Listar Artículos de revista DIEE - IEES Aldizkari artikuluak por título

Mostrando ítems 23-42 de 391

    • Arrangements of via-holes in microstrip lines as metallodielectric periodic structures 

      Gómez Laso, Miguel Ángel Upna Orcid; Lopetegui Beregaña, José María; Bacaicoa, Miguel; Hernández, Jorge; Gonzalo García, Ramón Upna Orcid; Sorolla Ayza, Mario Upna (Wiley, 2000)   Artículo / Artikulua  OpenAccess
      In this paper, the use of via holes in microstrip lines to design periodic structures that can be regarded as metallodielectric electromagnetic crystals is analyzed. The proposed novel periodic structures achieve a notably ...

    • Astronomical component estimation (ACE v.1) by time-variant sinusoidal modeling 

      Sinnesael, Matthias; Zivanovic, Miroslav Upna Orcid; Vleeschouwer, David De; Claeys, Philippe; Schoukens, Johan (Copernicus Publications, 2016)   Artículo / Artikulua  OpenAccess
      Accurately deciphering periodic variations in paleoclimate proxy signals is essential for cyclostratigraphy. Classical spectral analysis often relies on methods based on (fast) Fourier transformation. This technique has ...

    • Band-pass filter-like antenna validation in an ultra-wideband in-car wireless channel 

      García Zuazola, Ignacio Julio; Azpilicueta Fernández de las Heras, Leyre Upna Orcid; Sharma, Ashwani; Landaluce, Hugo; Falcone Lanas, Francisco Javier Upna Orcid (Institution of Engineering and Technology (IET), 2015)   Artículo / Artikulua  OpenAccess
      Ultra-wideband (UWB) is a very attractive technology for innovative in-car wireless communications requiring high data rates. A designated antenna, which presents a reflection coefficient (S11) matched band comparable to ...

    • Boost DC-AC inverter: a new control strategy 

      Sanchis Gúrpide, Pablo Upna Orcid; Ursúa Rubio, Alfredo Upna Orcid; Gubía Villabona, Eugenio Upna Orcid; Marroyo Palomo, Luis Upna Orcid (IEEE, 2005)   Artículo / Artikulua  OpenAccess
      Boost dc–ac inverter naturally generates in a single stage an ac voltage whose peak value can be lower or greater than the dc input voltage. The main drawback of this structure deals with its control. Boost inverter ...

    • BOTDA measurements tolerant to non-local effects by using a phase-modulated probe wave and RF demodulation 

      Urricelqui Polvorinos, Javier Upna Orcid; Sagüés García, Mikel Upna Orcid; Loayssa Lara, Alayn Upna Orcid (Optical Society of America, 2013)   Artículo / Artikulua  OpenAccess
      We demonstrate a Brillouin optical time domain analysis sensor based on a phase modulated probe wave and RF demodulation that provides measurements tolerant to frequency dependent variations of the pump pulse power induced ...

    • Brillouin optical time-domain analysis sensor assisted by Brillouin distributed amplification of pump pulses 

      Urricelqui Polvorinos, Javier Upna Orcid; Sagüés García, Mikel Upna Orcid; Loayssa Lara, Alayn Upna Orcid (Optical Society of America, 2015)   Artículo / Artikulua  OpenAccess
      We demonstrate the extension of the measurement range of Brillouin optical time-domain analysis (BOTDA) sensors using a distributed Brillouin amplifier (DBA). The technique is based on injecting a DBA pump wave in the ...

    • Brillouin optical time-domain analysis sensor with pump pulse amplification 

      Mompó Roselló, Juan José Upna; Urricelqui Polvorinos, Javier Upna Orcid; Loayssa Lara, Alayn Upna Orcid (Optical Society of America, 2016)   Artículo / Artikulua  OpenAccess
      We demonstrate a simple technique to provide conventional Brillouin optical time-domain analysis sensors with mitigation for pump pulse attenuation. The technique is based on operating the sensor in loss configuration so ...

    • Broadband frequency and angular response of a sinusoidal bull’s eye antenna 

      Beaskoetxea Gartzia, Unai Upna Orcid; Navarro Cía, Miguel Upna Orcid; Beruete Díaz, Miguel Upna Orcid (IOP Publishing, 2016)   Artículo / Artikulua  OpenAccess
      A thorough experimental study of the frequency and beaming angle response of a metallic leaky-wave bull’s eye antenna working at 77 GHz with a sinusoidally corrugated profile is presented. The beam scanning property of ...

    • Broadband radar cross-section reduction using AMC technology 

      Iriarte Galarregui, Juan Carlos Upna Orcid; Tellechea Pereda, Amagoia Upna Orcid; Martínez de Falcón, José Luis Upna; Ederra Urzainqui, Íñigo Upna Orcid; Gonzalo García, Ramón Upna Orcid; 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 ...

    • Broadband spoof plasmons and subwavelength electromagnetic energy confinement on ultrathin metafilms 

      Navarro Cía, Miguel Upna Orcid; Beruete Díaz, Miguel Upna Orcid; Agrafiotis, Spyros; Falcone Lanas, Francisco Javier Upna Orcid; Sorolla Ayza, Mario Upna; Maier, Stefan A. (Optical Society of America, 2009)   Artículo / Artikulua  OpenAccess
      A complementary split ring resonator (CSRR)-based metallic layer is proposed as a route to mimic surface plasmon polaritons. A numerical analysis of the textured surface is carried out and compared to previous prominent ...

