Now showing items 1-20 of 23

  • Admitancia de entrada de una guía rectangular rellena de dieléctrico 

    Jofre Roca, Lluís; Ferrando Bataller, Miquel; Cardama Aznar, Ángel (Unión Científica Internacional de Radio (URSI), 1983)
    Conference report
    Open Access
    A variational formulation, based in a plane wave angular decomposition, is developped for the admitance of a rectangular dielectric-filled waveguide, radiating in a half space.
  • Algoritmo iterativo de propagación espectral para el cálculo de RCS en cavidades conductoras 

    Rius Casals, Juan Manuel; Cardama Aznar, Ángel; Jofre Roca, Lluís (1992)
    Conference report
    Open Access
    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 ...
  • Algoritmos para el cálculo de los campos lejanos radiados por antenas, a partir de medidas en campo próximo 

    Jofre Roca, Lluís; Cardama Aznar, Ángel (1980)
    Conference report
    Open Access
    We present the principles of operation of near field antenna ranges and general expressions for the calculation of the far field, from measurements on plane surfaces, focusing on the limitations of the different aproaches. ...
  • Análisis de antenas parabólicas 

    Jofre Roca, Lluís; Cardama Aznar, Ángel (1981)
    Conference report
    Open Access
    This paper describes a set of procedures for computing secondary patterns of parabolic-reflector antennas. Once the primary feed radiation pattern is defined, aperture-plane fields are computed for a grid of points using ...
  • Análisis de guías parcialmente rellenas de dieléctrico mediante el método de los elementos finitos 

    Ferrando Bataller, Miquel; Cruellas Ibarz, Juan Carlos; Cardama Aznar, Ángel; Jofre Roca, Lluís (Unión Científica Internacional de Radio (URSI), 1983)
    Conference report
    Open Access
    The finite element's method is aplied to the study of inhomogenous waveguides of arbitrary cross-section. The fields in the guide are - expanded in a series of bidimensional functions, obtaining a variational expression ...
  • Antenas de ranura en el plano de masa de una línea stripline 

    Ferrando Bataller, Miquel; Cardama Aznar, Ángel (1980)
    Conference report
    Open Access
    A theoretical analysis of slot antennas excited by stripline is presented, with calculation of impedance and resonance frequency for different positions of the slot. Mutual effects are taken into account and results for ...
  • Antenas para radio y TV. Principios de funcionamiento y características técnicas 

    Cardama Aznar, Ángel; Jofre Roca, Lluís (1980-09)
    Article
    Open Access
    Existe una gran variedad de antenas utilizadas satisfactoriamente como transmisoras y receptoras y aunque en cada banda de frecuencias existe una gran especialización de los tipos empleados, todas ellas operan sobre ...
  • Antenas: ¿ha cambiado algo en ellas en este siglo? 

    Cardama Aznar, Ángel (1998)
    Conference report
    Open Access
  • Caracterisation d'un systeme experimental pour la mesure a champ proche 

    Jofre Roca, Lluís; Cardama Aznar, Ángel (1981)
    Conference report
    Open Access
    Pendant les dernières années on a suscité un fort intérêt pour la mesure de la distribution des champs dans la zone proche des ouvertures, ainsi que pour son utilisation dans l'obtention des caractéristiques de rayonnement ...
  • Caracterización electromagnética de materiales RAM mediante medidas en espacio libre 

    Blanch Boris, Sebastián; Cardama Aznar, Ángel; Jofre Roca, Lluís (1991)
    Conference report
    Open Access
    A free-space measurement system in the 2-JBGHz frequency range is used to measure the reflection and transmission coefficients of planar samples. The complex electric permittivity and the magnetic permeability are calculated ...
  • Cálculo de radiación en 3 dimensiones mediante el método de los elementos de contorno 

    Duffo Ubeda, Núria; Rius Casals, Juan Manuel; Cardama Aznar, Ángel (1992)
    Conference report
    Open Access
    In order to analize the electromagnetic fields generated by perfectly conducting bodies whichever it is its geometry, the Boundary Element Method is applied. The basic formulation and associated items (integral equations ...
  • Condiciones de existencia de modos de orden superior en estructuras planares 

    Cardama Aznar, Ángel (1980)
    Conference report
    Open Access
    Conditions for existence of higher-order modes of the reduced wave equation V2 u + Au = 0 on semi - infinite domains subjected to different boundary conditions are presented and applied to the slot line. Bounds for the ...
  • Diagnóstico de antenas a partir de medidas en campo próximo cilíndrico 

    Jofre Roca, Lluís; Cardama Aznar, Ángel; Ferrando Bataller, Miquel (Universidad Politécnica de Madrid (UPM), 1988)
    Conference report
    Open Access
    The purpose of this study is to show the antenna imaging capabilities of a near field measurement system. From the antenna near field data, the aperture field is reconstructed in the first instance, and then the source ...
  • Impedancia de entrada de las antenas impresas circulares 

    Ferrando Bataller, Miquel; Cardama Aznar, Ángel (Universidad de Cantabria, 1982)
    Conference report
    Open Access
  • Medida de antenas en campo próximo sobre una superficie cilíndrica 

    Jofre Roca, Lluís; Cardama Aznar, Ángel; Ferrando Bataller, Miquel (Unión Científica Internacional de Radio (URSI), 1983)
    Conference report
    Open Access
    An efficient formulation for far-field reconstruction from near-field measurements on a cylinder is presented. An experimental setup is devoted to the study of the influence on the reconstruction of the different geometric ...
  • Medida de antenas en un sistema de campo próximo semicompacto 

    Cardama Aznar, Ángel; Ferrando Bataller, Miquel; Jofre Roca, Lluís (1987)
    Conference report
    Open Access
    A synthesis method of uniform cylindrical waves of finite extension is presented, based on an optimized linear current distribution, obtained by an iterative method in the espectral domain. Substituting in a cylindrical ...
  • Medida de características de dispositivos fotoemisores para comunicaciones ópticas 

    Cardama Aznar, Ángel; Ferrando Bataller, Miquel (1981)
    Conference report
    Open Access
    Experimental procedures for the measurement of spectral and frequency responses, power and radiation patterns of emitters for optical communications are presented, with a description of the instrumentation developed and ...
  • Medida no destructiva del perfil de índice en fibras ópticas 

    Cardama Aznar, Ángel; Jofre Roca, Lluís (1981)
    Conference report
    Open Access
    Non destructive methods for the measurement of index profiles of optical fibers are presented, with emphasis placed on those based on scattering by incoherent light and the focusing method. Computer programs for calculation ...
  • Medida y optimización de alimentadores primarios para reflectores parabólicos 

    Ferrando Bataller, Miquel; Jofre Roca, Lluís; Cardama Aznar, Ángel (Universidad de Sevilla, 1984)
    Conference report
    Open Access
    We describe in this paper a theoretical and experimental procedure for the caracterization of parabolic antenna feeds. The experimental set-up and the algorithms for the measurement and optimization of these antennas are ...
  • Métodos numéricos de análisis de antenas parabólicas 

    Jofre Roca, Lluís; Ferrando Bataller, Miquel; Cardama Aznar, Ángel (Universidad de Cantabria, 1982)
    Conference report
    Open Access
    An algorithm, based in the Bessel- Jacobi method, is presented wich allows to obtain an approximation for the radiation characteristics of parabolic-reflector antennas from knowledge of the field distribution on the two ...