseño optimizado de agrupaciones de antenas planas 

      Clavera, Jordi; Jiménez, Jesús; Romeu Robert, Jordi; Blanch Boris, Sebastián; Jofre Roca, Lluís (Unión Científica Internacional de Radio (URSI), 1990)
      Text en actes de congrés
      Accés obert

    • Diseño y construcción de un sistema compact range reducido hasta 40 ghz 

      Xarrié, Jaume; Broquetas Ibars, Antoni; Jofre Roca, Lluís; Cardama Aznar, Ángel (Unión Científica Internacional de Radio (URSI), 1990)
      Text en actes de congrés
      Accés obert
      The design of a polarimetric Compact Range system covering 12-40 GHz is presented. Includes a preliminar error analysis, feeder design, and plane wave evaluation.

    • Diseño y evaluación de un sistema de medida RCS 

      Blanch Boris, Sebastián; Xarrié, Jaume; Broquetas Ibars, Antoni; Fabregas Canovas, Francisco Javier; Jofre Roca, Lluís (Unión Científica Internacional de Radio (URSI), 1990)
      Text en actes de congrés
      Accés obert
      A polarimetric compact range RCS measurement system covering 8 to 40 GHZ is presented. The sensitivity is evaluated both theoretically and experimentally. Some RCS and ISAR results are included.

    • Efecto de errores aleatorios en las medidas en campo próximo en coordenadas cilíndricas 

      Romeu Robert, Jordi; Jofre Roca, Lluís (1991)
      Text en actes de congrés
      Accés obert
      The far field noise due to a random near field noise is an stochastic process, and it will be shown that for a white gaussian space stationary near field noise, the far field noise is a gaussian non-stationary in elevation ...

    • Effect of random errors in antenna cylindrical near-field measurements 

      Romeu Robert, Jordi; Jofre Roca, Lluís (Institution of Electrical Engineers, 1991-02)
      Article
      Accés obert
      A closed expression for the autocorrelation of the far field noise due to random near field noise in a cylindrical near to far field transformation is derived. This expression is employed to obtain bounds for the computed ...

    • Effect of random errors in cylindrical 

      Romeu Robert, Jordi; Jofre Roca, Lluís (. 1991 IEEE AP-S INTERNATIONAL SYMPOSIUM, 1991)
      Text en actes de congrés
      Accés obert
      Expressions have been derived previously to predict the effect of random errors in planar near-field measurements. Similar equations for cylindrical near-field measurements are not available. Random errors are due to A/D ...

    • Efficient parametric characterization of the dynamic performance of an RFID IC 

      Capdevila Cascante, Santiago; Jofre Roca, Lluís; Romeu Robert, Jordi; Bolomey, J.Ch (2012)
      Article
      Accés restringit per política de l'editorial
      In this letter, a measurement technique for a complete parametric characterization of the input impedance of an RFID IC is presented. The use of an SPDT switch to modulate the signal from the network analyzer provides ...

    • El "Espacio Innovador" y la red 

      Jofre Roca, Lluís; Solé Parellada, Francesc; Sabaté i Garriga, Ferran; Berenguer Sau, Jordi; Marqués Acosta, Fernando; Romeu Robert, Jordi; Torres Viñals, Jordi (Cátedra Telefónica-UPC, 2005-11)
      Llibre
      Accés obert

    • El 'Espacio Profesional' y la red, más allá del 2005 

      Jofre Roca, Lluís; Solé Parellada, Francesc; Sabaté i Garriga, Ferran; Ezquerra, Norberto; Romeu Robert, Jordi; Torres Viñals, Jordi (Càtedra Telefónica-UPC: Especialización Tecnológica y Sociedad del Conocimiento, 2003-08)
      Llibre
      Accés obert