Now showing items 1-20 of 137

  • 100 GHz MST retina for real time near field imaging 

    Garg, Vaibhav (Universitat Politècnica de Catalunya, 2012-06-26)
    Master thesis
    Open Access
    [ANGLÈS] For an imaging system, a good compromise is needed between the resolution of the image and the penetration ability of the electromagnetic wave. In order to obtain a good resolution, a high frequency system is ...
  • 100 K uncooled GaAs mesfet amplifier as paramp replacement 

    de los Reyes, Elías (Institution of Electrical Engineers, 1978-06)
    Article
    Open Access
    The characterisation, design and realisation of a low noise GaAs m.e.s.f.e.t. amplifier to replace a narrow band parametric amplifier at 1.7 GHz is described. Special measurement and analytical techniques are necessary ...
  • Active microwave imaging of inhomogeneous bodies 

    PICHOT DU MEZERAY, Christian; Jofre Roca, Lluís; Peronnet, Guy; Bolomey, Jean Charles (1986-04-01)
    Article
    Open Access
    A numerical method and experimental technique for microwave imaging of inhomogenous bodies is presented. This method is based on the interpretation of the diffraction phenomena and leads to tomographic reconstruction of ...
  • 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
    Restricted access - publisher's policy
    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 ...
  • 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.
  • A General approach for the calculation of intermodulation distortion in cavities with superconducting endplates 

    Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Menéndez, O; O'Callaghan Castellà, Juan Manuel (2003-01)
    Article
    Open Access
    We report on a general procedure to calculate intermodulation distortion in cavities with superconducting endplates that is applicable to the dielectric-loaded cavities currently used for measurement of surface resistance ...
  • A general approach for the calculation of intermodulation distortion in cavities with superconducting endplates 

    Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Menéndez Nadal, Óscar; O'Callaghan Castellà, Juan Manuel (AMER INST PHYSICS, 2003-01-31)
    Article
    Open Access
    We report on a general procedure to calculate intermodulation distortion in cavities with superconducting endplates that is applicable to the dielectric-loaded cavities currently used for measurement of surface resistance ...
  • A high dynamic-range RF programmable-gain front end for G.hn RF-Coax in 65-nm CMOS 

    Trulls Fortuny, Xavier; Mateo Peña, Diego; Bofill, Adrià (IEEE Microwave Theory and Techniques Society, 2012-10)
    Article
    Restricted access - publisher's policy
    A high-dynamic-range programmable-gain inductorless RF front end suitable for the RF-coax bandplan of the G.hn recommendation is presented. A double-input RF programmable gain amplifier (DI-RFPGA) with switchable capacitive ...
  • Algoritmos de tomografía de microondas para objetos de alto contraste 

    Broquetas Ibars, Antoni; Jofre Roca, Lluís (Universidad Politécnica de Madrid (UPM), 1988)
    Conference report
    Open Access
    Conventional first order algorithms used in microwave tomography often fail to reconstruct biological bodies due to their high contrast in permittivity. The paper presents several methods to improve the applicability of ...
  • Algunos aspectos del secado de azulejos cerámicos por microondas 

    Bará Temes, Francisco Javier (1981)
    Conference report
    Open Access
    The results of tests performed on the drying of unfired tiles by the action of microwaves are presented. These results show that a reduction of more than 5% humidity can be achieved in less than 5 minutes in a well designed ...
  • A method for characterizing coplanar waveguide-to-microstrip transitions, and its application to the measurement of microstrip devices with coplanar microprobes 

    Maya Sánchez, Mª del Carmen; Lázaro Guillén, Antoni; Pradell i Cara, Lluís; Paco, D. de (JOHN WILEY & SONS INC, 2003-12-31)
    Article
    Open Access
    This paper presents a method for characterizing coplanar waveguide-to-microstrip (CPW-M) transitions by using on-wafer coplanar (CPW) microprobes. It is based on extracting the transmission matrix of the CPW-M transition ...
  • Análisis de elementos pasivos de microondas mediante el método de los elementos finitos 

    Nuño Fernández, Luis; Ferrando Bataller, Miquel (1991)
    Conference report
    Open Access
    The analysis of arbitrarily-shaped waveguides has been carried out by the Finite Element Method, using two types of elements: triangles with 3 degrees of freedom and triangles with four nodes and 10 degrees of freedom (4 ...
  • Analisis de errores en la teoría de transiciones en líneas de transmisión 

    Bará Temes, Francisco Javier (1980)
    Conference report
    Open Access
    The analysis of transmission line tapers is approached through an integral equation formulation (equivalent to a series solution for propagation through an inhomogeneous medium given by Bremmer) which can be used to ...
  • 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 ...
  • Application of CAD load-pull techniques in mixer design 

    Velázquez, A.; Lázaro Guillén, Antoni; Pradell i Cara, Lluís; Comerón Tejero, Adolfo (2003-02)
    Article
    Open Access
    This work describes the application of a commercial CAD software to implement load-pull techniques in the design of microwave mixers. This method is used to generate conversion-loss regions when a diode is pumped and ...
  • Automatización y control de un motor a pasos para la sintonización de filtros de microondas 

    Benet Freissinier, Josep (Universitat Politècnica de Catalunya, 2010-12-15)
    Master thesis (pre-Bologna period)
    Open Access
    Català: L'objectiu del projecte és ajustar de forma automàtica la freqüència central de un ressonador de microones a la freqüència que desitgi l'usuari. Per aconseguir-ho, s'introdueix la freqüència desitjada al software ...
  • Banco automatizado para la medida de parámetros S, de ruido y características DC de transistores en oblea 

    Pradell i Cara, Lluís; Purroy, Francesc; Subirats, M.; Ballester, A.; Torres Torres, Francisco; O'Callaghan Castellà, Juan Manuel; Corbella Sanahuja, Ignasi (1994)
    Conference report
    Open Access
    The AMR Group has an automatized bench for the measurement of DC-characteristics, [S] parameters (45 MHz- 40 GHz) and noise parameters (2-26.5 GHz) of microwave on-wafer transistors. The hardware configuration is described, ...
  • Calibration of GNSS-R receivers with PRN signal injection: methodology and validation with the microwave interferometric reflectometer (MIR) 

    Pascual Biosca, Daniel; Onrubia Ibáñez, Raúl; Querol Borràs, Jorge; Hyuk, Park; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Conference report
    Restricted access - publisher's policy
    The demonstration of the feasibility of navigation signals signals for remote sensing has lead to a significant increase of new GNSS-R instruments in the recent years. Despite of the type instrument, the observables are ...
  • Capacitive and resistive RF-MEMS switches 2.5D & 3D Electromagnetic and Circuit modelling 

    Giacomozzi, Flavio; Colpo, S.; Plana, Robert; Llamas Morote, Marco Antonio; Girbau Sala, David; Pausas, Esther; Pradell i Cara, Lluís; Aouba, Stephane; Villneuve, C.; Puyal, Vincent; Pons, Patrick (2009)
    Conference report
    Open Access
    this paper proposes different strategies for the electrical modelling of capacitive and resistive RF-MEMS switches which take into account the dependence of the electrical performance on the mechanical properties and ...
  • Caracterización de transistores de microondas mediante la técnica de calibración TRL 

    Pradell i Cara, