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  • ELECTROMAGNETIC PROPAGATION IN TUNNELS  Open access

     Izquierdo Fernández, Benjamín
    Defense's date: 2011-09-22
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

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    Introduction of wireless communications systems in railway communications are at the origin of this thesis. Ifercat, the company in charge of the development of Línia 9 of Barcelona Metro, decided that wireless systems were employed in order to increase efficiency and safety. For this reason, characterisation of ISM 5.8GHz band in tunnel environments for broad band wireless train communications becomes necessary. Tunnel environments constitute harsh environments due to humidity, obstacles, power systems, moving trains, curves¿ The Automatic Train Control system requires a 20MHz bandwidth for train-to-ground video transmission in order to get on-board information and surveillance. Given that Línia 9 was at the early stages of its development at the beginning of the study, a dual-polarised spectral simulator was developed first. Spectral techniques work in both spatial and spatial-frequency domain and are extremely adaptable to changes in the tunnel cross section as the wave front passes down the tunnel. Efficiency of this technique comes from the well-known properties of FFT algorithms. Spectral techniques provide good near-field predictions and can model different antenna configurations easily. On the other hand, boundary conditions present some issues that must be overcome. Long tunnels also represent a problem in terms of required memory space. The parabolic equation has been used to enhance the performance of spectral techniques far from the source. They complement each other well because parabolic conditions require smooth variations in one direction, thus far from the source, where only field components propagating parallel to the tunnel axis remain, in order to provide accurate results. Application of Leontovich boundary conditions ensures proper solution at the change of media and its low computational cost permits acceleration of predictions. These two techniques are then combined to verify the measurement campaigns developed at metro tunnels during the thesis. MIMO schemes are used to enhance the system throughput and simulation predictions are compared to measurements with good results. The work presented in this thesis consisted first on implementing both simulators and verifying their correct behaviour with theoretical analytical solutions. Secondly, predictions are compared with measurement campaigns carried out in Barcelona Metro environments. The study focuses on EM attenuation, field distribution, fading characterisation, antenna location and MIMO processing at the frequency band of interest.

  • Design, simulation and measurement of millimetre wave antennas for comunications and imaging

     Blanch Boris, Sebastian; Cardama Aznar, Angel; Jofre Roca, Luis; Romeu Robert, Jordi; Roqueta Crusats, Gemma; Guardiola Garcia, Marta; Serrano Calvo, Raquel; Izquierdo Fernandez, Benjamin; Alonso Valdesueiro, Javier; Capdevila Cascante, Santiago; Monsalve Carcelen, Beatriz; Diaz Tapia, Edgar; Rodrigo Lopez, Daniel; Nova Lavado, Enrique; Rius Casals, Juan-manuel
    Participation in a competitive project

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  • UWB Short-Range Bifocusing Tomographic Imaging

     Jofre Roca, Luis; Toda, A P; Montana, J M J; Carrascosa, P C; Romeu Robert, Jordi; Blanch Boris, Sebastian; Cardama Aznar, Angel
    IEEE transactions on instrumentation and measurement
    Date of publication: 2008-09
    Journal article

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  • Diccionari de Telecomunicacions

     Aguilar Igartua, Mónica; Alcober Segura, Jesus Angel; Altes Bosch, Jorge; Aragones Cervera, Xavier; Artigas Garcia, David; Bardes Llorensi, Daniel; Barlabe Dalmau, Antoni; Bragos Bardia, Ramon; Calderer Cardona, Josep; Cardama Aznar, Angel; Casademont Serra, Jordi; Casals Ibañez, Lluis; Comeron Tejero, Adolfo; Cotrina Navau, Josep; Cruz Llopis, Luis Javier de La; Dios Otin, Victor Federico; Duxans Barrobes, Helena; Esparza Martin, Oscar; Esquerra Llucià, Ignasi; Garcia Vizcaino, David; Garcies Salva, Pau; Gomez Montenegro, Carlos; Gorricho Moreno, Juan Luis; Guinjoan Gispert, Francisco; Hesselbach Serra, Xavier; Liria Righetti, Antoni; Lopez Salcedo, Jose Antonio; Madrenas Boadas, Jordi; Madueño Ruiz, María Isabel; Mestre Pons, Francesc Xavier; Monte Moreno, Enrique; Morros Rubió, Josep Ramon; Muñoz Tapia, Jose Luis; Pallares Segarra, Esteve; Pons Nin, Joan; Recolons Martos, Jaume; Rincon Rivera, David; Riu Costa, Pere Joan; Ruiz Vela, Inmaculada; Pradell Cara, Lluis; Pascual Iserte, Antonio; Prat Viñas, Luis; Rey Micolau, Francesc; Villares Piera, N. Javier
    Date of publication: 2007-03
    Book

