ANTENNALAB  Grup d'Antenes i Sistemes Radio
http://hdl.handle.net/2117/657
20170221T21:46:24Z

Balanced tangential testing for the nonconforming discretization of the ElectricField Integral Equation on open PeC surfaces
http://hdl.handle.net/2117/99435
Balanced tangential testing for the nonconforming discretization of the ElectricField Integral Equation on open PeC surfaces
Úbeda Farré, Eduard; Sekulic, Ivan; Rius Casals, Juan Manuel
Recent attention has been devoted to the development of nonconforming implementations of the ElectricField Integral Equation (EFIE), which impose no continuity constraints in the expansion of the current between adjacent
facets. These schemes, based on the facetoriented monopolarRWG set, become more versatile than the traditional edgeoriented schemes, based on the RWG set, because they simplify the discretization around junctions in composite
objects and because they can handle nonconformal triangulations. The existing nonconforming implementations tackle the numerical evaluation of the inherent hypersingular Kernel contributions of the EFIE by testing the fields over
volumetric or surface domains attached to the boundary surface inside the conductor. Hence, the application of such schemes is restricted to closed PeC surfaces. In this paper, we present a novel nonconforming implementation of the
EFIE that allows the scattering analysis of open PeC surfaces by testing the fields with a new, 'balancedtangential', strategy. We show for several examples of open PeC surfaces, infinitely long (2D) or arbitrarily shaped (3D), that the proposed scheme provides similar or slightly better accuracy than the RWGdiscretization of the EFIE and same meshing.
20170117T11:31:35Z
Úbeda Farré, Eduard
Sekulic, Ivan
Rius Casals, Juan Manuel
Recent attention has been devoted to the development of nonconforming implementations of the ElectricField Integral Equation (EFIE), which impose no continuity constraints in the expansion of the current between adjacent
facets. These schemes, based on the facetoriented monopolarRWG set, become more versatile than the traditional edgeoriented schemes, based on the RWG set, because they simplify the discretization around junctions in composite
objects and because they can handle nonconformal triangulations. The existing nonconforming implementations tackle the numerical evaluation of the inherent hypersingular Kernel contributions of the EFIE by testing the fields over
volumetric or surface domains attached to the boundary surface inside the conductor. Hence, the application of such schemes is restricted to closed PeC surfaces. In this paper, we present a novel nonconforming implementation of the
EFIE that allows the scattering analysis of open PeC surfaces by testing the fields with a new, 'balancedtangential', strategy. We show for several examples of open PeC surfaces, infinitely long (2D) or arbitrarily shaped (3D), that the proposed scheme provides similar or slightly better accuracy than the RWGdiscretization of the EFIE and same meshing.

High directivity fractal boundary microstrip patch antenna
http://hdl.handle.net/2117/98486
High directivity fractal boundary microstrip patch antenna
Borja Borau, Carmen; Font, G; Blanch Boris, Sebastián; Romeu Robert, Jordi
A novel patch antenna with a fractal boundary condition is proposed. Experimental and numerical results corroborate the fact that the fractal characteristic of the perimeter produces localised modes. This property is utilised in the design of a microstrip patch antenna with a measured directivity of 12.7 dB.
20161216T15:45:43Z
Borja Borau, Carmen
Font, G
Blanch Boris, Sebastián
Romeu Robert, Jordi
A novel patch antenna with a fractal boundary condition is proposed. Experimental and numerical results corroborate the fact that the fractal characteristic of the perimeter produces localised modes. This property is utilised in the design of a microstrip patch antenna with a measured directivity of 12.7 dB.

