• Equivalent circuits of planar filtering antennas fed by apertures 

    Kufa, Martin; Raida, Zbynek; Mateu Mateu, Jordi (2014)
    Texto en actas de congreso
    Acceso restringido por política de la editorial
    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)
    Artículo
    Acceso abierto
    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 ...
  • 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)
    Artículo
    Acceso abierto
    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 (2001-03)
    Artículo
    Acceso abierto
    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 (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-03-31)
    Artículo
    Acceso abierto
    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)
    Artículo
    Acceso abierto
    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 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)
    Artículo
    Acceso abierto
    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 ...
  • 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)
    Texto en actas de congreso
    Acceso abierto
    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 ...
  • Hilbert fractal curves for HTS miniaturized filters 

    Barra Bizinotto, Marilda; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; O'Callaghan Castellà, Juan Manuel (Institute of Electrical and Electronics Engineers, 2004)
    Texto en actas de congreso
    Acceso abierto
    This work presents novel compact High Temperature Superconductor (HTS) microstrip resonators based on Hilbert fractal curves. Their miniaturization performance has been investigated, emphasizing the parameters which allow ...
  • How to extract distributed circuit parameters from the scattering parameters of a transmission line 

    Orloff, Nathan D.; Popovic, Nina; Drisko, Jasper A.; Mateu Mateu, Jordi (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Texto en actas de congreso
    Acceso restringido por política de la editorial
    Distributed circuit parameters parameterize the transmission and reflection off a given transmission line in terms of a distributed resistance, inductance, capacitance, and conductance, which are per-unit-length, ...
  • HTS nonlinearities in microwave disk resonators 

    Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; Shaw, Timothy J.; O'Callaghan Castellà, Juan Manuel (ELSEVIER SCIENCE BV, 2002-08-31)
    Artículo
    Acceso abierto
    This article describes a procedure for the calculation of the intermodulation behavior of the TM010 mode in high temperature superconducting (HTS) disk resonators from a description of the local HTS nonlinearities. Successful ...
  • HTS nonlinearities in microwave disk resonators 

    Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; Shaw, T J; O'Callaghan Castellà, Juan Manuel (2002-08)
    Artículo
    Acceso abierto
    This article describes a procedure for the calculation of the intermodulation behavior of the TM010 mode in high temperature superconducting (HTS) disk resonators from a description of the local HTS nonlinearities. Successful ...
  • Intermodulation distortion in coupled-resonator filters with nonuniformly distributed nonlinear properties - Use in HTS IMD compensation. 

    Mateu Mateu, Jordi; Booth, James C.; Collado Gómez, Juan Carlos; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2007-04-30)
    Artículo
    Acceso abierto
    We present a general procedure for calculating intermodulation distortion in coupled-resonator filters that allows one to predict the performance of a nonlinear filter as a function of the general nodal matrix defining the ...
  • LossyFilters 

    Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Rius Casals, Juan Manuel; O'Callaghan Castellà, Juan Manuel (2013-06-11)
    Programa de ordenador
    Acceso restringido por acuerdo de confidencialidad
    The LossyFilters software package has been written to synthesize filters following various forms of classical (no-loss considered in the synthesis), pre-distortion and prescribed insertion loss synthesis. This software ...
  • Lossy filter synthesis of L-band planar filters using novel software 

    Padilla Díaz, Alberto; Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Rocas Cantenys, Eduard; Ernst, Cristoph; Rius Casals, Juan Manuel; Tamayo Palau, José María; O'Callaghan Castellà, Juan Manuel (2011)
    Texto en actas de congreso
    Acceso restringido por política de la editorial
    Lossy synthesis techniques are used to synthesize high performance filters using resonators with a finite Q. With these techniques a transmission response of a lossless filter with lowest possible roll-off is obtained, ...
  • Measurements and analysis of microwave nonlinearities in ferroelectric thin film transmission lines 

    Mateu Mateu, Jordi; Booth, James C.; Schima, S. A.; Collado Gómez, Juan Carlos; Seron, David; O'Callaghan Castellà, Juan Manuel (Institute of Electrical and Electronics Engineers, 2006)
    Texto en actas de congreso
    Acceso abierto
    This work evaluates the microwave nonlinear properties of ferroelectric BaSrTiO thin films by measuring the frequency response of several coplanar transmission lines and interdigital capacitor structures as a function of ...
  • Mechanical tuning of substrate integrated waveguide filters 

    Mira, Fermin; Mateu Mateu, Jordi; Collado Gómez, Juan Carlos (IEEE Microwave Theory and Techniques Society, 2015-12-01)
    Artículo
    Acceso abierto
    This paper presents a novel approach for tuning substrate integrated waveguide resonators, realized by placing an additional metallized via-hole on the waveguide cavity. The approach presented here can be applied as a ...
  • Miniaturization of superconducting filters using Hilbert fractal curves 

    Barra Bizinotto, Marilda; O'Callaghan Castellà, Juan Manuel; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-09-30)
    Artículo
    Acceso abierto
    This work presents novel compact high-temperature superconductor microstrip resonators and filters based on the Hilbert space-filling fractal curve. Several Hilbert resonator configurations have been assessed by using a ...
  • Modeling superconducting transmission line bends and their impact on nonlinear effects. 

    Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2007-05-31)
    Artículo
    Acceso abierto
    This paper reports on a numerical technique to obtain the current distribution in the annular bent sections of planar layouts. This is used to obtain the linear and nonlinear circuit distributed parameters modeling a ...
  • Nonlinear Analysis of Disk Resonators. Application to Material Characteritzation and Filter Design. 

    Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-03-31)
    Artículo
    Acceso abierto
    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 ...