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  • UWB Short Range Imaging

     Papió, A; Jornet, J M; Ceballos, P; Romeu Robert, Jordi; Blanch Boris, Sebastian; Cardama Aznar, Angel; Jofre Roca, Luis
    3RD INTERNATIONAL CONFERENCE ON ELECTROMAGNETIC NEAR-FIELD CHARACTERIZATION & IMAGING
    Presentation of work at congresses

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  • Bidirectional artificial magnetic reflectors at microwave frequencies.

     Ferrer, P J; González Arbesú, José María; Romeu Robert, Jordi; Cardama Aznar, Angel
    Microwave and optical technology letters
    Date of publication: 2007-08
    Journal article

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  • Gap fillers coverage prediction at S frequency band

     Capdevila, S; Jofre Roca, Luis; Cardama Aznar, Angel; Blanch Boris, Sebastian; Romeu Robert, Jordi; Roqueta, G
    Simposium Nacional de la Unión Científica Internacional de Radio
    Presentation of work at congresses

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  • Sensitivity Study of the Microwave Spiralimetric Imaging

     Jofre Roca, Luis; Blanch Boris, Sebastian; Cardama Aznar, Angel; Rius Casals, Juan-manuel; Torner Sabata, Lluis
    18th International Conference on Applied Electro­mag­netics and Communications
    Presentation of work at congresses

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  • Pre-fractal antennas and resonators: Miniaturization, efficiency and bandwidth limitations

     Rius Casals, Juan-manuel; González Arbesú, José María; Collado Gomez, Juan Carlos; Romeu Robert, Jordi; O'callaghan Castella, Juan Manuel; Mosig, J R; Cardama Aznar, Angel
    Fractals in Engineering V
    Presentation of work at congresses

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  • Benvinguda als participants en l'obertura de l'acte com Director del dep. de TSC

     Cardama Aznar, Angel
    International Conference on Electromagnetic Near-Field Characterization & Imaging
    Presentation's date: 2005-06-30
    Presentation of work at congresses

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  • Integrated RF-MEMS antenna systems for wireless devices

     Jofre Roca, Luis; Blanch Boris, Sebastian; Cardama Aznar, Angel; Dossche, S; González Arbesú, José María; Pradell Cara, Lluis; O'callaghan Castella, Juan Manuel; Rius Casals, Juan-manuel; Romeu Robert, Jordi; Chang, C H; Qian, J Y; Bachman, M; Li, G P; Flaviis, F; Cetiner, Bedri Artug
    5th Workshop on MEMS for MillimeterWave Communications (MEMSWAVE)
    Presentation of work at congresses

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  • Conclusions and results of the Fractalcoms project: exploring the limits of fractal electrodynamics for the future telecommunication technologies

     González Arbesú, José María; Rius Casals, Juan-manuel; Cardama Aznar, Angel; Heldring, Alexander; Ubeda Farre, Eduardo; Romeu Robert, Jordi; Mosig, R; Cabot, E; Gómez, R; Rubio, J.; Pantoja, M; Giona, M; Burghignoli, P; Bugeda Castelltort, Gabriel; Riera, M; Parrón, J
    27th ESA Antenna Technology Workshop on Innovative Periodic Antennas: Electromagnetic Bandgap, Left-handed Materials, Fractal and Frequency Selective Surfaces
    Presentation of work at congresses