From field experiments to salinity products: a tribute to the contributions of Jordi Font to the SMOS mission
http://hdl.handle.net/2117/98458
From field experiments to salinity products: a tribute to the contributions of Jordi Font to the SMOS mission
Camps Carmona, Adriano José; Gabarró Prats, Carolina; VallLlossera Ferran, Mercedes Magdalena; Blanch Boris, Sebastián; Aguasca Solé, Alberto; Torres Torres, Francisco; Corbella Sanahuja, Ignasi; Duffo Ubeda, Núria; Turiel Martínez, Antonio; Portabella, Marcos; Ballabrera Poy, Joaquim; González Gambau, V.; Martinez, Justino; Villarino Villarino, Ramon; Monerris Belda, Sandra; Bosch Lluis, Xavier; Sabia, Roberto; Talone, Marco; Piles Guillem, Maria; Pablos Hernánez, Miriam; Valencia Domenech, Enric
This article summarizes some of the activities in which Jordi Font, research professor and head of the Department of Physical and Technological Oceanography, Institut de Ciències del Mar (CSIC, Spanish National Research Council) in Barcelona, has been involved as coPrincipal Investigator for Ocean Salinity of the European Space Agency Soil Moisture and Ocean Salinity (SMOS) Earth Explorer Mission from the perspective of the Remote Sensing Lab at the Universitat Politècnica de Catalunya. We have probably left out some of his many contributions to salinity remote sensing, but we hope that this review will give an idea of the importance of his work. We focus on the following issues: 1) the new accurate measurements of the sea water dielectric constant, 2) the WISE and EuroSTARRS field experiments that helped to define the geophysical model function relating brightness temperature to sea state, 3) the FROG 2003 field experiment that helped to understand the emission of sea foam, 4) GNSSR techniques for improving sea surface salinity retrieval, 5) instrument characterization campaigns, and 6) the operational implementation of the Processing Centre of Levels 3 and 4 at the SMOS Barcelona Expert Centre.
20161216T11:23:29Z
Camps Carmona, Adriano José
Gabarró Prats, Carolina
VallLlossera Ferran, Mercedes Magdalena
Blanch Boris, Sebastián
Aguasca Solé, Alberto
Torres Torres, Francisco
Corbella Sanahuja, Ignasi
Duffo Ubeda, Núria
Turiel Martínez, Antonio
Portabella, Marcos
Ballabrera Poy, Joaquim
González Gambau, V.
Martinez, Justino
Villarino Villarino, Ramon
Monerris Belda, Sandra
Bosch Lluis, Xavier
Sabia, Roberto
Talone, Marco
Piles Guillem, Maria
Pablos Hernánez, Miriam
Valencia Domenech, Enric
This article summarizes some of the activities in which Jordi Font, research professor and head of the Department of Physical and Technological Oceanography, Institut de Ciències del Mar (CSIC, Spanish National Research Council) in Barcelona, has been involved as coPrincipal Investigator for Ocean Salinity of the European Space Agency Soil Moisture and Ocean Salinity (SMOS) Earth Explorer Mission from the perspective of the Remote Sensing Lab at the Universitat Politècnica de Catalunya. We have probably left out some of his many contributions to salinity remote sensing, but we hope that this review will give an idea of the importance of his work. We focus on the following issues: 1) the new accurate measurements of the sea water dielectric constant, 2) the WISE and EuroSTARRS field experiments that helped to define the geophysical model function relating brightness temperature to sea state, 3) the FROG 2003 field experiment that helped to understand the emission of sea foam, 4) GNSSR techniques for improving sea surface salinity retrieval, 5) instrument characterization campaigns, and 6) the operational implementation of the Processing Centre of Levels 3 and 4 at the SMOS Barcelona Expert Centre.

Design of single shaped reflector antennas for synthesis of shaped contour beams using genetic algorithms
http://hdl.handle.net/2117/98391
Design of single shaped reflector antennas for synthesis of shaped contour beams using genetic algorithms
VallLlossera Ferran, Mercedes Magdalena; Rius Casals, Juan Manuel; Duffo Ubeda, Núria; Cardama Aznar, Ángel
A genetic algorithm (GA) has been developed for designing singleshaped reflector antennas for the synthesis of shaped contour beams. The graphical processing technique is used in order to obtain the antenna radiation patterns very efficiently. Results comparing with the classical conjugate gradient are included to provide validation. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 27: 358–361, 2000.
20161215T18:07:57Z
VallLlossera Ferran, Mercedes Magdalena
Rius Casals, Juan Manuel
Duffo Ubeda, Núria
Cardama Aznar, Ángel
A genetic algorithm (GA) has been developed for designing singleshaped reflector antennas for the synthesis of shaped contour beams. The graphical processing technique is used in order to obtain the antenna radiation patterns very efficiently. Results comparing with the classical conjugate gradient are included to provide validation. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 27: 358–361, 2000.

The Koch monopole: a small fractal antenna
http://hdl.handle.net/2117/98367
The Koch monopole: a small fractal antenna
Puente Baliarda, Carles; Romeu Robert, Jordi; Cardama Aznar, Ángel
Fractal objects have some unique geometrical properties. One of them is the possibility to enclose in a finite area an infinitely long curve. The resulting curve is highly convoluted being nowhere differentiable. One such curve is the Koch curve. In this paper, the behavior the Koch monopole is numerically and experimentally analyzed. The results show that as the number of iterations on the small fractal Koch monopole are increased, the Q of the antenna approaches the fundamental limit for small antennas.
20161215T15:34:42Z
Puente Baliarda, Carles
Romeu Robert, Jordi
Cardama Aznar, Ángel
Fractal objects have some unique geometrical properties. One of them is the possibility to enclose in a finite area an infinitely long curve. The resulting curve is highly convoluted being nowhere differentiable. One such curve is the Koch curve. In this paper, the behavior the Koch monopole is numerically and experimentally analyzed. The results show that as the number of iterations on the small fractal Koch monopole are increased, the Q of the antenna approaches the fundamental limit for small antennas.

