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Ara es mostren els items 86-105 de 146

    • Fet noise-parameter determination using a novel technique based on 50 noise measurements 

      Lázaro Guillén, Antoni; Pradell i Cara, Lluís; O'Callaghan Castellà, Juan Manuel (IEEE, 1999)
      Article
      Accés obert
      A novel method for measuring the four noise parameters of a field-effect transistor (FET) is presented. It is based on the determination of its intrinsic noise matrix elements [C11INT, C22INT, Re(C12 INT), Im(C12INT)] by ...

    • FET noise-parameter determination using a novel technique based on 50 noise measurements 

      Lázaro Guillén, Antoni; Pradell i Cara, Lluís; O'Callaghan Castellà, Juan Manuel (IEEE Microwave Theory and Techniques Society, 1999-03)
      Article
      Accés obert
      A novel method for measuring the four noise parameters of a field-effect transistor (FET) is presented. It is based on the determination of its intrinsic noise matrix elements [CINT 11 , CINT 22 , Re(CINT 12 ), Im(CINT 12 ...

    • Filtro en plano E a 60 GHz 

      Porta, A.; Carrasco, L.M.; de Mingo, J.; Corbella Sanahuja, Ignasi; Pradell i Cara, Lluís (Universidad de Málaga, 1992)
      Text en actes de congrés
      Accés obert

    • Filtro paso-banda con control preciso de frecuencia central y ancho de banda usando interruptores RF MEMS 

      Brito Brito, Zabdiel; Llamas Garro, Ignacio; Perruisseau Carrier, Julien; Pradell i Cara, Lluís; Giacomozzi, Flavio; Colpo, Sabrina (2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper a reconfigurable bandpass filter is presented. The filter is able to switch between two different states with a center frequency tunable range of 24 % in C band. Center frequency and bandwidth are precisely ...

    • Filtro uniplanar multimodal reconfigurable 

      Contreras Lizarraga, Adrián Arturo; Ribó, M.; Pradell i Cara, Lluís (2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A uniplanar filter based on two coplanar-waveguide odd-mode resonators is presented. The resonator feeding point is easily reconfigured using PIN diodes. As a result, the filter features reconfigurable bandwidth. A multimodal ...

    • Filtros para un cabezal de comunicaciones entre vehículos 

      Brito Brito, Zabdiel; Llamas Garro, Ignacio; Navarro Muñoz, Guillem; Perruisseau Carrier, Julien; Pradell i Cara, Lluís (2009)
      Text en actes de congrés
      Accés obert
      In this paper two reconfigurable bandpass filters able to switch between WiFi and UMTS for transmit and receive band standards are presented. The filters are designed in such a way that center frequency and bandwidth sp ...

    • Final exam microwaves 

      O'Callaghan Castellà, Juan Manuel; Corbella Sanahuja, Ignasi; Pradell i Cara, Lluís (Universitat Politècnica de Catalunya, 2020-06-19)
      Examen
      Accés restringit a la comunitat UPC

    • Frequency and bandwidth control of switchable microstrip bandpass filters using RF-MEMS ohmic switches 

      Brito Brito, Zabdiel; Llamas, Ignacio; Pradell i Cara, Lluís; Giacomozzi, Flavio; Colpo, Sabrina (2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper a reconfigurable bandpass filter is designed using ohmic-contact cantilever-type Micro Electro Mechanical Systems (MEMS) switches., Tthe filter can switch between two different states with a center frequency ...

    • Generalized transverse resonance analysis of planar discontinuities considering the edge effect 

      Barlabe Dalmau, Antoni; Comerón Tejero, Adolfo; Pradell i Cara, Lluís (2000-12)
      Article
      Accés obert
      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 ...

    • Generalized transverse resonance analysis of planar discontinuities considering the edge effect 

      Barlabe Dalmau, Antoni; Comerón Tejero, Adolfo; Pradell i Cara, Lluís (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2000-12-31)
      Article
      Accés obert
      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 ...

    • High efficiency reconfigurable class-F power amplifier at 2.4 GHz in CMOS-MEMS technology 

      Gilasgar, Mitra; Barlabe Dalmau, Antoni; Pradell i Cara, Lluís; Mansour, Raafat; Batri-Kaseem, Maher (2015)
      Text en actes de congrés
      Accés restringit per acord de confidencialitat
      A novel reconfigurable CMOS class-F power amplifier is proposed in this paper which can adapt to load variations resulted from the hand effect on a mobile phone. Reconfigurability is achieved by using MEMS switches that ...

    • High-efficiency reconfigurable dual-band class-F power amplifier with harmonic control network using MEMS 

      Gilasgar, Mitra; Barlabe Dalmau, Antoni; Pradell i Cara, Lluís (2020-07-01)
      Article
      Accés obert
      This letter presents a novel reconfigurable, high-efficiency class-F power amplifier (PA) structure, using a commercial GaN-HEMT, that achieves dual-band configuration not only at the fundamental frequency but also at the ...

    • Highly efficient class-F RF power amplifiers with very low distortion 

      Gilasgar, Mitra; Barlabe Dalmau, Antoni; Pradell i Cara, Lluís (2013-12)
      Article
      Accés restringit per política de l'editorial
      This paper presents a novel class-F power amplifiers for mobile applications in which the need for an extra filtering section is eliminated with a proper harmonic tuning structure. Two class-F power amplifiers are presented ...

    • 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 obert
      An 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 obert
      An 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'editorial
      A 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 obert
      A 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'editorial
      This 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)
      Text en actes de congrés
      Accés obert

    • 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 obert
      The 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 ...