Ara es mostren els items 116-135 de 254

    • High impedance monopole antenna for indoor terahertz communication system 

      Yazgan, Ayhan; Romeu Robert, Jordi; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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      In this study, a wideband terahertz antenna for indoor wireless communication systems is proposed. Antenna has high input impedance which is reasonable for terahertz systems due to the high output impedance of terahertz ...
    • High-frequency RCS of complex radar targets in real time 

      Rius Casals, Juan Manuel; Ferrando Bataller, Miguel; Jofre Roca, Lluís (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1993-09-01)
      Article
      Accés obert
      This paper presents a new and original approach for computing the high-frequency radar cross section (RCS) of complex radar targets in real time with a 3-D graphics workstation. The aircraft is modeled with I-DEAS solid ...
    • Hybrid massive MIMO for urban V2I: Sub-6 GHz vs mmWave performance assessment 

      Pfadler, Andreas; Ballesteros Sánchez, Christian; Romeu Robert, Jordi; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2020-03)
      Article
      Accés obert
      The relevance of vehicle communications in next-generation networks entails the necessity of studying their performance in the framework of upcoming massive architectures. In this regard, a study of the wireless channel ...
    • Identificación selectiva de centros de dispersion radar utilizando tecnicas ISAR 

      Fabregas Canovas, Francisco Javier; Broquetas Ibars, Antoni; Jofre Roca, Lluís (1991)
      Text en actes de congrés
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      This paper presents an ISAR technique which is able to identify the scattering mechanisms in the target structure wich are responsible of each significant lo be of the RCS vs. angle diagram. The technique is based on a ...
    • In-cabin 120 GHz radar system for functional human breathing monitoring in a 3D scenario 

      López Montero, María José; Aguasca Solé, Alberto; Romeu Robert, Jordi; Jofre Roca, Lluís (Íñigo Cuiñas Gómez, 2021)
      Text en actes de congrés
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      Driving is one of the activities that takes a significant part of a person’s time, that is why monitoring vital signs is useful for the wellness of the occupants of the vehicle. One of the vital signs that provides more ...
    • In-cabin MIMO radar system for human dysfunctional breathing detection 

      López Montero, María José; Palacios Arias, César Augusto; Romeu Robert, Jordi; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2022-12-15)
      Article
      Accés obert
      The integration of wireless sensors into the automotive industry is making vehicles increasingly safe and autonomous. At present, vehicles are equipped with external sensors that facilitate maneuverability and braking and ...
    • Increased dynamic range for RFID EM-field measurements 

      Capdevila Cascante, Santiago; Romeu Robert, Jordi; Jofre Roca, Lluís; Bolomey, Jean Charles (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      This paper presents a new methodology to measure the electromagnetic (EM) field using RFID tags, overcoming the limitations in dynamic range arisen by the conventional excitation of RFID tags. The methodology consists in ...
    • Interference rejection using frequency and pattern reconfigurable antennas 

      Rodrigo López, Daniel; Romeu Robert, Jordi; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2012)
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      Interference rejection by taking advantage of the radiation pattern diversity of a reconfigurable antenna is considered. It is proposed to use simultaneously frequency and radiation reconfiguration to extend interference ...
    • Isofrequency-reconfigurable 8-bit RF repeater 

      Díaz Tapia, Edgar; Grau, Alfred; Rodriguez De Luis, Javier; de Flaviis, Franco; Jofre Roca, Lluís (2011-11-02)
      Article
      Accés restringit per política de l'editorial
      A novel isofrequency-reconfigurable RF repeater operating at 4.5 GHz is presented. The repeater uses a total of eight reconfigurable parasitic dipole elements to enhance and reconfigure the isolation level between the ...
    • 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)
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      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
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      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
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      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)
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      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)
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      Accés obert