Now showing items 1-8 of 8

  • 60GHz channel characterization using a Scatterer Mapping Technique 

    Papió, Anna; Grau, Alfred; Balcells Ventura, Jordi; Romeu Robert, Jordi; Jofre Roca, Lluís; Flaviis, Franco de (2010)
    Conference report
    Open Access
    In this paper, a Scatterer Mapping Technique based on a Multi-Frequency Bi-focusing operator with good imaging capabilities is used to characterize the 60GHz wireless channel in an office environment. The measurement data ...
  • Dual-band Butler matrix for WLAN systems 

    Collado Gómez, Juan Carlos; Grau Besolí, Alfred; Flaviis, Franco de (Institute of Electrical and Electronics Engineers, 2005)
    Conference report
    Open Access
    This paper shows the design of a dual-band Butler matrix aimed to cover the bands corresponding to the standards IEEE802.11a/b, with particular interest in WLAN systems, at the 2.4 GHz and 5 GHz bands. Measurements of the ...
  • Dual-band planar quadrature hybrid with enhanced bandwidth response 

    Collado Gómez, Juan Carlos; Grau Besolí, Alfred; Flaviis, Franco de (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-01-31)
    Article
    Open Access
    This paper presents the theory, design procedure, and implementation of a dual-band planar quadrature hybrid with enhanced bandwidth. The topology of the circuit is a three-branch-line (3-BL) quadrature hybrid, which ...
  • Microwave reflection tomographic array for damage detection of civil structures 

    Kim, Yoo Jin; Jofre Roca, Lluís; Flaviis, Franco de; Feng, Maria Q. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2003-11-30)
    Article
    Open Access
    Microwave tomographic imaging technology using a bifocusing operator has been developed in order to detect the internal voids/objects inside concrete structures. The imaging system consists of several cylindrical or ...
  • Miniature multi-element antenna for wireless communications 

    Jofre Roca, Lluís; Cetiner, Bedri Artug; Flaviis, Franco de (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2002-05-31)
    Article
    Open Access
    We present a novel broad-band miniature antenna and employ it in a multi-element geometry with diversity capabilities for wireless communications. This antenna (diameter < 0.2 λ and thickness < 0.06 λ) consists of two ...
  • Novel design methodology of matching networks based on the use of simmetry operators 

    Grau, Alfred; Romeu Robert, Jordi; Jofre Roca, Lluís; Flaviis, Franco de (IEEE Press. Institute of Electrical and Electronics Engineers, 2009-06)
    Conference report
    Open Access
  • Optimization of linear multielement antennas for selection combining by means of a Butler matrix in different MIMO environments 

    Grau Besolí, Alfred; Romeu Robert, Jordi; Blanch Boris, Sebastián; Jofre Roca, Lluís; Flaviis, Franco de (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-11-30)
    Article
    Open Access
    An optimized linear multielement antenna (MEA) is presented for selection combining schemes that improves the selection diversity gain and selection diversity capacity in medium and low multipath environments, with ...
  • Small-size broadband multi-element antenna for RF/wireless systems 

    Cetiner, Bedri Artug; Jofre Roca, Lluís; Qian, J. Y.; Flaviis, Franco de (IEEE, 2003-10-31)
    Article
    Open Access
    We present a small-size broadband antenna specifically designed for integration with RF/wireless communication systems. The antenna is built on a printed circuit board and fed by a coplanar waveguide (CPW) to allow further ...