Now showing items 1-20 of 65

    • Active control for medium-frequency transformers flux-balancing in a novel three-phase topology for cascaded conversion structures 

      Lumbreras Magallón, David Upna Orcid; Barrios Rípodas, Ernesto Upna Orcid; Navarrete, Manuel; Balda Belzunegui, Julián; González Senosiain, Roberto Upna; Sanchis Gúrpide, Pablo Upna Orcid (IEEE, 2020)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Efficiency and power density are important parameters in the design of power electronics converters. In many applications, low-frequency transformers are being substituted for medium-frequency and high-frequency transformers ...
    • Aluminum coated fiber optic sensor for enhancing flow rate measurement 

      Rodríguez Rodríguez, Armando; Urroz Unzueta, José Carlos Upna Orcid; Diéguez Elizondo, Pedro Upna Orcid; Bravo Acha, Mikel Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid; López Rodríguez, José Javier Upna Orcid (SPIE, 2023)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A water flow and velocity aluminum-coated Fiber Bragg Grating sensor system for open channels was designed, simulated and tested. The sensing head was designed, ruggedized and customized to measure velocities at ...
    • Asymmetrical firing angle modulation for 12-pulse thyristor rectifiers supplying high-power electrolyzers 

      Iribarren Zabalegui, Álvaro Upna; Barrios Rípodas, Ernesto Upna Orcid; Elizondo Martínez, David Upna Orcid; Sanchis Gúrpide, Pablo Upna Orcid; Ursúa Rubio, Alfredo Upna Orcid (IEEE, 2023)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      This paper presents an asymmetrical firing angle modulation strategy for 12-pulse thyristor rectifiers aimed at supplying high-power electrolyzers, which allows to reduce the size of the passive filter and the static ...
    • Building global competencies: a strategic approach to internationalization of engineering education 

      Berrueta Irigoyen, Alberto Upna Orcid; Samanes Pascual, Javier Upna Orcid; Parra Laita, Íñigo de la Upna Orcid; Goicoechea Fernández, Javier Upna Orcid; Sanchis Gúrpide, Pablo Upna Orcid (Eindhoven University of Technology and Fontys University of Applied Sciences, 2023)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      International mobility is an essential aspect of undergraduate education that enables students to acquire the necessary competences required by the European Higher Education Area (EHEA). However, small universities such ...
    • Compact antennas in ridge gap waveguide with circular polarization 

      Pérez Quintana, Dayan Upna Orcid; Ederra Urzainqui, Íñigo Upna Orcid; Beruete Díaz, Miguel Upna Orcid (IEEE, 2020)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, two compact antennas in Ridge Gap Waveguide (RGW) technology, working at 60 GHz, with a high-purity circular polarization (CP) within a broad bandwidth are manufactured and measured. The antennas are fed ...
    • Compact bull's-eye antenna in ridge gap waveguide with circular polarization at 60 GHz 

      Pérez Quintana, Dayan Upna Orcid; Ederra Urzainqui, Íñigo Upna Orcid; Beruete Díaz, Miguel Upna Orcid (IEEE, 2021)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work, a Bull's-Eye (BE) antenna with circular polarization (CP) based on ridge gap waveguide (RGW) technology, working in the millimeter-wave band (60 GHz) is numerically and experimentally demonstrated. The structure ...
    • Compact harmonic rejection filter for C-band high-power satellite applications 

      Teberio Berdún, Fernando Upna Orcid; Martín Iglesias, Petronilo; Arregui Padilla, Iván Upna Orcid; Arnedo Gil, Israel Upna Orcid; Lopetegui Beregaña, José María Upna Orcid; Gómez Laso, Miguel Ángel Upna Orcid (IEEE, 2020)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A compact high-power low-pass filter for C-band broadband satellite applications is presented in this paper. The filter is composed of three different sections. A 9th-order compact high-power multi-ridge structure achieves ...
    • Compact optical fiber lasers and optical fiber sensors assisted by femtosecond laser inscription of plane-by-plane FBGs 

      Roldán Varona, Pablo; Pallarés Aldeiturriaga, D.; Rodríguez Cobo, Luis; Pérez Herrera, Rosa Ana Upna Orcid; Bravo Acha, Mikel Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid; López Higuera, José Miguel (Optica, 2020)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Development of a high temperature sensor based on optical fiber l aser generated from a cavity of reduced dimensions (43 mm) in Er-doped fiber. The mirror FBGs have been inscribed with femtosecond laser using the slit beam ...
    • Compact pillbox reflector based on geodesic lens 

      Pérez Quintana, Dayan; Chen, Q.; Beruete Díaz, Miguel Upna Orcid; Quevedo-Teruel, O. (IEEE, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      We propose a pillbox antenna in combination with a geodesic lens at 60 GHz. The antenna is implemented in a dual-layer parallel plate waveguide. The waves from a geodesic lens in a first layer, after being reflected by a ...
    • Comparison of a slotted SIW antenna covered with metasurface vs. a traditional array 

