Ara es mostren els items 1-20 de 313

  • 100 GHz MST retina for real time near field imaging 

    Garg, Vaibhav (Universitat Politècnica de Catalunya, 2012-06-26)
    Projecte Final de Màster Oficial
    Accés obert
    [ANGLÈS] For an imaging system, a good compromise is needed between the resolution of the image and the penetration ability of the electromagnetic wave. In order to obtain a good resolution, a high frequency system is ...
  • 100 GHz retina for THz tomographic imaging 

    Alonso, Maria; Guerra, C.; Nova, Enrique; Abril, Jordi; Romeu Robert, Jordi; Llombart, Nuria; Jofre Roca, Lluís (2011)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    In a tomographic imaging system, the key is to collect a sufficient number of scattered field points to recover the currents in the inverse scattering problem. This can be accomplished by using a real array of multiplexed ...
  • 3D arrayed microwave tomographic system for medical imaging 

    Guardiola Garcia, Marta; Jofre Roca, Lluís; Gedda, F.; Capdevila Cascante, Santiago; Romeu Robert, Jordi; Blanch Boris, Sebastián (2010)
    Text en actes de congrés
    Accés obert
    In this paper, a combined tomographic imaging system comprising the rotation of a multiplexed linear antenna array around the object under test is designed. With this system a cylindrical sampling is obtained, allowing to ...
  • 3D UWB magnitude-combined tomographic imaging for biomedical applications. Algorithm validation 

    Guardiola Garcia, Marta; Jofre Roca, Lluís; Capdevila Cascante, Santiago; Blanch Boris, Sebastián; Romeu Robert, Jordi (2011-06)
    Article
    Accés obert
    Biomedical microwave imaging is a topic of continuous research for its potential in different areas especially in breast cancer detection. In this paper, 3D UWB Magnitude-Combined tomographic algorithm is assessed for ...
  • Accelerated direct solution of the method-of-moments linear system 

    Heldring, Alexander; Tamayo, J.M.; Úbeda Farré, Eduard; Rius Casals, Juan Manuel (2012-08)
    Article
    Accés restringit per política de l'editorial
    This paper addresses the direct (noniterative) solution of the method-of-moments (MoM) linear system, accelerated through block-wise compression of the MoM impedance matrix. Efficient matrix block compression is achieved ...
  • Accelerated direct solution of the MoM linear system using block compression and nested factorization 

    Heldring, Alexander; Rius Casals, Juan Manuel (IEEE, 2011)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    A comparison is presented between different algorithms for direct (non-iterative) accelerated solution of the Method of Moments. The alternatives are common block LU factorization and Compressed Block Decomposition (CBD), ...
  • A combined spectral-parabolic equation approach for propagation prediction in tunnels 

    Izquierdo Fernandez, Benjamin; Alonso, Javier; Capdevila Cascante, Santiago; Romeu Robert, Jordi (2010)
    Text en actes de congrés
    Accés obert
    Several techniques can be used to study electromagnetic propagation in tunnels. A combination of two of such techniques is presented in this paper to model propagation inside a rectangular tunnel. They are combined in ...
  • A communication-based algorithm to avoid the human body effect on antennas 

    Martínez García, Javier (Universitat Politècnica de Catalunya, 2011-07-21)
    Projecte/Treball Final de Carrera
    Accés obert
    English: The aim of this project is to design and implement a simple and reliable system able to minimize the negative effect that users cause on the antenna performance of mobile devices when interacting with these. The ...
  • A compact dual-band planar monopole antenna using fractal rings and A Y-shaped feeding transmission line 

    Djafri, Kahina; Challal, Mouloud; Romeu Robert, Jordi (De Gruytr, 2018-01-01)
    Article
    Accés restringit per política de l'editorial
    This paper presents a novel design approach of a compact dual-band monopole antenna with an overall size of 18.9x13x1.6mm3. The proposed antenna is composed of a fractal ring shaped patch fed by a Y-shaped transmission ...
  • A contact-less small antenna characterization through impedance modulation 

    Monsalve Carcelen, Beatriz; Blanch Boris, Sebastián; Romeu Robert, Jordi; Jofre Roca, Lluís (IEEE Press. Institute of Electrical and Electronics Engineers, 2009)
    Text en actes de congrés
    Accés obert
    In smalls antennas S-parameters measurements are highly influenced by the measurement equipment as well as the environment. In order to avoid this inconvenience, a wireless and non-invasive characterization setup is required. ...
  • Advances in antenna technology for wireless handheld devices 