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  • TEC2004-04866-C04-02 REDES MOVILES DISTRIBUIDAS PARA COMUNICACIONES MULTIUSUARIO

     Blanch Boris, Sebastian; Cardama Aznar, Angel; Jofre Roca, Luis; Romeu Robert, Jordi; Rius Casals, Juan-manuel
    Participation in a competitive project

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  • Antenas

     Cardama Aznar, Angel; Jofre Roca, Luis; Rius Casals, Juan-manuel; Romeu Robert, Jordi; Blanch Boris, Sebastian; Ferrando, M
    Date of publication: 2004-07-31
    Book

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  • Conclusions and results of the Fractalcoms Project: exploring the limits of Fractal Electrodynamics for the future telecommunication technologies

     Rius Casals, Juan-manuel; González Arbesú, José María; Romeu Robert, Jordi; Cardama Aznar, Angel; Heldring, Alexander; Ubeda Farre, Eduardo; Mosig, R; Cabot, E; Gómez, R; Rubio, J.; Fernández, M; Giona, M; Burghignoli, P; Bugeda Castelltort, Gabriel; Riera, M
    IEEE INTERNATIONAL ANTENNAS AND PROPAGATION SYMPOSIUM (AP-S)
    Presentation of work at congresses

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    Accurate numerical modeling of the TARA reflector system  Open access

     Heldring, Alexander; Rius Casals, Juan-manuel; Ligthart, L P; Cardama Aznar, Angel
    IEEE transactions on antennas and propagation
    Date of publication: 2004-07
    Journal article

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    The radiation pattern of the large parabolic reflectors of the Transportable Atmospheric RAdar system (TARA), developed at Delft University of Technology, has been accurately simulated. The electric field integral equation (EFIE) formulation has been applied to a model of the reflectors including the feed housing and supporting struts, discretised using the method of moments. Because the problem is electrically large (the reflector has a diameter of 33λ) and nonsymmetrical, this lead to a badly conditioned linear system of approximately half a million unknowns. In order to solve this system, an iterative solver (generalized minimum residual method) was used, in combination with the multilevel fast multipole method. Because of the bad conditioning, the system could only be solved by using a huge preconditioner. A new block-incomplete LU preconditioner (ILU) algorithm has been employed to allow for efficient out-of-computer core memory preconditioning.

  • Progress towards superconducting optoelectronic modulators

     O'callaghan Castella, Juan Manuel; Torner Sabata, Lluis; Pous Andres, Rafael; Cardama Aznar, Angel; Fontcuberta, J; Bosso, S; Perasso, A
    Date of publication: 2003-05-31
    Book chapter

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  • Premi Nacional de Telecomunicacions 2003

     Bara Temes, Francisco Javier; Cardama Aznar, Angel; Aguasca Sole, Alberto; Artigas Garcia, David; Belmonte Molina, Aniceto; Berenguer Sau, Jordi; Blanch Boris, Sebastian; Broquetas Ibars, Antoni; Camps Carmona, Adriano Jose; Canal Bienzobas, Fernando; Comeron Tejero, Adolfo; Corbella Sanahuja, Ignasi; Dios Otin, Victor Federico; Duffo Ubeda, Nuria; Elias Fuste, Antonio; Fabregas Canovas, Francisco Javier; Garcia Mateos, Jorge; Hernandez Marco, Jordi; Jofre Roca, Luis; Mallorqui Franquet, Jordi Joan; O'callaghan Castella, Juan Manuel; Perez Torres, Juan; Pous Andres, Rafael; Pradell Cara, Lluis; Puente Baliarda, Carles; Recolons Martos, Jaume; Rius Casals, Juan-manuel; Rocadenbosch Burillo, Francisco; Rodriguez Gomez, Alejandro Antonio; Romeu Robert, Jordi; Santos Blanco, María Concepción; Torner Sabata, Lluis; Torres Torres, Francisco; Vall-llossera Ferran, Mercedes Magdalena; Garcia Vizcaino, David; Sicard, Michaël
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  • Accurate numerical modeling of the TARA reflector system

