Recent Submissions

  • AC coupled amplifier with a resistance multiplier technique for ultra-low frequency operation 

    Martincorena Arraiza, Maite Upna Orcid; Cruz Blas, Carlos Aristóteles de la Upna Orcid; Carlosena García, Alfonso Upna Orcid; López Martín, Antonio Upna Orcid (Elsevier, 2022)   Artículo / Artikulua  OpenAccess
    This paper proposes a novel, tunable AC coupled capacitive feedback amplifier, exhibiting an ultra-low high pass corner frequency. This is accomplished by actively boosting the output resistive value of a MOS transistor ...
  • A PV ramp-rate control strategy to extend battery lifespan using forecasting 

    González Moreno, Alejandro; Marcos Álvarez, Javier Upna Orcid; Parra Laita, Íñigo de la Upna Orcid; Marroyo Palomo, Luis Upna Orcid (Elsevier, 2022)   Artículo / Artikulua  OpenAccess
    This study analyses and presents a new ramp-rate control algorithm for smoothing PV power fluctuations, designed to address three fundamental objectives: to reduce battery cycling, to meet minimum storage requirements and ...
  • A frequency reconfigurable compact planar inverted-F antenna for portable devices 

    Ghaffar, Adnan; Altaf, Ahsan; Aneja, Aayush; Li, Xue Jun; Khan, Salahuddin; Alibakhshikenari, Mohammad; Falcone Lanas, Francisco Javier Upna Orcid; Limiti, Ernesto (Hindawi, 2022)   Artículo / Artikulua  OpenAccess
    In this paper, a low-profile, compact size, inexpensive, and easily integrable frequency reconfigurable antenna system is proposed. The proposed antenna consists of an inverted-F shape antenna, capacitors, and switching ...
  • A compact CPW-fed ultra-wideband multi-input-multi-output (mimo) antenna for wireless communication networks 

    Ahmad, Sarosh; Khan, Shahid; Manzoor, Bilal; Soruri, Mohammad; Alibakhshikenari, Mohammad; Dalarsson, Mariana; Falcone Lanas, Francisco Javier Upna Orcid (IEEE, 2022)   Artículo / Artikulua  OpenAccess
    In this article, a compact coplanar waveguide (CPW) technique based ultra-wideband multiple-input-multiple-output (MIMO) antenna is proposed. The design is characterized by a broad impedance bandwidth starting from 3 GHz ...
  • Electromagnetic characterization of uhf-rfid fixed reader in healthcare centers related to the personal and labor health 

    Ramos, Victoria; Suarez, Oscar javier; Febles Santana, Víctor M.; Suarez Rodriguez, David samuel; Aguirre Gallego, Erik Upna Orcid; Miguel-Bilbao, Silvia de; Marina, Pablo; Rabassa Lopez Calleja, Luis Enrique; Celaya Echarri, Mikel; Falcone Lanas, Francisco Javier Upna Orcid; Hernandez Armas, Jose Ángel (IEEE, 2022)   Artículo / Artikulua  OpenAccess
    Hospitals and healthcare centers are experiencing a remarkable implementation of new systems based on wireless communications technologies. Many of these systems provide location services and identification of materials, ...
  • Self-referenced optical fiber sensor based on LSPR generated by gold and silver nanoparticles embedded in layer-by-layer nanostructured coatings 

    Martínez Hernández, María Elena Upna Orcid; Goicoechea Fernández, Javier Upna Orcid; Rivero Fuente, Pedro J. Upna Orcid; Sandúa Fernández, Xabier; Arregui San Martín, Francisco Javier Upna Orcid (MDPI, 2022)   Artículo / Artikulua  OpenAccess
    In this work, an optical fiber sensor based on the localized surface plasmon resonance (LSPR) phenomenon has been designed for the detection of two different chemical species (mercury and hydrogen peroxide) by using ...
  • In situ synthesis of gold nanoparticles in layer-b y-layer polymeric coatings for the fabrication of optical fiber sensors 

    Martínez Hernández, María Elena Upna Orcid; Goicoechea Fernández, Javier Upna Orcid; Rivero Fuente, Pedro José; Arregui San Martín, Francisco Javier Upna Orcid (MDPI, 2022)   Artículo / Artikulua  OpenAccess
    A new method is proposed to tune the interferometric response of wavelength-based optical fiber sensors. Using the nanoparticle in situ synthesis (ISS) technique, it is possible to synthesize gold nanoparticles (AuNPs) ...
  • Optical fiber thermo-refractometer 

    Imas González, José Javier Upna Orcid; Ruiz Zamarreño, Carlos Upna Orcid; Del Villar, Ignacio Upna Orcid; Da Silva, J.; Oliveira, V.; Matías Maestro, Ignacio Upna Orcid (Optica, 2022)   Artículo / Artikulua  OpenAccess
    This work presents the implementation of a thermo-refractometer, which integrates the measurement of both refractive index and temperature in a single optical fiber structure. To this purpose, a lossy mode resonance ...
  • Sensores de fibra óptica basados en películas delgadas con nanopartículas metálicas 

    Martínez Hernández, María Elena Upna Orcid (2022)   Tesis doctoral / Doktoretza tesia  OpenAccess
    El estudio del nanoensamblado de nanopartículas metálicas sobre fibra ópticaha contribuido al desarrollo de sensores con mayor sensibilidad y eficiencia. Las aplicaciones que se pueden obtener en este campo pueden variar ...
  • Metal 3D printing for RF/microwave high-frequency parts 

