Exploració per autor "Pradell i Cara, Lluís"
Ara es mostren els items 98-117 de 145
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Ill conditioning loci in noise parameter determination
O'Callaghan Castellà, Juan Manuel; Alegret, A.; Pradell i Cara, Lluís; Corbella Sanahuja, Ignasi (IEE-INST ELEC ENG, 1996-08-01)
Article
Accés obertAn analysis of the problem of noise parameter determination is carried out. It is found that the mathematical problem is ill-posed if all the source reflection coefficients (Γs) used in the measurements fall onto a line, ... -
Ill conditioning loci in noise parameter determination
O'Callaghan Castellà, Juan Manuel; Alegret Ginesta, Alexandre; Pradell i Cara, Lluís; Corbella Sanahuja, Ignasi (IEE-INST ELEC ENG, 1996-08-01)
Article
Accés obertAn analysis of the problem of noise parameter determination is carried out. It is found that the mathematical problem is ill-posed if all the source reflection coefficients (Γs) used in the measurements fall onto a line, ... -
K-band RF-MEMS uniplanar reconfigurable-bandwidth bandpass filter using multimodal immittance inverters
Contreras Lizarraga, Adrián Arturo; Ribó i Pal, Miquel; Pradell i Cara, Lluís; Casals Terré, Jasmina; Giacomozzi, Flavio; Iannacci, Jacopo (Institution of Electrical Engineers, 2013-05-23)
Article
Accés restringit per política de l'editorialA K-band RF-MEMS uniplanar second-order bandpass filter with reconfigurable bandwidth is presented. The filter is based on inductively-coupled half-wavelength slotline resonators and CPW-slotline multimodal immittance ... -
Lens based switched beam antenna for a 5G smart repeater
Romeu Robert, Jordi; Blanch Boris, Sebastián; Pradell i Cara, Lluís; Barlabe Dalmau, Antoni; Rius Casals, Juan Manuel; Albert Galí, Miquel; Jofre Roca, Lluís; Mazzucco, Christian; Flamini, Roberto (2023-10)
Article
Accés obertA 16 switched beam lens based antenna with a coverage area of ±30° in the horizontal plane and from 0 to -20° in the vertical plane has been built and tested. The intended use of the antenna is as part of a smart repeater ... -
Low voltage capacitive and Ohmic RF-MEMS Switches
Contreras Lizarraga, Adrián Arturo; Casals Terré, Jasmina; Pradell i Cara, Lluís; Giacomozzi, Flavio; Colpo, Sabrina; Iannacci, Jacopo; Ribó, Miquel (2012)
Text en actes de congrés
Accés restringit per política de l'editorialThis work presents experimental results of capacitive and ohmic-contact RF-MEMS switches. The suspension has been designed to compensate stress-gradient effects, and to obtain low pull-in voltages. The measured actuation ... -
Lugares geométricos de mal condicionamiento y constelaciones de admitancias de fuentes utilizadas en la extracción de parámetros de ruido
O'Callaghan Castellà, Juan Manuel; Pradell i Cara, Lluís; Corbella Sanahuja, Ignasi (1996)
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Measurement of on-wafer transistor noise parameters without a tuner using unrestricted noise sources
Lázaro Guillén, Antoni; Maya Sánchez, Mª del Carmen; Pradell i Cara, Lluís (HORIZON HOUSE PUBLICATIONS INC, 2002-03-31)
Article
Accés obertThe authors present a method for calibrating the four noise parameters of a noise receiver which does not require a tuner The method permits using general (mismatched) noise sources, which may present very different source ... -
Medida de parámetros de ruido de transistores HEMT a partir de medidas de ruido con fuente adapatada
Lázaro Guillén, Antoni; Pradell i Cara, Lluís; O'Callaghan Castellà, Juan Manuel; Pérez Pueyo, Rosanna; Soneira Ferrando, M. José (1998)
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Medida de parámetros S de transistores chip hasta 40 ghz utilizando calibración TRL
Pradell i Cara, Lluís; Sabater, C.; Artal, E.; Comerón Tejero, Adolfo; Bará Temes, Francisco Javier; Corbella Sanahuja, Ignasi; Fortuny, J. (1990)
