Envíos recientes

  • 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)   Congreso / Biltzarra  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 ...
  • Characterization of near-ground radio propagation channel for wireless sensor network with application in smart agriculture 

    Klaina, Hicham; Alejos, Ana; Aghzout, Otman; Falcone Lanas, Francisco Javier Upna (MDPI, 2017)   Congreso / Biltzarra  OpenAccess
    In this contribution, we present a narrowband radio channel model for a scenario wherein the radio link operates under near-ground conditions, occurring on a ZigBee wireless sensor networks applied to smart agriculture. ...
  • Broadband radar cross-section reduction using AMC technology 

    Iriarte Galarregui, Juan Carlos Upna; Tellechea Pereda, Amagoia; Martínez de Falcón, José Luis; Ederra Urzainqui, Íñigo Upna; Gonzalo García, Ramón Upna; Maagt, Peter de (IEEE, 2013)   Artículo / Artikulua  OpenAccess
    This paper presents the design, fabrication and characterization of a planar broadband chessboard structure to reduce the radar cross-section (RCS) of an object. The chessboard like configuration is formed by combining two ...
  • Evanescently fed electromagnetic band-gap horn antennas and arrays 

    Khromova, Irina Upna; Ederra Urzainqui, Íñigo Upna; Teniente Vallinas, Jorge Upna; Gonzalo García, Ramón Upna; Esselle, Karu P. (IEEE, 2012)   Artículo / Artikulua  OpenAccess
    The design of a horn antenna based on electromagnetic band-gap structures (EBGs) and fed by evanescent fields in the containing periodic structure is presented. Such all-dielectric antennas can form compact arrays and ...
  • Dual circularly polarized broadside beam metasurface antenna 

    Ederra Urzainqui, Íñigo Upna; Tellechea Pereda, Amagoia; Caminita, Francesco; Martini, Enrica; Iriarte Galarregui, Juan Carlos Upna; Gonzalo García, Ramón Upna; Maci, Stefano (IEEE, 2016)   Artículo / Artikulua  OpenAccess
    This paper presents the design of a modulated metasurface (MTS) antenna capable to provide both righthand (RH) and left-hand (LH) circularly polarized (CP) boresight radiation at Ku-band (13.5 GHz). This antenna is based ...
  • Superbackscattering antenna arrays 

    Liberal Olleta, Íñigo; Ederra Urzainqui, Íñigo Upna; Gonzalo García, Ramón Upna; Ziolkowski, Richard W. (IEEE, 2015)   Artículo / Artikulua  OpenAccess
    This article discusses the theory, design and practical implementation of superbackscattering antenna arrays. In analogy with Uzkov’s maximal directivity theorem, it is demonstrated that the maximal backscattering ...
  • Upper bounds on scattering processes and metamaterial-inspired structures that reach them 

    Ederra Urzainqui, Íñigo Upna; Liberal Olleta, Íñigo; Gonzalo García, Ramón Upna; Ziolkowski, Richard W. (IEEE, 2014)   Artículo / Artikulua  OpenAccess
    The physical limitations on time-harmonic scattering processes are investigated on the basis of the optical theorem. Previously derived least upper bounds on the total scattering and absorption cross-sections are obtained ...
  • Ku band low profile asymmetric Bull’s-Eye antenna with reduced side lobes and monopole feeding 

    Beaskoetxea Gartzia, Unai Upna; Torres García, Alicia E.; Beruete Díaz, Miguel Upna (IEEE, 2018)   Artículo / Artikulua  OpenAccess
    In this paper, a linearly polarized low profile and asymmetric Bull’s-Eye leaky wave antenna fed by a monopole operating at 13 GHz is presented. Broadside radiation from the monopole is achieved by surrounding it with an ...
  • Control digital de los convertidores de cuarto orden continua continua: CUK, SEPIC, ZETA Y X 

    Valls Martí, Josep María (2017)   Tesis Doctoral / Doktoretza tesia  OpenAccess
    En una primera parte de esta tesis doctoral se estudian los convertidores de la clase de Cuk. Es de especial interés la deducción del convertidor X que está poco desarrollada en la literatura. Se hace el estudio de cada ...
  • Annular apertures in metallic screens as extraordinary transmission and frequency selective surface structures 

    Rodríguez Ulibarri, Pablo Upna; Navarro Cía, Miguel Upna; Rodríguez Berral, Raúl; Mesa, Francisco; Medina, Francisco Upna; Beruete Díaz, Miguel Upna (IEEE, 2017)   Artículo / Artikulua  OpenAccess
    A 2-D periodic array of annular apertures (or ring slots) is studied using an accurate circuit model. The model accounts for distributed and dynamic effects associated with the excitation of high-order modes operating above ...
  • Challenges in wireless system integration as enablers for indoor context aware environments 

    López Iturri, Peio Upna; Aguirre Gallego, Erik Upna; Azpilicueta Fernández de las Heras, Leyre Upna; Astrain Escola, José Javier Upna; Villandangos Alonso, Jesús; Falcone Lanas, Francisco Javier Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
    The advent of fully interactive environments within Smart Cities and Smart Regions requires the use of multiple wireless systems. In the case of user-device interaction, which finds multiple applications such as Ambient ...
  • Characterization of radio propagation channel in urban vehicle to infrastructure environments to support WSNs 

