Now showing items 136-155 of 160

    • SCATTMAT: a mode matching and generalized scattering matrix code for personal computers in a windows environment 

      Liberal, Antonio; Río Bocio, Carlos del Upna; Gonzalo García, Ramón Upna; Sorolla Ayza, Mario Upna (1997)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, a computer aided design tool is presented to simulate symmetrical radially deformed circular waveguide microwave components. This tool works with the well-known “Mode Matching and Scattering Matrix” ...
    • SCATTMAT: herramienta C.A.D. para el análisis de componentes en guía de onda circular con variaciones simétricas del radio 

      Liberal, Antonio; Lahera, Miguel; Río Bocio, Carlos del Upna; Gonzalo García, Ramón Upna; Sorolla Ayza, Mario Upna (1996)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, a C.A.D. tool to simulate simmetrical radial deformation microwave devices, using the modal analysis and scattering matrix techniques is presented. The code has been developed in C++ language, working with ...
    • Sculpting metals for anomalous transmission phenomena, complex waves and negative refractive metamaterials: underlying physics and applications 

      Navarro Cía, Miguel Upna (2011)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this talk, the potential of controlling the electromagnetic propagation by periodically-textured surfaces is reviewed. It is shown that backward-wave- and slow-wave-propagation, superluminal, effective negative ...
    • Sensing in coin discriminators 

      Carlosena García, Alfonso Upna; López Martín, Antonio Upna; Arizti, Fernando; Martínez de Guereñu, Ane; Pina Insausti, José L.; García Sayés, Miguel (IEEE, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      This paper describes the technologies used in coin discriminator devices, stressing the improvements and novel mechanisms introduced by the authors in the past few years as a result of the cooperation with one leading ...
    • Simplified Brillouin sensor for structural health monitoring applications based on passive optical filtering 

      Iribas Pardo, Haritz Upna; Urricelqui Polvorinos, Javier Upna; Mariñelarena Ollacarizqueta, Jon Upna; Sagüés García, Mikel Upna; Loayssa Lara, Alayn Upna (SPIE, 2015)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      We present a simplified configuration for distributed Brillouin optical time domain analysis sensors. The technique is based on passive optical filtering of the spectral components generated in an RF-pulse-modulated optical ...
    • Simultaneous and quasi-independent strain and temperature sensor based on microstructured optical fiber 

      López Aldaba, Aitor Upna; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe; López-Amo Sáinz, Manuel Upna (SPIE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, a new sensor system for simultaneous and quasi-independent strain and temperature measurements is presented. The interrogation of the sensing head has been carried out by monitoring the FFT phase variations ...
    • Simultaneous temperature and vibration monitoring using an all-PM fiber loop mirror interferometer 

      Leandro González, Daniel Upna; López-Amo Sáinz, Manuel Upna (SPIE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work, an all-polarization maintaining fiber loop mirror interferometer is presented and validated as vibration and temperature sensor without crosstalk between measurands. The system is entirely built using ...
    • SnO2-MOF-Fabry-Pérot humidity optical sensor system based on Fast Fourier transform technique 

      López Aldaba, Aitor Upna; López Torres, Diego Upna; Ascorbe Muruzabal, Joaquín Upna; Rota Rodrigo, Sergio Upna; Elosúa Aguado, César Upna; López-Amo Sáinz, Manuel Upna; Arregui San Martín, Francisco Javier Upna; Corres Sanz, Jesús María Upna; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe (SPIE, 2016)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, a new sensor system for relative humidity measurements based on a SnO2 sputtering deposition on a microstructured optical fiber (MOF) low-finesse Fabry-Pérot (FP) sensing head is presented and characterized. ...
    • Sources of noise in Brillouin optical time-domain analyzers 

      Urricelqui Polvorinos, Javier Upna; Soto, Marcelo A.; Thévenaz, Luc (SPIE, 2015)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      This paper presents a thorough study of the different sources of noise affecting Brillouin optical time-domain analyzers (BOTDA), providing a deep insight into the understanding of the fundamental limitations of this kind ...
    • Study of the human eye working principle: an impressive high angular resolution system with simple array detectors 

      Betancourt Quiñones, Diego Upna; Río Bocio, Carlos del Upna (IEEE, 2006)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper the working principle of the human eye is studied since uses very simple detectors, cones and rods, to provide an impressive high angular resolution without using any kind of scanning technique. Usually ...
    • Sub-millimetre wave imaging array configurations using EBG technology 

