Now showing items 1-20 of 267

    • Silicon integrated subharmonic mixer on a photonic-crystal platform 

      Torres García, Alicia E. Upna Orcid; Pérez Escudero, José Manuel Upna Orcid; Teniente Vallinas, Jorge Upna Orcid; Gonzalo García, Ramón Upna Orcid; Ederra Urzainqui, Íñigo Upna Orcid (IEEE, 2021)   Artículo / Artikulua
      This paper presents a planar silicon integrated subharmonic mixer on top of a photonic-crystal platform. The local oscillator (LO) power is injected through a 2D photoniccrystal (PC) slab to a resonant cavity that effectively ...
    • Energy-efficient amplifiers based on quasi-floating gate techniques 

      López Martín, Antonio Upna; Garde Luque, María Pilar Upna; Algueta-Miguel, Jose M. Upna; Beloso Legarra, Javier; González Carvajal, Ramón; Ramírez-Angulo, Jaime (MDPI, 2021)   Artículo / Artikulua  OpenAccess
      Energy efficiency is a key requirement in the design of amplifiers for modern wireless applica-tions. The use of quasi-floating gate (QFG) transistors is a very convenient approach to achieve such energy efficiency. We ...
    • Super-gain-boosted AB-AB fully differential Miller op-amp with 156dB open-loop gain and 174MV/V MHZ pF/uW figure of merit in 130nm CMOS technology 

      Paul, Anindita; Ramírez-Angulo, Jaime; Díaz Sánchez, Alejandro; López Martín, Antonio Upna; González Carvajal, Ramón; Li, Frank X. (IEEE, 2021)   Artículo / Artikulua  OpenAccess
      A fully differential Miller op-amp with a composite input stage using resistive local common-mode feedback and regulated cascode transistors is presented here. High gain pseudo-differential auxiliary amplifiers are used ...
    • Propagation models in vehicular communications 

      Rodríguez Corbo, Fidel Alejandro; Azpilicueta Fernández de las Heras, Leyre; Celaya Echarri, Mikel; Vázquez Alejos, Ana; Falcone Lanas, Francisco Javier (IEEE, 2021)   Artículo / Artikulua  OpenAccess
      In the advent of becoming reality, the era of autonomous vehicles is closer than ever, and with it, the need for faster and reliable wireless connections. The propagation channel determines the performance limits of wireless ...
    • Hybrid Raman‑erbium random fiber laser with a half open cavity assisted by artificially controlled backscattering fiber refectors 

      Pérez Herrera, Rosa Ana Upna Orcid; Roldán Varona, Pablo; Sañudo-Lasagabaster Ibáñez, Silvia; Rodríguez Cobo, L.; López Higuera, José Miguel; López-Amo Sáinz, Manuel Upna Orcid (Springer Nature, 2021)   Artículo / Artikulua  OpenAccess
      A hybrid Raman-erbium random fber laser with a half-open cavity assisted by chirped artifcially controlled backscattering fber refectors is presented. A combination of a 2.4 km-long dispersion compensating fber with two ...
    • Liquid level sensor based on dynamic Fabry–Perot interferometers in processed capillary fiber 

      Roldán Varona, Pablo; Pérez Herrera, Rosa Ana Upna Orcid; Rodríguez Cobo, L.; Reyes González, Luis; López-Amo Sáinz, Manuel Upna Orcid (Springer Nature, 2021)   Artículo / Artikulua  OpenAccess
      In this work, a novel optical fiber sensor capable of measuring both the liquid level and its refractive index is designed, manufactured and demonstrated through simulations and experimentally. For this, a silica capillary ...
    • Metageometries for polycyclic aromatic hydrocarbons detection at THz range in food systems 

      Jáuregui López, Irati Upna Orcid; Insausti Barrenetxea, Kizkitza Upna Orcid; Beriain Apesteguía, María José Upna Orcid; Beruete Díaz, Miguel Upna Orcid (IEEE, 2021)   Artículo / Artikulua
      Polycyclic aromatic hydrocarbons, when present in food systems, have been shown to have a detrimental effect on human health, producing carcinogenic elements. So, the implementation of processes for their detection and ...
    • On the reduction of authoritative DNS cache timeouts: detection and implications for user privacy 

      Hernández Quintanilla, Tomás; Magaña Lizarrondo, Eduardo Upna Orcid; Morató Osés, Daniel Upna Orcid; Izal Azcárate, Mikel Upna Orcid (Elsevier, 2021)   Artículo / Artikulua  OpenAccess
      The domain name system (DNS) is an Internet network service that is used by hosts to resolve IP addresses from symbolic names. This basic service has been attacked and abused many times, as it is one of the oldest and most ...
    • Urban e-grocery distribution design in Pamplona (Spain) applying an agent-based simulation model with horizontal cooperation scenarios 

      Serrano Hernández, Adrián; Torre, Rocío de la; Cadarso, Luis; Faulín Fajardo, Javier (MDPI, 2021)   Artículo / Artikulua  OpenAccess
      E-commerce has boosted in the last decades because of the achievements of the information and telecommunications technology along with the changes in the society life-style. More recently, the groceries online purchase (or ...
    • Design and experimental validation of an augmented reality system with wireless integration for context aware enhanced show experience in auditoriums 

      Picallo Guembe, Imanol; Vidal Balea, A.; Blanco Novoa, Óscar; López Iturri, Peio; Fraga Lamas, Paula; Azpilicueta Fernández de las Heras, Leyre; Falcone Lanas, Francisco Javier; Fernández Caramés, Tiago M.; Klaina, Hicham (IEEE, 2021)   Artículo / Artikulua  OpenAccess
      The development of multiple cultural and social related activities, such as shows related with the performing arts, conferences or presentations rely on facilities such as auditoriums, theatres and conference sites, which ...
    • Study on on-chip antenna design based on metamaterial-inspired and substrate-integrated waveguide properties for millimetre-wave and THz integrated-circuit applications 