Dual band fss with fractal elements
http://hdl.handle.net/2117/98359
Dual band fss with fractal elements
Romeu Robert, Jordi; RahmatSamii, Y
Experimental and computed results of a frequency selective surface (FSS) based on a certain type of fractal element are presented. The fractal element is a two iteration Sierpinski gasket dipole. Owing to the dual band behaviour of the two iteration Sierpinski gasket dipole, two stopbands are exhibited within the operating frequency band. This behaviour is obtained by arraying one simple element in a single layer frequency selective surface (FSS)
20161215T15:03:19Z
Romeu Robert, Jordi
RahmatSamii, Y
Experimental and computed results of a frequency selective surface (FSS) based on a certain type of fractal element are presented. The fractal element is a two iteration Sierpinski gasket dipole. Owing to the dual band behaviour of the two iteration Sierpinski gasket dipole, two stopbands are exhibited within the operating frequency band. This behaviour is obtained by arraying one simple element in a single layer frequency selective surface (FSS)

Infrared thermograms applied to nearfield testing
http://hdl.handle.net/2117/98358
Infrared thermograms applied to nearfield testing
González, J.M.; Aguasca Solé, Alberto; Romeu Robert, Jordi
Electromagnetic fields close to radiant structures can be measured quickly using an infrared camera. Examples of induced fields by wire antennas over a detection screen at distances shorter than one wavelength are presented. The measured thermograms agree with simulations that take into account heat propagation on the detection screen
20161215T14:57:20Z
González, J.M.
Aguasca Solé, Alberto
Romeu Robert, Jordi
Electromagnetic fields close to radiant structures can be measured quickly using an infrared camera. Examples of induced fields by wire antennas over a detection screen at distances shorter than one wavelength are presented. The measured thermograms agree with simulations that take into account heat propagation on the detection screen

Multilevel matrix decomposition algorithm for analysis of electrically large electromagnetic problems in 3d
http://hdl.handle.net/2117/98353
Multilevel matrix decomposition algorithm for analysis of electrically large electromagnetic problems in 3d
Rius Casals, Juan Manuel; Parrón Granados, Josep; Úbeda Farré, Eduard; Mosig, J R
The multilevel matrix decomposition algorithm (MLMDA) has been implemented in 3D for the solution of large electromagnetic problems. The electric field integral equation is solved for arbitrary surfaces discretized using N Rao, Wilton, and Glisson basis functions. The MLMDA accelerates the matrix–vector products in a conjugate gradient or biconjugate gradient iterative solution of the resulting system of equations. The computational cost of each iteration is proportional to N¿log2¿N for very large problems, and is particularly small for planar or piecewise planar objects. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 22: 177–182, 1999.
20161215T14:42:04Z
Rius Casals, Juan Manuel
Parrón Granados, Josep
Úbeda Farré, Eduard
Mosig, J R
The multilevel matrix decomposition algorithm (MLMDA) has been implemented in 3D for the solution of large electromagnetic problems. The electric field integral equation is solved for arbitrary surfaces discretized using N Rao, Wilton, and Glisson basis functions. The MLMDA accelerates the matrix–vector products in a conjugate gradient or biconjugate gradient iterative solution of the resulting system of equations. The computational cost of each iteration is proportional to N¿log2¿N for very large problems, and is particularly small for planar or piecewise planar objects. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 22: 177–182, 1999.

Shaped reflector antenna analysis by graphical processing methods
http://hdl.handle.net/2117/98272
Shaped reflector antenna analysis by graphical processing methods
Rius Casals, Juan Manuel; VallLlossera Ferran, Mercedes Magdalena; Salazar, C; Cardama Aznar, Ángel
20161214T16:27:03Z
Rius Casals, Juan Manuel
VallLlossera Ferran, Mercedes Magdalena
Salazar, C
Cardama Aznar, Ángel

El plan nacional de la calidad de las universidades. Los objetivos del plan: evaluacion para mejorar
http://hdl.handle.net/2117/98268
El plan nacional de la calidad de las universidades. Los objetivos del plan: evaluacion para mejorar
Jofre Roca, Lluís; Vilalta, Josep Ma
20161214T16:08:38Z
Jofre Roca, Lluís
Vilalta, Josep Ma