      Ederra Urzainqui, Íñigo Upna; Gonzalo García, Ramón Upna; Martínez Pascual, Beatriz Upna; Río Bocio, Carlos del Upna; Azcona, L.; Alderman, B.; Huggard, P.G.; Hon, B.P. de; Beurden, M.C. van; Marchand, L.; Maagt, Peter de (2004)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    • Suberb gaussian beam efficiency corrugated horn antennas 

      Teniente Vallinas, Jorge Upna; Gonzalo García, Ramón Upna; Río Bocio, Carlos del Upna (2010)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper we are presenting the possibilities of corrugated horn antennas that combine horizontal and vertical corrugations.
    • Synthesis of virtual Brillouin frequency shift profiles in BOTDA sensors using optical source dithering 

      Urricelqui Polvorinos, Javier Upna; Sagüés García, Mikel Upna; Loayssa Lara, Alayn Upna (SPIE, 2014)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      We demonstrate a novel concept for Brillouin optical time domain analysis sensors that is based on synthesizing a virtual Brillouin frequency shift profile along the sensing fiber. The technique is based on modulating the ...
    • Technical specifications and quality control procedures for reducing the uncertainty in PV installations: results of the FP7 project PVCROPS 

      Martínez Moreno, Francisco; Lorenzo Pigueiras, Eduardo; Narvarte Fernández, Luis; Moretón Villagra, Rodrigo; Tyutyundzhiev, Nicolay; Parra Laita, Íñigo de la Upna (EU PVSEC, 2015)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      PVCROPS (PhotoVoltaic Cost r€duction, Reliability, Operational performance, Prediction and Simulation) is a project within the European Framework Programme 7 whose objectives are: improving the performance, reliability ...
    • Title enhancement of the sensitivity of a volatile organic compounds MOF-sensor by means of its structure 

      López Torres, Diego Upna; López Aldaba, Aitor Upna; Elosúa Aguado, César Upna; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe; López-Amo Sáinz, Manuel Upna; Arregui San Martín, Francisco Javier Upna (MDPI, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, we experimentally compare several core structures of Microstructured Optical Fibers (MOFs) for low-finesse Fabry-Pérot (FP) sensors. These sensors are designed for Volatile Organic Compounds (VOCs) measurements. ...
    • Tools for the high penetration of PV systems in the EU electrical networks: results of PVCROPS Project 

      Narvarte Fernández, Luis; Marroyo Palomo, Luis Upna; Collares Pereira, Manuel; Tyutyundzhiev, Nicolay; Conlon, Michael; Bouzzan, N.; Guelbenzu Michelena, Eugenio; González, R.; Desportes, Adrien; Simmonds, Gary; Wilkin, Benjamin (EU PVSEC, 2015)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The Solar Energy Industrial Initiative established the objective of integrating PV into the grid to provide up to 12% of the EU electricity demand. The FP7 project PVCROPS has developed solutions to allow the high penetration ...
    • Transición coaxial a guía doble ridge cargada 

      Cantora Álvarez, Pablo; Río Bocio, Carlos del Upna; Teniente Vallinas, Jorge Upna (2005)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper a new method to design a transition from coaxial waveguide to a loaded double ridge waveguide is proposed. This method allows the use of the large frequency bandwidth ridge waveguides present. In the ...
    • Two methods for nonparametric spectrum peak discrimination 

      Zivanovic, Miroslav Upna; Carlosena García, Alfonso Upna (2002)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The conventional DFT-oriented nonparametric interpolation methods, based on time windowing and the DTFT envelope curve resampling (zero padding, Chirp-z [1], frequency scale distortion [2], etc.), can improve the spectrum ...
    • Ubiquitous connected train based on train-to-ground and intra-wagon communications capable of providing on trip customized digital services for passengers 

      Salaberria, Itziar; Perallos Ruiz, Asier; Azpilicueta Fernández de las Heras, Leyre Upna; Falcone Lanas, Francisco Javier Upna; Carballedo, Roberto; Angulo Martínez, Ignacio; Elejoste Larrucea, Pilar; Bahillo, Alfonso; Astrain Escola, José Javier Upna; Villadangos Alonso, Jesús Upna (MDPI, 2014)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      During the last years, the application of different wireless technologies has been explored in order to enable Internet connectivity from vehicles. In addition, the widespread adoption of smartphones by citizens represents ...
    • Ultra-wide band corrugated gaussian profiled horn antenna design 

      Teniente Vallinas, Jorge Upna; Gonzalo García, Ramón Upna; Río Bocio, Carlos del Upna (IEEE, 2001)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A corrugated horn antenna design with more than 40% bandwidth is proposed in this paper. The measured radiated field patterns have a good agreement with the simulated ones. This antenna can be used in applications that ...