     Heldring, Alexander; Rius Casals, Juan-manuel; Cardama Aznar, Angel
    12th International Conference on Antennas and Propagation
    Presentation of work at congresses

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  • Antenas

     Cardama Aznar, Angel; Jofre Roca, Luis; Rius Casals, Juan-manuel; Romeu Robert, Jordi; Blanch Boris, Sebastian; Ferrando, M
    Date of publication: 2002-11-30
    Book

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    Near field in the vicinity of wireless base-station antennas: an exposure compliance approach  Open access

     Blanch Boris, Sebastian; Romeu Robert, Jordi; Cardama Aznar, Angel
    IEEE transactions on antennas and propagation
    Date of publication: 2002-05
    Journal article

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    Great social concern has risen about the potential health hazard of living near a cellular telephony base-station antenna, and certain technical questions have been posed on the appropriate way to measure exposure in its vicinity. In this paper, standard spherical near–near field transformation is proposed to obtain the electromagnetic field close to the antenna in free space conditions. The field obtained in this way allows to define an exclusion zone from the exposure compliance point of view, but also makes possible to bound the error committed by standard field measurement procedures. Furthermore, the visualization of the electromagnetic field in the proximity of the antenna in free space conditions, allows to define clearance templates that have to be met in the siting of the antenna in complex environments in order not to obstruct its main beam.

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    Synthesis of large low-redundancy linear arrays  Open access

     Camps Carmona, Adriano Jose; Cardama Aznar, Angel; Infantes, D
    IEEE transactions on antennas and propagation
    Date of publication: 2001-12
    Journal article

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    Aperture synthesis interferometric radiometers can overcome mass, weight and mechanical scan limitations of present-day radiometers. A full antenna array is “thinned” by eliminating selected antennas, while keeping all possible antenna separations. This brief describes a new technique for the direct synthesis of low-redundancy large arrays, consisting in growing small arrays by inserting a seed repeatedly. This technique has achieved the largest thinned arrays with the least redundancy reported in the literature.

  • Complemento al proyecto IST-2001-33055 FRACTALCOMMS

     Rius Casals, Juan-manuel; Cardama Aznar, Angel; Romeu Robert, Jordi; Blanch Boris, Sebastian; Heldring, Alexander
    Participation in a competitive project

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  • EXPLORING THE LIMITS OF FRACTAL ELECTRODYNAMICS FOR THE FUTURE TELECOMUNICATION TECHNOLOGIES

     Romeu Robert, Jordi; Rius Casals, Juan-manuel; Cardama Aznar, Angel; Blanch Boris, Sebastian; González Arbesú, José María; Jofre Roca, Luis; Heldring, Alexander; Ubeda Farre, Eduardo
    Participation in a competitive project

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  • Properties of fractal shaped antennas

     Romeu Robert, Jordi; Aguasca Sole, Alberto; Blanch Boris, Sebastian; Cardama Aznar, Angel
    24th ESTEC Antenna Workshop on Innovative Periodic Antennas:Photonic Bandgap, Fractal and Frequency Selective Surfaces
    Presentation of work at congresses

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  • Permittivity and temperature characterization of rubber compounds under high power microwaves

     Mallorqui Franquet, Jordi Joan; Aguasca Sole, Alberto; Cardama Aznar, Angel
    Electronics Letters
    Date of publication: 2001-06
    Journal article

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  • Atmospheric Tomography Using Satellite Radio Signals  Open access  awarded activity

     FLORES JIMENEZ, ALEJANDRO
    Defense's date: 2000-02-04
    Department of Signal Theory and Communications, Universitat Politècnica de Catalunya
    Theses

