Recent Submissions

  • 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 ...
  • High-power filter design in waveguide technology: future generation of waveguide satellite filters in payloads handling increasing bit rates and numbers of channels 

    Arregui Padilla, Iván Upna; Teberio Berdún, Fernando Upna; Arnedo Gil, Israel Upna; Percaz Ciriza, Jon Mikel Upna; Martín Iglesias, Petronilo; Lopetegui Beregaña, José María Upna; Gómez Laso, Miguel Ángel Upna (IEEE, 2020)   Artículo / Artikulua
    To design a filter for a particular application, many issues must first be considered. Which technology will be the most convenient? What design technique will provide better results for a particular set of frequency ...
  • Hybrid computational techniques: electromagnetic propagation analysis in complex indoor environments 

    Azpilicueta Fernández de las Heras, Leyre Upna; Falcone Lanas, Francisco Javier Upna; Janaswamy, Ramakrishna (IEEE, 2019)   Artículo / Artikulua  OpenAccess
    In this article, we compare deterministic methodologies for characterizing channel behavior in heterogeneous and composite scenarios. These techniques include one that combines a 3D ray launching (RL) approach based on ...
  • Multimode – coreless – multimode fiber-based sensors: theoretical and experimental study 

    San Fabián García, Noé Upna; Socorro Leránoz, Abián Bentor Upna; Del Villar, Ignacio Upna; Díaz Lucas, Silvia Upna; Matías Maestro, Ignacio Upna (IEEE, 2019)   Artículo / Artikulua  OpenAccess
    This paper presents a complete study on the spectral behavior of a multimode-coreless-multimode fiber-optic structure, as well as its application as a refractometer and a liquid level sensor. The combination of two standard ...
  • Impact of body wearable sensor positions on UWB ranging 

    Otim, Timothy; Bahillo, Alfonso; Díez, Luis E.; López Iturri, Peio Upna; Falcone Lanas, Francisco Javier Upna (IEEE, 2019)   Artículo / Artikulua  OpenAccess
    In recent years, Ultrawideband (UWB) has become a very popular technology for time of flight (TOF) based localization and tracking applications but its human body interactions have not been studied yet extensively. Most ...
  • Programmable retiming of an optical clock signal using the temporal Talbot effect 

    Tainta Ausejo, Santiago Upna; Erro Betrán, María José Upna; Garde Alduncin, María José Upna; Muriel, M. A. (IEEE, 2019)   Artículo / Artikulua
    By using a Fourier processor based on the temporal Talbot effect and the properties of the Discrete Fourier Transform, we propose a scheme that adds an adjustable delay to a train of pulses while simultaneously preserving ...
  • Lossy mode resonance sensors based on nanocoated multimode-coreless-multimode fibre 

    Vicente Gómara, Adrián Upna; Santano, Desiree Upna; Zubiate Orzanco, Pablo Upna; Urrutia Azcona, Aitor Upna; Del Villar, Ignacio Upna; Ruiz Zamarreño, Carlos Upna (Elsevier, 2020)   Artículo / Artikulua
    In this work it is proved the ability to obtain lossy mode resonances (LMRs) in the transmission spectrum with multimode-coreless-multimode fibre optic structure coated with tin oxide on the coreless segment. The devices ...
  • Surface wave reduction in antenna arrays using metasurface inclusion for MIMO and SAR systems 

    Alibakhshikenari, Mohammad; Virdee, Bal S.; See, Chan H.; Abd-Alhameed, Raed; Falcone Lanas, Francisco Javier Upna; Limiti, Ernesto (Advancing Earth and Space Science, 2019)   Artículo / Artikulua  OpenAccess
    An effective method is presented for suppressing mutual coupling between adjacent radiating elements which is based on metasurface isolation for multiple-input multiple-output (MIMO) and synthetic aperture radar (SAR) ...

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