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Ara es mostren els items 41-60 de 258

    • Análisis y medida en campo próximo de antenas parabólicas 

      Jofre Roca, Lluís; Ferrando Bataller, Miquel (Consejo Superior de Investigaciones Científicas (CSIC), 1986)
      Text en actes de congrés
      Accés obert
      A complet process of design and measurement of parabolic antennas, is presented. We have implemented a set of programs in order to design and analyze the different geometries of parabolic reflectors. The measurements are ...

    • Antenas 

      Cardama Aznar, Ángel; Jofre Roca, Lluís; Rius Casals, Juan Manuel; Romeu Robert, Jordi; Blanch Boris, Sebastián; Ferrando Bataller, Miguel (Edicions UPC, 2002)
      Llibre
      Accés restringit als usuaris de la UB, UAB, UPC, UPF, UdG, UdL, URV, UOC, BC, UVic, UJI, URL, UIC
      En este libro se presentan los métodos fundamentales de análisis de antenas con un nivel de detalle que permite comprender sus principios de funcionamiento y conocer los parámetros de diseño que son de interés práctico. ...

    • Antenas para radio y TV. Principios de funcionamiento y características técnicas 

      Cardama Aznar, Ángel; Jofre Roca, Lluís (1980-09)
      Article
      Accés restringit per política de l'editorial
      Existe una gran variedad de antenas utilizadas satisfactoriamente como transmisoras y receptoras y aunque en cada banda de frecuencias existe una gran especialización de los tipos empleados, todas ellas operan sobre ...

    • Antenna input impedance measurement using multi-load MST 

      Romeu Robert, Jordi; Capdevila Cascante, Santiago; Bolomey, Jean Charles; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper presents the practical use of modulated scatterer technique (MST) for the measurement of the antenna input impedance using a multi-load automatic switching device, and it also includes the analysis of the ...

    • Antenna packaging for in-body applications 

      Romeu Robert, Jordi; González López, Giselle; Blanch Boris, Sebastián; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Text en actes de congrés
      Accés obert
      A cylindrical mode expansion of the fields produced by an embedded antenna is used to determine the dimensions of the antenna packaging in order to minimize antenna impedance changes when the antenna is immersed in a varying ...

    • Antenna reconfigurability based on a novel parasitic pixel layer 

      Rodrigo López, Daniel; Damgaci, Yasin; Unlu, M.; Cetiner, Bedri Artug; Romeu Robert, Jordi; Jofre Roca, Lluís (2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A novel reconfiguration method based in the use of pixel surfaces as parasitic elements is presented. This concept can be used to provide reconfigurability to a wide variety of non-reconfigurable antennas without requiring ...

    • Aprendizaje y asistencia virtual en red 

      Fuentes Fort, Maria; González Bermúdez, Meritxell; Guardiola Garcia, Marta; Jofre Roca, Lluís; Romeu Robert, Jordi; Vallverdú Bayés, Sisco (2011-01-20)
      Report de recerca
      Accés obert
      Favorecer el uso de las Tecnologías de Información y la Comunicación (TIC) en entornos educativos puede abarcar varios aspectos del proceso de aprendizaje. La incorporación de TICs en las aulas contribuye, por un lado a ...

    • Aprendizaje y asistencia virtual en red /Aprenentatge i assistència virtual en xarxa 

      Jofre Roca, Lluís; Romeu Robert, Jordi; Vallverdú Bayés, Sisco; Fuentes Fort, Maria; Guardiola Garcia, Marta (Universitat Politècnica de Catalunya. Càtedra Telefónica-UPC, 2011-01)
      Llibre
      Accés obert

    • Aprendizaje y asistencia virtual en red : la prueba Piloto : Cátedra Telefófica UPC : Análisis de le evolución y tendencias futuras de la sociedad de la información 

      Fuentes Fort, Maria; González Bermúdez, Meritxell; Guardiola Garcia, Marta; Jofre Roca, Lluís; Romeu Robert, Jordi; Vallverdú Bayés, Sisco (2011-07-29)
      Report de recerca
      Accés obert
      Hemos llevado a cabo una prueba piloto, demostradora del uso de las tecnologías del lenguaje y el habla aplicadas al aprendizaje de inglés. En general, se espera que la actividad acerque al alumno el máximo posible a la ...

    • Assessment of LTCC-based dielectric flat lens antennas and switched-beam arrays for future 5G millimeter-wave communication systems 

      Imbert Villà, Marc; Romeu Robert, Jordi; Baquero Escudero, M.; Martinez Ingles, Maria Teresa; Molina-Garcia Pardo, Jose Maria; Jofre Roca, Lluís (2017-10-30)
      Article
      Accés obert
      IEEE This paper presents design, LTCC fabrication, and full experimental verification of novel dielectric flat lens antennas for future high data rate 5G wireless communication systems in the 60 GHz band. We introduce and ...

