Ara es mostren els items 1-20 de 39

    • A 3D printed lens antenna for 5G applications 

      Ballesteros, Christian; Maestre, Marcos; Santos Blanco, M. Concepción; Romeu Robert, Jordi; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Comunicació de congrés
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      A switchable multi-antenna architecture for lens-assisted beamsteering in the Ka-band region allocated for 5G communications (24-30 GHz) is proposed. The radiating elements are bow-tie antennas mounted with a 3D printed ...
    • A model for photocurrent generation in photoconductive antennas 

      López Menchón, Héctor; Revuelta Martinez, Sergio; Santos Blanco, M. Concepción; Romeu Robert, Jordi; Rius Casals, Juan Manuel (2019)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The laser-induced current carrier generation and transport under large biasing voltages in photoconductive materials located in electrode gap region of photoconductive antennas is a complex process involving many different ...
    • A study of flexible bandwidth allocation in statistical OFDM-based PON 

      Cano Valadéz, Iván Nicolás; Escayola Elias, Francisco Javier; Peralta Gallardo, Ángel; Polo Querol, Víctor; Santos Blanco, M. Concepción; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      The upstream of an OFDM-PON with direct modulated lasers tuned in temperature was experimentally tested. Results demonstrate flexible bandwidth allocation, and show it constitutes an efficient strategy to cope with the ...
    • Alignment of terahertz transmission setups with free-space laser photoconductive switches 

      Nuño Gómez, Daniel-Juan; Vega Piña, Sara; Santos Blanco, M. Concepción (Institute of Electrical and Electronics Engineers (IEEE), 2022)
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      A systematic procedure for ensuring perfect alignment of Photoconductive Antennas (PCA) in transmittance measure setups with free-space laser PCA gap feeding and mechanical adjust of silicon substrate lenses is presented. ...
    • An architecture analysis for millimeter-wave optically steerable antenna array 

      Ballesteros Sánchez, Christian; Maestre, Marcos; Santos Blanco, M. Concepción; Romeu Robert, Jordi; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      A lens-based integrated photodiode-antenna array for a Radio over Fiber (RoF) 5G wireless base station at millimeter-wave frequencies is proposed and analyzed. The elements of the array are based on slot bow-tie antennas ...
    • An OFDMA-PON with non-preselected independent ONU sources and centralized feedback wavelength control: Dimensioning and experimental results 

      Cano Valadéz, Iván Nicolás; Santos Blanco, M. Concepción; Escayola Elias, Francisco Javier; Polo Querol, Víctor; Giacoumidis, E.; Kachris, C.; Tomkos, Ioannis; Prat Gomà, Josep Joan (IEEE, 2012)
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      A simple and low cost method for wavelength control based on centralized OLT monitoring and feedback of economical random non-preselected independent ONU sources is presented. The technique was dimensioned and experimentally ...
    • Bandgap widening in macroporous silicon photonic crystals by multiperiodic structures 

      Segura García, Daniel; Cardador Maza, David; Vega d'Aurelio, Davide; Santos Blanco, M. Concepción; Dios Otín, Víctor Federico; Rodríguez Martínez, Ángel (Institute of Physics (IOP), 2018-05-14)
      Article
      Accés obert
      Large bandgaps with low transmission in 3D macroporous silicon photonic crystals have been proved as an interesting technology for the development of optical filters and spectroscopic MIR gas sensors. The aim of this study ...
    • Bandwidth-length trade-off figures of merit for electro-optic traveling wave modulators 

      Ibarra Fusté, Jose Antonio; Santos Blanco, M. Concepción (2013-05)
      Article
      Accés obert
      Closed-form expressions explicitly relating modulation bandwidth and active length in electro-optic traveling wave modulators are presented which fully account for skin-effect electrode loss and optical-electrical wave ...
    • Characterization of THz radiation by collimated wavefront aperture raster scanning 

      Nuño Gómez, Daniel-Juan; Santos Blanco, M. Concepción; Gomez Diaz, J. Sebastian; Romeu Robert, Jordi; Jofre Roca, Lluís (Universidad de Málaga, 2020)
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      We present measurements for characterization of the beam profile and polarization pattern of lens-coupled photoconductive antennas (PCAs) at THz frequencies using a setup with antennas at fixed positions and a movable ...
    • Closed-form expressions for the optimization of high speed electro-optical modulators 