      Chocarro Álvarez, Javier; Pérez Escudero, José Manuel Upna Orcid; Ederra Urzainqui, Íñigo Upna Orcid (IEEE, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this article we compare two solutions to improve the radiation pattern of a slotted Substrate Integrated Waveguide (SIW) antenna: use of an E-plane array and covering it with a metasurface (MTS). To this aim, we compare ...
    • Control strategy for a droop-controlled grid-connected DFIG wind turbine 

      Oraá Iribarren, Iker; Samanes Pascual, Javier Upna Orcid; López Taberna, Jesús Upna Orcid; Gubía Villabona, Eugenio Upna Orcid (IEEE, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The application of droop control techniques without inner current control loops to doubly-fed induction generator (DFIG) based wind turbines does not allow to provide a stable response at all operating points in terms of ...
    • Design alternatives for a submm-wave Fabry-Perot cavity antenna 

      Platero Rodrigo, Naiara; Iriarte Galarregui, Juan Carlos Upna Orcid; Ederra Urzainqui, Íñigo Upna Orcid (IEEE, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      This paper discusses different design alternatives for a high gain planar antenna at 240 GHz. The antenna is based on a Fabry-Perot configuration, where two different partial reflection surfaces (PRS) are considered: a ...
    • Design of a slotted Substrate Integrated waveguide antenna using a metasurface 

      Chocarro Álvarez, Javier; Pérez Escudero, José Manuel Upna Orcid; Ederra Urzainqui, Íñigo Upna Orcid (IEEE, 2021)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, the use of a metasurface to improve the radiation properties of a Substrate Integrated Waveguide based slotted antenna is proposed. The design process of a metasurface covered 8 element slot antenna array ...
    • Development of a water flow and velocity optical fiber sensor for field testing 

      Rodríguez Rodríguez, Armando; Urroz Unzueta, José Carlos Upna Orcid; Diéguez Elizondo, Pedro Upna Orcid; Bravo Acha, Mikel Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid; López Rodríguez, José Javier Upna Orcid (Optica Publishing Group, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A water flow and velocity fiber optic sensor system was developed and tested. The sensing head was especially developed and ruggedized to measure velocities at different depths, in order to calculate the discharge in channels.
    • Distributed humidity sensor for moisture-front monitoring in soils 

      Leandro González, Daniel Upna Orcid; Delgado Zabala, Oihane; López Rodríguez, José Javier Upna Orcid; Bravo Acha, Mikel Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid (Optica, 2020)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this contribution, high spatial resolution distributed humidity sensing was demonstrated for moisture-front monitoring in soils by using polyimide coated optical fiber.
    • Effect of the inner current loop on the voltage regulation for three-phase photovoltaic inverters 

      Urtasun Erburu, Andoni Upna Orcid; Sanchis Gúrpide, Pablo Upna Orcid; Marroyo Palomo, Luis Upna Orcid (IEEE, 2020)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In three-phase grid-connected PV inverters, regulating the input voltage is a fundamental requirement. In order to reduce the influence of the PV non-linear behavior and ensure stability in the whole operating range, the ...
    • Enhanced optical fiber lasers and optical fiber sensors assisted by micro-drilled optical fibers 

      Pérez Herrera, Rosa Ana Upna Orcid; Bravo Acha, Mikel Upna Orcid; Roldán Varona, Pablo; Leandro González, Daniel Upna Orcid; Rodríguez Cobo, Luis; López Higuera, José Miguel; López-Amo Sáinz, Manuel Upna Orcid (Optica, 2020)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Enhanced OFS assisted by micro-drilled optical fibers acting as mirrors are demonstrated. Strain sensitivity improved more than one order of magnitude in comparison with FBG sensors using a 50 μm-waist micro-drilled taper ...
    • Evolutionary algorithms applied to multi-layered radiative cooling metamaterials 

      Lezaun Capdevila, Carlos; Jorajuría, Tania Upna Orcid; Torres García, Alicia E. Upna Orcid; Herrera, Pilar; Beruete Díaz, Miguel Upna Orcid (IEEE, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A newly design method for designing multi-layered radiative cooling metamaterials based on genetic algorithms (GAs) is exposed. The developed GA has been tested in three cases, resulting in three different structures that ...
    • f-HybridMem: a consensual analysis via fuzzy consensus measures and penalty functions 

      Oliveira, Lizandro de Souza; Yamin, Adenauer; Reiser, Renata; Santos, Helida (IEEE, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      This paper considers the consensual analysis in decision-making (CDM) processes based on fuzzy logic (FL) and interval-valued fuzzy logic (IVFL), providing a CDM-strategy, by exploring the axiomatic properties of fuzzy ...
    • Femtosecond laser inscription of diffraction gratings in CYTOP fibers for optical fiber sensing 

      Lomer, Mauro; Roldán Varona, Pablo; Algorri, J. F.; Rodríguez Cobo, Luis; Pérez Herrera, Rosa Ana Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid; López Higuera, José Miguel (SEDOPTICA, 2021)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The use of the new CYTOP fibers for the inscription of optical structures and the sensing of different parameters has started to gain importance in the last decade. This work presents the design and manufacture of a CYTOP ...

      El Repositorio ha recibido la ayuda de la Fundación Española para la Ciencia y la Tecnología para la realización de actividades en el ámbito del fomento de la investigación científica de excelencia, en la Línea 2. Repositorios institucionales (convocatoria 2020-2021).
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