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  • Sub-nanosecond tuning of microwave resonators fabricated on ruddlesden–popper dielectric thin films 

    Hagerstrom, A. M.; Lu, Xifeng; Dawley, Natalie M.; Mateu Mateu, Jordi (Wiley, 2018-08-01)
    Article
    Open Access
    Voltage-tunable dielectric materials are widely used for microwave-frequency signal processing. Among tunable dielectric thin films, (SrTiO3)nSrO Ruddlesden–Popper (RP) superlattices have exceptionally low loss at high ...

  • Independent digital predistortion parameters estimation using adaptive principal component analysis 

    López Bueno, David; Pham, Thi Quynh Anh; Montoro López, Gabriel; Gilabert Pinal, Pere Lluís (IEEE Microwave Theory and Techniques Society, 2018-01-01)
    Article
    Open Access
    This paper presents an estimation/adaptation method based on the adaptive principal component analysis (APCA) technique to guarantee the identification of the minimum necessary parameters of a digital predistorter. The ...

  • Partial least squares identification of multi look-up table digital predistorters for concurrent dual-band envelope tracking power amplifiers 

    Pham, Thi Quynh Anh; López Bueno, David; Wang, Teng; Montoro López, Gabriel; Gilabert Pinal, Pere Lluís (IEEE Microwave Theory and Techniques Society, 2018-08-02)
    Article
    Open Access
    This paper presents a technique to estimate the coefficients of a multiple-look-up table (LUT) digital predistortion (DPD) architecture based on the partial least-squares (PLS) regression method. The proposed 3-D distributed ...

  • Feed-forward technique to measure the reflection coefficient under CW high-power signals 

    Collado Gómez, Juan Carlos; González Rodríguez, Marta; González Arbesú, José María; Mateu Mateu, Jordi; Verdú Tirado, Jordi; Hueltes Escobar, Alberto (IEEE Microwave Theory and Techniques Society, 2018-10-01)
    Article
    Open Access
    This paper describes a measurement setup to obtain the reflection coefficient response over the frequency of a given device when this is subjected to a single-tone high-power (HP) signal. The proposed system is based on a ...

  • Track detection in railway sidings based on MEMS gyroscope sensors 

    Broquetas Ibars, Antoni; Comerón Tejero, Adolfo; Gelonch Bosch, Antonio José; Fuertes Armengol, José Mª; Castro Fernández, José Antonio; Felip, Damià; López Márquez, Miguel Ángel; Pulido, Jose Antonio (Multidisciplinary Digital Publishing Institute (MDPI), 2012-11-23)
    Article
    Open Access
    The paper presents a two-step technique for real-time track detection in single-track railway sidings using low-cost MEMS gyroscopes. The objective is to reliably know the path the train has taken in a switch, diverted or ...

  • Nonlinear effects of SiO2 layers in bulk acoustic wave resonators 

    Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; García Pastor, David; Perea Robles, Rafael; Hueltes Escobar, Alberto; Kreuzer, Susanne; Aigner, Robert (IEEE Microwave Theory and Techniques Society, 2017-12-29)
    Article
    Open Access
    This paper presents the development of a comprehensive distributed circuit model to account for the existing nonlinear effects in bulk acoustic wave (BAW) resonators. The comprehensiveness of the model and its distributed ...

  • Teaching telecommunication standards: bridging the gap between theory and practice 

    Gelonch Bosch, Antonio José; Marojevic, Vuk; Gómez Miguelez, Ismael (2017-05)
    Article
    Open Access
    Telecommunication standards have become a reliable mechanism to strengthen collaboration between industry and research institutions to accelerate the evolution of communications systems. Standards are needed to enable ...

  • Waveguide filter modeling and simulation using mode-matching, fullwave network analysis and swarm optimization 

    Bouchachi, Islem; Mateu Mateu, Jordi; Lahdi Riabi, Mohamed (2017-02-01)
    Article
    Restricted access - publisher's policy
    The paper presents the synthesis of forth-order waveguide bandpass filter, employing a symmetric configuration and leading to symmetric response with four poles and two transmission zeroes. For this synthesis we aimed to ...

  • A multistate single-connection calibration for microwave microfluidics 

    Orloff, Nathan D.; Ma, Xiao; Little, Charles A. E.; Mateu Mateu, Jordi (IEEE Microwave Theory and Techniques Society, 2017-10-12)
    Article
    Open Access
    With emerging medical, chemical, and biological applications of microwave-microfluidic devices, many researchers desire a fast and accurate calibration that can be achieved in a single connection. However, traditional ...

  • Three-element filtering antenna array designed by the equivalent circuit approach 

    Kufa, Martin; Raida, Zbynek; Mateu Mateu, Jordi (2016-09-01)
    Article
    Open Access
    This paper introduces a design methodology of a third-order three-element patch array that has no filtering parts and yet behaves like a filtering antenna (filtenna). The design approach includes shaping the frequency ...

  • Analysis of the optimum gain of a high-pass l-matching network for rectennas 

    Gasulla Forner, Manuel; Jordana Barnils, José; Robert Sanxis, Francesc Josep; Berenguer Sau, Jordi (MDPI AG, 2017-07-25)
    Article
    Open Access
    Rectennas, which mainly consist of an antenna, matching network, and rectifier, are used to harvest radiofrequency energy in order to power tiny sensor nodes, e.g., the nodes of the Internet of Things. This paper demonstrates ...

  • Tunable substrate integrated waveguide resonators 

    Mira, Fermin; Mateu Mateu, Jordi; Collado Gómez, Juan Carlos (2012-09-01)
    Article
    Open Access
    This paper presents a novel approach for providing SIW tunable resonators by means of placing an additional metalized via-hole on the waveguide cavity. The via-hole contains an open-loop slot on the top metallic wall. The ...

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