Diseño, fabricación y medida de antenas basadas en planos de masa radiantes ranurados

Due to the technology growth and the requirements of the customers, current mobile devices must have a new integrated hardware, keeping approximately the same dimensions and weight, resulting in a lack of space for the device components, such as the antennas. For this reason, in recent years the idea of using the PCBs ground plane of the mobile devices as the radiating element of the antenna has been taking relevance. Following this research line, in this work we present some structures based on radiating ground planes that can replace the antennas of actual mobile handsets.Vila Jiménez, A. (2011). Diseño, fabricación y medida de antenas basadas en planos de masa radiantes ranurados. Universitat Politècnica de València. http://hdl.handle.net/10251/14601Archivo delegad

Test-Fixture for Suspended-Strip Gap-Waveguide Technology on Ka-Band

This letter presents a Test-Fixture for a Suspended-Strip Gap-Waveguide technology that provides a fast measurement system for the prototyping stage. For this purpose, a transition from standard rectangular waveguide to this new technology has been developed. A TRL kit and a repeatability study have been made to ensure the reliability of the process, and several straightforward circuits have been manufactured and measuredThis work was supported by the Spanish Ministerio de Ciencia e Innovacionunder projects TEC2010-20841-C04-01 and CSD2008-00068.Gahete Arias, C.; Baquero Escudero, M.; Valero-Nogueira, A.; Vila Jiménez, A. (2013). Test-Fixture for Suspended-Strip Gap-Waveguide Technology on Ka-Band. IEEE Microwave and Wireless Components Letters. 23(6):321-323. https://doi.org/10.1109/LMWC.2013.2258000S32132323

Single-Layer Circularly-Polarized Ka-Band Antenna Using Gap Waveguide Technology

(c) 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this[EN] A single-layer circularly polarized array antenna is proposed in the context of the so-called gap waveguide (GW) technology. This ultra-compact antenna combines the corporate feeding network and the radiating apertures over one single layer, standing out among other solutions proposed so far in this technology. Apertures are backed by chamfered cylindrical cavities and are fed through a corporate feeding network, which combines both groove and ridge GWs. Cavities are naturally integrated within the bed of nails hosting grooves and ridges, leading to a very low-profile 4×4 array. Experimental results are presented to confirm the good radiation performance obtained by simulations. The proposed array architecture may be seamlessly enlarged to any size thanks to the scalability of the gap-based corporate feeding network, making this solution very attractive for medium to high-gain applications.This work was supported by the Spanish Ministry of Economics and Competitiveness under Project TEC2013-47360-C3-3-P and Project TEC2016-79700-C2-1-R.Ferrando-Rocher, M.; Herranz Herruzo, JI.; Valero-Nogueira, A.; Vila Jiménez, A. (2018). Single-Layer Circularly-Polarized Ka-Band Antenna Using Gap Waveguide Technology. IEEE Transactions on Antennas and Propagation. 66(8):3837-3845. https://doi.org/10.1109/TAP.2018.2835639S3837384566

Untilted narrow-wall slots excited by parasitic dipoles in groove-gap waveguide technology

© 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.This work describes a new way to excite untilted slots in the narrow wall of a rectangular waveguide. The radiating structure consists of an inclined parasitic dipole located within the waveguide, parallel to narrow wall, and close to the untilted slot. Furthermore, the rectangular waveguide is advantageously replaced by a groove gap waveguide so that nonwraparound resonant slots can be used. The concept is discussed in detail and demonstrated experimentally through a linear arrayThis work was supported in part by the Spanish Ministerio de Economia y Competitividad under project TEC2013-47360-C3-3P.Herranz Herruzo, JI.; Valero-Nogueira, A.; Martínez Giner, S.; Vila Jiménez, A. (2015). Untilted narrow-wall slots excited by parasitic dipoles in groove-gap waveguide technology. IEEE Transactions on Antennas and Propagation. 63(11):4759-4765. https://doi.org/10.1109/TAP.2015.2478144S47594765631