    • Challenges in wireless system integration as enablers for indoor context aware environments 

      López Iturri, Peio Upna Orcid; Aguirre Gallego, Erik Upna Orcid; Azpilicueta Fernández de las Heras, Leyre Upna Orcid; Astrain Escola, José Javier Upna Orcid; Villadangos Alonso, Jesús Upna Orcid; Falcone Lanas, Francisco Javier Upna Orcid (MDPI, 2017)   Artículo / Artikulua  OpenAccess
      The advent of fully interactive environments within Smart Cities and Smart Regions requires the use of multiple wireless systems. In the case of user-device interaction, which finds multiple applications such as Ambient ...

    • Characterization and consideration of topological impact of wireless propagation in a commercial aircraft environment [wireless corner] 

      Rajo-Iglesias, Eva; Aguirre Gallego, Erik Upna Orcid; López Iturri, Peio Upna Orcid; Azpilicueta Fernández de las Heras, Leyre Upna Orcid; Arpón Díaz-Aldagalán, Javier; Falcone Lanas, Francisco Upna Orcid (IEEE, 2013)   Artículo / Artikulua  OpenAccess
      Wireless systems are gaining a relevant role for multiple communication tasks within commercial aircrafts. In this work, wireless propagation in an indoor commercial airplane cabin will be analyzed. The impact of indoor ...

    • Characterization and modeling of the capacitive HBC Channel 

      Pereira, Maicon D.; Álvarez Botero, Germán Andrés; Sousa, Fernando Rangel de (IEEE, 2015)   Artículo / Artikulua  OpenAccess
      The increasing interest in wireless body area networks has created the need for alternative communication schemes. One example of such schemes is the use of the human body as a communication medium. This technology is ...

    • Characterization of microring filters for differential group delay applications 

      Doménech, D.; Chamorro Posada, P.; Fraile Pelaez, F.J.; Erro Betrán, María José Upna Orcid; Tainta Ausejo, Santiago Upna Orcid; Muriel, M. A.; Baños, R.; Bolten, J.; Kleinjans, H. (IEEEOptical Society of America, 2017)   Artículo / Artikulua  OpenAccess
      The longitudinal offset technique permits to improve the accuracy of the coupling coefficients of integrated directional couplers and provides designs that can be easily implemented with current fabrication tolerances. ...

    • Characterization of RF-MOSFETs in common-source configuration at different source-to-bulk voltages from S-parameters 

      Zárate-Rincón, Fabián; Álvarez Botero, Germán Andrés; Torres-Torres, Reydezel; Murphy-Arteaga, Roberto S.; Decoutere, Stefaan (IEEE, 2013)   Artículo / Artikulua  OpenAccess
      Using a new test fixture that allows us to bias the bulk terminal through an additional compensated DC probe, a two-port S-measurement-based methodology to characterize RF-MOSFETs in common-source configuration is herein ...

    • Characterization of wireless channel impact on wireless sensor network performance in public transportation buses 

      Azpilicueta Fernández de las Heras, Leyre Upna Orcid; López Iturri, Peio Upna Orcid; Aguirre Gallego, Erik Upna Orcid; Astrain Escola, José Javier Upna Orcid; Villadangos Alonso, Jesús Upna Orcid; Zubiri Segura, Cristóbal; Falcone Lanas, Francisco Javier Upna Orcid (IEEE, 2015)   Artículo / Artikulua  OpenAccess
      Wireless communications systems are growing rapidly during the last two decades and they are gaining a significant role for multiple communication tasks within public transportation buses. In this work, the impact of ...

    • Chirping techniques to maximize the power-handling capability of harmonic waveguide low-pass filters 

      Teberio Berdún, Fernando Upna Orcid; Arregui Padilla, Iván Upna Orcid; Gómez Torrent, Adrián Upna Orcid; Arnedo Gil, Israel Upna Orcid; Chudzik, Magdalena Upna; Zedler, Michael; Goertz, Franz-Josef; Jost, Rolf; Lopetegui Beregaña, José María Upna Orcid; Gómez Laso, Miguel Ángel Upna Orcid (IEEE, 2016)   Artículo / Artikulua  OpenAccess
      A novel chirping technique is applied to the design of very high-power waveguide harmonic low-pass filters. The technique could be used, for instance, to avoid multipactor testing in multicarrier systems such as the ...

    • Circuit and multipolar approaches to investigate the balance of powers in 2D scattering problems 

      Liberal Olleta, Íñigo Upna Orcid; Ederra Urzainqui, Íñigo Upna Orcid; Gonzalo García, Ramón Upna Orcid; 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 ...

    • Circuit approach to the minimal configuration of terahertz anomalous extraordinary transmission 

      Beruete Díaz, Miguel Upna Orcid; Navarro Cía, Miguel Upna Orcid; Kuznetsov, Sergei A.; Sorolla Ayza, Mario Upna (American Institute of Physics, 2011)   Artículo / Artikulua  OpenAccess
      In this letter we present an in-depth circuit analysis of anomalous extraordinary transmission ET through subwavelength slit and hole arrrays loaded by a dielectric slab. We show the key role played by the thickness of the ...

    • Compact and highly-efficient polarization independent vertical resonant couplers for active-passive monolithic integration 

      Galarza Galarza, Marko Upna Orcid; Thourhout, Dries Van; Baets, Roel; López-Amo Sáinz, Manuel Upna Orcid (Optical Society of America, 2008)   Artículo / Artikulua  OpenAccess
      Compact low-loss polarization independent vertical coupling between a 1.55 μm InGaAsP bulk active waveguide and a passive waveguide based on bimodal interference is presented. Simulation results show low coupling loss (<0.1 ...
      El Repositorio ha recibido la ayuda de la Fundación Española para la Ciencia y la Tecnología para la realización de actividades en el ámbito del fomento de la investigación científica de excelencia, en la Línea 2. Repositorios institucionales (convocatoria 2020-2021).
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