• Enhancement of the power radiated by a dipole antenna at boresight by means of a left handed superstrate 

      Sáenz Sáinz, Elena Upna; Ederra Urzainqui, Íñigo Upna; Gonzalo García, Ramón Upna; Maagt, Peter de (IEEE, 2006)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper a comparison between the measured radiation performances of a single dipole and a dipole with a left handed superstrate based on a finite periodic repetition of a unit cell is presented. First of all the ...
    • Estado del arte de las antenas que combinan corrugaciones horizontales y verticales 

      Teniente Vallinas, Jorge Upna; Gonzalo García, Ramón Upna; Río Bocio, Carlos del Upna (2005)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In the present paper the state of the art, possibilities, advantages and disadvantages of the patented corrugated horn antennas that combine horizontal and vertical corrugations is being covered. These rather new type and ...
    • Estudio de la posibilidad de utilizar modos de orden superior en guías de onda cuasi-ópticas 

      Río Bocio, Carlos del Upna; Gonzalo García, Ramón Upna; Marín Pilz, Miguel Upna; Sorolla Ayza, Mario Upna; Möbius, Arnold; Thumm, Manfred (1995)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The possibility to employ low power gyrotron tubes (10-30 kW, CW) at millimeter wave frequencies (30-100 GHz) has potential applications in advanced ceramic sintering, surface coating, radar, remote sensing, etc.. In ...
    • Estudio de resonancias parásitas en antenas corrugadas 

      Teniente Vallinas, Jorge Upna; Gonzalo García, Ramón Upna; Río Bocio, Carlos del Upna (2001)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A theoretical study reinforced with practical measurements about the origin of the return loss spikes in corrugated horn antennas is presented in this paper. These spikes are directly related to the periodic structure ...
    • Etched and nanocoated SMS fiber sensor for detection of salinity concentration 

      Cardona-Maya, Yamile; Del Villar, Ignacio Upna; Socorro Leránoz, Abián Bentor Upna; Corres Sanz, Jesús María Upna; Arregui San Martín, Francisco Javier Upna; Botero-Cadavid, Juan F. (MDPI, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      An optical fibre refractometer has been developed by etching and deposition of a thin film of indium tin oxide (ITO) on a single-mode-multimode-single-mode (SMS) fibre structure. The interference between modes in this ...
    • Evalución de dosimetría de campos electromagnéticos en el entorno interior doméstico 

      Esparza Alfaro, Fermín Upna; Carranza, Noemí; Torres Landívar, Víctor Upna; Falcone Lanas, Francisco Javier Upna; Ramos González, Victoria (2009)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work, the evaluation of radiofrequency exposure in a domestic environment is analyzed. 3D raytracing simulation results are compared with dossimetry measurement results in a probe household in a dense urban area ...
    • Experimental study of the antenna influence in RTLS based-on RFID 

      Crespo López, Gonzalo Upna; Teniente Vallinas, Jorge Upna; Ederra Urzainqui, Íñigo Upna; Gonzalo García, Ramón Upna (IEEE, 2012)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Nowadays Real-time localization systems (RTLS) are growing up very quickly but there are some remaining issues which need to be analyzed. This paper presents an experimental study that shows how different kind of antennas can ...
    • Fiber-optic lossy mode resonance sensors 

      Arregui San Martín, Francisco Javier Upna; Del Villar, Ignacio Upna; Corres Sanz, Jesús María Upna; Goicoechea Fernández, Javier Upna; Ruiz Zamarreño, Carlos Upna; Elosúa Aguado, César Upna; Hernáez Sáenz de Zaitigui, Miguel Upna; Rivero Fuente, Pedro José Upna; Socorro Leránoz, Abián Bentor Upna; Urrutia Azcona, Aitor Upna; Sánchez Zábal, Pedro Upna; Zubiate Orzanco, Pablo Upna; López Torres, Diego Upna; Acha Morrás, Nerea de Upna; Matías Maestro, Ignacio Upna (Elsevier, 2014)   Contribución a Congreso / Biltzarrerako ekarpena  OpenAccess
      In the last 4 years, experimental evidences about the potential use of optical sensors based on Lossy Mode Resonances (LMR) have been presented in the literature. These LMR sensors have some similarities with Surface ...
    • Gain dependence of measured spectra in coherent Brillouin optical time-domain analysis sensors 