    Martín Iglesias, Petronilo; Gómez Laso, Miguel Ángel Upna Orcid; Lopetegui Beregaña, José María; Teberio Berdún, Fernando Upna Orcid; Arregui Padilla, Iván Upna Orcid; Marechal, M.; Calves, P.; Hazard, M.; Pambaguian, L.; Brandao, A.; Rodríguez Castillo, S.; Martin, T.; Percaz Ciriza, Jon Mikel Upna Orcid; Iza, V.; Martín-Iglesias, Santiago (Springer, 2022)   Artículo / Artikulua
    Space Systems have been historically characterised by high performance, high reliability and high cost. Every new generation of space systems tends to improve performance, keep as much as possible reliability, speeding ...
  • Momentum considerations inside near-zero index materials 

    Lobet, Michaël; Liberal Olleta, Íñigo Upna Orcid; Vertchenko, Larissa; Lavrinenko, Andrei V.; Engheta, Nader; Mazur, Eric (Springer Nature, 2022)   Artículo / Artikulua  OpenAccess
    Near-zero index (NZI) materials, i.e., materials having a phase refractive index close to zero, are known to enhance or inhibit light-matter interactions. Most theoretical derivations of fundamental radiative processes ...
  • Procesamiento de la señal en entornos con partituras digitales 

    Esténoz Abendaño, Ainhoa (2022)   Tesis doctoral / Doktoretza tesia
    La irrupción de la tecnología en la sociedad está definiendo el futuro de todos los sectores empresariales, entre ellos el musical, remodelando su modelo de negocio como resultado de la nueva era digital. New Music Now ...
  • Integrating multiple stubs in stepped-impedance filter aiming for high selectivity 

    Sami, Abdul Upna; Gómez Laso, Miguel Ángel Upna Orcid; Lopetegui Beregaña, José María; Arnedo Gil, Israel; Calero Fernández, Ibai; Teberio Berdún, Fernando Upna Orcid; Martín Iglesias, Petronilo; Benito Pertusa, David Upna Orcid; Arregui Padilla, Iván Upna Orcid (IETWiley, 2022-05-24)   Artículo / Artikulua  OpenAccess
    A design technique to include multiple and fully-controlled transmission zeros (TZs) in the frequency response of rectangular waveguide commensurate-line stepped-impedance filters is presented in this letter. These bandpass ...
  • Grid-forming control for high-power inverters 

    Erdocia Zabala, Ioseba Upna (2022)   Tesis doctoral / Doktoretza tesia
    La crisis medioambiental actual está potenciando el aumento de la demanda de fuentes renovables y sistemas de almacenamiento. La conexión de estas unidades de generación, que se realiza a través de inversores de alta ...
  • Distributed opportunistic wireless mapping system towards smart city service provision 

    Villadangos Alonso, Jesús Upna Orcid; Falcone Lanas, Francisco Javier Upna Orcid; López Martín, Antonio Upna Orcid; Astrain Escola, José Javier Upna Orcid; Sanchis Gúrpide, Pablo Upna Orcid; Matías Maestro, Ignacio Upna Orcid (IEEE, 2021)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    The knowledge of wireless signal distribution within an urban scenario can provide useful information to users as well as to enhance connectivity and device operation or to perform municipal logistics based on crowd density ...
  • Multichannel refractometer based on lossy mode resonances 

    Fuentes Lorenzo, Omar Upna; Corres Sanz, Jesús María Upna Orcid; Domínguez Rodríguez, Ismel Upna Orcid; Del Villar, Ignacio Upna Orcid; Matías Maestro, Ignacio Upna Orcid (IEEE, 2022)   Artículo / Artikulua
    In this work a new multiparameter sensor platform based on lossy mode resonances is presented. The structure consists of a soda-lime optical slab waveguide butt-coupled to multimode optical fibers. A variable thickness ...
  • The promising combination of thermoelectric generators with IoT technologies for autonomous monitoring systems 

    Garacochea Sáenz, Amaia; Catalán Ros, Leyre Upna Orcid; Casi Satrústegui, Álvaro Upna Orcid; Gubía Villabona, Eugenio Upna Orcid; Astrain Ulibarrena, David Upna Orcid (2019)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    Monitoring stations becomes essential in any volcanic system in the world but, because of their remote location, both the electricity supply and the communications represent a technological challenge. The present work ...
  • Ramp-rate control in large PV plants: battery vs. short-term forecast 

    Marcos Álvarez, Javier Upna Orcid; Parra Laita, Íñigo de la Upna Orcid; Cires Buey, Eulalia; Wang, Guang Chao; García Solano, Miguel Upna Orcid; Marroyo Palomo, Luis Upna Orcid (2018)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    The changeability in the power produced by utility-scale PV plants caused by shadows due to passing clouds can compromise grid stability. Traditionally, some kind of energy storage systems (ESS) is proposed as the solution ...
  • High performance fiber laser resonator for dual band (C and L) sensing 

    Sánchez-González, Arturo; Pérez Herrera, Rosa Ana Upna Orcid; Roldán Varona, Pablo; Rodríguez Cobo, L.; López Higuera, José Miguel; López-Amo Sáinz, Manuel Upna Orcid (IEEE, 2022)   Artículo / Artikulua
    This work presents an experimental analysis and comparison of the performance of quasi-randomly distributed reflectors inscribed into a single-mode fiber as a sensing mirror both in C- and L-band. Single-wavelength emission ...
  • Masked least-squares averaging in processing of scanning-EMG recordings with multiple-discharges 

    Corera Orzanco, Íñigo Upna Orcid; Malanda Trigueros, Armando Upna Orcid; Rodríguez Falces, Javier Upna Orcid; Navallas Irujo, Javier Upna Orcid (Springer, 2020)   Artículo / Artikulua  OpenAccess
    Removing artifacts from nearby motor units is one of the main objectives when processing scanning-EMG recordings. Methods such as median filtering or masked least-squares smoothing (MLSS) can be used to eliminate artifacts ...

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