      Ibarra Fusté, Jose Antonio; Santos Blanco, M. Concepción (2013-07)
      Article
      Accés restringit per política de l'editorial
      Compact closed-form mathematical expressions for the propagation parameters (characteristic impedance, effective permittivity and attenuation) of coplanar waveguides (CPW) are presented. The formulas take into account ...
    • Compact closed-form expressions for the propagation parameters of a finite ground width coplanar transmission waveguide with thick electrodes 

      Ibarra Fusté, Jose Antonio; Santos Blanco, M. Concepción; Rodríguez Rodríguez, Enric (2012-02-21)
      Article
      Accés restringit per política de l'editorial
      Compact closed-form mathematical expressions are presented for the effective permittivity, characteristic impedance and attenuation constant of coplanar waveguides with thick electrodes and high-frequency dispersion. ...
    • Conmutacion totalmente optica de ondas guiadas en medios virefring. 

      Santos Blanco, M. Concepción; Pérez Torres, Juan; Torner Sabata, Lluís (1993)
      Text en actes de congrés
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      A new kind of tunable all-optical guided-wave thresholding device using waveguides consisting of both birefringent linear media and isotropic nonlinear media is discussed. The behavior of the lower threshold with a suitable ...
    • Differential link-loss compensation through dynamic bandwidth assignment in statistical OFDMA-PON 

      Cano Valadéz, Iván Nicolás; Peralta Gallardo, Ángel; Polo Querol, Víctor; Escayola Elias, Francisco Javier; Santos Blanco, M. Concepción; Prat Gomà, Josep Joan (2013)
      Text en actes de congrés
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      Flexible bandwidth allocation strategies in a statistical OFDM-PON are experimentally shown to compensate for differential link loss allowing for proper detection of ONUs separated up to 55km (11.4dB)
    • Dynamic Y-branched structures in quadratic nonlinear media 

      Santos Blanco, M. Concepción (ELSEVIER SCIENCE BV, 2000-06-30)
      Article
      Accés obert
      A selfsplitting of the beams entering a waveguide made of a quadratic nonlinear material is observed numerically. Relative π phase differences between harmonics as positively contributing to linear diffraction are shown ...
    • Experimental demonstration of a statistical OFDM-PON with multiband ONUs and elastic bandwidth allocation 

      Cano Valadéz, Iván Nicolás; Escayola Elias, Francisco Javier; Schindler, Philipp C.; Santos Blanco, M. Concepción; Polo Querol, Víctor; Leuthold, Juerg; Tomkos, Ioannis; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2015-01-01)
      Article
      Accés obert
      The statistical orthogonal frequency division multiplexing passive optical network (OFDM-PON) concept with multiband optical network units (ONUs) is experimentally tested with two users and an optical line terminal at 2.5/5 ...
    • Experimental demonstration of multi-band upstream in statistical OFDM-PONs and comparison with digital subcarrier assignment 

      Cano Valadéz, Iván Nicolás; Escayola Elias, Francisco Javier; Schindler, Philipp C.; Santos Blanco, M. Concepción; Polo Querol, Víctor; Leuthold, Juerg; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      A multiband subcarrier allocation scheme is demonstrated for the uplink in a statistical OFDM-PON. Performance achieved is similar to digital subcarrier allocation, with the significant advantage of a lower transmitter complexity.
    • Figure of merit for multiband antennas 

      Rius Casals, Juan Manuel; Santos Blanco, M. Concepción; Parrón Granados, Josep (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2003-11-30)
      Article
      Accés obert
      This communication defines a figure of merit for multiband antennas that gives an objective quantification of the similarities between radiation patterns at the different antenna operating bands.
    • General Equations for the Induced Phase Shift in Resonant Electro-Optic Modulators 

      Collado Gómez, Juan Carlos; Menéndez Nadal, Óscar; Santos Blanco, M. Concepción; Mateu Mateu, Jordi; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-02-28)
      Article
      Accés obert
      We derive general equations to calculate the electrooptically induced optical phase shift in resonantly enhanced modulators. The equations are useful in designing modulator electrodes with optimal length and optimal mismatch ...
    • Impact of bias field screening and dipole length in terahertz photoconductive antennas 

      Schönenberger, David; López Menchón, Héctor; Santos Blanco, M. Concepción; Rius Casals, Juan Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2022)
      Text en actes de congrés
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      A numerical approach for the modelling of dipole Photoconductive Antennas (PCAs) is presented, based on the classical Drude model with extension to include the bias field screening due to both the space charge and the THz ...
    • La fotònica revoluciona les telecomunicacions 

      Torner Sabata, Lluís; Pérez Torres, Juan; Artigas García, David; Santos Blanco, M. Concepción (1998-12)
      Article
      Accés obert