Ara es mostren els items 1-20 de 223

    • A cylindrical system for quasy-real time microwave tomography 

      Jofre Roca, Lluís; Reyes, E De Los; Ferrando Bataller, Miquel; Elias Fusté, Antoni; Romeu Robert, Jordi; Baquero, M; Rius Casals, Juan Manuel (Institute of Electrical and Electronics Engineers (IEEE), 1986)
      Text en actes de congrés
      Accés obert
      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 ...
    • 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 GPU parallel randomized CUR compression method for the Method of Moments 

      López Menchón, Héctor; Heldring, Alexander; Úbeda Farré, Eduard; Rius Casals, Juan Manuel (2023-06-01)
      Article
      Accés restringit per política de l'editorial
      In this work, we propose a GPU parallel implementation of the randomized CUR (or Pseudo Skeleton) Approximation to compress the -matrices of linear systems that arise in the discretization of integral equations modeling ...
    • A microwave invisibility cloak: the design, simulation, and measurement of a simple and effective frequency-selective surface-based mantle cloak 

      Yuste, Pedro; Rius Casals, Juan Manuel; Romeu Robert, Jordi; Blanch Boris, Sebastián; Heldring, Alexander; Úbeda Farré, Eduard (2018-06-26)
      Article
      Accés obert
      In recent years, there has been a growing interest in developing invisibility cloaks that can conceal an object. These techniques are often based either on coating a dielectric or conducting object with a homogeneous ...
    • A model for photocurrent generation in photoconductive antennas 

      López Menchón, Héctor; Revuelta Martinez, Sergio; Santos Blanco, M. Concepción; Romeu Robert, Jordi; Rius Casals, Juan Manuel (2019)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The laser-induced current carrier generation and transport under large biasing voltages in photoconductive materials located in electrode gap region of photoconductive antennas is a complex process involving many different ...
    • A Monte Carlo method for solving the electromagnetic scattering problem in dielectric bodies with massive parallelization 

      López Menchón, Héctor; Rius Casals, Juan Manuel; Úbeda Farré, Eduard; Heldring, Alexander (Unión Científica Internacional de Radio (URSI), 2021)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this work, we develop a novel Monte Carlo method for solving the electromagnetic scattering problem. The method is based on a formal representation of the solution as a modified Born series whose coefficients are found ...
    • A parallel Monte Carlo method for solving electromagnetic scattering in clusters of dielectric objects 

      López Menchón, Héctor; Úbeda Farré, Eduard; Heldring, Alexander; Rius Casals, Juan Manuel (Elsevier, 2022-08-15)
      Article
      Accés restringit per política de l'editorial
      In this work, we develop a novel Monte Carlo method for solving the electromagnetic scattering problem for clusters of photonic particles. The method is based on a formal solution of the scattering problem as a modified ...
    • A recursive acceleration technique for static potential Green's functions of a rectangular cavity combining image and modal series 

      Tamayo Palau, José María; López-Peña, Sergio; Mattes, Michael; Heldring, Alexander; Rius Casals, Juan Manuel; Mosig, Juan Ramón (2011-03)
      Article
      Accés restringit per política de l'editorial
      A hybrid acceleration algorithm for the computation of the static potential Green’s functions of a rectangular cavity is proposed. Similarly to Ewald’s method, it combines the series expansions in terms of images and modes. ...
    • A remote laboratory to promote the interaction between university and secondary education 

      Casany Guerrero, María José; Cabrera-Bean, Margarita; Bragós Bardia, Ramon; Pérez, Marimar; Sánchez Terrones, Benjamín; Guasch Petit, Antonio; Garófano, F.; Gomis Bellmunt, Oriol; Rius Casals, Juan Manuel (Universidad Politécnica de Madrid (UPM), 2010)
      Text en actes de congrés
      Accés obert
      iLabRS is a remote laboratory developed in Telecom BCN, the Telecom and Electronics Engineering School of the UPC with the key participation of a Secondary Education Technology teacher. Students and teachers can access ...
    • A simple and effective microwave invisibility cloak based on frequency selective surfaces 

      Yuste, Pedro; Rius Casals, Juan Manuel; Romeu Robert, Jordi; Blanch Boris, Sebastián; Heldring, Alexander; Úbeda Farré, Eduard (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Comunicació de congrés
      Accés obert
      This paper presents the design, simulation, manufacturing and testing of a simple invisibility cloak based on a frequency selective surface (FSS). The work is focused on cloaking an electrically thin dielectric cylinder ...
    • Accelerated direct solution of the method-of-moments linear system 

      Heldring, Alexander; Tamayo, J.M.; Úbeda Farré, Eduard; Rius Casals, Juan Manuel (2012-08)
      Article
      Accés restringit per política de l'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)
      Text en actes de congrés
      Accés restringit per política de l'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)
      Text en actes de congrés
      Accés obert
      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 ...
    • Acceleration of Born series by change of variables 

      López Menchón, Héctor; Rius Casals, Juan Manuel; Heldring, Alexander; Úbeda Farré, Eduard (2021-09)
      Article
      Accés obert
      In this work, we propose a method to enhance the convergence of the Born series. The Born series is widely used in scattering theory, but its convergence is only guaranteed under certain restrictive conditions which limit ...
    • 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)
      Article
      Accés obert
      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 ...
    • Accurate, grid-robust and versatile combined-field discretization for the electromagnetic scattering analysis of perfectly conducting targets 

      Úbeda Farré, Eduard; Sekulic, Ivan; Rius Casals, Juan Manuel; Heldring, Alexander (2020-04-15)
      Article
      Accés obert
      Recent implementations of the Electric-Field Integral Equation (EFIE) for the electromagnetic scattering analysis of perfectly conducting targets rely on the electric current expansion with the monopolar-RWG basis functions, ...
    • 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)
      Article
      Accés restringit per política de l'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 ...
    • Adapted ACA algorithm with improved efficiency and compression rate 

      Heldring, Alexander; Úbeda Farré, Eduard; Rius Casals, Juan Manuel (2015)
      Text en actes de congrés
      Accés obert
      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 ...
    • Algoritmo iterativo de propagación espectral para el cálculo de RCS en cavidades conductoras 

      Rius Casals, Juan Manuel; Cardama Aznar, Ángel; Jofre Roca, Lluís (1992)
      Text en actes de congrés
      Accés obert
      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 ...
    • Analisis de antenas de reflector mediante procesado grafico 

      Rius Casals, Juan Manuel (1991)
      Text en actes de congrés
      Accés obert
      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 ...