Ara es mostren els items 1-20 de 67

  • Absorptive limiter for frequency-selective circuits 

    Collado Gómez, Juan Carlos; Hueltes Escobar, Alberto; Rocas Cantenys, Eduard; Mateu Mateu, Jordi; Booth, James C.; O'Callaghan Castellà, Juan Manuel; Verdú Tirado, Jorge Andrés (2014-06-01)
    Article
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    This letter describes a novel absorptive limiter for frequency-selective circuits. The proposed circuit allows the design of absorptive limiters based on a bi-state phase shifter, which is appropriate for integration into ...
  • A consistent methodology to characterize BAW resonators 

    Rocas Cantenys, Eduard; Collado Gómez, Juan Carlos; Aigner, Robert; Mateu Mateu, Jordi; Hueltes Escobar, Alberto; Booth, James C. (2012)
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    We present a methodology to characterize BAW resonators both linearly and nonlinearly. The procedure uses physical modeling along with measurements that exploit different manifestations of the nonlinear phenomena to ...
  • A general approach for the calculation of intermodulation distortion in cavities with superconducting endplates 

    Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Menéndez Nadal, Óscar; O'Callaghan Castellà, Juan Manuel (AMER INST PHYSICS, 2003-01-31)
    Article
    Accés obert
    We report on a general procedure to calculate intermodulation distortion in cavities with superconducting endplates that is applicable to the dielectric-loaded cavities currently used for measurement of surface resistance ...
  • A General approach for the calculation of intermodulation distortion in cavities with superconducting endplates 

    Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Menéndez, O; O'Callaghan Castellà, Juan Manuel (2003-01)
    Article
    Accés obert
    We report on a general procedure to calculate intermodulation distortion in cavities with superconducting endplates that is applicable to the dielectric-loaded cavities currently used for measurement of surface resistance ...
  • A General Electromagnetic Simulation Tool to Predict the Microwave Nonlinear Response of Planar, Arbitrarily-Shaped HTS Structures 

    Parrón Granados, Josep; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; Rius Casals, Juan Manuel; Duffo Ubeda, Núria; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-03-31)
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    This work describes a simulation tool being developed at UPC to predict the microwave nonlinear behavior of planar superconducting structures with very few restrictions on the geometry of the planar layout. The software ...
  • A general electromagnetic simulation tool to predict the microwave nonlinear response of planar, arbitrarily-shaped HTS structures 

    Parrón Granados, Josep; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; Rius Casals, Juan Manuel; Duffo Ubeda, Núria; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-03-31)
    Article
    Accés obert
    This work describes a simulation tool being developed at UPC to predict the microwave nonlinear behavior of planar superconducting structures with very few restrictions on the geometry of the planar layout. The software ...
  • A Ku band circularly polarized 2×2 microstrip antenna array for remote sensing applications 

    Ferré, Roger; Mira, Fermín; Luzi, Guido; Mateu Mateu, Jordi; Kalialakis, C. (Institute of Electrical and Electronics Engineers (IEEE), 2017)
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    This paper reports the development of a Circularly Polarized (CP) microstrip patch array working at Ku band and in particular between 16.9-17.2GHz for remote sensing applications. The design is based on a sequential ...
  • 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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    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. ...
  • 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)
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    Accés obert
    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 ...
  • Analysis and Simulation of Distributed Nonlinearities in Ferroelectrics and superconductors for Microwave Applications 

    Seron, David; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-03-31)
    Article
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    This paper gives closed-form equations for the intermodulation and third harmonic signals generated in a nonlinear transmission line with distributed quadratic nonlinearities in the conductor and dielectric. Although the ...
  • Analysis and Simulation of the Effects of Distributed Nonlinearities in Microwave Superconducting Devices 

    Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-03-31)
    Article
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    This paper presents a comprehensive study of microwave nonlinearities in superconductors, with an emphasis on intermodulation distortion and third-harmonic generation. It contains the analysis of various resonant and ...
  • Analysis of dielectric-loaded cavities for characterization of the nonlinear properties of high temperature superconductors 

    Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Menéndez Nadal, Óscar; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2003-06-30)
    Article
    Accés obert
    This work describes and compares two alternative methods of analyzing dielectric-loaded cavities for measurement of intermodulation distortion in HTS films. One of them is based on assuming a specific type of HTS nonlinearities ...
  • Compact duplexer with miniaturized dual loop resonator 

    Collado Gómez, Juan Carlos; Pozo Vicente, Javier; Mateu Mateu, Jordi; O'Callaghan Castellà, Juan Manuel (Institute of Electrical and Electronics Engineers, 2005)
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    This work presents a very compact duplexer based on novel miniaturized loaded-close-loop dual resonators. Two different dual resonators are used to establish the two bands, corresponding to the transmitter and the receiver ...
  • Comparison between nonlinear measurements in patterned and unpatterned thin films 

    Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; O'Callaghan Castellà, Juan Manuel (IOP PUBLISHING LTD, 2004-07-31)
    Article
    Accés obert
    This work compares two alternative methods of characterizing the nonlinearities in a 10 × 10 mm2 superconducting thin film. Both methods are based on measuring the intermodulation distortion in high temperature superconducting ...
  • Comparison of lossy filters and predistorted filters using novel software 

    Padilla Díaz, Alberto; Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Ernst, Cristoph; Rius Casals, Juan Manuel; Tamayo Palau, José María; O'Callaghan Castellà, Juan Manuel (IEEE Microwave Theory and Techniques Society, 2010)
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  • Comprehensive circuit model of autolimiting superconductor devices 

    Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Hueltes Escobar, Alberto; O'Callaghan Castellà, Juan Manuel; García Pastor, David; Perea Robles, Rafael; Joshi, N.; Lu, X.; Orloff, Nathan D.; Booth, James C. (2017-06-01)
    Article
    Accés obert
    This paper presents a phenomenological equivalent circuit to model the phenomenon occurring when a section of superconducting transmission line transits from a superconducting state to a normal state. This phenomenon allows ...
  • Comprehensive circuit model of auto-limiting superconductor devices and systems 

    Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Hueltes Escobar, Alberto; O'Callaghan Castellà, Juan Manuel; García Pastor, David; Perea Robles, Rafael; Joshi, N.; Lu, X.; Orloff, Nathan D.; Booth, James C. (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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    This paper presents a phenomenological equivalent circuit to model the phenomenon occurring when a section of superconducting transmission line transits from a superconducting state to a normal state. This phenomenon allows ...
  • Correction to "Nonlinear Analysis of Disk Resonators: Application to Material Characterization and Filter Design 

    Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-12-31)
    Article
    Accés obert
    A procedure for the numerical prediction of the microwave nonlinear behavior (intermodulation products, degradation of quality factors, etc.) of TM010 disk resonators has been developed. The procedure is based on relating ...
  • Detuning and saturation of superconducting devices: formulation and measurements 

    Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; Booth, James C.; O'Callaghan Castellà, Juan Manuel (Institute of Electrical and Electronics Engineers, 2007-06)
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    Saturation and detuning of high temperature superconducting (HTS) resonators and filters may occur due to the inherent nonlinear properties of the superconductor. In HTS transmission lines, these nonlinear properties ...
  • Electro-thermo-mechanical model for bulk acoustic wave resonators 

    Rocas Cantenys, Eduard; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; Orloff, Nathan D.; Booth, James C.; Aigner, Robert (2013-11)
    Article
    Accés restringit per política de l'editorial
    We present the electro-thermo-mechanical constitutive relations, expanded up to the third order, for a BAW resonator. The relations obtained are implemented into a circuit model, which is validated with extensive linear ...