Recent Submissions

  • Labyrinth metasurface for biosensing applications: numerical study on the new paradigm of metageometries 

    Jáuregui López, Irati; Rodríguez Ulibarri, Pablo Upna; Kuznetsov, Sergei A.; Quemada Mayoral, Carlos; Beruete Díaz, Miguel Upna (MDPI, 2019)   Artículo / Artikulua  OpenAccess
    The use of metasurfaces operating in the terahertz regime as biosensor devices has attracted increased interest in recent years due to their enhanced sensitivity and more accurate detection capability. Typical designs are ...
  • General synthesis of tapered matching sections for single mode operation using the coupled-mode theory 

    Percaz Ciriza, Jon Mikel Upna; Arnedo Gil, Israel Upna; Arregui Padilla, Iván Upna; Teberio Berdún, Fernando Upna; Martín Iglesias, Petronilo; Gómez Laso, Miguel Ángel Upna; Lopetegui Beregaña, José María Upna (IEEE, 2019)   Artículo / Artikulua
    In this paper, a novel and general method to synthetize microwave waveguide tapers intended for single mode operation is proposed. The technique is based on the use of an exact series solution of the inverse scattering ...
  • Supercapacitors: electrical characteristics, modelling, applications and future trends 

    Berrueta Irigoyen, Alberto; Ursúa Rubio, Alfredo Upna; San Martín Biurrun, Idoia Upna; Eftekhari, Ali; Sanchís Gúrpide, Pablo Upna (IEEE, 2019)   Artículo / Artikulua  OpenAccess
    Energy storage systems are playing an increasingly important role in a variety of applications, such as electric vehicles or grid-connected systems. In this context, supercapacitors (SCs) are gaining ground due to their ...
  • Watt-level green random laser at 532  nm by SHG of Yb-doped fiber laser 

    Rota Rodrigo, Sergio Upna; Gouhier, B.; Dixneuf, C.; Antoni Micollier, L.; Guiraud, G.; Leandro González, Daniel Upna; López-Amo Sáinz, Manuel Upna; Traynor, N.; Santarelli, G. (Optical Society of America, 2018)   Artículo / Artikulua  OpenAccess
    We have developed a Watt-level random laser at 532 nm. The laser is based on a 1064 nm random distributed ytterbium-gain assisted fiber laser seed with a 0.35 nm line-width and 900 mW polarized output power. A study for ...
  • Real time measuring system of multiple chemical parameters using microstructured optical fibers based sensors 

    López Aldaba, Aitor Upna; López Torres, Diego Upna; Elosúa Aguado, César Upna; Arregui San Martín, Francisco Javier Upna; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe; López-Amo Sáinz, Manuel Upna (IEEE, 2018)   Artículo / Artikulua  OpenAccess
    In this paper, a multiplexing system for simultaneous interrogation of optical fiber sensors which measure different parameters is presented and validated. The whole system has been tested with 6 different sensing heads ...
  • Far-field and near-field physics of extraordinary THz transmitting hole-array antennas 

    Camacho, Miguel; Boix, Rafael R.; Kuznetsov, Sergei A.; Beruete Díaz, Miguel Upna; Navarro Cía, Miguel (IEEE, 2019)   Artículo / Artikulua  OpenAccess
    Despite three decades of effort, predicting accurately extraordinary transmission through subwavelength hole arrays has proven challenging. The lack of quantitative design and modeling capability to take into account ...
  • A water content continuous monitoring of grapevine xylem tissue using a portable low-power cost-effective FMCW radar 

    Quemada Mayoral, Carlos; García González, Cebrián; Iriarte Galarregui, Juan Carlos Upna; Marín Ederra, Diana; Gastón Beraza, Diego; Miranda Jiménez, Carlos Upna; Gonzalo García, Ramón Upna; Maestrojuán Biurrun, Itziar Upna; Santesteban García, Gonzaga Upna; Ederra Urzainqui, Íñigo Upna (IEEE, 2019)   Artículo / Artikulua
    This paper presents the real-time monitoring of a grapevine’s water content that flows up through the xylem tissue by means of a frequency-modulated continuous-wave (FMCW) radar. The application of an optimization process, ...
  • Strong angular dependence of resonant states in 2D dielectric cylinder rings 

    Andueza Unanua, Ángel María; Pérez Conde, Jesús Upna; Sevilla Moróder, Joaquín Upna (AIP Publishing, 2018)   Artículo / Artikulua
    We investigate collective resonators made of dielectric cylinders assembled as two-dimensional regular octagons and decagons. These structures exhibit collective resonance states that change their intensity with the incident ...
  • Study on isolation improvement between closely-packed patch antenna arrays based on fractal metamaterial electromagnetic bandgap structures 

    Alibakhshikenari, Mohammad; Virdee, Bal S.; See, Chan H.; Abd-Alhameed, Raed; Ali, Abdul; Hussein Ali, Ammar; Falcone Lanas, Francisco Javier Upna; Limiti, Ernesto (Institution of Engineering and Technology, 2018)   Artículo / Artikulua  OpenAccess
    A decoupling metamaterial (MTM) configuration based on fractal electromagnetic-bandgap (EMBG) structure is shown to significantly enhance isolation between transmitting and receiving antenna elements in a closely-packed ...
  • Exact inter-discharge interval distribution of motor unit firing patterns with gamma model 

    Navallas Irujo, Javier Upna; Porta Cuéllar, Sonia; Malanda Trigueros, Armando Upna (Springer, 2019)   Artículo / Artikulua  OpenAccess
    Inter-discharge interval distribution modeling of the motor unit firing pattern plays an important role in electromyographic decomposition and the statistical analysis of firing patterns. When modeling firing patterns ...
  • Virtual FBGs using saturable absorbers for sensing with fiber lasers 

