Now showing items 1-20 of 57

    • 3D-printed 96 GHz bull’s-eye antenna with off-axis beaming 

      Beaskoetxea Gartzia, Unai Upna Orcid; Maci, Stefano; Navarro Cía, Miguel Upna Orcid; Beruete Díaz, Miguel Upna Orcid (IEEE, 2017)   Artículo / Artikulua  OpenAccess
      Reducing the profile, footprint and weight of antennas embarked on aircrafts, drones or satellites has been a long pursued objective. Here we tackle this issue by developing a millimeter-wave 96 GHz elliptical Bull’s-Eye ...
    • 77-GHz high-gain bull’s-eye antenna with sinusoidal profile 

      Beaskoetxea Gartzia, Unai Upna Orcid; Pacheco-Peña, Víctor Upna Orcid; Orazbayev, Bakhtiyar Upna Orcid; Akalin, Tahsin; Maci, Stefano; Navarro Cía, Miguel Upna Orcid (IEEE, 2015)   Artículo / Artikulua  OpenAccess
      A high-gain Bull’s-Eye leaky-wave horn antenna working at 77 GHz with sinusoidal profile has been designed, fabricated, and experimentally measured. The influence of the number of periods on the gain and beamwidth is ...
    • Accurate circuit modeling of fishnet structures for negative-index-medium applications 

      Torres Landívar, Víctor Upna; Mesa, Francisco; Navarro Cía, Miguel Upna Orcid; Rodríguez Berral, Raúl; Beruete Díaz, Miguel Upna Orcid; Medina, Francisco (IEEE, 2016)   Artículo / Artikulua  OpenAccess
      Metallic plates with a two-dimensional (2D) periodic distribution of sub-wavelength apertures are known to exhibit extraordinary transmission of electromagnetic waves. Stacking two or more of such plates gives place to the ...
    • All-metallic ε-near-zero (ENZ) lens based on ultra-narrow hollow rectangular waveguides: experimental results 

      Orazbayev, Bakhtiyar Upna Orcid; Torres Landívar, Víctor Upna; Pacheco-Peña, Víctor Upna Orcid; Falcone Lanas, Francisco Javier Upna Orcid; Teniente Vallinas, Jorge Upna Orcid; Beruete Díaz, Miguel Upna Orcid; Sorolla Ayza, Mario Upna; Navarro Cía, Miguel Upna Orcid; Engheta, Nader (IEEE, 2014)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Here we perform numerical and experimental investigation of plano-concave all-metallic ε-near-zero (ENZ) lens with operational frequency f = 144 GHz. The ENZ lens is achieved by stacking an array of narrow hollow rectangular ...
    • Analysis of surface-plasmon-like modes under an engineering perspective 

      Navarro Cía, Miguel Upna Orcid; Beruete Díaz, Miguel Upna Orcid; Sorolla Ayza, Mario Upna (2011)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this communication we show how one can exploit equivalent circuits to analyze surface-plasmon-like modes (slit and hole arrays, Sievenpiper mushrooms and coaxial hole arrays) and to propose new designs with outstanding ...
    • Annular apertures in metallic screens as extraordinary transmission and frequency selective surface structures 

      Rodríguez Ulibarri, Pablo Upna Orcid; Navarro Cía, Miguel Upna Orcid; Rodríguez Berral, Raúl; Mesa, Francisco; Medina, Francisco; Beruete Díaz, Miguel Upna Orcid (IEEE, 2017)   Artículo / Artikulua  OpenAccess
      A 2-D periodic array of annular apertures (or ring slots) is studied using an accurate circuit model. The model accounts for distributed and dynamic effects associated with the excitation of high-order modes operating above ...
    • The beauty of anisotropy in extraordinary transmission fishnet metamaterials 

      Navarro Cía, Miguel Upna Orcid; Beruete Díaz, Miguel Upna Orcid; Sorolla Ayza, Mario Upna (2011)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work, we explore both numerically and experimentally, the possibility to obtain positive and negative refraction regimes that depend on the wave polarization, exploiting the strong anisotropy of extraordinary ...
    • 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 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 ...
    • 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 dual-band terahertz quarter-wave plate metasurface 

      Torres Landívar, Víctor Upna; Etayo Salinas, David Upna; Ortuño Molinero, Rubén Upna; Navarro Cía, Miguel Upna Orcid; Beruete Díaz, Miguel Upna Orcid (IEEE, 2014)   Artículo / Artikulua  OpenAccess
      A dual-band quarter-wave plate based on a modified extraordinary transmission hole array is numerically analyzed and experimentally demonstrated at terahertz frequencies. To control independently orthogonal polarizations, ...
    • Comportamiento de propagacion electromagnetica en el apilamiento de agujeros sublambda y agujeros propagantes 