    • Assessment of mmwave handset arrays in the presence of the user body 

      Ballesteros Sánchez, Christian; Vähä-Savo, Lauri; Haneda, Katsuyuki; Icheln, Clemens; Romeu Robert, Jordi; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2021-01-01)
      Article
      Accés obert
      The emergence of mobile terminals operating at millimeter-wave frequencies necessitates the ability to evaluate the effect the environment, and in particular, users have on their radiation properties. Some studies evaluated ...

    • Beam management for vehicle-to-vehicle (V2V) communications in millimeter wave 5G 

      Montero Bayo, Luca; Ballesteros Sánchez, Christian; De Marco, Cesar; Jofre Roca, Lluís (2022-04)
      Article
      Accés obert
      Cooperative, Connected and Automated Mobility (CCAM) is expected to leverage the full potential of wireless communications. With the growing adoption of 5G and its support for Vehicle-to-Everything (V2X) communications, ...

    • Beamforming antennas for 60 GHz positioning systems 

      Toda, Annapapió; Romeu Robert, Jordi; Jofre Roca, Lluís; 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 we analyze the benefit of using phased arrays as the receiving antennas of indoor location systems. A 60 GHz code division multiple access carrier-based ultra-wide band positioning system for the simultaneous ...

    • Bidimensional scattering of tm and te polarized waves by dielectric 

      Mallorquí Franquet, Jordi Joan; Vaquer Bonnin, Miguel; Cardama Aznar, Ángel; Jofre Roca, Lluís (EUROPEAN MICROWAVE CONFERENCE MANAGEMENT COMMITEE REED EXHIBITION COMPANIES, 1993)
      Text en actes de congrés
      Accés obert
      In the study of electromagnetic radiation effects over dielectric bodies, effective numerical methods are needed. At present, there is a lack of tools for measuring this effects and due to the huge growth of microwave ...

    • Broadband conductivity of graphene from DC to THz 

      Rouhi, N.; Jain, D.; Capdevila Cascante, Santiago; Jofre Roca, Lluís; Brown, E.; Burke, P.J. (IEEE Press. Institute of Electrical and Electronics Engineers, 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper for the first time we have studied the broadband sheet conductance of few-layer graphene on single-crystal quartz substrate. Few-layer graphene was grown on Nickel coated Si wafers and transferred to the ...

    • Calibración polarimetrica de un campo compacto de medida RCS 

      Broquetas Ibars, Antoni; Jofre Roca, Lluís (1991)
      Text en actes de congrés
      Accés obert
      A polarimetric calibrarion procedure for a compact range RCS measurement system is presented. This merhod is based on a marhematical model which includes al! possible errors. Some RCS measurements and ISAR images are included.

    • Caracterisation d'un systeme experimental pour la mesure a champ proche 

      Jofre Roca, Lluís; Cardama Aznar, Ángel (1981)
      Text en actes de congrés
      Accés obert
      Pendant les dernières années on a suscité un fort intérêt pour la mesure de la distribution des champs dans la zone proche des ouvertures, ainsi que pour son utilisation dans l'obtention des caractéristiques de rayonnement ...

    • Caracterización electromagnética de materiales RAM mediante medidas en espacio libre 

      Blanch Boris, Sebastián; Cardama Aznar, Ángel; Jofre Roca, Lluís (1991)
      Text en actes de congrés
      Accés obert
      A free-space measurement system in the 2-JBGHz frequency range is used to measure the reflection and transmission coefficients of planar samples. The complex electric permittivity and the magnetic permeability are calculated ...

    • Cálculo del campo difractado por objetos cilíndricos metálicos o multidieléctricos al incidir sobre ellos una onda 

      Ferrando Bataller, Miquel; Jofre Roca, Lluís (Consejo Superior de Investigaciones Científicas (CSIC), 1986)
      Text en actes de congrés
      Accés obert
      A method is described for calculating the scattered fields from conducting bodies and concentric multilayered cylinders, when they are illuminated by a wave with no z-axis variation. The method is based upon descomposition ...

    • Characterization of a 94 GHz radiometric imager with mechanical beam-scanning 

      Nova, Enrique; Abril, Jordi; Romeu Robert, Jordi; Broquetas Ibars, Antoni; Torres Torres, Francisco; Jofre Roca, Lluís (IEEE, 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper presents the characterization in terms of spatial resolution and radiometric sensitivity of a W-band Total Power Radiometer (TPR). The TPR is based on a heterodyne receiver with 64 dB of gain and 6.5 dB of noise ...