Recent Submissions

  • Deterministic propagation modeling for intelligent vehicle communication in smart cities 

    Granda, Fausto; López Iturri, Peio Upna; Aguirre Gallego, Erik Upna; Astrain Escola, José Javier Upna; Medrano Fernández, Pablo; Villadangos Alonso, Jesús Upna; Falcone Lanas, Francisco Javier Upna (MDPI, 2018)   Artículo / Artikulua  OpenAccess
    Vehicular Ad Hoc Networks (VANETs) are envisaged to be a critical building block of Smart Cities and Intelligent Transportation System (ITS) where applications for pollution, congestion reduction, vehicle mobility improvement, ...
  • Fabrication of long period gratings by periodically removing the coating of cladding-etched single mode optical fiber towards optical fiber sensor development 

    Ascorbe Muruzabal, Joaquín Upna; Corres Sanz, Jesús María Upna; Del Villar, Ignacio Upna; Matías Maestro, Ignacio Upna (MDPI, 2018)   Artículo / Artikulua  OpenAccess
    Here, we present a novel method to fabricate long period gratings using standard single mode optical fibers (SMF). These optical devices were fabricated in a three-step process, which consisted of etching the SMF, then ...
  • Meta-surface wall suppression of mutual coupling between microstrip patch antenna arrays for THz-band applications 

    Alibakhshikenari, Mohammad; Virdee, Bal S.; Shukla, Panchamkumar; See, Chan H.; Falcone Lanas, Francisco Javier Upna (EMW Publishing, 2018)   Artículo / Artikulua  OpenAccess
    This paper presents a novel 2D meta-surface wall to increase the isolation between microstrip patch radiators in an antenna array that is operating in the teraherz (THz) band of 139-141 GHz for applications including ...
  • Wavelength converter using a highly Er-doped optical fiber ring laser 

    Pérez Herrera, Rosa Ana Upna; López-Amo Sáinz, Manuel Upna; Rodríguez, Luis; Ventura Rípodas, Daniel; López Higuera, José Miguel (IOP Publishing, 2018)   Artículo / Artikulua  OpenAccess
    This work presents an all-fiber wavelength converter based on a highly Er-doped fiber laser, which has been experimentally demonstrated. Frequencies from several kilohertz up to tens of gigahertz have been investigated. ...
  • Quantum antenna arrays: the role of quantum interference on direction-dependent photon statistics 

    Liberal Olleta, Íñigo Upna; Ederra Urzainqui, Íñigo Upna; Ziolkowski, Richard W. (American Physical Society, 2018)   Artículo / Artikulua  OpenAccess
    We investigate the role of quantum interference phenomena on the characteristics of the fields radiated by an array of quantum emitters. In analogy to, but distinct from, classical outcomes, we demonstrate that the array ...
  • Sliding window averaging in normal and pathological motor unit action potential trains 

    Malanda Trigueros, Armando Upna; Navallas Irujo, Javier Upna; Rodríguez Falces, Javier Upna; Porta Cuéllar, Sonia Upna; Fernández Martínez, Miguel (Elsevier, 2018)   Artículo / Artikulua  OpenAccess
    Objective: To evaluate the performance of a recently proposed motor unit action potential (MUAP) averaging method based on a sliding window, and compare it with relevant published methods in normal and pathological muscles. ...
  • Ultrathin sub-terahertz half-wave plate with high conversion efficiency based on zigzag metasurface 

    Moreno-Peñarrubia, Alexia; Kuznetsov, Sergei A.; Beruete Díaz, Miguel Upna (IEEE, 2020)   Artículo / Artikulua
    In this communication, an ultrathin transmissive half-wave plate (HWP) based on a bi-layered zigzag metasurface operating at the lower frequency edge of the terahertz (THz) spectrum is numerically and experimentally studied. ...
  • Quasi-distributed vibration sensing based on weak reflectors and STFT demodulation 

    Leandro González, Daniel Upna; Zhu, Mengshi; López-Amo Sáinz, Manuel Upna; Muruyama, Hideaki (IEEE, 2020)   Artículo / Artikulua
    In this work, a new system is proposed for quasi-distributed vibration sensing based on the Doppler effect. The setup employs an optical frequency domain reflectometer (OFDR) and an array of weak reflectors. The short-time ...
  • Tripod-loop metasurfaces for terahertz-sensing applications: a comparison 

    Jáuregui-López, Irati Upna; Orazbayev, Bakhtiyar Upna; Pacheco-Peña, Víctor Upna; Beruete Díaz, Miguel Upna (MDPI, 2020)   Artículo / Artikulua  OpenAccess
    The high electric field intensity achieved on the surface of sensors based on metasurfaces (metasensors) makes them an excellent alternative for sensing applications where the volume of the sample to be identified is tiny ...
  • Power efficient simple technique to convert a reset-and-hold into a true-sample-and-hold using an auxiliary output stage 

    Rico Aniles, Héctor Daniel; Ramírez Angulo, Jaime; López Martín, Antonio Upna; González Carvajal, Ramón; Rocha Pérez, José Miguel; Garde Luque, María Pilar Upna (IEEE, 2020)   Artículo / Artikulua  OpenAccess
    A technique to implement true-sample-and-hold circuits that hold the output for almost the entire clock cycle without resetting to zero is introduced, alleviating the slew rate requirement on the op-amp. It is based on a ...
  • A compact wide bandpass filter for satellite communications with improved out-of-band rejection 