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    Los sistemas de posicionamiento global GNSS (GPS y GLONASS) se han convertido en una herramienta básica para obtener medidas geodésicas de la Tierra y en una fuente de datos para el estudio atmosférico. Proporcionan cobertura global y permanente y por la precisión, exactitud y densidad de datos, las señales radio transmitidas pueden ser usadas para la representación espacio-temporal de la atmósfera.La tecnología de los receptores GPS ha evolucionado con una sorprendente rapidez, resultando en instrumentos con suficiente calidad de medida para ser utilizados en estudios geodésicos, comparables a los resultados de técnicas como la interferometría de muy larga base (VLBI), y estudios atmosféricos cuyos resultados pueden ser usados en meteorología.En la tesis Tomografía Atmosférica utilizando Señales Radio de Satélites nos hemos centrado en el uso del sistema GPS por disponer mayor cantidad y calidad de referencias y herramientas para el procesado de los datos. No obstante, se ha demostrado la posibilidad de extender el concepto a cualquier sistema de transmisión radio desde satélite como sondeador atmosférico. La estructura de la tesis se ha dividido en dos áreas: el procesado de datos GPS para extraer información referente a los parámetros atmosféricos de interés, y la aplicación de técnicas tomográficas para la resolución de problemas inversos. En particular, la tomografía se ha aplicado a la ionosfera y la atmósfera neutra. En ambos casos, los resultados tienen un innegable impacto socio-económico: a) la monitorización del estado ionosférico es fundamental por las perturbaciones que la ionosfera provoca en las transmisiones radio que la atraviesan, y b) la estimación del contenido de vapor de agua de la troposfera es de utilidad en la predicción meteorológica y climática.La tomografía ionosférica se empezó a desarrollar usando únicamente datos de la red global IGS. A continuación se mejoró la resolución vertical mediante la utilización de datos de ocultaciones del experimento GPS/MET. La mejora de la resolución se ve limitada a la región en la que estos datos existen. Finalmente, se utilizaron datos de altimetría del satélite TOPEX/POSEIDON para mejorar los mapas y para demostrar la posibilidad de calibración instrumental de los altímetros radar usando técnicas tomográficas.La aplicación a la troposfera se obtuvo tras la mejora y refinamiento tanto del procesado de datos GPS como del proceso de inversión tomográfica. Los primeros resultados se obtuvieron mediante los datos experimentales de la red permanente en Kilauea, Hawaii, por la configuración particular de los receptores. Estos resultados demostraban la capacidad de obtener representaciones espacio-temporales de la troposfera mediante datos GPS. El análisis de los datos de la campaña REGINA, realizada en el Onsala Space Observatory, nos permitió la descripción de un fenómeno meteorológico complejo mediante la tomografía troposférica usando datos GPS y su verificación por comparación directa con medidas realizadas por radiosondeo.En conclusión, se ha demostrado la posibilidad de aplicar tomografía a la atmósfera utilizando señales radio de satélites y, en particular, la constelación GPS.

    The Global Navigation Satellite Systems (GPS and GLONASS) have become a basic tool to obtain geodetic measurements of the Earth and a source of data for the atmospheric analysis. Since these systems provide a global, dense and permanent coverage with precise and accurate data, the radio signals they transmit can be used for the spatio-temporal representation of the atmosphere.GPS receivers technology has evolved at a surprising pace: nowadays they have sufficient measurement quality as to be used in geodetic studies, together with other techniques such as the Very Long Base Interferometry (VLBI), and in atmospheric studies whose results can be input into meteorological analysis.In the thesis "Atmospheric Tomography Using Satellite Radio Signals" we have focused on the use of GPS system due to the better quality and quantity of references and tools for the data processing. This notwithstanding, we have proven the possibility to broaden the concept to include any other radio signal transmitting satellite system as an atmospheric sounder. The thesis has been divided into two main areas: GPS data processing to extract the information related to the atmospheric parameters under study, and the implementation of tomographic techniques to the solution of the inverse problem. In particular, tomography has been applied to the ionosphere and to the neutral atmosphere. In both cases, results have a socio-economic impact: a) monitoring the ionosphere is essential for radio transmissions across it because of the perturbations it may produce on the signal, and b) estimating water vapour content in the troposphere is highly useful for meteorological and climate forecastFor the ionospheric tomography we initally only used the data from the global IGS network. Vertical resolution was afterwards improved using the occultation data of the GPS/MET experiment. The improvement, however, was limited to the region where these data existed. Finally, we used altimeter data from the TOPEX/POSEIDON satellite to improve the maps and to prove the radar altimeter calibration capability of the tomographic technique.The application to the troposphere was possible after the improvement and refinement of both the GPS data processing and the tomographic inversion. The first results were obtained using the experimental data from the permanent network in Kilauea, Hawaii. The particular geometry of the receivers in this local network made it highly suited for these initial results, which proved the possibility of obtaining spatio-temporal representations of the troposphere using GPS data. The data analysis of the REGINA campaign, which took place at the Onsala Space Observatory, provided the description of a complex meteorological phenomenon using only GPS data tropospheric tomography. We verified the results with a direct comparison with radiosonde data.Concluding, we have demonstrated the capabilities of atmospheric tomography using satellite radio signals, with particular emphasis on the GPS signals.

