• Amorphous glass-coated ferromagnetic wires in microwave engineering 

      Liberal Olleta, Íñigo Upna (2013)   Tesis doctoral / Doktoretza tesia  OpenAccess
      En esta tesis se ha estudiado el uso de hilos ferromagnéticos recubiertos de vidrio en ingeniería de microondas. Para este fin, se han formulado modelos analíticos y equivalentes circuitales de la interacción entre un ...
    • Análisis de efecto de un superestrato left-handed en la apertura de una guía rectangular 

      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, results showing the experimental verification of the gain improvement of a rectangular waveguide antenna when a left-handed material (LHM) is used as superstrate are presented. The improvement has been ...
    • Boresight radiation of a dipole antenna with a uniform or non-uniform left handed superstrate 

      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 measurements of the radiation performances of a dipole fed by a coaxial balun and a dipole with a left handed superstrate based on a finite periodic repetition of a unit cell are compared. Two types ...
    • Broadband radar cross-section reduction using AMC technology 

      Iriarte Galarregui, Juan Carlos Upna; Tellechea Pereda, Amagoia Upna; Martínez de Falcón, José Luis Upna; Ederra Urzainqui, Íñigo Upna; Gonzalo García, Ramón Upna; Maagt, Peter de (IEEE, 2013)   Artículo / Artikulua  OpenAccess
      This paper presents the design, fabrication and characterization of a planar broadband chessboard structure to reduce the radar cross-section (RCS) of an object. The chessboard like configuration is formed by combining two ...
    • Circuit and multipolar approaches to investigate the balance of powers in 2D scattering problems 

      Liberal Olleta, Íñigo Upna; Ederra Urzainqui, Íñigo Upna; Gonzalo García, Ramón Upna; Ziolkowski, Richard W. (EMW Publishing, 2013)   Artículo / Artikulua  OpenAccess
      Circuit and multipolar approaches are presented to investigate the correlation between absorption and scattering processes in 2D problems. This investigation was inspired by earlier works of Prof.R.E. Collin, which pointed ...
    • Decoupling of multifrequency dipole antenna arrays for microwave imaging applications 

      Sáenz Sainz, Elena Upna; Guven, K.; Ozbay, E.; Ederra Urzainqui, Íñigo Upna; Gonzalo García, Ramón Upna (Hindawi Publishing Corporation, 2010)   Artículo / Artikulua  OpenAccess
      The mutual coupling between elements of a multifrequency dipole antenna array is experimentally investigated by S-parameter measurements and planar near-field scanning of the radiated field. A multifrequency array with ...
    • 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
    • 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 ...
    • Development of an auto-calibrated receiver in planar technology at millimetre-wave frequencies 

      Rebollo Mugueta, Ainara Upna (2015)   Tesis doctoral / Doktoretza tesia  OpenAccess
      This dissertation deals with the development of an auto-calibrated receiver at W-band for Passive Millimetre-Wave imaging applications. The proposed receiver has three main characteristics. Firstly, its differential ...
    • Dipolos y metamateriales: mejora de las características de radiación 

      Sáenz Sáinz, Elena Upna; Gonzalo García, Ramón Upna; Ederra Urzainqui, Íñigo Upna; Maagt, Peter de (2004)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work, pass band properties of Left Handed Media (LHM) are demonstrated. These properties have been used in order to make a LHM super-substrate that is put over a dipole antenna. This super-substrate is going to ...
    • Domain integral equations for electromagnetic band-gap slab simulations 

      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.; Maagt, Peter de; Marchand, L. (2004)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Electromagnetic band-gap substrates o er advantages regarding cross-coupling in sub-mm range imaging array applications. Electromagnetic scattering by such substrates may e ectively be formulated in terms of integro- di ...
    • Dual circularly polarized broadside beam metasurface antenna 

      Ederra Urzainqui, Íñigo Upna; Tellechea Pereda, Amagoia Upna; Caminita, Francesco; Martini, Enrica; Iriarte Galarregui, Juan Carlos Upna; Gonzalo García, Ramón Upna; Maci, Stefano (IEEE, 2016)   Artículo / Artikulua  OpenAccess
      This paper presents the design of a modulated metasurface (MTS) antenna capable to provide both righthand (RH) and left-hand (LH) circularly polarized (CP) boresight radiation at Ku-band (13.5 GHz). This antenna is based ...
    • EBG superstrate antenna for WAAS bands 

      Osés de León, Ángel Upna; Iriarte Galarregui, Juan Carlos Upna; Ederra Urzainqui, Íñigo Upna; Gonzalo García, Ramón Upna (2008)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Multiband antennas can simplify considerably the complexity of receivers and transmitters, reducing the size and the mass of the conventional configurations. On the other hand, applications with high directivity requirements ...
    • Electromagnetic band gap technology for millimetre wave applications 

      Ederra Urzainqui, Íñigo Upna (2004)   Tesis doctoral / Doktoretza tesia  OpenAccess
      En esta tesis se ha estudiado el uso de estructuras Electromagnetic Bandgap (EBG) para frecuencias en la banda de las millimétricas. Estas frecuencias son muy apropiadas para aplicaciones de generación de imágenes ...
    • Electromangetic force density in electrically and magnetically polarizable media 

      Liberal Olleta, Íñigo Upna; Ederra Urzainqui, Íñigo Upna; Gonzalo García, Ramón Upna; Ziolkowski, Richard W. (American Physical Society, 2013)   Artículo / Artikulua  OpenAccess
      The force density induced by electromagnetic fields in electrically and magnetically polarizable media is studied analytically. Different formulations of the force density as a function of field-related quantities, ...
    • Enhanced radiation properties of a rectangular waveguide by means of a left handed media 

      Sáenz Sáinz, Elena Upna; Ederra Urzainqui, Íñigo Upna; Gonzalo García, Ramón Upna; Maagt, Peter de (2005)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, the results of experimental investigations to improve the gain between two antennas by means of a Left Handed Material (LHM) are presented. The basic idea is the use of a LHM media acting as a resonator ...
    • 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 ...
    • Evanescently fed electromagnetic band-gap horn antennas and arrays 

      Khromova, Irina Upna; Ederra Urzainqui, Íñigo Upna; Teniente Vallinas, Jorge Upna; Gonzalo García, Ramón Upna; Esselle, Karu P. (IEEE, 2012)   Artículo / Artikulua  OpenAccess
      The design of a horn antenna based on electromagnetic band-gap structures (EBGs) and fed by evanescent fields in the containing periodic structure is presented. Such all-dielectric antennas can form compact arrays and ...
    • 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 ...