Now showing items 382-401 of 572

    • Obteniendo imágenes de sistemas CORPS 

      Gómez, Alfonso; Río Bocio, Carlos del Upna (2006)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      From the previous research inside the Antenna Group of the Public University of Navarra regarding the working principles of the human eye, one of the conclusions was that the reconstructed image in the surface of the ...
    • On the determination of the phase center of gaussian horn antennas 

      Río Bocio, Carlos del Upna; Teniente Vallinas, Jorge Upna; Gonzalo García, Ramón Upna; Sorolla Ayza, Mario Upna (1998)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Gaussian horn antenna designs have experimentally demonstrated excellent performance to produce a very pure Gaussian beam mode with extremely low sidelobes and crosspolarization levels. These results make very attractive ...
    • On the performance of the zoned fishnet metamaterial lens with positive and negative reference phase 

      Pacheco-Peña, Víctor Upna; Minin, Igor V.; Minin, Oleg V.; Beruete Díaz, Miguel Upna (IEEE, 2016)   Artículo / Artikulua  OpenAccess
      In this letter, several converging fishnet metalenses are designed using both the zoning and reference phase techniques. They are engineered with a focal length of 1.5λ0 at the design frequency of 55 GHz (λ0 = 5.45 mm) at ...
    • One-way quasiplanar terahertz absorbers using nonstructured polar dielectric layers 

      Rodríguez Ulibarri, Pablo Upna; Serebryannikov, Andriy E.; Beruete Díaz, Miguel Upna (American Physical Society, 2017)   Artículo / Artikulua  OpenAccess
      A concept of quasiplanar one-way transparent terahertz absorbers made of linear isotropic materials is presented. The resulting structure consists of a homogeneous absorbing layer of polar dielectric, GaAs, a dispersion-free ...
    • Optical fiber bus protection network to multiplex sensors: experimental validation of self-diagnosis 

      Pérez Herrera, Rosa Ana Upna; Urquhart, Paul; Schlüter, Marcel; Díaz Lucas, Silvia Upna; López-Amo Sáinz, Manuel Upna (IEEE, 2012)   Artículo / Artikulua  OpenAccess
      The experimental demonstration of a resilient wavelength division multiplexed (WDM) fiber bus network to interconnect sensors is reported. The network recovers operation after failures and it performs 'self-diagnosis', the ...
    • Optical fiber networks for remote fiber optic sensors 

      Fernández Vallejo, Montserrat Upna; López-Amo Sáinz, Manuel Upna (MDPI, 2012)   Artículo / Artikulua  OpenAccess
      This paper presents an overview of optical fiber sensor networks for remote sensing. Firstly, the state of the art of remote fiber sensor systems has been considered. We have summarized the great evolution of these systems ...
    • Optical fiber sensors based on nanoparticle-embedded coatings 

      Urrutia Azcona, Aitor Upna; Goicoechea Fernández, Javier Upna; Arregui San Martín, Francisco Javier Upna (Hindawi Publishing Corporation, 2015)   Artículo / Artikulua  OpenAccess
      The use of nanoparticles (NPs) in scientific applications has attracted the attention of many researchers in the last few years. The use of NPs can help researchers to tune the physical characteristics of the sensing coating ...
    • Optical fiber sensors based on nanostructured materials for environmental applications 

      Rodríguez Rodríguez, Adolfo Josué (2014)   Tesis doctoral / Doktoretza tesia  OpenAccess
      La contaminación ambiental es la presencia de agentes físicos, químicos o biológicos presentes en el agua, suelo y aire; siendo perjudiciales para la salud de las personas, así como para la vida vegetal y animal. Las ...
    • Optical fibre sensors using graphene-based materials: a review 

      Hernáez Sáenz de Zaitigui, Miguel Upna; Ruiz Zamarreño, Carlos Upna; Melendi Espina, Sonia; Bird, Liam; Mayes, Andrew; Arregui San Martín, Francisco Javier Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
      Graphene and its derivatives have become the most explored materials since Novoselov and Geim (Nobel Prize winners for Physics in 2010) achieved its isolation in 2004. The exceptional properties of graphene have attracted ...
    • Optical power-based interrogation of plasmonic tilted fiber Bragg grating biosensors 

      González Vila, Á.; López Aldaba, Aitor Upna; Kinet, D.; Mégret, P.; López-Amo Sáinz, Manuel Upna; Caucheteur, C. (SPIE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Two interrogation techniques for plasmonic tilted fiber Bragg grating sensors are reported and experimentally tested. Typical interrogation methods are usually based on tracking the wavelength shift of the most sensitive ...
    • Optimal horn antenna design to excite high purity gaussian beam using overmoded waveguides 

      Gonzalo García, Ramón Upna; Río Bocio, Carlos del Upna; Teniente Vallinas, Jorge Upna; Sorolla Ayza, Mario Upna (1996)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, we present an original and optimal multimode horn antenna design to excite the fundamental Gaussian beam from an overmoded waveguide. In particular, we focus the study in overmoded circular corrugated ...
    • Optimization in nanocoated D-shaped optical fiber sensors 

