Articles de revista
http://hdl.handle.net/2117/653
2017-02-22T20:04:44ZCircuit model for coplanar-slotline tees
http://hdl.handle.net/2117/98490
Circuit model for coplanar-slotline tees
Ribó i Pal, Miquel; Pradell i Cara, Lluís
Coplanar-slotline tees have been used in a number of microwave circuits, although no complete models were available to explain their behavior. In this letter, a new
2016-12-16T15:56:41ZRibó i Pal, MiquelPradell i Cara, LluísCoplanar-slotline tees have been used in a number of microwave circuits, although no complete models were available to explain their behavior. In this letter, a newFrom 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; Vall-Llossera 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 co-Principal 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) GNSS-R 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.
2016-12-16T11:23:29ZCamps Carmona, Adriano JoséGabarró Prats, CarolinaVall-Llossera Ferran, Mercedes MagdalenaBlanch Boris, SebastiánAguasca Solé, AlbertoTorres Torres, FranciscoCorbella Sanahuja, IgnasiDuffo Ubeda, NúriaTuriel Martínez, AntonioPortabella, MarcosBallabrera Poy, JoaquimGonzález Gambau, V.Martinez, JustinoVillarino Villarino, RamonMonerris Belda, SandraBosch Lluis, XavierSabia, RobertoTalone, MarcoPiles Guillem, MariaPablos Hernánez, MiriamValencia Domenech, EnricThis 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 co-Principal 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) GNSS-R 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.Circuit model for a coplanar-slotline cross
http://hdl.handle.net/2117/98372
Circuit model for a coplanar-slotline cross
Miquel, Ribó; Pradell i Cara, Lluís
A new 6-port
2016-12-15T15:51:45ZMiquel, RibóPradell i Cara, LluísA new 6-portGeneralized transverse resonance analysis of planar discontinuities considering the edge effect
http://hdl.handle.net/2117/98370
Generalized transverse resonance analysis of planar discontinuities considering the edge effect
Barlabe Dalmau, Antoni; Comerón Tejero, Adolfo; Pradell i Cara, Lluís
Abstract:
Mode-matching related techniques such as the Generalized Transverse Resonance Method (GTR) suffer from the relative convergence phenomenon. To reduce its influence, we present a technique consisting of the application of basis functions incorporating the singular behavior of fields at edges and an optimal modal ratio. We present the results obtained analyzing a uniform finline and a short-circuited finline which demonstrate the minimization of the relative convergence phenomenon, allowing a fast and accurate analysis on a low-cost personal computer.
2016-12-15T15:42:37ZBarlabe Dalmau, AntoniComerón Tejero, AdolfoPradell i Cara, LluísAbstract:
Mode-matching related techniques such as the Generalized Transverse Resonance Method (GTR) suffer from the relative convergence phenomenon. To reduce its influence, we present a technique consisting of the application of basis functions incorporating the singular behavior of fields at edges and an optimal modal ratio. We present the results obtained analyzing a uniform finline and a short-circuited finline which demonstrate the minimization of the relative convergence phenomenon, allowing a fast and accurate analysis on a low-cost personal computer.Circuit model for mode conversion in coplanar waveguide assymmetric shunt impedances
http://hdl.handle.net/2117/98361
Circuit model for mode conversion in coplanar waveguide assymmetric shunt impedances
Miquel, Ribó; Pradell i Cara, Lluís
A new 'circuit model' for the conversion between even and odd modes in coplanar waveguide asymmetric shunt impedances is presented. The model is based on the separation of modes into two input and two output ports. In contrast to previous work, it allows a quantitative analysis of the energy exchange between modes.
