Recent Submissions

  • Silicon-based 0.450-0.475 THz series-fed double dielectric resonator on-chip antenna array based on metamaterial properties for integrated-circuits 

    Alibakhshikenari, Mohammad; Virdee, Bal S.; See, Chan H.; Abd-Alhameed, Raed; Falcone Lanas, Francisco Javier Upna; Limiti, Ernesto (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
    The antenna array designed to operate over 0.450-0.475 Terahertz comprises two dielectric resonators (DRs) that are stacked vertically on top of each other and placed on the surface of the slot antenna fabricated on a ...
  • 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 ...
  • MIMO based decoupling strategy for grid connected power converters controlled in the synchronous reference frame 

    Samanes Pascual, Javier Upna; Gubía Villabona, Eugenio Upna; López Taberna, Jesús (IEEE, 2018)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    Power converters are frequently connected to the grid through a LCL filter, controlling its power transfer through a current control loop in the synchronous reference frame. In this reference frame, cross coupling terms ...
  • Modeling solar cavity receivers: a review and comparison of natural convection heat loss correlations 

    Samanes Pascual, Javier Upna; García-Barberena Labiano, Javier; Zaversky, Fritz (Elsevier, 2015)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    As the main difficulty of modeling cavity receivers is determining natural convection heat losses, this paper presents a survey of the different natural convection correlations developed by several authors to model natural ...
  • 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 ...
  • On the limits of the capacitor-voltage active damping for grid-connected power converters with LCL filter 

    Samanes Pascual, Javier Upna; Gubía Villabona, Eugenio Upna (IEEE, 2018)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    Active damping strategies are widely extended to avoid stability issues at the LCL filter resonant poles in grid-connected voltage source converters. The capacitor voltage derivative active damping effectively damps the ...
  • 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 ...
  • Sensorless active damping strategy for parallel interleaved voltage source power converters with LCL filter 

    Samanes Pascual, Javier Upna; Gubía Villabona, Eugenio Upna (IEEE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    Grid-connected pulse-width modulation converters with LCL filters are widely extended as an interface for renewable energy generating systems. Those filters arise stability issues due to the filter resonance, which, must ...
  • 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, ...
  • Influence of renewable power fluctuations on the lifetime prediction of lithium-ion batteries in a microgrid environment 

    Soto Cabria, Adrián; Berrueta Irigoyen, Alberto Upna; Sanchís Gúrpide, Pablo Upna; Ursúa Rubio, Alfredo Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
    This contribution analyses lifetime estimation errors due to the effect of power fluctuations in lithium-ion batteries connected to microgrids when different time steps are used for the calculations. Usually, not every ...
  • 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) ...
  • Design of a groove gap waveguide to microstrip inline transition 

    Pérez Escudero, José Manuel Upna; Torres García, Alicia E. Upna; Gonzalo García, Ramón Upna; Ederra Urzainqui, Íñigo Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
    In this paper the design of an inline transition between microstrip and groove gap waveguide operating at Wband is presented. The transition consists of two sections: a tapered microstrip line and a Chebyshev transformer. ...
  • Characterization and capacity dispersion of lithium-ion second-life batteries from electric vehicles 

    Braco Sola, Elisa; San Martín Biurrun, Idoia Upna; Sanchís Gúrpide, Pablo Upna; Ursúa Rubio, Alfredo Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
    Nowadays, electric vehicle batteries reutilization is considered such as a feasible alternative to recycling, as it allows to benefit from their remaining energy and to enlarge their lifetime. Stationary applications as ...
  • Effective analysis of secure web response time 

    López Romera, Carlos; Morató Osés, Daniel Upna; Magaña Lizarrondo, Eduardo Upna; Izal Azcárate, Mikel Upna (IEEE, 2019)   Contribución a congreso / Biltzarrerako ekarpena
    The measurement of response time in web based applications is a common task for the evaluation of service responsiveness and the detection of network or server problems. Traffic analysis is the most common strategy for ...

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