• 250 km ultra long remote sensor system based on a fiber loop mirror interrogated by an OTDR 

      Bravo Acha, Mikel Upna Orcid; Baptista, José Manuel; Santos, José Luís; López-Amo Sáinz, Manuel Upna Orcid; Frazão, Orlando (Optical Society of America, 2011)   Artículo / Artikulua  OpenAccess
      A 253 km ultra long remote displacement sensor system based on a fiber loop mirror interrogated by a commercial OTDR is proposed and experimentally demonstrated. The use of a fiber loop mirror increases the signal to noise ...
    • 3D-printed 96 GHz bull’s-eye antenna with off-axis beaming 

      Beaskoetxea Gartzia, Unai Upna Orcid; Maci, Stefano; Navarro Cía, Miguel Upna Orcid; Beruete Díaz, Miguel Upna Orcid (IEEE, 2017)   Artículo / Artikulua  OpenAccess
      Reducing the profile, footprint and weight of antennas embarked on aircrafts, drones or satellites has been a long pursued objective. Here we tackle this issue by developing a millimeter-wave 96 GHz elliptical Bull’s-Eye ...
    • 46-km-long Raman amplified hybrid double-bus network with point and distributed Brillouin sensors 

      Fernández Vallejo, Montserrat Upna; Olier Aguado, David; Zornoza Indart, Ander; Pérez Herrera, Rosa Ana Upna Orcid; Díaz Lucas, Silvia Upna Orcid; Elosúa Aguado, César Upna Orcid; Bariáin Aisa, Cándido Upna Orcid; Loayssa Lara, Alayn Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid (IEEE, 2012)   Artículo / Artikulua  OpenAccess
      We experimentally demonstrate a 46-km hybrid network that combine point and distributed Brillouin sensors. The proposed sensor network multiplexes low-cost intensity point sensors based on fiber-optic tapers, which are ...
    • 77-GHz high-gain bull’s-eye antenna with sinusoidal profile 

      Beaskoetxea Gartzia, Unai Upna Orcid; Pacheco-Peña, Víctor Upna Orcid; Orazbayev, Bakhtiyar Upna Orcid; Akalin, Tahsin; Maci, Stefano; Navarro Cía, Miguel Upna Orcid (IEEE, 2015)   Artículo / Artikulua  OpenAccess
      A high-gain Bull’s-Eye leaky-wave horn antenna working at 77 GHz with sinusoidal profile has been designed, fabricated, and experimentally measured. The influence of the number of periods on the gain and beamwidth is ...
    • Accurate circuit modeling of fishnet structures for negative-index-medium applications 

      Torres Landívar, Víctor Upna; Mesa, Francisco; Navarro Cía, Miguel Upna Orcid; Rodríguez Berral, Raúl; Beruete Díaz, Miguel Upna Orcid; Medina, Francisco (IEEE, 2016)   Artículo / Artikulua  OpenAccess
      Metallic plates with a two-dimensional (2D) periodic distribution of sub-wavelength apertures are known to exhibit extraordinary transmission of electromagnetic waves. Stacking two or more of such plates gives place to the ...
    • Actividad electromiográfica (EMG) durante el pedaleo, su utilidad en el diagnóstico de la fatiga en ciclistas 

      Córdova Martínez, Alfredo; Nuin, Iván; Fernández-Lázaro, Diego; Latasa Zudaire, Iban Alexander Upna Orcid; Rodríguez Falces, Javier Upna Orcid (SEMED - FEMEDE, 2017)   Artículo / Artikulua  OpenAccess
      La fatiga muscular tiene múltiples definiciones, pero con una misión especial cual es la misión protectora, avisando al organismo sobre la debilidad o la aparición de una incapacidad funcional. En esta revisión se hace ...
    • Adaptive voltage control of the DC/DC boost stage in PV converters with small input capacitor 

      Urtasun Erburu, Andoni Upna Orcid; Sanchis Gúrpide, Pablo Upna Orcid; Marroyo Palomo, Luis Upna Orcid (IEEE, 2013)   Artículo / Artikulua  OpenAccess
      In the case of photovoltaic (PV) systems, an adequate PV voltage regulation is fundamental in order to both maximize and limit the power. For this purpose, a large input capacitor has traditionally been used. However, when ...
    • Advances in residential design related to the influence of geomagnetism 

      Glaria, Francisco; Arnedo Gil, Israel Upna Orcid; Sánchez Ostiz, Ana (MDPI, 2018)   Artículo / Artikulua  OpenAccess
      Since the origin of the Modern Movement, there has been a basic commitment to improving housing conditions and the well-being of occupants, especially given the prediction that 2/3 of humanity will reside in cities by 2050. ...
    • All-dielectric periodic terajet waveguide using an array of coupled cuboids 

      Minin, Igor V.; Minin, Oleg V.; Pacheco-Peña, Víctor Upna Orcid; Beruete Díaz, Miguel Upna Orcid (AIP Publishing, 2015)   Artículo / Artikulua  OpenAccess
      In this paper, the recently proposed technique to produce photonic jets (terajets at terahertz (THz) frequencies) using 3D dielectric cuboids is applied in the design of a mesoscale cuboid-chain wave- guide. The chains are ...
    • All-fiber lasers through photonic crystal fibers 

      Rodrigues Pinto, Ana Margarida Upna; López-Amo Sáinz, Manuel Upna Orcid (Science Wise Publishing & De Gruyter, 2013)   Artículo / Artikulua  OpenAccess
      A review on all-fiber lasers based on photonic crystal fibers is presented. Photonic crystal fibers present improved features beyond what conventional optical fibers can offer. Due to their geometric versatility, photonic ...
    • All-PM fiber loop mirror interferometer analysis and simultaneous measurement of temperature and mechanical vibration 

