Ara es mostren els items 6-25 de 25

  • 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 ...
  • 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 ...
  • Enhancing RFID sensing capabilities: multi-load backscattering 

    Capdevila Cascante, Santiago; Jofre Roca, Lluís; Romeu Robert, Jordi; Bolomey, Jean Charles (2013)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    This conference paper presents some experimental results using the concept of an multi-loaded enhanced RFID tag capable of switching between different loads to fully determine the input impedance of the RFID tag antenna ...
  • 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)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    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 ...
  • Multiport multiband coupling minimization for miniature antennas 

    Serrano, Raquel; Capdevila Cascante, Santiago; Aguasca Solé, Alberto; Romeu Robert, Jordi; Jofre Roca, Lluís (2009)
    Text en actes de congrés
    Accés obert
    The equations governing the multiport multiband antennas are analyzed in this paper with the objective of drawing the design guidelines for low coupling small antennas. Those guidelines have been applied in the design and ...
  • Near Field RFID Sensing and Imaging 

    Jofre Roca, Lluís; Capdevila Cascante, Santiago; Romeu Robert, Jordi; Bolomey, J.Ch (2009)
    Text en actes de congrés
    Accés obert
    There is a growing need for designing small self-powered devices, able to sense and deliver accurate information on the eld distribution around or inside complex media for monitoring and imaging purposes. Industrial, ...
  • Optical signal processor for millimeter-wave interferometric radiometry 

    Nova Lavado, Enrique; Romeu Robert, Jordi; Capdevila Cascante, Santiago; Torres Torres, Francisco; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2014-05)
    Article
    Accés restringit per política de l'editorial
    In interferometric radiometry, the correlations between all pairs of radio-frequency (RF) receivers must be performed in order to obtain the scene visibilities. This represents a cumbersome problem in passive imaging where ...
  • Passive RFID based sensing 

    Capdevila Cascante, Santiago; Jofre Roca, Lluís; Romeu Robert, Jordi; Bolomey, J.Ch. (IEEE, 2011)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    The principle of communication of passive RFID, which relies on the Modulated Scattering Technique (MST) to transmit the information from the tag to the reader, opens a way to enable conventional RFID for sensing purposes, ...
  • Preliminar propagation and MIMO experiments in train tunnels at 5.8GHz 

    Alonso, Javier; Izquierdo Fernandez, Benjamin; Capdevila Cascante, Santiago; Romeu Robert, Jordi (IEEE Press. Institute of Electrical and Electronics Engineers, 2009)
    Text en actes de congrés
    Accés obert
    In this paper, a complete set-up to subway radio propagation measurement at L and C Band is presented. This set-up has been tested at a real subway tunnel with a special structural characteristics allowing propagation path ...
  • RFID array probe for EM-field measurements 

    Capdevila Cascante, Santiago; Jofre Roca, Lluís; Bolomey, J.Ch; Romeu Robert, Jordi (IEEE Press. Institute of Electrical and Electronics Engineers, 2009-06)
    Text en actes de congrés
    Accés obert
  • RFID array sensing 

    Capdevila Cascante, Santiago; Jofre Roca, Lluís; Romeu Robert, Jordi; Bolomey, J.Ch (2010)
    Text en actes de congrés
    Accés obert
    In this paper the use of RFID tags for the measurement of physical parameters in a distributed set of points is presented. Experimental results for two different scenarios are presented; the first uses a 2D RFID array to ...
  • RFID based probes for EM-field measurements 

    Capdevila Cascante, Santiago; Massud, Muhammad; Serrano, Raquel; Aguasca Solé, Alberto; Blanch Boris, Sebastián; Romeu Robert, Jordi; Bolomey, J.Ch; Jofre Roca, Lluís (IEEE Press. Institute of Electrical and Electronics Engineers, 2009)
    Text en actes de congrés
    Accés obert
    In this paper the use of RFID for EM field measurement is studied. A novel RFID antenna with high tuning capabilities is presented and measured, and it is used in combination with several RFID IC to measure the EM ...
  • RFID multiantenna systems for wireless communications and sensing 

    Capdevila Cascante, Santiago (Universitat Politècnica de Catalunya, 2013-02-15)
    Tesi
    Accés obert
    Many scientific, industrial and medical applications require the measurement of different physical parameters in order to collect information about the spatially distributed status of some process. Very often this information ...
  • Robust differential multi-frequency microwave imaging for breast cancer detection 

    Guardiola Garcia, Marta; Capdevila Cascante, Santiago; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2013)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Microwave imaging is a topic of continuous research for its potential in biomedical area and in particular for breast cancer detection. This paper presents a novel multi-frequency differential linearized (FDL) technique ...
  • Self-biased reconfigurable graphene stacks for terahertz plasmonics 

    Gomez Diaz, J. S.; Moldovan, C; Capdevila Cascante, Santiago; Romeu Robert, Jordi; Bernard, L. S.; Magrez, A; Ionescu, A. M.; Perruisseau Carrier, Julien (2015-03-01)
    Article
    Accés obert
    The gate-controllable complex conductivity of graphene offers unprecedented opportunities for reconfigurable plasmonics at terahertz and mid-infrared frequencies. However, the requirement of a gating electrode close to ...
  • Teraherz subsurface imaging system 

    Nova, Enrique; Abril, Jordi; Guardiola Garcia, Marta; Capdevila Cascante, Santiago; Broquetas Ibars, Antoni; Romeu Robert, Jordi; Jofre Roca, Lluís (2010)
    Text en actes de congrés
    Accés obert
    A subsurface imaging system based on a terahertz time-domain spectrometer (THz-TDS) is described in this paper. The system performance has been simulated in terms of spatial resolution, penetration capabilities and SNR. ...
  • The “challenging” world of Terahertz radiation and imaging 

    Jofre Roca, Lluís; Romeu Robert, Jordi; Capdevila Cascante, Santiago; Abril, Jordi; Nova, Enrique; Alonso, Maria (2011)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    THz propagation through materials may reveal unique macroscopic and physical properties of their internal structure without the damage associated with ionizing radiation. The generation, radiation, and detection of THz ...
  • Toward 3D UWB tomographie imaging system for breast tumor detection 

    Guardiola Garcia, Marta; Jofre Roca, Lluís; Capdevila Cascante, Santiago; Blanch Boris, Sebastián; Romeu Robert, Jordi (2010)
    Text en actes de congrés
    Accés obert
    A novel 3D tomographic algorithm for short range cylindrical geometries using UWB frequency range is presented. The algorithm has been applied to breast tumor detection, nevertheless, its non application-specific character ...
  • UWB High-contrast robust tomographic imaging for medical applications 

    Guardiola Garcia, Marta; Capdevila Cascante, Santiago; Blanch Boris, Sebastián; Romeu Robert, Jordi; Jofre Roca, Lluís (2009)
    Text en actes de congrés
    Accés obert
    In this paper a complete UWB Circular Tomographic System robust to high contrast or large objects, applied to Breast Tumor Detection, is presented. The main contribution of this paper is to focus on the implementation ...
  • UWB MST MEMS-based near-field imaging system 

    Capdevila Cascante, Santiago; Jofre Cruanyes, Marc; Rodríguez, J.; Guardiola Garcia, Marta; Papió, Anna; de Flaviis, Franco; Jofre Roca, Lluís (2008)
    Text en actes de congrés
    Accés obert
    In this paper a new family of illuminators and MST measurement architectures is presented and the di erent aspects are studied.