  • Analysis of Reflector and Horn Antennas Using MultiLevel Fast Multipole Algorithm

     Heldring, Alexander; Rius Casals, Juan-manuel; Parron Granados, Josep; Cardama Aznar, Angel; Ligthart, L P
    International Conference on Computational Plasticity
    Presentation of work at congresses

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  • Modos directivos en antenas de parche con perímetro fractal

     Romeu Robert, Jordi; Borja, C; Blanch Boris, Sebastian; Cardama Aznar, Angel
    Simposium Nacional de la Unión Científica Internacional de Radio
    Presentation of work at congresses

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  • Analysis of reflector and horn antennas using multilevel fast multipole algorithm

     Heldring, Alexander; Rius Casals, Juan-manuel; Parron, J; Cardama Aznar, Angel; Ligthart, L P
    Millenium Conference on Antennas and Propagation (AP2000)
    Presentation of work at congresses

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  • On the magnetic field integral equation discretized in linear triangles

     Ubeda Farre, Eduardo; Rius Casals, Juan-manuel; Parron, J; Cardama Aznar, Angel
    International Conference on Computational Plasticity
    Presentation of work at congresses

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  • Development of high temperature superconducting optoelectronic modulators

     Rozan, Edouard; Collado Gomez, Juan Carlos; O'callaghan Castella, Juan Manuel; Fontcuberta, J; Torner Sabata, Lluis; Prat Goma, Josep; Pous Andres, Rafael; Cardama Aznar, Angel; Bosso, S; Perasso, A
    Microwave Symposium
    Presentation of work at congresses

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  • Genetic Algorithm versus Conjugate Gradient for Designing Reflector Antennas

     Vall-llossera Ferran, Mercedes Magdalena; Rius Casals, Juan-manuel; Duffo Ubeda, Nuria; Cardama Aznar, Angel
    Microwave Symposium
    Presentation of work at congresses

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  • The Koch monopole: a small fractal antenna

     Puente Baliarda, Carles; Romeu Robert, Jordi; Cardama Aznar, Angel
    IEEE transactions on antennas and propagation
    Date of publication: 2000-11
    Journal article

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  • Design of single shaped reflector antennas for synthesis of shaped contour beams using genetic algorithms

     Vall·Llossera, M; Vall-llossera Ferran, Mercedes Magdalena; Rius Casals, Juan-manuel; Duffo Ubeda, Nuria; Cardama Aznar, Angel
    Microwave and optical technology letters
    Date of publication: 2000-12
    Journal article

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  • Premi Ciutat de Barcelona, modalitat investigacio tecnologica

     Puente Baliarda, Carles; Romeu Robert, Jordi; Cardama Aznar, Angel
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  • Antenas

     Cardama Aznar, Angel; Jofre Roca, Luis; Rius Casals, Juan-manuel; Romeu Robert, Jordi; Blanch Boris, Sebastian
    Date of publication: 1999-12-31
    Book

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  • Frontiers in elecromagnetics

