Recent Submissions

  • 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; 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Discrete IV dG-Choquet integrals with respect to admissible orders 

    Takáč, Zdenko; Uriz Martín, Mikel Xabier Upna Orcid; Galar Idoate, Mikel Upna Orcid; Paternain Dallo, Daniel Upna Orcid; Bustince Sola, Humberto Upna Orcid (Elsevier, 2021)   Artículo / Artikulua
    In this work, we introduce the notion of dG-Choquet integral, which generalizes the discrete Choquet integral replacing, in the first place, the difference between inputs represented by closed subintervals of the unit ...
  • Non-invasive aging analysis of lithium-ion batteries in extreme cold temperatures 

    Soto Cabria, Adrián Upna Orcid; Berrueta Irigoyen, Alberto Upna Orcid; Oficialdegui, Ignacio; Sanchis Gúrpide, Pablo Upna Orcid; Ursúa Rubio, Alfredo Upna Orcid (IEEE, 2021)   Artículo / Artikulua  OpenAccess
    This paper presents a non-invasive technical analysis of the degra-dation of four lithium-ion batteries (LIBs) used in extreme frigid weather. In contrast to other studies in which the batteries were tested in laboratory ...
  • Phase noise effects on phase-sensitive OTDR sensors using optical pulse compression 

    Loayssa Lara, Alayn; Sagüés García, Mikel Upna Orcid; Eyal, Avishay (IEEE, 2021)   Artículo / Artikulua
    We introduce a detailed theoretical, numerical, and experimental study of the effects of laser's phase noise on the performance of phase-sensitive optical time-domain reflectometry (-OTDR) sensors that use optical pulse ...
  • Novel concentric hexagonal-shaped RFID tag antenna with T-shaped stub matching 

    Alibakhshikenari, Mohammad; Virdee, Bal S.; Althuwayb, Ayman Abdulhadi; Xu, Kai-Da; See, Chan H.; Khan, Salahuddin; Park, Ikmo; Falcone Lanas, Francisco Javier Upna Orcid; Limiti, Ernesto (IEEE, 2021)   Artículo / Artikulua
    This paper presents a unique concentric hexagonal-shaped ring antenna for radio frequency identification (RFID) tags. The rings are excited with a common microstrip feedline. The radiation characteristics of the antenna ...
  • A decomposition approach to cyclostratigraphic signal processing 

    Wouters, Sebastien; Crucifix, Michel; Sinnesael, Matthias; Silva, Anne-Christine da; Zeeden, Christian; Zivanovic, Miroslav Upna Orcid; Boulvain, Frédéric; Devleeschouwer, Xabier (Elsevier, 2022)   Artículo / Artikulua
    Sedimentary rocks can record signals produced byhighly complex processes. These signals are generated by a progressive deposition of sediments which can be affected, mainly through the climate system, by regular astronomical ...
  • Dual voltage-current control to provide grid-forming inverters with current limiting capability 

    Erdocia Zabala, Ioseba Upna; Urtasun Erburu, Andoni Upna Orcid; Marroyo Palomo, Luis Upna Orcid (IEEE, 2021)   Artículo / Artikulua
    The rapid uptake of renewable energy sources is causing synchronous generators (SG) to be replaced by power electronic inverters meaning these inverters need to offer the characteristics traditionally associated with SG. ...
  • Microdrilled tapers to enhance optical fiber lasers for sensing 

    Pérez Herrera, Rosa Ana Upna Orcid; Bravo Acha, Mikel Upna Orcid; Roldán Varona, Pablo; Leandro González, Daniel Upna Orcid; Rodríguez Cobo, L.; López Higuera, José Miguel; López-Amo Sáinz, Manuel Upna Orcid (Nature Research, 2021)   Artículo / Artikulua  OpenAccess
    In this work, an experimental analysis of the performance of different types of quasi-randomly distributed reflectors inscribed into a single-mode fiber as a sensing mirror is presented. These artificially-controlled ...
  • Modeling of a droop-controlled grid-connected DFIG wind turbine 

    Oraá Iribarren, Iker; Samanes Pascual, Javier Upna Orcid; López Taberna, Jesús; Gubía Villabona, Eugenio Upna Orcid (IEEE, 2022)   Artículo / Artikulua  OpenAccess
    Traditionally, to characterize the response of droop-controlled systems RMS models have been used. However, as it is demonstrated in this work, when droop control is applied to doubly-fed induction generators, RMS models ...
  • Light propagation and magnon-photon coupling in optically dispersive magnetic media 

    Bittencourt, V.A.S.V.; Liberal Olleta, Íñigo Upna Orcid; Viola Kusminskiy, Silvia (American Physical Society, 2022)   Artículo / Artikulua  OpenAccess
    Achieving strong coupling between light and matter excitations in hybrid systems is a benchmark for the implementation of quantum technologies. We recently proposed (Bittencourt, Liberal, and Viola-Kusminskiy, arXiv:2110.02984) ...
  • Sarcolemmal excitability, M-Wave changes, and conduction velocity during a sustained low-force contraction 

    Rodríguez Falces, Javier Upna Orcid; Place, Nicolas (Frontiers Media, 2021)   Artículo / Artikulua  OpenAccess
    This study was undertaken to investigate whether sarcolemmal excitability is impaired during a sustained low-force contraction [10% maximal voluntary contraction (MVC)] by assessing muscle conduction velocity and also by ...
  • Towards environmental RF-EMF assessment of mmwave high-node density complex heterogeneous environments 

    Celaya Echarri, Mikel; Azpilicueta Fernández de las Heras, Leyre Upna Orcid; Rodríguez Corbo, Fidel Alejandro; López Iturri, Peio Upna Orcid; Ramos González, Victoria; Alibakhshikenari, Mohammad; Shubair, Raed M.; Falcone Lanas, Francisco Javier Upna Orcid (MDPI, 2021)   Artículo / Artikulua  OpenAccess
    The densification of multiple wireless communication systems that coexist nowadays, as well as the 5G new generation cellular systems advent towards the millimeter wave (mmWave) frequency range, give rise to complex ...
  • Data-driven generation of synthetic wind speeds: a comparative study 

    D'Ambrosio, Daniel; Schoukens, Johan; Troyer, T. De; Zivanovic, Miroslav Upna Orcid; Runacres, Mark (Wiley, 2022)   Artículo / Artikulua  OpenAccess
    The increasing sophistication of wind turbine design and control generates a need for high-quality wind data. The relatively limited set of available measured wind data may be extended with computer generated data, for ...
  • Experimental demonstration of deeply subwavelength dielectric sensing with epsilon-near-zero (ENZ) waveguides 

    Beruete Díaz, Miguel Upna Orcid; Engheta, Nader; Pacheco-Peña, Víctor Upna Orcid (American Institute of Physics, 2022)   Artículo / Artikulua  OpenAccess
    In this Letter, an all metallic sensor based on ε-near-zero (ENZ) metamaterials is studied both numerically and experimentally when working at microwave frequencies. To emulate an ENZ medium, a sensor is made by using a ...
  • Twin lossy mode resonance on a single D-shaped optical fiber 

    Imas González, José Javier Upna Orcid; Ruiz Zamarreño, Carlos Upna Orcid; Del Villar, Ignacio Upna Orcid; Pérez Escudero, José Manuel Upna Orcid; Matías Maestro, Ignacio Upna Orcid (Optica, 2021)   Artículo / Artikulua
    This letter presents the fabrication of dual lossy mode resonance (LMR) refractometers based on titanium dioxide (TiO2) and tin oxide (SnO2) thin films deposited on a single side-polished D-shaped optical fiber. For the ...

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