• Accelerated direct solution of the method-of-moments linear system 

    Heldring, Alexander; Tamayo, J.M.; Úbeda Farré, Eduard; Rius Casals, Juan Manuel (2012-08)
    Artículo
    Acceso restringido por política de la editorial
    This paper addresses the direct (noniterative) solution of the method-of-moments (MoM) linear system, accelerated through block-wise compression of the MoM impedance matrix. Efficient matrix block compression is achieved ...
  • Accelerated direct solution of the MoM linear system using block compression and nested factorization 

    Heldring, Alexander; Rius Casals, Juan Manuel (IEEE, 2011)
    Texto en actas de congreso
    Acceso restringido por política de la editorial
    A comparison is presented between different algorithms for direct (non-iterative) accelerated solution of the Method of Moments. The alternatives are common block LU factorization and Compressed Block Decomposition (CBD), ...
  • Accelerated direct solution of the MoM-VIE for dielectric scatterers 

    Heldring, Alexander; Tamayo Palau, José María; Rius Casals, Juan Manuel; Úbeda Farré, Eduard (2011)
    Texto en actas de congreso
    Acceso abierto
    The Multiscale Compressed Block Decomposition algorithm (MS-CBD), a direct (non-iterative) linear solver, is applied to accelerate the solution of the MoM-VIE formulation for dielectric scatterers. Numerical solutions are ...
  • Accurate numerical modeling of the TARA reflector system 

    Heldring, Alexander; Rius Casals, Juan Manuel; Ligthart, Leo P.; Cardama Aznar, Ángel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2004-07-31)
    Artículo
    Acceso abierto
    The radiation pattern of the large parabolic reflectors of the Transportable Atmospheric RAdar system (TARA), developed at Delft University of Technology, has been accurately simulated. The electric field integral ...
  • Active microwave sensing of highly contrasted dielectric bodies 

    Broquetas Ibars, Antoni; Mallorquí Franquet, Jordi Joan; Rius Casals, Juan Manuel; Jofre Roca, Lluís; Cardama Aznar, Ángel (1993-11)
    Artículo
    Acceso restringido por política de la editorial
    In this work the active tomographic imaging of biological bodies which exhibits a high dielectric contrast is studied. Two approaches based on the Born approximation are presented: a differential reconstruction method which ...
  • A cylindrical system for quasy-real time microwave tomography 

    Jofre Roca, Lluís; Reyes, E De Los; Ferrando Bataller, Miquel; Elias Fusté, Antonio; Romeu Robert, Jordi; Baquero, M; Rius Casals, Juan Manuel (Institute of Electrical and Electronics Engineers (IEEE), 1986)
    Texto en actas de congreso
    Acceso abierto
    A cylindrical system for biomedical microwave tomography is presented. The circular algorithms and some numerical reconstructions are discussed. Finally the experimental set-up is described and some preliminary measurements ...
  • Adapted ACA algorithm with improved efficiency and compression rate 

    Heldring, Alexander; Úbeda Farré, Eduard; Rius Casals, Juan Manuel (2015)
    Texto en actas de congreso
    Acceso abierto
    This contribution proposes an adapted version of the popular Adaptive Cross Approximation algorithm for block wise compression of Method of Moments impedance matrices. The estimation of the matrix block ...
  • 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)
    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 ...
  • 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)
    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 ...
  • Algoritmo iterativo de propagación espectral para el cálculo de RCS en cavidades conductoras 

    Rius Casals, Juan Manuel; Cardama Aznar, Ángel; Jofre Roca, Lluís (1992)
    Texto en actas de congreso
    Acceso abierto
    One of the most difficult problems in the RCS prediction of a complex target is the analysis of the cavities existing at the air inlets and outlets of engines. The geometrical complexity of these structures makes difficult ...
  • Análisis de antenas de reflector mediante procesado gráfico 

    Vall-Llossera Ferran, Mercedes Magdalena; Salazar, C; Rius Casals, Juan Manuel; Cardama Aznar, Ángel (Universidad de Valladolid, 1995)
    Texto en actas de congreso
    Acceso abierto
    The aim of this article is to show a new technique for calculating the Radiation Pattern of arbitrary geometry reflector antennas. We use the Graphical processing technique developed in this group for Radar Cross Section ...
  • Analisis de antenas de reflector mediante procesado grafico 