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Method for measuring noise parameters of microwave two-port
Lázaro Guillén, Antoni; Pradell i Cara, Lluís; O'Callaghan Castellà, Juan Manuel (IEE, 1998-06-30)
Article
Accés obertA new tuner-based method for measuring the four noise-parameters of a two-port is proposed. It makes use of a novel measurement ratio that includes noise powers and mismatch factors simultaneously. In contrast to previous ... -
Method for measuring noise parameters of microwave two-port
Lázaro Guillén, Antoni; Pradell i Cara, Lluís; O'Callaghan Castellà, Juan Manuel (Institution of Electrical Engineers, 1998-06)
Article
Accés obertA new tuner-based method for measuring the four noise-parameters of a two-port is proposed. It makes use of a novel measurement ratio that includes noise powers and mismatch factors simultaneously. In contrast to previous ... -
Método para la determinación de los parámetros de ruido a partir de medidas precisas de factor de ruido y parámetros S
Borràs, S.; Pradell i Cara, Lluís; Comerón Tejero, Adolfo; Artal, E. (1990)
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Método simplificado de extracción de las resistencias parásitas de MESFET's
Lanero, J M; Purroy, F; Lázaro Guillén, Antoni; Pradell i Cara, Lluís (J.M. PÁEZ BORRALLO, J.I. ALONSO MONTES SERVICIO PUBLICACIONES ETSIT - MADRID, 1996)
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Microstrip-fed 3D-printed H-sectorial horn phased array
Zhou, Ivan; Pradell i Cara, Lluís; López Villegas, José María; Vidal Martínez, Neus; Albert Gali, Miquel; Jofre Roca, Lluís; Romeu Robert, Jordi (Multidisciplinary Digital Publishing Institute (MDPI), 2022-07-16)
Article
Accés obertA 3D-printed phased array consisting of four H-Sectorial horn antennas of 200 g weight with an ultra-wideband rectangular-waveguide-to-microstrip-line transition operating over the whole LMDS and K bands (24.25–29.5 GHz) ... -
Miniature switchable millimeter-wave BiCMOS low-noise amplifier at 120/140 GHz using an HBT switch
Heredia, F.-Javier (Francisco Javier); Ribó Pal, Miquel; Pradell i Cara, Lluís; Wipf, Selin Tolunay; Göritz, Alexander; Wietstruck, Matthias; Wipf, Christian; Kaynak, Mehmet (2019-10-01)
Article
Accés obertA 120–140 GHz frequency-switchable, very compact low-noise amplifier (LNA) fabricated in a 0.13 µm SiGe:C BiCMOS technology is proposed. A single radio-frequency (RF) switch composed of three parallel hetero junction bipolar ... -
Modelado circuital multimodal de un resonador pasobanda reconfigurable
Contreras Lizarraga, Adrián Arturo; Ribó, Miquel; Pradell i Cara, Lluís (2010)
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Accés obertIn this work, we present a simple uniplanar bandpass resonator that can be used for the development of reconfigurable uniplanar filters. The multimodal behaviour of the coplanar waveguide is taken into account for the ... -
Modelado físico de transistores MESFET y HEMT
Lázaro, A; Pradell i Cara, Lluís; Torres Torres, Francisco (1994)
Text en actes de congrés
Accés obertModels are developed for the de I-V curves and microwave small-signal parameters of the GaAs MESFET and HEMT. In the first step, the concept of a local small-signal equivalent circuit is introduced. In the second step, a ... -
Modelo de transistores MESFET en régimen no lineal
Corbella Sanahuja, Ignasi; Legido, Jm; Pradell i Cara, Lluís (1989)
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Modelos físicos y técnicas de medida de ruido de transistores MESFETS y HEMT a frecuencias de microondas
Pradell i Cara, Lluís; Purroy, Francesc; O'Callaghan Castellà, Juan Manuel (1996)
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Modulador BPSK a 60 GHz en reflexión en guía de onda
Pradell i Cara, Lluís (Universidad de Málaga, 1992)
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Accés obert