SWORD: Una utilidad para la integración de repositorios con aplicaciones de gestión docente

Comunicación presentada en el 9º Workshop de Rebiun sobre proyectos digitales, Investigación, innovación e información: tendencias en los sistemas digitales de gestión de la producción científica, celebrado en Salamanca los días 1 y 2 de octubre de 2009.[ES] La Universidad Politécnica de Cataluña ha desarrollado con la Facultad de Informática de Barcelona un sistema de integración de memorias y sus datos asociados de forma transparente durante el proceso administrativo por medio de unos conectores desarrollados conjuntamente por el servicio de Bibliotecas de la UPC y el laboratorio de cálculo de la FIB. Estos conectores se basan en la tecnología SWORD que por medio de XML codifican los datos introducidos y los pre-vuelcan en el depósito de trabajos académicos antes de la lectura de la memoria. Entendido esto, se expone el potencial de SWORD para la integración de los depósitos con el resto de sistemas de la Universidad y los resultados de esta cooperación exportable al resto de centros de la UPC.[EN] Technical University of Catalonia has developed with the Barcelona School of Informatics, an integration system for reports and associated data transparently during the administrative process through some connectors developed jointly by the Library Service of UPC and laboratory calculation of the FIB. These connectors are based on SWORD technology using XML to encode the data entered and pre-flushed to the deposit of scholarly works before reading from memory. Understood, discussed the potential for integrating SWORD deposits with other University systems and the results of this cooperation exportable to other centers of the UPC

Low-Cost Ka-band Switchable RHCP/LHCP Antenna Array for Mobile SATCOM Terminal

(c) 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this[EN] Achieving a functional antenna for mobile satellite communications terminals in Ka-band is probably one of the most challenging tasks in current antenna engineering, particularly bearing in mind they need to be low profile and "affordable." This quest is involving many companies in the field. Our contribution represents one of such efforts. The antenna is based on a slotted waveguide array technology to maximize efficiency and it features a number of novel solutions, going from its robust polarization switching mechanism, to the use of a thin wideband polarizer and the utilization of groove gap waveguides. This communication reports the measured data of a fully functional prototype to validate its novel contributions.This work was supported by the European Space Agency through project LOCOMO under Contract 400010860913NLUS.Herranz Herruzo, JI.; Valero-Nogueira, A.; Ferrando Rocher, M.; Bernardo Clemente, B.; Vila Jiménez, A.; Lenormand, R. (2018). Low-Cost Ka-band Switchable RHCP/LHCP Antenna Array for Mobile SATCOM Terminal. IEEE Transactions on Antennas and Propagation. 66(5):2661-2666. https://doi.org/10.1109/TAP.2018.2806421S2661266666

Vehicular-to-vehicular channel characterization and measurement results

[EN] Vehicular-to-Vehicular (V2V) communications are receiving considerable attention due to the introduction of the intelligent transportation system (ITS) concept. To design, evaluate and optimize ITS applications oriented to vehicular safety based on wireless systems, the knowledge of the propagation channel is vital, in particular the path loss. From a narrowband V2V channel measurements campaign carried out in a suburban area of the city of Valencia (Spain), this paper analyzes the path loss in terms of the transmitter (Tx) and receiver (Rx) separation distance. Based on a linear slope model, values for the path loss exponent and the standard deviation of shadowing are reported. Also, the Doppler Power Spectral Density (PSD) due to the time-selective behavior is examined.This work has been funded in part by the Programa de Apoyo a la Investigación y Desarrollo de la Universitat Politècnica de València (PAID-05-10) and the Departamento Administrativo de Ciencia, Tecnología e Innovación COLCIENCIAS de Colombia.Campuzano Candel, AJ.; Fernández González, HA.; Balaguer Andrés, D.; Vila Jiménez, A.; Bernardo Clemente, B.; Rodrigo Peñarrocha, VM.; Reig, J.... (2012). Vehicular-to-vehicular channel characterization and measurement results. Waves. 4:15-24. http://hdl.handle.net/10251/54869S1524