    Granda, Fausto; Azpilicueta Fernández de las Heras, Leyre; Vargas Rosales, César; López Iturri, Peio Upna; Aguirre Gallego, Erik Upna; Astrain Escola, José Javier Upna; Villandangos Alonso, Jesús; Falcone Lanas, Francisco Javier Upna (MDPI, 2016)   Congreso / Biltzarra  OpenAccess
    Vehicular ad hoc Networks (VANETs) enable vehicles to communicate with each other as well as with roadside units (RSUs). Although there is a significant research effort in radio channel modelling focused in vehicle to ...
  • Analysis of bluetooth-based wireless sensor networks performance in hospital environments 

    López Iturri, Peio Upna; Led Ramos, Santiago Upna; Aguirre Gallego, Erik Upna; Azpilicueta Fernández de las Heras, Leyre Upna; Serrano Arriezu, Luis Javier Upna; Falcone Lanas, Francisco Javier Upna (MDPI, 2016)   Congreso / Biltzarra  OpenAccess
    In this work, a method to analyze the performance of Bluetooth-based Wireless Sensor Networks (WSN) deployed within hospital environments is presented. Due to the complexity that this kind of scenarios exhibit in terms of ...
  • Spatial characterization of radio propagation channel in urban vehicle-to-infrastructure environments to support WSNs deployment 

    Granda, Fausto; Azpilicueta Fernández de las Heras, Leyre Upna; Vargas Rosales, César; López Iturri, Peio Upna; Aguirre Gallego, Erik Upna; Astrain Escola, José Javier Upna; Villandangos Alonso, Jesús; Falcone Lanas, Francisco Javier Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
    Vehicular ad hoc Networks (VANETs) enable vehicles to communicate with each other as well as with roadside units (RSUs). Although there is a significant research effort in radio channel modeling focused on vehicle-to-vehicle ...
  • Humidity sensor based on Bragg gratings developed on the end facet of an optical fiber by sputtering of one single material 

    Ascorbe Muruzabal, Joaquín Upna; Corres Sanz , Jesús María Upna; Arregui San Martín, Francisco Javier Upna; Matías Maestro, Ignacio Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
    The refractive index of sputtered indium oxide nanocoatings has been altered just by changing the sputtering parameters, such as pressure. These induced changes have been exploited for the generation of a grating on the ...
  • Optical fibre sensors using graphene-based materials: a review 

    Hernáez Sáenz de Zaitigui, Miguel Upna; Ruiz Zamarreño, Carlos Upna; Melendi Espina, Sonia; Bird, Liam; Mayes, Andrew; Arregui San Martín, Francisco Javier Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
    Graphene and its derivatives have become the most explored materials since Novoselov and Geim (Nobel Prize winners for Physics in 2010) achieved its isolation in 2004. The exceptional properties of graphene have attracted ...
  • Recent developments in fiber optics humidity sensors 

    Ascorbe Muruzabal, Joaquín Upna; Corres Sanz , Jesús María Upna; Arregui San Martín, Francisco Javier Upna; Matías Maestro, Ignacio Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
    A wide range of applications such as health, human comfort, agriculture, food processing and storage, and electronic manufacturing, among others, require fast and accurate measurement of humidity. Sensors based on optical ...
  • Implementation and analysis of a wireless sensor network-based pet location monitoring system for domestic scenarios 

    Aguirre Gallego, Erik Upna; López Iturri, Peio Upna; Azpilicueta Fernández de las Heras, Leyre Upna; Astrain Escola, José Javier Upna; Villadangos Alonso, Jesús Upna; Santesteban, Daniel; Falcone Lanas, Francisco Javier Upna (MDPI, 2016)   Congreso / Biltzarra  OpenAccess
    The flexibility of new age wireless networks and the variety of sensors to measure a high number of variables, lead to new scenarios where anything can be monitored by small electronic devices, thereby implementing Wireless ...
  • Radio characterization for ISM 2.4 GHz wireless sensor networks for judo monitoring applications 

    López Iturri, Peio Upna; Aguirre Gallego, Erik Upna; Azpilicueta Fernández de las Heras, Leyre Upna; Astrain Escola, José Javier Upna; Villadangos Alonso, Jesús Upna; Falcone Lanas, Francisco Javier Upna (MDPI, 2014)   Artículo / Artikulua  OpenAccess
    In this work, the characterization of the radio channel for ISM 2.4GHz Wireless Sensor Networks (WSNs) for judo applications is presented. The environments where judo activity is held are usually complex indoor scenarios ...
  • Implementation of context aware e-health environments based on social sensor networks 

    Aguirre Gallego, Erik Upna; Led Ramos, Santiago Upna; López Iturri, Peio Upna; Azpilicueta Fernández de las Heras, Leyre; Serrano Arriezu, Luis Javier Upna; Falcone Lanas, Francisco Javier Upna (MDPI, 2016)   Artículo / Artikulua  OpenAccess
    In this work, context aware scenarios applied to e-Health and m-Health in the framework of typical households (urban and rural) by means of deploying Social Sensors will be described. Interaction with end-users and ...

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