    Rodríguez Cobo, L.; Pérez Herrera, Rosa Ana Upna; Quintela, M. A.; Ruiz Lombera, Rubén; López-Amo Sáinz, Manuel Upna; López Higuera, José Miguel (MDPI, 2018)   Artículo / Artikulua  OpenAccess
    The spectral narrowing of Fiber Bragg Gratings (FBGs) introduced by unpumped Er-doped fiber (EDF) was analyzed for fiber lasers (FL). Owing to spatial hole burning (SHB), the spectral response of a virtual FBG can be ...
  • Integration of autonomous wireless sensor networks in academic school gardens 

    López Iturri, Peio; Celaya Echarri, Mikel; Azpilicueta Fernández de las Heras, Leyre; Aguirre Gallego, Erik; Astrain Escola, José Javier Upna; Villadangos Alonso, Jesús Upna; Falcone Lanas, Francisco Javier Upna (MDPI, 2018)   Artículo / Artikulua  OpenAccess
    In this work, the combination of capabilities provided by Wireless Sensor Networks (WSN) with parameter observation in a school garden is employed in order to provide an environment for school garden integration as a ...
  • Connection of the SUMO microscopic traffic simulator and the unity 3D game engine to evaluate V2X communication-based systems 

    Olaverri Monreal, Cristina; Errea-Moreno Javier; Díaz-Álvarez, Alberto; Biurrun Quel, Carlos; Serrano Arriezu, Luis Javier Upna; Kuba, Markus (MDPI, 2018)   Artículo / Artikulua  OpenAccess
    In-vehicle applications that are based on Vehicle-to-Everything (V2X) communication technologies need to be evaluated under lab-controlled conditions before performing field tests. The need for a tailored platform to perform ...
  • On the stability of advanced power electronic converters: the Generalized Bode Criterion 

    Lumbreras Magallón, David; Barrios, Rípodas, Ernesto Upna; Urtasun Erburu, Andoni Upna; Ursúa Rubio, Alfredo Upna; Marroyo Palomo, Luis Upna; Sanchís Gúrpide, Pablo Upna (IEEE, 2019)   Artículo / Artikulua
    A key factor in the design of power electronic converters is the development of control systems and, in particular, the determination of their stability. Due to ease of application, the Bode criteria are currently the most ...
  • Super class AB RFC OTA with adaptive local common-mode feedback 

    Garde Luque, María Pilar; López Martín, Antonio Upna; Carvajal, Ramón G.; Ramírez-Angulo, Jaime (Institution of Engineering and Technology, 2018)   Artículo / Artikulua  OpenAccess
    A super class AB recycling folded cascode operational transconductance amplifier is presented. It employs local common-mode feedback using two matched tuneable active resistors, allowing to adapt the amplifier to different ...
  • Robust and accurate 2D-tracking-based 3D positioning method: application to head pose estimation 

    Ariz Galilea, Mikel; Villanueva Larre, Arantxa Upna; Cabeza Laguna, Rafael Upna (Elsevier, 2019)   Artículo / Artikulua  OpenAccess
    Head pose estimation (HPE) is currently a growing research field, mainly because of the proliferation of human–computer interfaces (HCI) in the last decade. It offers a wide variety of applications, including human behavior ...
  • Aluminum doped zinc oxide (AZO) coated optical fiber LMR refractometers—An experimental demonstration 

    Ozcariz Celaya, Aritz Upna; Piña-Azamar, Dafne A.; Ruiz Zamarreño, Carlos Upna; Dominguez, René; Arregui San Martín, Francisco Javier Upna (Elsevier, 2019)   Artículo / Artikulua
    This work presents the experimental demonstration of lossy mode resonance generation by means of aluminum doped zinc oxide thin-films. The use of such material may allow to optimize the performance of LMR-based sensors, ...
  • Design procedure for new compact waffle-iron ilters with transmission zeros 

    Teberio Berdún, Fernando Upna; Percaz Ciriza, Jon Mikel Upna; Arregui Padilla, Iván Upna; Martín Iglesias, Petronilo; Lopetegui Beregaña, José María Upna; Gómez Laso, Miguel Ángel Upna; Arnedo Gil, Israel Upna (IEEE, 2018)   Artículo / Artikulua
    In this paper, a novel waffle-iron filter with transmission zeros at multiple frequencies, along with its design procedure, is presented. The proposed filter features a high-power behavior and a wide rejected band in a ...
  • Lossy mode resonance optical sensors based on indium-gallium-zinc oxide thin film 

    Ozcariz Celaya, Aritz Upna; Dominik, Magdalena; Smietana, Mateusz; Ruiz Zamarreño, Carlos Upna; Del Villar, Ignacio Upna; Arregui San Martín, Francisco javier Upna (Elsevier, 2019)   Artículo / Artikulua
    This work discusses an application of electrically conductive and optically transparent indium-gallium-zinc oxide (IGZO) thin films for fabrication of lossy mode resonance (LMR) based optical fiber refractometers. The films ...
  • Combined dynamic programming and region-elimination technique algorithm for optimal sizing and management of lithium-ion batteries for photovoltaic plants 

    Berrueta Irigoyen, Alberto; Heck, Michael; Jantsch, Martin; Ursúa Rubio, Alfredo Upna; Sanchis Gúrpide, Pablo (Elsevier, 2018)   Artículo / Artikulua
    The unpredictable nature of renewable energies is drawing attention to lithium-ion batteries. In order to make full utilization of these batteries, some research works are focused on the management of existing systems, ...

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