• New analytical method to design filters by combining the periodic and resonant filtering effects of EBG cells 

      Ibáñez Loinaz, Asier; Río Bocio, Carlos del Upna (IEEE, 2005)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper a new analytical method to design stop-band filters combining the Bragg and resonant effects is presented. A rigorous consideration of the EBG structures filtering effect at the microwave frequency range ...
    • New approach to the design of corrugated horn antennas 

      Gonzalo García, Ramón Upna; Teniente Vallinas, Jorge Upna; Río Bocio, Carlos del Upna; Sorolla Ayza, Mario Upna (1997)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, we present two new corrugated horn antenna designs in circular waveguide. The first one is a converter horn antenna from monomode circular waveguide TE11 to corrugated waveguide HE11 mode in a very efficient ...
    • New regimes to achieve enhanced transmission through subwavelength hole arrays 

      Navarro Cía, Miguel Upna; Beruete Díaz, Miguel Upna; Sorolla Ayza, Mario Upna (2011)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this communication we present millimetre- and THz-waves experimental confirmation of enhanced transmission through subwavelength hole arrays with rectangular lattice when the incident electric field is parallel to ...
    • A novel design method for phase-locked loops of any order and type 

      Carlosena García, Alfonso Upna; Mànuel Lázaro, Antonio (IEEE, 2006)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper a novel approach to the design of PLLs is presented, which can be used regardless of their Order and Type. The method stems from the fact that high-frequency poles in the loop filter determine filtering ...
    • A novel PLL architecture 

      Osa, Juan I.; Carlosena García, Alfonso Upna; López Martín, Antonio Upna (2000)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A novel phase-locked loop scheme is proposed in this paper, whose main distinguishing features are infinite hold-in range, pull-out range fractionally constant and also a ripple fractionally constant. To this end, it ...
    • Nuevas consideraciones al diseño de conversores de modos TE0m-TE0n para aplicaciones de alta potencia a frecuencias milimétricas 

      Río Bocio, Carlos del Upna; Gonzalo García, Ramón Upna; Sorolla Ayza, Mario Upna (1996)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work, the new results of a study about the general Kovalev’s coherence principle are presented. As we will show here, despite Kovalev presents the coherence principle as general, only the fundamental case can be ...
    • Nuevas técnicas para el diseño de antenas de bocina corrugadas 

      Teniente Vallinas, Jorge Upna; Gonzalo García, Ramón Upna; Río Bocio, Carlos del Upna (2004)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The present paper deals with the design of modern corrugated horn antennas for extremely low sidelobe level with the use of the well known corrugated Gaussian Profiled Horn Antenna (corrugated GPHA’s) to improve the radiation ...
    • 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 ...
    • 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 ...
    • 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 ...
    • Optimum horn antennas for high order mode beam waveguides 

      Río Bocio, Carlos del Upna; Gonzalo García, Ramón Upna; Sorolla Ayza, Mario Upna; Thumm, Manfred (1995)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Higher order free space modes can be considered as serious candidates for power millimeter wave transmission in advanced material processing by using medium power CW gyrotrons. These modes can be propagated in a beam ...
    • Overcoming non-local effects and Brillouin threshold limitations in Brillouin distributed sensors 

      Urricelqui Polvorinos, Javier Upna; Ruiz Lombera, Rubén; Sagüés García, Mikel Upna; Mirapeix, Jesús; López Higuera, José Miguel; Loayssa Lara, Alayn Upna (SPIE, 2015)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      We demonstrate, for the first time to our knowledge, a Brillouin optical time domain analysis sensor that is able to operate with a probe power larger than the Brillouin threshold of the deployed sensing fiber and that ...
    • Parametric study of pin surface used to suppress undesired modes in a packaged W-band microstrip receiver 

      Rebollo Mugueta, Ainara Upna; Maestrojuán Biurrun, Itziar Upna; Larumbe Gonzalo, Belén Upna; Gonzalo García, Ramón Upna; Ederra Urzainqui, Íñigo Upna (IEEE, 2013)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A pin surface structure has been used in order to suppress undesired modes in a packaged W-band RF front-end receiver. A parametric analysis has been carried out in order to determine the optimum dimensions. Resonances ...
    • Paraxiality considerations of higher order gaussian modes 

      Río Bocio, Carlos del Upna; Gonzalo García, Ramón Upna; Sorolla Ayza, Mario Upna (1996)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Frequently, gaussian modes are used as free space wave equation solutions. This is not true since they are obtained assuming certain paraxial character in them. In this paper, we present an original study of the condition ...
    • Phase-shift based BOTDA measurements tolerant to non-local effects 

      Urricelqui Polvorinos, Javier Upna; Sagüés García, Mikel Upna; Loayssa Lara, Alayn Upna (SPIE, 2013)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      We demonstrate a BOTDA sensor based on the use of the Brillouin phase shift that performs measurements tolerant to non local effects. This technique raises opportunities to increase the distance covered by these sensors ...
    • Phasorial DPP-BOTDA sensor tolerant to non-local effects 

      Urricelqui Polvorinos, Javier Upna; Mariñelarena Ollacarizqueta, Jon Upna; Sagüés García, Mikel Upna; Loayssa Lara, Alayn Upna (SPIE, 2014)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      We introduce a modification of the differential pulse width pair technique in a BOTDA sensor based on a phase modulated probe wave and RF demodulation. This provides a differential Brillouin phasorial signal with high ...
    • Planar DNG superstrate for dipole antenna gain enhancement 

      Sáenz Sáinz, Elena Upna; Gonzalo García, Ramón Upna; Ederra Urzainqui, Íñigo Upna; Ikonen, Pekka; Tretyakov, Sergei A.; Maagt, Peter de (2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, a volumetric double-negative (DNG) superstrate based on grids of dipoles and wires for dipole antenna applications is proposed.
    • Polarization diversity for Brillouin distributed fiber sensors based on a double orthogonal pump 

      Urricelqui Polvorinos, Javier Upna; López Fernandino, Felipe; Sagüés García, Mikel Upna; Loayssa Lara, Alayn Upna (SPIE, 2014)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      We demonstrate a novel Brillouin optical time domain analysis sensor deploying a polarization diversity technique which eliminates the need for polarization scrambling, providing measurements that are largely immune to the ...