Planar Wideband Antenna Designs for Wireless Applications in Portable Devices

[EN] This paper summarizes the research that has been developed by the authors for the last six years, concerning the design of planar wideband antennas for portable devices. Basic structures combining electric and magnetic elements are proposed, which lead to antennas with large bandwidth. Thus, by using these basic structures, a polarization diversity antenna, a wideband antenna for DVB-H applications and a wideband MIMO antenna have been proposed for wireless applications in mobile terminals. Prototypes of all the antennas have been fabricated and measured at iTEAM and/or CWC facilities.This work was supported by the Spanish Ministerio de Economía y Competitividad under the projects TEC2010-20841-C04-01 and CSD2008-00068, and by the Finnish Funding Agency for Technology and Innovation (Tekes projects AATE and MIMOTA) and its industrial partners, EB, ETS Lindgren, Nokia Devices Oulu and Pulse Finland Inc. Mr. Sonkki also would like to thank the Nokia Foundation and the Infotech Oulu Doctoral Program for financially supporting his PhD studies.Antonino Daviu, E.; Sonkki, M.; Cabedo Fabrés, M.; Ferrando Bataller, M.; Salonen, ET.; Sánchez Escuderos, D.; Herranz Herruzo, JI.... (2014). Planar Wideband Antenna Designs for Wireless Applications in Portable Devices. Waves. 6:17-28. http://hdl.handle.net/10251/52905S1728

Fire effects on C and H isotopic composition in plant biomass and soil: Bulk and particle size fractions

This work studies carbon (C) and hydrogen (H) isotope composition of plant biomass and soil organic matter (SOM) in an attempt to assess both, changes exerted by fire and possible inputs of charred materials to the soil after a wildfire. Isotope composition of bulk soil, soil particle size fractions and biomass of the dominant standing vegetation in the area (Quercus suber) from Doñana National Park (SW-Spain) were studied by isotope ratio mass spectrometry (IRMS). SOM C isotope composition indicates the occurrence of two SOM pools with different degree of alteration. Coarse soil fractions (>0.5 mm) were found 13C depleted with δ13C values close to those in leaf biomass, pointing to a predominance of poorly transformed SOM. Conversely, fine fractions (0.5 mm) displayed significant lower δ2H values than the intermediate and fine ones (<0.5 mm), again similar to those in leaf biomass (c. -80‰), whereas the fine fractions were found deuterium (2H)-enriched with significant higher δ2H values (c. 50‰), suggesting physical speciation of H depending on soil particle size. The fire produced a significant 2H depletion (Δ2H c. -10‰) in the finer fractions (<0.1 mm). The study of stable isotope analysis added new information and complements the results obtained by other proxies to better understand the effect of fire on SO

Inventario y descripción de las soluciones de accesibilidad a la web existentes para personas con discapacidad fisica y sensorial

El elemento más representativo de la nueva sociedad de la información lo constituye sin duda la World Wide Web. La Red, como es conocida popularmente, une a millones de ordenadores en todo el mundo, aportando una riqueza de información inimaginable hace pocos años y un interfaz de uso tan gráfico e intuitivo que ha significado una expansión permanente de su uso a millones de usuarios nuevos cada año. La accesibilidad Web se puede definir como la posibilidad de que un producto o servicio Web sea usado por el mayor número posible de personas, independientemente de las limitaciones del individuo o de las del contexto de uso. De acuerdo con el Tratado de Amsterdam de la Unión Europea, en aplicación de la cláusula de no-discriminación, las políticas europeas y la de los Estados miembros deberían inspirarse en el principio de no-discriminación con vistas a hacer realidad la igualdad para las personas con discapacidad. Este informe tiene como objetivo realizar un inventario de las soluciones, existentes en el mercado, tanto de software como de hardware para poder garantizar esa no discriminación de todas las personas