Recent Submissions

  • 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; 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; Santano, Desiree; 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) ...
  • Structural dispersion-based reduction of loss in epsilon-near-zero and surface plasmon polariton waves 

    Li, Yue; Liberal Olleta, Íñigo Upna; Engheta, Nader (American Association for the Advancement of Science, 2019)   Artículo / Artikulua  OpenAccess
    The field of plasmonics has substantially affected the study of light-matter interactions at the subwavelength scale. However, dissipation losses still remain an inevitable obstacle in the development of plasmonic-based ...
  • Hg2+ optical fiber sensor based on LSPR generated by gold nanoparticles embedded in LBL nano-assembled coatings 

    Martínez Hernández, María Elena; Goicoechea Fernández, Javier Upna; Arregui San Martín, Francisco Javier Upna (MDPI, 2019)   Artículo / Artikulua  OpenAccess
    Mercury is an important contaminant since it is accumulated in the body of living beings, and very small concentrations are very dangerous in the long term. This paper reports the fabrication of a highly sensitive fiber ...
  • A radio channel model for D2D communications blocked by single trees in forest environments 

    Picallo Guembe, Imanol; Klaina, Hicham; López Iturri, Peio Upna; Aguirre Gallego, Erik Upna; Celaya Echarri, Mikel; Azpilicueta Fernández de las Heras, Leyre Upna; Eguizábal Garrido, Alejandro; Falcone Lanas, Francisco Javier Upna; Alejos, Ana (MDPI, 2019)   Artículo / Artikulua  OpenAccess
    In this paper we consider the D2D (Device-to-Device) communication taking place between Wireless Sensor Networks (WSN) elements operating in vegetation environments in order to achieve the radio channel characterization ...
  • A model for the transient performance simulation of solar cavity receivers 

    Samanes Pascual, Javier; García-Barberena Labiano, Javier (Elsevier, 2014)   Artículo / Artikulua  OpenAccess
    In this paper, a detailed model for the transient simulation of solar cavity receivers for concentrating solar power plants is presented. The proposed model aims to consider all the major phenomena influencing the performance ...
  • Common-mode and phase-to-ground voltage reduction in back-to-back power converters with discontinuous PWM 

    Samanes Pascual, Javier Upna; Gubía Villabona, Eugenio Upna; Juankorena Saldias, Xabier Upna; Gironés Remírez, Carlos (IEEE, 2020)   Artículo / Artikulua
    Discontinuous space vector pulsewidth modulation (DSVPWM) techniques are an interesting option for three-phase, two-level power converters when efficiency is a key factor. Such is the case of back-to-back (B2B) power ...
  • Control design and stability analysis of power converters: the MIMO generalized bode criterion 

    Samanes Pascual, Javier Upna; Urtasun Erburu, Andoni Upna; Barrios Rípodas, Ernesto Upna; Lumbreras Magallón, David Upna; López Taberna, Jesús; Gubía Villabona, Eugenio Upna; Sanchís Gúrpide, Pablo Upna (IEEE, 2020)   Artículo / Artikulua
    Three-phase dynamic systems and multiphase generators are frequently modeled and controlled in the synchronous reference frame. To properly model the cross-coupling terms in this reference frame, complex vector theory and ...
  • Effects of the body wearable sensor position on the UWB localization accuracy 

    Otim, Timothy; Díez, Luis E.; Bahillo, Alfonso; López Iturri, Peio Upna; Falcone Lanas, Francisco Javier Upna (MDPI, 2019)   Artículo / Artikulua  OpenAccess
    Over the years, several Ultrawideband (UWB) localization systems have been proposed and evaluated for accurate estimation of the position for pedestrians. However, most of them are evaluated for a particular wearable sensor ...
  • Generation of lossy mode resonances with different nanocoatings deposited on coverslips 

    Fuentes Lorenzo, Omar; Goicoechea Fernández, Javier Upna; Corres Sanz, Jesús María Upna; Del Villar, Ignacio Upna; Ozcariz Celaya, Aritz Upna; Matías Maestro, Ignacio Upna (Optical Society of America, 2020)   Artículo / Artikulua  OpenAccess
    The generation of lossy mode resonances (LMRs) with a setup based on lateral incidence of light in coverslips is a simple platform that can be used for sensing. Here the versatility of this platform is proved by studying ...
  • A survey on detection techniques for cryptographic ransomware 

    Berrueta Irigoyen, Eduardo Upna; Morató Osés, Daniel Upna; Magaña Lizarrondo, Eduardo Upna; Izal Azcárate, Mikel Upna (IEEE, 2019)   Artículo / Artikulua  OpenAccess
    Crypto-ransomware is a type of malware that encrypts user files, deletes the original data, and asks for a ransom to recover the hijacked documents. It is a cyber threat that targets both companies and residential users, ...
  • Attention to online channels across the path to purchase: an eye-tracking study 