2016-12-15T15:06:57ZMiquel, RibóPradell i Cara, LluísA new 'circuit model' for the conversion between even and odd modes in coplanar waveguide asymmetric shunt impedances is presented. The model is based on the separation of modes into two input and two output ports. In contrast to previous work, it allows a quantitative analysis of the energy exchange between modes.Numerical optimization of hybrid dielectric/HTS resonators for surface impedance evaluation of HTS films
http://hdl.handle.net/2117/98257
Numerical optimization of hybrid dielectric/HTS resonators for surface impedance evaluation of HTS films
Collado Gómez, Juan Carlos; Gonzalo, David; Rozan, Edouard; O'Callaghan Castellà, Juan Manuel; Sans, C
This work describes an alternative to the traditional dielectric resonator topology used for measuring surface impedance in high temperature superconducting (HTS) films. A gap is introduced above the dielectric so that only the lower film is in direct contact with it. This arrangement has been used extensively for mechanical tuning of dielectric resonators and, when used for surface impedance measurement, it can be designed to make the losses in the upper film small relative to the overall resonator losses. Then, measured results are mostly due to one of the films and not the average of two. The specifics of a resonator design for measuring 2-inch wafers are presented. An analysis and optimization of the resonator is done using a numerically efficient mode-matching algorithm.
2016-12-14T15:24:52ZCollado Gómez, Juan CarlosGonzalo, DavidRozan, EdouardO'Callaghan Castellà, Juan ManuelSans, CThis work describes an alternative to the traditional dielectric resonator topology used for measuring surface impedance in high temperature superconducting (HTS) films. A gap is introduced above the dielectric so that only the lower film is in direct contact with it. This arrangement has been used extensively for mechanical tuning of dielectric resonators and, when used for surface impedance measurement, it can be designed to make the losses in the upper film small relative to the overall resonator losses. Then, measured results are mostly due to one of the films and not the average of two. The specifics of a resonator design for measuring 2-inch wafers are presented. An analysis and optimization of the resonator is done using a numerically efficient mode-matching algorithm.Circuit model for slotline-to-coplanar waveguide asymmetrical transitions
http://hdl.handle.net/2117/98245
Circuit model for slotline-to-coplanar waveguide asymmetrical transitions
Ribó i Pal, Miquel; Cruz, J De La; Pradell i Cara, Lluís
A new 'circuit-model' for slotline-to-coplanar waveguide asymmetrical transitions is presented and applied to the design of slotline resonators. The model, based on the separation of coplanar-waveguide (CPW) modes into two different ports, overcomes limitations of previous models because it explains the transition behaviour even if CPW air-bridges are not used.
2016-12-14T15:07:57ZRibó i Pal, MiquelCruz, J De LaPradell i Cara, LluísA new 'circuit-model' for slotline-to-coplanar waveguide asymmetrical transitions is presented and applied to the design of slotline resonators. The model, based on the separation of coplanar-waveguide (CPW) modes into two different ports, overcomes limitations of previous models because it explains the transition behaviour even if CPW air-bridges are not used.La fotònica revoluciona les telecomunicacions
http://hdl.handle.net/2117/98038
La fotònica revoluciona les telecomunicacions
Torner Sabata, Lluís; Pérez Torres, Juan; Artigas García, David; Santos Blanco, M. Concepción
2016-12-12T15:01:30ZTorner Sabata, LluísPérez Torres, JuanArtigas García, DavidSantos Blanco, M. ConcepciónExtraction of noise parameters of transistor using a spectrum analyser and 50 /spl Theta/ noise figure measurements only
http://hdl.handle.net/2117/98027
Extraction of noise parameters of transistor using a spectrum analyser and 50 /spl Theta/ noise figure measurements only
Lázaro Guillén, Antoni; Pradell i Cara, Lluís
A method for measuring the four noise parameters of a transistor in the microwave range using a configuration based on a conventional spectrum analyser is presented. In contrast to previous methods, it requires wideband 50 /spl Theta/ noise-figure measurements only. The method features an accuracy similar to that of noise figure meters at a much higher measurement speed and lower cost.
2016-12-12T14:05:30ZLázaro Guillén, AntoniPradell i Cara, LluísA method for measuring the four noise parameters of a transistor in the microwave range using a configuration based on a conventional spectrum analyser is presented. In contrast to previous methods, it requires wideband 50 /spl Theta/ noise-figure measurements only. The method features an accuracy similar to that of noise figure meters at a much higher measurement speed and lower cost.Walking solitons
http://hdl.handle.net/2117/97891
Walking solitons
Torner Sabata, Lluís; Santos Blanco, M. Concepción; Mihalache, Dumitru; Mazilu, D; Crasovan, L C
By and large, optical
2016-12-07T16:04:24ZTorner Sabata, LluísSantos Blanco, M. ConcepciónMihalache, DumitruMazilu, DCrasovan, L CBy and large, optical