Enviaments recents

  • Self-similar current distribution on fractal Sierpinski antenna verified with infrared thermograms 

    González Arbesú, José María; Puente Baliarda, Carles; Romeu Robert, Jordi; Aguasca Solé, Alberto (Institute of Electrical and Electronics Engineers (IEEE), 1999)
    Text en actes de congrés
    Accés obert
    Experimental verification of the fractal Sierpinski antenna surface current distribution is presented. Measured data from an infrared camera agree with numerical data showing a self-similar behavior in the current density ...
  • A lateral modes model for BAW resonators 

    Collado Gómez, Juan Carlos; Rocas Cantenys, Eduard; Verdú, Jordi; Mateu Mateu, Jordi; Hueltes Escobar, Alberto; Aigner, Robert (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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    Accés restringit per política de l'editorial
    An equivalent circuit model to predict lateral modes occurring in real BAW resonators is proposed. The circuit model has been validated with FEM simulations of FBAR resonators and also with measurements of SMR resonators. ...
  • Constant-gain envelope tracking in a UHF outphasing transmitter based on continuousmode class-E GaN HEMT PAs 

    Ruiz Lavin, Maria de las Nieves; Benito, Adán L.; Pérez Cisneros, J. R.; Gilabert Pinal, Pere Lluís; Montoro López, Gabriel; García, J. A. (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    A UHF outphasing transmitter, based on continuous-mode class-E power amplifiers (PAs) and implementing a constant-gain envelope tracking (ET) strategy, is presented in this paper. Drain terminating and biasing networks are ...
  • Novel formulation of coefficients of low-pass prototype filter for the design of fourelement planar filtering antenna array 

    Kufa, Martin; Raida, Zbynek; Mateu Mateu, Jordi (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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    Accés restringit per política de l'editorial
    The paper is focused on a formulation of a new coefficient of the low-pass prototype filter for the design of a four-element filtering antenna array. Due to the new gicoefficients, we can comfortably and easily control a ...
  • Sistema en banda X para la reconstrucción de imágenes 

    Jofre Roca, Lluís; Ferrando Bataller, Miquel; de los Reyes, Elías; Berenguer Sau, Jordi; Sorolla, M. (1984)
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    This paper describes the theoretical study and experimental set-up for a quasi-real-time active microwave imaging system in band- X. The main contributions are related to the spectral algoritms for the reconstruction ...
  • Multiplicador de frecuencias PLL con detector de fase armónico 

    Berenguer Sau, Jordi; Comerón Tejero, Adolfo (Unión Científica Internacional de Radio (URSI), 1986)
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    An indirect synthesis frequency multiplier at microwave frequencies is presented. A microstrip balanced mixer implemented with a 90 hybrid is used as phase detector, to compare directly phases of signals at 9 and 27 GHz. ...
  • Digital predistortion of envelope tracking amplifiers driven by slew-rate limited envelopes 

    Montoro López, Gabriel; Gilabert Pinal, Pere Lluís; Berenguer Sau, Jordi; Bertran Albertí, Eduardo (IEEE Microwave Theory and Techniques Society, 2011)
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    Accés restringit per política de l'editorial
    This paper presents a new Digital Predistorter (DPD) to compensate for nonlinear distortion that arises in Envelope Tracking (ET) Power Amplifiers (PAs) driven by slew-rate limited versions of the real signal's envelope. ...
  • PLL de microondas con tiempo de adquisición reducido 

    Berenguer Sau, Jordi; Artal, E.; Corbella Sanahuja, Ignasi; Comerón Tejero, Adolfo (1986)
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    The behaviour of a PLL where the VCO is injection-locked to the reference frequency is studied. It is experimentally shown that the phase acquisition time can be reduced relative to the non-injection locked VCO situation. ...
  • Simulation studies of optimal decentralized load-frequency regulators 

    Bertran Albertí, Eduardo; Herranz, J.; Munilla, I. (International Federation of Automatic Control (IFAC), 1986)
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    On appliying the theory of the Optimal Decentralized Regulator (ODR) to the control of an Electric Power System (EPS), due attention has not been paid to some aspects such as the importance of the design model structure, ...
  • On the use of state-feedback in the design of elementary switching regulators 

    Bertran Albertí, Eduardo; Martínez Barrios, Luis; Poveda López, Alberto (Institute of Electrical and Electronics Engineers (IEEE), 1987)
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    Accés obert
    The dc-to-dc buck switching converter is modelled by means of the State-Space Averaging Method and techniques of Modern Control Theory are applied to obtain a class of state-feedback control laws. Three different strategies ...

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