    Cortiñas Ugalde, Mónica Upna; Cabeza Laguna, Rafael Upna; Chocarro Eguaras, Raquel Upna; Villanueva Larre, Arantxa Upna (Elsevier, 2019)   Artículo / Artikulua
    Currently, consumers display what is known as omnichannel behavior: the combined use of digital and physical channels providing them with multiple points of contact with firms. We combine the stimulus-organism-response (S-O-R) ...
  • A Chebyshev transformer-based microstri-to-groove-gap-waveguide inline transition for MMIC packaging 

    Pérez Escudero, José Manuel Upna; Torres García, Alicia E. Upna; Gonzalo García, Ramón Upna; Ederra Urzainqui, Íñigo Upna (IEEE, 2019)   Artículo / Artikulua  OpenAccess
    The gap waveguide technology has become an alternative to millimeter- and submillimeter-wave electronic circuit packaging thanks to the loss reduction associated with its use. In this paper, a simplified design of an inline ...
  • Etched and nanocoated single-mode multimode single-mode (SMS) fibers for detection of wind turbine gearbox oil degradation 

    Del Villar, Ignacio Upna; Goñi Carnicero, Jaime; Vicente Gómara, Adrián; Arregui San Martín, Francisco Javier Upna; Matías Maestro, Ignacio Upna (IEEE, 2019)   Artículo / Artikulua  OpenAccess
    The application of an etching process in a single-mode multimode single-mode (SMS) fiber allows monitoring the change of refractive index of wind turbine gearbox oil due to temperature and degradation with a limitation at ...
  • Distributed dynamic strain sensing via perfect periodic coherent codes and a polarization diversity receiver 

    Mompó Roselló, Juan José Upna; Shiloh, Lihi; Arbel, Nadav; Levanon, Nadav; Loayssa Lara, Alayn Upna; Eyal, Avishay (IEEE, 2019)   Artículo / Artikulua  OpenAccess
    Rayleigh scattering-based dynamic strain sensing with high spatial resolution, fast update rate, and high sensitivity is highly desired for applications such as structural health monitoring and shape sensing. A key issue ...
  • High-isolation leaky-wave array antenna based on CRLH-metamaterial implemented on SIW with ±30° frequency beam-scanning capability at millimetre-waves 

    Alibakhshikenari, Mohammad; Virdee, Bal S.; See, Chan H.; Abd-Alhameed, Raed; Falcone Lanas, Francisco Javier Upna; Limiti, Ernesto (MDPI, 2019)   Artículo / Artikulua  OpenAccess
    The paper presents a feasibility study on the design of a new metamaterial leaky-wave antenna (MTM-LWA) used in the construction of a 1 × 2 array which is implemented using substrate-integrated waveguide (SIW) technology ...
  • Substrate-integrated photonic doping for near-zero-index devices 

    Zhou, Ziheng; Li, Yue; Li, Hao; Sun, Wangyu; Liberal Olleta, Íñigo Upna; Engheta, Nader (Nature Research, 2019)   Artículo / Artikulua  OpenAccess
    Near-zero-index (NZI) media, a medium with near zero permittivity and/or permeability, exhibits unique wave phenomena and exciting potential for multiple applications. However, previous proof-of-concept realizations of NZI ...
  • Mapping the conductivity of graphene with electrical resistance tomography 

    Cultrera, Alessandro; Serazio, Danilo; Zurutuza, Amaia; Centeno, Alba; Txoperena, Ohiana; Etayo Salinas, David Upna; Cordón, Álvaro; Redo Sánchez, Albert; Arnedo Gil, Israel Upna; Ortolano, Massimo; Callegaro, Luca (Nature Research, 2019)   Artículo / Artikulua  OpenAccess
    Electronic applications of large-area graphene films require rapid and accurate methods to map their electrical properties. Here we present the first electrical resistance tomography (ERT) measurements on large-area graphene ...
  • Fiber-based early diagnosis of venous thromboembolic disease by label-free D-dimer detection 

    Zubiate Orzanco, Pablo Upna; Urrutia Azcona, Aitor Upna; Ruiz Zamarreño, Carlos Upna; Egea Urra, Josune; Fernández Irigoyen, Joaquín; Giannetti, Ambra; Baldini, Francesco; Díaz Lucas, Silvia Upna; Matías Maestro, Ignacio Upna; Arregui San Martín, Francisco Javier Upna; Santamaría, Enrique; Chiavaioli, Francesco; Del Villar, Ignacio Upna (Elsevier, 2019)   Artículo / Artikulua  OpenAccess
    D-dimer is a useful diagnostic biomarker for deep vein thrombosis or pulmonary embolism, collectively referred to as venous thromboembolism (VTE). The ability to detect in real-time the amount of D-dimer with a fast and ...

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