     Puente Baliarda, Carles; Romeu Robert, Jordi; Cardama Aznar, Angel
    Date of publication: 1999-12-31
    Book

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  • Application of the conjugate gradient method to a self-matching network for industrial microwave heating antennas

     Mallorqui Franquet, Jordi Joan; Aguasca Sole, Alberto; Cardama Aznar, Angel; Pages, R; Haro, J M
    IEEE Antennas and Propagation Society International Symposium '99
    Presentation of work at congresses

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  • Analysis of reflector and horn antennas using multilevel fast multipole algorithm

     Heldring, Alexander; Rius Casals, Juan-manuel; Parron, J; Cardama Aznar, Angel; Ligthart, L P
    Millenium Conference on Antennas and Propagation (AP2000)
    Presentation of work at congresses

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  • Shaped reflector antenna analysis by graphical processing methods

     Rius Casals, Juan-manuel; Vall-llossera Ferran, Mercedes Magdalena; Salazar, C; Cardama Aznar, Angel
    Applied Computational Electromagnetics Society journal
    Date of publication: 1999-07
    Journal article

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    Automatic self-matching network for industrial microwave heating based on the conjugate gradient algorithm  Open access

     Mallorqui Franquet, Jordi Joan; Aguasca Sole, Alberto; Cardama Aznar, Angel; Pagès, R; Haro Sanchez, Jose
    Electronics Letters
    Date of publication: 1999-02
    Journal article

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    An automatic matching network has been implemented using a waveguide magic T with two sliding short circuit stubs whch are adjusted by a microcontroller running a conjugate gradient algorithm. The inclusion of this device in an industrial heating system allows high energetic efficiency of the oven to be maintained despite changes in the load.

  • Premi sobre Tecnologies de la informació

     Puente Baliarda, Carles; Romeu Robert, Jordi; Cardama Aznar, Angel
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  • TIC98-1037-C03-03 ANALISIS DE ANTENAS DE BANDA ANCHA Y MULTIBANDA

     Rius Casals, Juan-manuel; Cardama Aznar, Angel; Vall-llossera Ferran, Mercedes Magdalena; Mallorqui Franquet, Jordi Joan
    Participation in a competitive project

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  • INCO PROJECT 972561 AMED-AIRBORNE REMOTE SENSING TECHNIQUES SIMULATION FOR ASSESMENT MONITORING AND SURVEILLANCE OF SOUTH-MEDITERRANEAN MARITIME ECOSYSTEMS

     Rius Casals, Juan-manuel; Cardama Aznar, Angel; Broquetas Ibars, Antoni
    Participation in a competitive project

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  • Antenes

     Cardama Aznar, Angel; Jofre Roca, Luis; Rius Casals, Juan-manuel; Romeu Robert, Jordi; Blanch Boris, Sebastian
    Date of publication: 1998-02-28
    Book

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  • Antenas

     Cardama Aznar, Angel; Jofre Roca, Luis; Rius Casals, Juan-manuel; Romeu Robert, Jordi; Blanch Boris, Sebastian
    Date of publication: 1998-09-30
    Book

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  • Error estimation in the numerical computation of the TARA reflector far side lobes

     Rius Casals, Juan-manuel; Heldring, Alexander; Parrón, J; Cardama Aznar, Angel
    Date: 1998-11
    Report

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    On the behavior of the Sierpinski multiband fractal antenna  Open access

     Puente Baliarda, Carles; Romeu Robert, Jordi; Pous Andres, Rafael; Cardama Aznar, Angel
    IEEE transactions on antennas and propagation
    Date of publication: 1998-04
    Journal article

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    The multiband behavior of the fractal Sierpinski antenna is described. Due to its mainly triangular shape, the antenna is compared to the well-known single-band bow-tie antenna. Both experimental and numerical results show that the self-similarity properties of the fractal shape are translated into its electromagnetic behavior. A deeper physical insight on such a behavior is achieved by means of the computed current densities over the antenna surface, which also display some similarity properties through the bands.