      Mariñelarena Ollacarizqueta, Jon Upna; Urricelqui Polvorinos, Javier Upna; Loayssa Lara, Alayn Upna (SPIE, 2016)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      We report on the effects of large pump pulse powers on Brillouin optical time-domain analysis (BOTDA) sensors based on phase-modulated probe wave and coherent detection. It is found that the large Brillouin gain that comes ...
    • Gaussian beam propagation versus Huygens method in non-paraxial conditions 

      Gonzalo García, Ramón Upna; Turullols, Pedro; Río Bocio, Carlos del Upna; Sorolla Ayza, Mario Upna (1997)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, we present a study about the difference between Gaussian beam propagation and Huygens method to obtain the radiation pattern in the case of non-paraxial conditions. We fix a way to determine the error in the ...
    • Gaussian profiled horn antennas 

      Gonzalo García, Ramón Upna; Teniente Vallinas, Jorge Upna; Río Bocio, Carlos del Upna (1999)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In many different applications parameters such efficiency, gain, directivity, etc., are really critical. By using the Gaussian techniques presented here, the radiating features of existing horn antenna systems can be ...
    • Generación del modo HE11 a partir de una guía circular lisa monomodo 

      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 taper design to obtain the HE11 corrugated circular waveguide mode exciting with a pure TE11 monomode smooth circular waveguide mode. The proposed corrugated taper has a longitudinal ...
    • A general beam-forming network made with CORPS 

      Betancourt Quiñones, Diego Upna; Río Bocio, Carlos del Upna (2006)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A new beam-forming network concept is introduced. This network is based in the design principles of CORPS. The new proposed structure presents an improvement in design over the traditional beam-forming network since, ...
    • Generation of the HE11 mode from monomode smooth circular waveguide 

      Gonzalo García, Ramón Upna; Río Bocio, Carlos del Upna; Sorolla Ayza, Mario Upna (1996)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, we present an original taper design to obtain the HE11 corrugated circular waveguide mode exciting with a pure TE11 monomode smooth circular waveguide mode. The proposed corrugated taper has a longitudinal ...
    • Generation of the HE11 mode in rectangular waveguide using gaussian techniques 

      Teniente Vallinas, Jorge Upna; Gonzalo García, Ramón Upna; Sorolla Ayza, Mario Upna; Río Bocio, Carlos del Upna (IEEE, 1999)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A new and efficient design of a rectangular corrugated waveguide mode converter, from TE10 mode in a smooth rectangular monomode waveguide to HE11 mode in a corrugated rectangular waveguide, is proposed. The main idea ...
    • Glottal spectrum based inverse filtering 

      Arroabarren Alemán, Ixone Upna; Carlosena García, Alfonso Upna (ISCA, 2003)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper a new inverse filtering technique for the time-domain estimation of the glottal excitation is presented. This approach uses the DAP modeling for the vocal tract characterization, and a spectral model for the ...
    • High efficient dipole antennas by using left-handed superstrates 

      Sáenz Sáinz, Elena Upna; Gonzalo García, Ramón Upna; Ederra Urzainqui, Íñigo Upna; Maagt, Peter de (2004)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      This paper deals with pass band properties of Left Handed Media (LHM) to enhance dipole antenna performances. The LHM properties have been used in order to make high directivity antennas with good return loss features. The ...
    • High order mode beam waveguide for technological medium power millimeter wave applications 

      Río Bocio, Carlos del Upna; Gonzalo García, Ramón Upna; Marín Pilz, Miguel Upna; Sorolla Ayza, Mario Upna; Möbius, Arnold; Thumm, Manfred (1995)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The use of medium power millimeter wave CW gyrotrons (10- 30 kW and 30-100 GHz) has several potential applications in advanced materials processing. Since a stochastic field distribution in the applicator is desirable ...
    • High-order PLL design with constant phase margin 

      Ugarte Gil, Mikel Upna; Carlosena García, Alfonso Upna (IEEE, 2010)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper we describe a novel procedure to design high-type high-order Phase Locked Loops (PLLs) from lower order prototypes, preserving a prescribed Phase Margin (PM). The method builds on a model recently proposed ...
    • Horn antenna lens for multi-beam applications 

      Lizarraga Cubillos, Juan Camilo Upna; Río Bocio, Carlos del Upna (2010)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A spherical discrete lens antenna based on the back-toback combination of two choked-horn antennae arrays interconnected through smooth waveguides sections implementing the spherical phasing law, has been designed, simulated ...