      Leandro González, Daniel Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid (IEEE, 2018)   Artículo / Artikulua  OpenAccess
      In this work, a new all-polarization maintaining (PM) fiber loop mirror interferometer is proposed and validated as temperature and mechanical vibration sensor. The scheme employs the arms of a PM coupler as communication ...
    • Analysis and description of HOLTIN service provision for AECG monitoring in complex indoor environments 

      Led Ramos, Santiago Upna Orcid; Azpilicueta Fernández de las Heras, Leyre Upna Orcid; Aguirre Gallego, Erik Upna Orcid; Martínez de Espronceda Cámara, Miguel Upna Orcid; Serrano Arriezu, Luis Javier Upna Orcid; Falcone Lanas, Francisco Javier Upna Orcid (MDPI, 2013)   Artículo / Artikulua  OpenAccess
      In this work, a novel ambulatory ECG monitoring device developed in-house called HOLTIN is analyzed when operating in complex indoor scenarios. The HOLTIN system is described, from the technological platform level to its ...
    • Analysis matrix for smart cities 

      Branchi, Pablo Emilio Upna; Fernández Valdivielso, Carlos Upna; Matías Maestro, Ignacio Upna Orcid (MDPI, 2014)   Artículo / Artikulua  OpenAccess
      The current digital revolution has ignited the evolution of communications grids and the development of new schemes for productive systems. Traditional technologic scenarios have been challenged, and Smart Cities have ...
    • Analysis of one-dimensional photonic band gap structures with a liquid crystal defect towards development of fiber-optic tunable wavelength filters 

      Del Villar, Ignacio Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Claus, Richard O. (Optical Society of America, 2003)   Artículo / Artikulua  OpenAccess
      A theoretical analysis of a fiber optical photonic band gap based tunable wavelength filter is presented. The design presented here is based on the quarter wave reflector with a liquid crystal defect layer in the middle ...
    • Analysis of radio wave propagation for ISM 2.4 GHz wireless sensor networks in inhomogeneous vegetation environments 

      Azpilicueta Fernández de las Heras, Leyre Upna Orcid; López Iturri, Peio Upna Orcid; Aguirre Gallego, Erik Upna Orcid; Mateo Zozaya, Ignacio; Astrain Escola, José Javier Upna Orcid; Villadangos Alonso, Jesús Upna Orcid; Falcone Lanas, Francisco Javier Upna Orcid (MDPI, 2014)   Artículo / Artikulua  OpenAccess
      The use of wireless networks has experienced exponential growth due to the improvements in terms of battery life and low consumption of the devices. However, it is compulsory to conduct previous radio propagation analysis ...
    • Analysis of wireless sensor network topology and estimation of optimal network deployment by deterministic radio channel characterization 

      Aguirre Gallego, Erik Upna Orcid; López Iturri, Peio Upna Orcid; Azpilicueta Fernández de las Heras, Leyre Upna Orcid; Astrain Escola, José Javier Upna Orcid; Villadangos Alonso, Jesús Upna Orcid; Falcone Lanas, Francisco Javier Upna Orcid (MDPI, 2015)   Artículo / Artikulua  OpenAccess
      One of the main challenges in the implementation and design of context-aware scenarios is the adequate deployment strategy for Wireless Sensor Networks (WSNs), mainly due to the strong dependence of the radiofrequency ...
    • Analytical design methodology for Litz-wired high-frequency power transformers 

      Barrios Rípodas, Ernesto Upna Orcid; Ursúa Rubio, Alfredo Upna Orcid; Marroyo Palomo, Luis Upna Orcid; Sanchis Gúrpide, Pablo Upna Orcid (IEEE, 2015)   Artículo / Artikulua  OpenAccess
      In the last quarter of a century, high-frequency (HF) transformer design has been one of the major concerns to power electronics designers in order to increase converter power densities and efficiencies. Conventional design ...
    • Annular apertures in metallic screens as extraordinary transmission and frequency selective surface structures 

      Rodríguez Ulibarri, Pablo Upna Orcid; Navarro Cía, Miguel Upna Orcid; Rodríguez Berral, Raúl; Mesa, Francisco; Medina, Francisco; Beruete Díaz, Miguel Upna Orcid (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 ...
    • An antibacterial coating based on a polymer/sol-gel hybrid matrix loaded with silver nanoparticles 

      Rivero Fuente, Pedro J. Upna Orcid; Urrutia Azcona, Aitor Upna Orcid; Goicoechea Fernández, Javier Upna Orcid; Ruiz Zamarreño, Carlos Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Matías Maestro, Ignacio Upna Orcid (Springer, 2011)   Artículo / Artikulua  OpenAccess
      In this work a novel antibacterial surface composed of an organic-inorganic hybrid matrix of tetraorthosilicate and a polyelectrolyte is presented. A precursor solution of tetraethoxysilane (TEOS) and poly(acrylic acid ...
    • Application of gold complexes in the development of sensors for volatile organic compounds 

      Luquin, Asunción Upna Orcid; Elosúa Aguado, César Upna Orcid; Vergara, Elena; Estella, Juncal Upna; Cerrada, Elena; Bariáin Aisa, Cándido Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Garrido Segovia, Julián José Upna Orcid; Laguna, Mariano (World Gold Council, 2007)   Artículo / Artikulua  OpenAccess
      Two different kinds of sensors have been developed by using the same kind of vapochromic complexes. The vapochromic materials [Au2Ag2(C6F5)(4)L-2](n) have different colours depending on the ligand L. These materials change, ...

      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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