Now showing items 21-40 of 102

    • 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)
      Conference lecture
      Restricted access - publisher's policy
      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 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
      Open Access
      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 nonlinear characterization and modeling of a BAW duplexer 

      Collado Gómez, Juan Carlos; Mateu Mateu, Jordi (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Conference lecture
      Restricted access - publisher's policy
      This paper performs a comprehensive nonlinear modeling of a Bulk Acoustic Wave (BAW) duplexer operating at the band 7 of the LTE wireless communication standard. The modeling starts by an accurate characterization of the ...
    • 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
      Open Access
      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)
      Conference report
      Open Access
      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 ...
    • Doppler based radars 

      Berenguer Sau, Jordi; Mateu Mateu, Jordi (Universitat Politècnica de Catalunya, 2016-10)
      Lecture notes
      Open Access
    • EGPWS 

      Berenguer Sau, Jordi; Mateu Mateu, Jordi (Universitat Politècnica de Catalunya, 2016-10)
      Lecture notes
      Open Access
    • 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
      Restricted access - publisher's policy
      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 ...
    • Equivalent circuits of planar filtering antennas fed by apertures 

      Kufa, Martin; Raida, Zbynek; Mateu Mateu, Jordi (2014)
      Conference report
      Restricted access - publisher's policy
      The paper is focused on a design of a three-element filtering patch antenna array using an equivalent-circuit approach. The array is requested to exhibit a prescribed frequency response of a realized gain which corresponds ...
    • Experiments and model of intermodulation distortion in a rutile resonator with YBCO endplates 

      Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Menéndez Nadal, Óscar; O'Callaghan Castellà, Juan Manuel (KLUWER ACADEMIC/PLENUM PUBL, 2003-10-31)
      Article
      Open Access
      We have derived general equations to calculate intermodulation distortion in resonators with high temperature superconducting (HTS) films which are not restricted to a specific resonator shape and may be used whenever the ...
    • False alarm and probability of detection 

      Berenguer Sau, Jordi; Mateu Mateu, Jordi (Universitat Politècnica de Catalunya, 2016-10)
      Lecture notes
      Open Access
    • Fast procedure for the nonlinear analysis of BAW resonators 

      Perea Robles, Rafael; García Pastor, David; Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Aigner, Robert (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Conference lecture
      Restricted access - publisher's policy
      This work presents the development of a Matlab software tool based on a non-iterative method for the nonlinear analysis of Bulk Acoustic Wave (BAW) resonators and filters. The procedure starts with the admittance matrix ...
    • Fast simulation method of distributed nonlinearities in surface acoustic wave resonators 

      González Rodríguez, Marta; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; González Arbesú, José María; Aigner, Robert; Huebner, Sebatian (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Conference report
      Restricted access - publisher's policy
      Understanding the mechanism of nonlinearity in SAW/BAW devices is growing up in importance because these, even being weak, can cause desensitization of the receivers and limiting their performance. Proper nonlinear 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 ...
    • Filtenna integration achieving ideal chebyshev return losses 

      Hueltes Escobar, Alberto; Verdú Tirado, Jorge Andrés; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; Rocas Cantenys, Eduard; Valenzuela González, José Luis (2014-04-01)
      Article
      Open Access
      This paper demonstrates that it is possible to find an ideal filter response (Chebyshev, Butterworth,..) considering the antenna as the last resonator of a filter under certain circumstances related with the antenna ...
    • 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
      Open Access
      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 ...
    • 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 (2001-03)
      Article
      Open Access
      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 ...
    • General Equations for the Induced Phase Shift in Resonant Electro-Optic Modulators 

      Collado Gómez, Juan Carlos; Menéndez Nadal, Óscar; Santos Blanco, M. Concepción; Mateu Mateu, Jordi; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-02-28)
      Article
      Open Access
      We derive general equations to calculate the electrooptically induced optical phase shift in resonantly enhanced modulators. The equations are useful in designing modulator electrodes with optimal length and optimal mismatch ...
    • Harmonic balance algorithm to model nonlinear effects in HTS filters subject to CDMA signals 

      Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; O'Callaghan Castellà, Juan Manuel (Institute of Electrical and Electronics Engineers, 2003-06)
      Conference report
      Open Access
      We discuss an harmonic balance algorithm to analyze High Temperature Superconducting (HTS) circuits subject to wideband signals, such as the ones used in CDMA wireless systems. Undersampling is used to discretize and ...
    • Harmonic balance algorithms for the nonlinear simulation of HTS devices 

      Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; Parrón Granados, Josep; Pons, J.; O'Callaghan Castellà, Juan Manuel; Rius Casals, Juan Manuel (KLUWER ACADEMIC/PLENUM PUBL, 2001-02-28)
      Article
      Open Access
      This paper describes the application of Harmonic Balance algorithms to predict nonlinear effects in planar High Temperature Superconductors (HTS) microwave circuits. The resulting algorithms are fast and efficient and can ...