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Rodríguez Ulibarri, Pablo

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Rodríguez Ulibarri

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Pablo

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0000-0001-5705-5457

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2013 - 20196
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Subject: Metamaterials ×

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Now showing 1 - 6 of 6
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    PublicationOpen Access
    Blind spot mitigation in phased array antenna using metamaterials
    (IEEE, 2014) Crépin, Thomas; Martel, Cédric; Gabard, Benjamin; Boust, Fabrice; Martinaud, Jean-Paul; Dousset, Thierry; Rodríguez Ulibarri, Pablo; Beruete Díaz, Miguel; Loecker, Claudius; Bertuch, Thomas; Marcotegui, José Antonio; Maci, Stefano; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
    In this work, a metaradome based on a fakir’s bed of nails is designed and tested in order to suppress the blind directions of a 100-element antenna array. The antenna is a microstrip array designed to operate in X-band. The fakir’s bed metamaterial-like was first approximated using analytical formulas before a full-wave numerical optimization. Experimental results are exposed and confronted to numerical results. They show a significant reduction of the blind spot subsequent to the metaradome addition.
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    PublicationOpen Access
    On the performance of an ENZ-based sensor using transmission line theory and effective medium approach
    (IOP Publishing, 2019) Pacheco-Peña, Víctor; Beruete Díaz, Miguel; Rodríguez Ulibarri, Pablo; Engheta, Nader; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren; Institute for Advanced Materials and Mathematics - INAMAT2; Ingeniería Eléctrica, Electrónica y de Comunicación
    In this paper we perform an in-depth theoretical studyofa sensing platform based on epsilon-near- zero (ENZ) metamaterials. The structure proposed for sensing is a narrow metallic waveguide channel. An equivalent circuit model is rigorouslydeduced using transmission line theory, considering several configurations for a dielectric body (analyte sample) inserted within the narrow channel, showing good agreement with results obtained from numerical simulations. The transmission line model is able to reproduce even the most peculiar details ofthe sensing platform response. Its performance is then evaluated byvarying systematically the size, position and permittivity ofthe analyte, and height ofthe ENZ channel. It is shown that the sensor is capable ofdetecting changes in the permittivity/ refractive index or position even with deeplysubwavelength analyte sizes (∼0.05λ0), giving a sensitivity up to 0.03m/RIU and a figure ofMerit∼25. The effective medium approach is evaluated by treating the inhomogeneous cross-section ofthe analyte as a transmission line filled with a homogeneous material.
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    PublicationOpen Access
    Nonbianisotropic complementary split ring resonators as angular selective metasurfaces
    (Optical Society of America, 2017) Rodríguez Ulibarri, Pablo; Beruete Díaz, Miguel; Ingeniaritza Elektrikoa eta Elektronikoa; Institute of Smart Cities - ISC; Ingeniería Eléctrica y Electrónica
    In this work, a metasurface with unconventional angular performance and composed by a nonbianisotropic complementary split ring resonator (NB-CSRR) is analyzed numerically and experimentally. A numerical study comparing the performance with the original complementary split ring resonator is conducted, showing very interesting transmission properties, such as complete filtering under normal incidence and high transmission peaks at oblique incidence for the NB-CSRR metasurface. A bilayered NB-CSRR prototype working at millimeter waves with a total thickness of 100 μm (0.1 times the operation wavelength) is fabricated and tested with a good agreement between simulation results and experiments. Very exciting applications based on the presented structure, such as advanced angular selectivity devices with great rejection levels at normal incidence and angular sensing devices, can be envisaged.
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    PublicationOpen Access
    Metamaterials and extraordinary transmission structures applied to microwave, millimeter and terahertz waves devices
    (2017) Rodríguez Ulibarri, Pablo; Beruete Díaz, Miguel; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
    Los metamateriales aparecen en los primeros años del siglo XXI como materiales artificiales que presentan un comportamiento electromagnético de alguna manera exótico. Al mismo tiempo, se descubre un nuevo fenómeno denominado transmisión extraordinaria. Ambas disciplinas conllevaron a una revisión profunda del electromagnetismo básico aunando dos comunidades científicas que últimamente permanecían desligadas, las microondas y la óptica. Además, tanto los metamateriales como la transmisión extraordinaria fueron explotados para desarrollar nuevos dispositivos para un amplio abanico de aplicaciones tales como seguridad, comunicaciones o espectroscopía. En esta Tesis se investiga el uso de dispositivos inspirados en estructuras metamaterial y el fenómeno de transmisión extraordinaria operando a frecuencias de microondas, ondas milimétricas y terahercios. El contenido de la Tesis se puede dividir en tres partes diferenciadas que se relacionan con cada uno de los rangos frecuenciales estudiados, es decir, microondas, ondas milimétricas y terahercios. La primera parte de la Tesis está dedicada a investigar cómo los metamateriales pueden mejorar las prestaciones de un sistema de antenas para aplicaciones radar en el rango de las microondas. La segunda parte trata de forma teórica y experimental diferentes estructuras periódicas bidimensionales que trabajan en el rango de las ondas milimétricas con el fin de estudiar los límites entre el fenómeno de transmisión extraordinaria y regímenes ordinarios, diseñar dispositivos unidireccionales y sintonizables y metasuperficies con una respuesta angular no convencional. Finalmente, la tercera parte de la Tesis, hace extensible el uso de estructuras periódicas bidimensionales para aplicaciones de sensado a frecuencias de terahercio.
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    PublicationOpen Access
    Experimental demonstration of metamaterials application for mitigating scan blindness in phased array antennas
    (EDP Sciences, 2016) Rodríguez Ulibarri, Pablo; Crépin, Thomas; Martel, Cédric; Boust, Fabrice; Falcone Lanas, Francisco Javier; Loecker, Claudius; Herbertz, Kai; Bertuch, Thomas; Dousset, Thierry; Martinaud, Jean-Paul; Maci, Stefano; Marcotegui, José Antonio; Beruete Díaz, Miguel; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
    This paper presents two metamaterial-inspired solutions to mitigate the scan blindness effects in a phased array antenna. In the first solution, portions of a bed of nails are introduced in the radome to prevent the excitation of surface waves. In the second solution, a superstrate metasurface is designed to synthesize a permittivity tensor optimized to achieve a wide angle impedance matching. In both approaches, the numerical simulations are successfully compared with measurements of a phased array antenna prototype with 100 elements. The wire medium-based solution reveals an effective way for reducing the blind-spot in a wide bandwidth, while the metaradome has been found less suitable for the same purpose.
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    PublicationOpen Access
    Hedgehog subwavelength hole arrays: control over the THz enhanced transmission
    (Institute of Physics Publishing, 2013) Navarro Cía, Miguel; Rodríguez Ulibarri, Pablo; Beruete Díaz, Miguel; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa; Gobierno de Navarra / Nafarroako Gobernua: 055/01/11
    By backing or sandwiching a holey metal layer with or between isotropic dielectric slabs, additional peaks of transmission within the long-wavelength regime arise as a result of the induced transverse magnetic (TM) or transverse electric (TE) grounded dielectric modes. A similar control of the complex surface wave modes, and thus of the extraordinary transmission (ET) peaks, is demonstrated here via anisotropic slabs in the form of a fakir's bed of nails. However, it is shown that those ET peaks formed from TE modes are suppressed because of the inherent dispersion characteristics of the free-standing grounded pins. This allows the red-shifting of the ET for the polarization parallel to the larger in-plane period of the hole array, but unlike the dielectric isotropic slab configuration, the orthogonal polarization remains inhibited.