      Del Villar, Ignacio Upna; Zubiate Orzanco, Pablo Upna; Ruiz Zamarreño, Carlos Upna; Arregui San Martín, Francisco Javier Upna; Matías Maestro, Ignacio Upna (Optical Society of America, 2017)   Artículo / Artikulua  OpenAccess
      Nanocoated D-shaped optical fibers have been proven as effective sensors. Here, we show that the full width at half minimum (FWHM) of lossy mode resonance can be reduced by optimizing the nanocoating width, thickness and ...
    • Optimization of a pin surface as a solution to suppress cavity modes in a packaged W-band microstrip receiver 

      Rebollo Mugueta, Ainara Upna; Gonzalo García, Ramón Upna; Ederra Urzainqui, Íñigo Upna (IEEE, 2014)   Artículo / Artikulua  OpenAccess
      A pin surface structure has been used in the upper metal plate of a packaged W-band RF front-end receiver in order to suppress the propagation of unwanted modes. A full parametric analysis of the periodic structure within ...
    • Optimization of sensitivity in long period fiber gratings with overlay deposition 

      Del Villar, Ignacio Upna; Matías Maestro, Ignacio Upna; Arregui San Martín, Francisco Javier Upna; Lalanne, Philippe (Optical Society of America, 2005)   Artículo / Artikulua  OpenAccess
      The deposition of an overlay of higher refractive index than the cladding in a Long Period Fiber Grating (LPFG) permits to improve the sensitivity to ambient refractive index changes in a great manner. When the overlay is ...
    • Optimization of sensors based on multimode interference in single-mode–multimode– single-mode structure 

      Del Villar, Ignacio Upna; Socorro Leránoz, Abián Bentor Upna; Corres Sanz, Jesús María Upna; Arregui San Martín, Francisco Javier Upna; Matías Maestro, Ignacio Upna (IEEE, 2013)   Artículo / Artikulua  OpenAccess
      By coating a single-mode–multimode–single-mode (SMS) structure with a complex refractive index thin-film the central wavelength of the transmission and attenuation bands of the optical spectrum can be shifted. By adequate ...
    • Optimization of the available spectrum of a WDM sensors network using a mode locked laser 

      Fernández Vallejo, Montserrat Upna; Ardanaz, Diego; López-Amo Sáinz, Manuel Upna (IEEE / OSA, 2015)   Artículo / Artikulua  OpenAccess
      This work experimentally proposes a new interrogation method which consists on the combination of the information given by both domains: time and frequency. On the one hand, the sensor information is obtained in the frequency ...
    • Optimized antenna system for low power testing of the quasioptical transmission line at TJ-II experiment 

      Sorolla Ayza, Mario Upna; Río Bocio, Carlos del Upna; Gonzalo García, Ramón Upna; Sánchez Corpas, Alberto Upna; Martín, Romualdo; Fernández, Ángela; Cepero, José R.; Likin, Konstantin M.; Sarksyan, Karen (1996)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper we present a high performance antenna system to carry out low power testing of the main parameters of the quasioptical transmission line system for Electron Cyclotron Resonance Heating (ECRH) at TJ-II ...
    • Optimized feedhorn designs for compact antenna test range at Limoges University 

      Teniente Vallinas, Jorge Upna; Arnaud, Eric; Gonzalo García, Ramón Upna; Río Bocio, Carlos del Upna (IEEE, 2006)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, high technology optimized feedhorn designs are presented. These feedhorns have been designed to improve the quite zone size and behaviour at the Compact Antenna Test Range (CATR) of the Antenna Research ...
    • An optimized method based on digitalized Lissajous curve to determine lifetime of luminescent materials on optical fiber sensors 

      Ridruejo Muro, Adrián; Acha Morrás, Nerea de Upna; Elosúa Aguado, César Upna; Matías Maestro, Ignacio Upna; Arregui San Martín, Francisco Javier Upna (Hindawi Publishing Corporation, 2016)   Artículo / Artikulua  OpenAccess
      A method is proposed to determine lifetime of luminescent emissions based on the phase shift measurement employing the digitalized Lissajous representation: this diagram has been typically used with analogical algorithms, ...
    • Optimized strain long-period fiber grating (LPFG) sensors operating at the dispersion turning point 

      Del Villar, Ignacio Upna; Fuentes Lorenzo, Omar Upna; Chiavaioli, Francesco; Corres Sanz, Jesús María Upna; Matías Maestro, Ignacio Upna (IEEE, 2018)   Artículo / Artikulua  OpenAccess
      Two phenomena for enhancing the sensitivity of longperiod fiber gratings are combined toward an increase of the sensitivity to strain of this type of devices: the dispersion turning point (DTP) and the cladding diameter ...