      Alibakhshikenari, Mohammad; Virdee, Bal S.; Althuwayb, Ayman Abdulhadi; Aïssa, Sonia; See, Chan H.; Abd-Alhameed, Raed; Falcone Lanas, Francisco Javier Upna Orcid; Limiti, Ernesto (Springer, 2021)   Artículo / Artikulua  OpenAccess
      This paper presents the results of a study on improving the performance parameters such as the impedance bandwidth, radiation gain and efficiency, as well as suppressing substrate loss of an innovative antenna for on-chip ...
    • Multiparameter sensor based on a multiinterferometric serial configuration for temperature and strain measurements 

      Pérez Herrera, Rosa Ana Upna Orcid; Bravo Acha, Mikel Upna Orcid; Leandro González, Daniel Upna Orcid; Novais, Susana; Pradas Martínez, Javier; López-Amo Sáinz, Manuel Upna Orcid (IEEE, 2021)   Artículo / Artikulua
      In this work, a multi-parameter point sensor based on the combination of Fabry-Perot (FP) and the anti-resonant (AR) reflecting guidance in cascade configuration is proposed and experimentally demonstrated. This structure, ...
    • Ultrathin and high-efficiency Pancharatnam-Berry phase metalens for millimeter waves 

      Moreno-Peñarrubia, Alexia; Teniente Vallinas, Jorge; Kuznetsov, Sergei A.; Orazbayev, Bakhtiyar; Beruete Díaz, Miguel (AIP Publishing, 2021)   Artículo / Artikulua  OpenAccess
      Applying the Pancharatnam–Berry (PB) principle to half-wave plate (HWP) metasurfaces allows the manipulation of wavefronts along with the conversion of the handedness of circularly polarized incident waves by simply rotating ...
    • Bull’s-eye antenna with circular polarization at millimeter waves based on ridge gap waveguide technology 

      Pérez, Dayan Upna Orcid; Ederra Urzainqui, Íñigo Upna Orcid; Beruete Díaz, Miguel Upna Orcid (IEEE, 2021)   Artículo / Artikulua
      In this communication, a Bull’s-Eye (BE) antenna with circular polarization (CP) based on ridge gap waveguide (RGW) technology is numerically and experimentally demonstrated. The structure is excited from the bottom with ...
    • Proposal and evaluation of typical illuminance year (TIY) generation procedures from illuminance or irradiance data for daylight assessment in the long term 

      García Ruiz, Ignacio Upna Orcid; Blas Corral, María Ángeles de Upna Orcid; Torres Escribano, José Luis Upna Orcid (ElsevierInternational Solar Energy Society, 2020)   Artículo / Artikulua
      When assessing the long-term daylight availability or the performance of natural lighting systems in a given location, it is necessary to have representative data of local daylight conditions. The use of a daylight test ...
    • Towards sub-meter level UWB indoor localization using body wearable sensors 

      Otim, Timothy; Bahillo, Alfonso; Enrique Díez, Luis; López Iturri, Peio; Falcone Lanas, Francisco Javier (IEEE, 2020)   Artículo / Artikulua  OpenAccess
      Thanks to its ability to provide sub-meter level positioning accuracy, Ultrawideband (UWB) has found wide use in several wireless body area network (WBAN) applications such as ambient assisted living, remote patient ...
    • Sub-synchronous resonance damping control strategy for DFIG wind turbines 

      Samanes Pascual, Javier; Gubía Villabona, Eugenio; López Taberna, Jesús; Burgos, Rolando (IEEE, 2020)   Artículo / Artikulua  OpenAccess
      Doubly-fed induction generator (DFIG) wind turbines connected to capacitive series-compensated transmission lines are prone to exhibit oscillatory behavior. The phenomena is called sub-synchronous resonances (SSRs), as ...
    • Straightforward nano patterning on optical fiber for sensors development 

      Acha Morrás, Nerea de Upna Orcid; Elia Lorente, Victor Upna; Delgado Camón, Arantzazu Upna; Arregui San Martín, Francisco Javier Upna Orcid; Elosúa Aguado, César Upna Orcid (Optical Society of America, 2020)   Artículo / Artikulua  OpenAccess
      A simple method to prepare a nano pattern along the surface of an optical fiber is applied in this Letter to develop a pH sensor. The template is made of a block copolymer that defines specific locations where gold nano ...
    • Sulphate soil stabilisation with magnesium binders for road subgrade construction 

      Seco Meneses, Andrés Upna Orcid; Castillo, Jesús María del Upna Orcid; Espuelas Zuazu, Sandra Upna Orcid; Marcelino Sádaba, Sara Upna Orcid; García, Beñat (Taylor and Francis, 2020)   Artículo / Artikulua
      This paper analyzes the ability of magnesium oxide-based additives to stabilise a low bearing gypsum marly soil, in order to reach subgrade requirements. This soil was not adequate for stabilisation with lime or cement ...
    • Improving the width of lossy mode resonances in a reflection configuration D-shaped fiber by nanocoating laser ablation 

      Fuentes Lorenzo, Omar Upna; Vaiano, Patrizio; Del Villar, Ignacio Upna Orcid; Corres Sanz, Jesús María Upna Orcid; Matías Maestro, Ignacio Upna Orcid (Optical Society of America, 2020)   Artículo / Artikulua
      The full width at half maximum (FWHM) of lossy mode resonances (LMRs) in the optical spectrum depends on the homogeneity of the thin film deposited. In this Letter, a method for improving the FWHM is applied for an LMR ...