    Rius Casals, Juan Manuel (1991)
    Texto en actas de congreso
    Acceso abierto
    This paper shows a fast algorithm to calculate first contribution to the pattern radiation of a reflector antenna using the hardware capabilities of a high performance graphic workstation . It allows to design interactively ...
  • Analysis of electrically large concave scatterers with the integral equation mei 

    Rius Casals, Juan Manuel; Carpintero, C Pérez; Cardama Aznar, Ángel; Michalski, Krzysztof (1997-04)
    Artículo
    Acceso restringido por política de la editorial
    The integral equation MEI (IE-MEI) is a new, sparse matrix formulation of the boundary-element method, which is particularly well suited for large convex scatterers. In this Letter we explain why the original implementation ...
  • Analysis of microstrip antennas by multilevel matrix decomposition algorithm 

    Parrón Granados, Josep; Rius Casals, Juan Manuel; Heldring, Alexander; Úbeda Farré, Eduard; Mosig, Juan R (ESA, 1999)
    Texto en actas de congreso
    Acceso abierto
    Integral equation methods (IE) are widely used in conjunction with Method of Moments (MoM) discretization for the numerical analysis of microstrip antennas. However, their application to large antenna arrays is difficult ...
  • Analysis of reflector and horn antennas using multilevel fast multipole algorithm 

    Heldring, Alexander; Rius Casals, Juan Manuel; Parrón Granados, Josep; Cardama Aznar, Ángel; Ligthart, L P (CIMNE, 2000)
    Texto en actas de congreso
    Acceso abierto
    The MultiLevel Fast Multipole Algorithm (MLFMA) has been implemented in a Method of Moments code for arbitrarily shaped metal surfaces discretized in Rao, Wilton and Glisson (RWG) basisfunctions. The accuracy of the ...
  • Antenas 

    Cardama Aznar, Ángel; Jofre Roca, Lluís; Rius Casals, Juan Manuel; Romeu Robert, Jordi; Blanch Boris, Sebastián; Ferrando Bataller, Miguel (Edicions UPC, 2002)
    Libro
    Acceso restringido a los usuarios de la UB, UAB, UPC, UPF, UdG, UdL, URV, UOC, BC, UVic, UJI, URL, UIC
    En este libro se presentan los métodos fundamentales de análisis de antenas con un nivel de detalle que permite comprender sus principios de funcionamiento y conocer los parámetros de diseño que son de interés práctico. ...
  • Aplicación de algortimos gráfico de iluminación global al cálculo de interacción electromagnética entre superficies metálicas 

    Vall-Llossera Ferran, Mercedes Magdalena; Rius Casals, Juan Manuel; Ferrando Bataller, Miquel (Unión Científica Internacional de Radio (URSI), 1990)
    Texto en actas de congreso
    Acceso abierto
  • Application of Multilevel Adaptive Cross Approximation (MLACA) to electromagnetic scattering and radiation problems 

    Tamayo Palau, José María; Heldring, Alexander; Rius Casals, Juan Manuel (2009-09-14)
    Texto en actas de congreso
    Acceso abierto
  • Application of the boundary elements method to 3-d radiation problem 

    Abad, J.; Duffo Ubeda, Núria; Rius Casals, Juan Manuel; Cruellas Ibarz, Juan Carlos (. REED EXHIBITION COMPANIES, 1993)
    Texto en actas de congreso
    Acceso abierto
    In order to analyze the electromagnetic fields generated by perfectly conducting bodies composed by interconnected wires and solid objects, whichever its geometry, the Boundary Element Method is applied. The basic formulation ...
  • Application of the multilevel decomposition algorithm to the frequency analysis of large microstrip antenna arrays 

    Parrón Granados, Josep; Rius Casals, Juan Manuel; Mosig, Juan R. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2002-03-31)
    Artículo
    Acceso abierto
    The application of integral equation methods based in the method of moments discretization to solve large antenna arrays is difficult due to the fact that the computational requirements increase rapidly with the number ...