    Anguera Pros, Jaume; Andújar Linares, Aurora; Huynh, Minh-Chau; Orlenius, Charlie; Picher, Cristina; Puente Baliarda, Carles (2013)
    Article
    Accés obert
    The constant evolution of wireless handheld devices together with the apparition of multiple wireless communication systems fosters the antenna community to design new radiating and measurements systems capable of satisfying ...
  • A figure-of-merit for pattern reconfigurable antennas 

    Rodrigo López, Daniel; Romeu Robert, Jordi; Capdevila Cascante, Santiago; Jofre Roca, Lluís (2013-03)
    Article
    Accés restringit per política de l'editorial
    The performance of pattern reconfigurable antennas is evaluated with the purpose of deriving a figure-of-merit for pattern reconfigurability. A general formulation is provided for the average gain achieved by a ...
  • A figure of merit to assess the performance of photoconductive antennas at terahertz band 

    Romeu Robert, Jordi; Cea Falcó, Marc de; Jofre Roca, Lluís; Yazgan, Ahmet Utku (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Photoconductive antennas are one of the most efficient ways to radiate and receive EM waves around the 1 THz frequency band. The physical processes involved in photoconductive terahertz signal generation are complex enough ...
  • A frequency reconfigurable cell for beam-scanning reflectarrays 

    Rodrigo López, Daniel; Jofre Roca, Lluís; Perruisseau Carrier, Julien (Institute of Electrical and Electronics Engineers (IEEE), 2013)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Reflectarray antennas are excellent candidates for beam-scanning applications thanks to their low loss, light and quasi-planar structure and ease of electronic control. However, reflectarray antennas suffer from narrower ...
  • A graphene based plasmonic antenna design for communication in the THz regime 

    Suessmeier, Christoph; Schaeffer, Stephan; Abadal Cavallé, Sergi; Alarcón Cot, Eduardo José; Hosseininejad, Seyed Ehsan; Wigger, Anna K.; Stock, Daniel; Wagner, Stefan; Cabellos Aparicio, Alberto; Lemme, Max; Bolívar, Peter Haring (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Comunicació de congrés
    Accés restringit per política de l'editorial
    We show the first THz emission of a graphene based plasmonic antenna structure. Furthermore we present the minimum material requirements for an operational graphene antenna in terms of chemical potential µc and relaxation time t.
  • Agrupación submuestreada operando en modo fractón utilizando antenas microstrip inspiradas en el fractal de Sierpinski 

    Anguera Pros, Jaume; Montesinos, Gemma; Puente Baliarda, Carles; Borja, C.; Soler, Jordi (Unión Científica Internacional de Radio (URSI), 2003)
    Text en actes de congrés
    Accés obert
    A high-directivity microstrip array using mul- tilevel elements based on a fractal geometry is theoretically compared with one using a circular patches. Within the same electrical area, the same directivity can be ...
  • A high-resolution UWB IR superregenerative receiver front end with an SRD quench shaper 

    Moncunill Geniz, Francesc Xavier; Bonet Dalmau, Jordi; Palà Schönwälder, Pere; Águila López, Francisco del; Giralt Mas, Ma. Rosa (2012-02-03)
    Article
    Accés restringit per política de l'editorial
    We present a simple receiver front end that makes use of the baseband superregeneration principle to detect ultrawideband (UWB) impulse radio signals. The UWB antenna is directly connected to the core circuit consisting ...
  • A Ku band circularly polarized 2×2 microstrip antenna array for remote sensing applications 

    Ferré, Roger; Mira, Fermín; Luzi, Guido; Mateu Mateu, Jordi; Kalialakis, C. (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    This paper reports the development of a Circularly Polarized (CP) microstrip patch array working at Ku band and in particular between 16.9-17.2GHz for remote sensing applications. The design is based on a sequential ...
  • Alineament d'interferències, gestió d'interferències i diversitat de polarització 

    Gurrera Edo, Aniol (Universitat Politècnica de Catalunya, 2015-03-19)
    Projecte/Treball Final de Carrera
    Accés obert
    [ANGLÈS] This project deals with the interference management in multiuser environments through the K-User MxN MIMO Interference Channel (IC)
  • A low-complexity method for antenna selection in spatial modulation systems 

    Ntontin, Konstantinos; Di Renzo, Marco; Pérez Neira, Ana Isabel; Verikoukis, Christos (2013-11-13)
    Article
    Accés restringit per política de l'editorial
    In this Letter, a low-complexity Euclidean distancebased method for antenna subset selection in Spatial Modulation systems is presented. The proposed method avoids the high complexity of both the optimal exhaustive ...