      Navarro Cía, Miguel Upna Orcid; Beruete Díaz, Miguel Upna Orcid; Falcone Lanas, Francisco Javier Upna Orcid; 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 ...
    • Converging biconcave metallic lens by double-negative extraordinary transmission metamaterial 

      Navarro Cía, Miguel Upna Orcid; Beruete Díaz, Miguel Upna Orcid; Sorolla Ayza, Mario Upna; Campillo, Igor (AIP Publishing, 2009)   Artículo / Artikulua  OpenAccess
      In this letter we present simulation and experimental results of a left-handed converging biconcave metallic lens made of stacked subwavelength hole arrays SSHAs working in the millimeter wave range with additional ...
    • Description of bow-tie nanoantennas excited by localized emitters using conformal transformation 

      Pacheco-Peña, Víctor Upna Orcid; Beruete Díaz, Miguel Upna Orcid; Fernández Domínguez, Antonio I.; Luo, Yu; Navarro Cía, Miguel Upna Orcid (American Chemical Society, 2016)   Artículo / Artikulua  OpenAccess
      The unprecedented advance experienced by nano- fabrication techniques and plasmonics research over the past few years has made possible the realization of nanophotonic systems entering into the so-called strong coupling ...
    • Dipolar resonances in conductive carbon micro-fibers probed by near-field terahertz spectroscopy 

      Khromova, Irina Upna Orcid; Navarro Cía, Miguel Upna Orcid; Brener, I.; Reno, J. L.; Ponomarev, A.; Mitrofanov, Oleg (AIP Publishing, 2015)   Artículo / Artikulua  OpenAccess
      We observe dipole resonances in thin conductive carbon micro-fibers by detecting an enhanced electric field in the near-field of a single fiber at terahertz (THz) frequencies. Time-domain analysis of the electric field ...
    • Electroinductive waves role in left-handed stacked complementary split rings resonators 

      Beruete Díaz, Miguel Upna Orcid; Aznabet, Mariem; Navarro Cía, Miguel Upna Orcid; El Mrabet, O.; Falcone Lanas, Francisco Javier Upna Orcid; Aknin, N.; Essaaidi, M.; Sorolla Ayza, Mario Upna (Optical Society of America, 2009)   Artículo / Artikulua  OpenAccess
      In this letter it is presented a Left-Handed Metamaterial design route based upon stacked arrays of screens made of complementary split rings resonators under normal incidence in the microwave regime. Computation of ...
    • Electromagnetic response of extraordinary transmission plates inspired on Babinet’s principle 

      Navarro Cía, Miguel Upna Orcid; Beruete Díaz, Miguel Upna Orcid; Sorolla Ayza, Mario Upna (InTech, 2011)   Capítulo de libro / Liburuen kapitulua  OpenAccess
      This chapter is devoted to polarization effects arisen from perforated metallic plates exhibiting extraordinary transmission (ET). Setting aside the state-of-the-art of perforated metallic plates, we show that by applying ...
    • Epsilon-near-zero metalenses operating in the visible 

      Pacheco-Peña, Víctor Upna Orcid; Navarro Cía, Miguel Upna Orcid; Beruete Díaz, Miguel Upna Orcid (Elsevier, 2016)   Artículo / Artikulua  OpenAccess
      Several converging lenses working in the permittivity near to zero (ENZ) regime at optical frequencies are designed using an array of metal-dielectric-metal plasmonic waveguides. These plasmonic waveguides show a dispersive ...
    • Experimental demonstration of a millimeter-wave metallic ENZ lens based on the energy squeezing principle 

      Torres Landívar, Víctor Upna; Orazbayev, Bakhtiyar Upna Orcid; Pacheco-Peña, Víctor Upna Orcid; Teniente Vallinas, Jorge Upna Orcid; Beruete Díaz, Miguel Upna Orcid; Navarro Cía, Miguel Upna Orcid; Sorolla Ayza, Mario Upna (IEEE, 2015)   Artículo / Artikulua  OpenAccess
      The performance of an epsilon-near zero (ENZ) plano-concave lens is experimentally demonstrated and verified at the D-band of the millimeter-waves. The lens is comprised of an array of narrow metallic waveguides near cut-off ...
    • Experimental demonstration of phase resonances in metallic compound gratings with subwavelength slits in the millimeter wave regime 

      Navarro Cía, Miguel Upna Orcid; Skigin, Diana C.; Beruete Díaz, Miguel Upna Orcid; Sorolla Ayza, Mario Upna (AIP Publishing, 2009)   Artículo / Artikulua  OpenAccess
      We provide experimental evidence of phase resonances in metallic periodic structures in which each period comprises several subwavelength slits of the same width. We have analyzed and measured the response of these ...