    Ahmed, Badiaa Ait; Naghar, Azzeddin; Aghzout, Otman; Vazquez Alejos, Ana; Falcone Lanas, Francisco Javier Upna (AEM, 2020)   Artículo / Artikulua  OpenAccess
    This paper presents a compact C-band bandpass filter with improved out-of-band rejection. It consists of a symmetric three-pole parallel coupled line microstrip loaded with complementary split ring resonators (CSRRs) and ...
  • Enhanced accuracy of breast cancer detection based on UWB compact slotted monopole antennas 

    Amdaouch, Ibtisam; Aghzout, Otman; Naghar, Azzeddin; Vazquez Alejos, Ana; Falcone Lanas, Francisco Javier Upna (AEM, 2019)   Artículo / Artikulua  OpenAccess
    This work presents a new breast tumor detection system based on an omnidirectional microstrip ultra wideband antenna. The localization coordinates of the tumor are studied in detail for better tumor detection. The coordinates ...
  • Design and empirical validation of a Bluetooth 5 fog computing based industrial CPS architecture for intelligent industry 4.0 shipyard workshops 

    Fraga Lamas, Paula; López Iturri, Peio Upna; Celaya Echarri, Mikel; Blanco Novoa, Óscar; Azpilicueta Fernández de las Heras, Leyre Upna; Varela Barbeito, José; Falcone Lanas, Francisco Javier Upna; Fernández Caramés, Tiago M. (IEEE, 2020)   Artículo / Artikulua  OpenAccess
    Navantia, one of largest European shipbuilders, is creating a fog computing based Industrial Cyber-Physical System (ICPS) for monitoring in real-time its pipe workshops in order to track pipes and keep their traceability. ...
  • High-gain metasurface in polyimide on-chip antenna based on CRLH-TL for sub-terahertz integrated circuits 

    Alibakhshikenari, Mohammad; Virdee, Bal S.; See, Chan H.; Abd-Alhameed, Raed; Falcone Lanas, Francisco Javier Upna; Limiti, Ernesto (Nature Research, 2020)   Artículo / Artikulua  OpenAccess
    This paper presents a novel on-chip antenna using standard CMOS-technology based on metasurface implemented on two-layers polyimide substrates with a thickness of 500 μm. The aluminium ground-plane with thickness of 3 μm ...
  • Vertically coupled InP/InGaAsP microring lasers using a single epitaxial growth and singleside lithography 

    García López, Óscar; Thourhout, Dries Van; Verstuyft, Steven; López-Amo Sáinz, Manuel Upna; Baets, Roel; Galarza Galarza, Marko Upna (IEEE, 2020)   Artículo / Artikulua
    The experimental demonstration of vertical microring lasers requiring only one single epitaxial growth and two single-side lithographic steps is presented, in what is the simplest fabrication scheme for such devices published ...
  • Development of an aptamer based luminescent optical fiber sensor for the continuous monitoring of Hg2+ in aqueous media 

    Acha Morrás, Nerea de Upna; Elosúa Aguado, César Upna; Arregui San Martín, Francisco Javier Upna (MDPI, 2020)   Artículo / Artikulua  OpenAccess
    A fluorescent optical fiber sensor for the detection of mercury (Hg2+) ions in aqueous solutions is presented in this work. The sensor was based on a fluorophore-labeled thymine (T)-rich oligodeoxyribonucleotide (ON) ...
  • A combination of a vibrational electromagnetic energy harvester and a giant magnetoimpedance (GMI) sensor 

    Beato López, Juan Jesús Upna; Royo, Isaac Upna; Algueta-Miguel, Jose M. Upna; Gómez Polo, Cristina (MDPI, 2020)   Artículo / Artikulua  OpenAccess
    An energy harvesting device combined with a giant magnetoimpedance (GMI) sensor is presented to analyze low frequency vibrating systems. An electromagnetic harvester based on magnetic levitation is proposed for the electric ...
  • Open repository for the evaluation of ransomware detection tools 

    Berrueta Irigoyen, Eduardo Upna; Morató Osés, Daniel Upna; Magaña Lizarrondo, Eduardo Upna; Izal Azcárate, Mikel Upna (IEEE, 2020)   Artículo / Artikulua  OpenAccess
    Crypto-ransomware is a type of malware that encrypts user files, deletes the original data, and asks for ransom to recover the hijacked documents. Several articles have presented detection techniques for this type of ...
  • Enhanced wireless channel estimation through parametric optimization of hybrid ray launching-collaborative filtering technique 

    Casino, Fran; López Iturri, Peio Upna; Aguirre Gallego, Erik Upna; Azpilicueta Fernández de las Heras, Leyre Upna; Falcone Lanas, Francisco Javier Upna; Solanas, Agusti (IEEE, 2020)   Artículo / Artikulua  OpenAccess
    In this paper, an enhancement of a hybrid simulation technique based on combining collaborative filtering with deterministic 3D ray launching algorithm is proposed. Our approach implements a new methodology of data depuration ...
  • Electric discharge detection and localization using a distributed optical fiber vibration sensor 

    Costa, Igor Brutkowski Vieira da; Weber, Guilherme Heim; Gomes, Danilo Fernandes; Galvão, José Rodolfo; Silva, Marco J. da; Pipa, Daniel R.; Ozcariz Celaya, Aritz Upna; Ruiz Zamarreño, Carlos Upna; Martelli, Cicero; Silva, Jean Carlos Cardozo da (Elsevier, 2020)   Artículo / Artikulua
    Partial discharges are a type of electric discharge that cause localized breakdowns in a small portion of an insulating material without forming a complete rupture. In high power electric machines as well as in transmission ...

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