Now showing items 19-38 of 149

    • Characterization of near-ground radio propagation channel for wireless sensor network with application in smart agriculture 

      Klaina, Hicham; Alejos, Ana; Aghzout, Otman; Falcone Lanas, Francisco Javier Upna (MDPI, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this contribution, we present a narrowband radio channel model for a scenario wherein the radio link operates under near-ground conditions, occurring on a ZigBee wireless sensor networks applied to smart agriculture. ...
    • Characterization of radio propagation channel in urban vehicle to infrastructure environments to support WSNs 

      Granda, Fausto; Azpilicueta Fernández de las Heras, Leyre Upna; Vargas Rosales, César; López Iturri, Peio Upna; Aguirre Gallego, Erik Upna; Astrain Escola, José Javier Upna; Villadangos Alonso, Jesús Upna; Falcone Lanas, Francisco Javier Upna (MDPI, 2016)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Vehicular ad hoc Networks (VANETs) enable vehicles to communicate with each other as well as with roadside units (RSUs). Although there is a significant research effort in radio channel modelling focused in vehicle to ...
    • Choked-gaussian corrugated horn antenna design small global coverage horn antenna for TT&C with extremely low sidelobe level 

      Teniente Vallinas, Jorge Upna; Gonzalo García, Ramón Upna; Río Bocio, Carlos del Upna (2003)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Extremely low sidelobe horn antennas are often required for the actual technology. This type of horn antennas are important to avoid interference with other systems. In this paper we describe a new design implementing a ...
    • Coherently radiating periodic structures (CORPS) and the human eye: working principle 

      Betancourt Quiñones, Diego Upna; Ibáñez Loinaz, Asier; Río Bocio, Carlos del Upna (2005)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper a new philosophy to design antenna systems is presented. It is based on the recently proposed Coherently Radiating Periodic Structures (CORPS). These structures are essentially a periodic structure which ...
    • Coherently radiating periodic structures (CORPS): a step towards high resolution imaging systems? 

      García Esparza, Raúl Upna; Betancourt Quiñones, Diego Upna; Ibáñez Loinaz, Asier; Río Bocio, Carlos del Upna (IEEE, 2005)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The coherently radiating periodic structures (CORPS) uses the existing mutual coupling between the elements of an array to spread horizontally and coherently (in-phase) the complex amplitudes of each active element ...
    • Coherently radiating periodic structures (CORPS): aplicaciones prácticas 

      Ibáñez Loinaz, Asier; Betancourt Quiñones, Diego Upna; Río Bocio, Carlos del Upna (2005)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper some possible applications of the new philosophy to design antenna systems based on the Coherently Radiating Periodic Structures (CORPS) is presented. This principle could allow the designer to simplify ...
    • Comparación entre antenas cónicas corrugadas y antenas gaussianas corrugadas 

      Teniente Vallinas, Jorge Upna; Gonzalo García, Ramón Upna; Río Bocio, Carlos del Upna (2002)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, a study of two equal size corrugated horn antennas; a conical and a gaussian profiled horn antenna (GPHA) has been developed. It will be demonstrated that GPHA´s provide lower sidelobes and wider bandwidths, ...
    • Comparative study of nonparametric and parametric PV models to forecast AC power output of PV plants 

      Almeida, Marcelo Pinho; Muñoz Escribano, Mikel Upna; Parra Laita, Íñigo de la Upna; Perpiñán, Óscar; Narvarte Fernández, Luis (EU PVSEC, 2015)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, a comparison between two approaches to predict the AC power output of PV systems is carried out in terms of forecast performance. Each approach uses one of the two main types of PV modeling, parametric and ...
    • A complete optimization-loop, including feeders, of antenna systems based on reflectors 

      Delgado, D.; Teniente Vallinas, Jorge Upna; Río Bocio, Carlos del Upna; Haro, L. de; Martínez, J.A.; Pino, A.G (IEEE, 2005)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In the design process of a complete antenna system based on reflectors, the feed real performance is usually included once the reflectors have been optimized with an ideal feed. In this paper, the proposal is to include ...
    • Comportamiento de propagacion electromagnetica en el apilamiento de agujeros sublambda y agujeros propagantes 

      Navarro Cía, Miguel Upna; Beruete Díaz, Miguel Upna; Falcone Lanas, Francisco Javier Upna; Campillo, Igor; Sorolla Ayza, Mario Upna (2009)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work, we provide more insight on the physics underlying the transmission through subwavelength hole arrays metaprism by comparing it with propagating hole arrays prism. We show the critical role that the size ...
    • Computation of greatest common divisor for the blind deconvolution of transient impulsive signals 

      Lecumberri Villamediana, Pablo Upna; Gómez Fernández, Marisol Upna; Carlosena García, Alfonso Upna (Universitat Politècnica de Catalunya, 2005)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      We propose a new blind deconvolution method for transient impulsive signals in a single input – multiple output (SIMO) system. The method exploits the data redundancy inherent to SIMO multichannel systems to obtain an ...
    • Conical versus gaussian profiled corrugated horn antennas 

      Teniente Vallinas, Jorge Upna; Gonzalo García, Ramón Upna; Río Bocio, Carlos del Upna (IEEE, 2002)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, a study of two equal size corrugated horn antennas; a conical and a gaussian profiled horn antenna (GPHA) has been developed. It will be demonstrated that GPHA´s provide lower sidelobes and wider ...
    • Consideraciones de paraxialidad en modos gaussianos de orden superior 

      Ruiz de la Cuesta, María Teresa; Río Bocio, Carlos del Upna; Gonzalo García, Ramón Upna; Sorolla Ayza, Mario Upna (1996)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Usually, the gaussian beam modes are assumed to be solutions of the wave equation in the free space. Nevertheless, these modes are obtained supposing some paraxial restrictions. Therefore, we will have to check if our ...
    • Cooperative detection applied to THz imaging cameras 

      Lizarraga Cubillos, Juan Camilo Upna; Betancourt Quiñones, Diego Upna; Río Bocio, Carlos del Upna (2009)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      THz technology for developing imaging systems has recently aroused great interest, mainly due to the large number of applications in which these frequencies can be used: security, vision in hard environments, etc. The ...
    • Corrugated horn antenna noise temperature characterisation for the NRL water vapor millimeter-wave spectrometer project 

      Teniente Vallinas, Jorge Upna; Gómez, R.M.; Maestrojuán Biurrun, Itziar Upna; Rebollo Mugueta, Ainara Upna; Gonzalo García, Ramón Upna; Río Bocio, Carlos del Upna (2011)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper the antenna noise temperature for two different corrugated horn antennas (old model and new model) for NRL WVMS is being characterized. The whole optical system will be simulated with Ticra’s GRASP software, ...
    • A dedicated numerical technique for field simulations of antennas on electromagnetic band-gap substrates 

      Hon, B.P. de; Beurden, M.C. van; Gonzalo García, Ramón Upna; Martínez Pascual, Beatriz Upna; Ederra Urzainqui, Íñigo Upna; Río Bocio, Carlos del Upna; Azcona, L.; Alderman, B.; Huggard, P.G.; Marchand, L.; Maagt, Peter de (2004)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    • Desfasadores para microstrip empleando metamateriales 

      Cantora Álvarez, Alejandro; Gonzalo García, Ramón Upna (2005)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper an application of LH materials at microwave frequencies (10GHz) is presented. A compact quarter-wave impedance transformer is proposed using alternating sections of left handed media (LHM) and conventional ...
    • Design of a multifrequency antenna array with the use of left-handed superstrates 

      Sáenz Sáinz, Elena Upna; Gonzalo García, Ramón Upna; Ederra Urzainqui, Íñigo Upna; Maagt, Peter de (2005)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, the radiation performances of different antenna configuration based on Left-Handed superstrates are presented. First of all, the behaviour of a Left- Handed (LH) unit cell is analysed, showing a resonant ...
    • Design of a planar meta-surface based on dipoles and wires for antenna applications 

      Sáenz Sáinz, Elena Upna; Gonzalo García, Ramón Upna; Ederra Urzainqui, Íñigo Upna; Maagt, Peter de (2006)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, the design of a planar meta-surface based on dipoles and wires is presented. The unit cell is formed by three independent layers, which contain two parallel dipoles and one wire. The behaviour of these ...
    • Design of low-cost smart accelerometers 

      Carlosena García, Alfonso Upna; López Martín, Antonio Upna; Massarotto, Marco Upna; Cruz Blas, Carlos Aristóteles de la Upna; Lecumberri Villamediana, Pablo Upna; Gómez Fernández, Marisol Upna; Pintor Borobia, Jesús María Upna; Gárriz Sanz, Sergio Upna (Universitat Politècnica de Catalunya, 2005)   Artículo / Artikulua  OpenAccess
      The goal of this project is to design a low-cost smart accelerometer, making use of a piezoelectric element as basic sensing material, and adding a mixed-mode conditioning circuit.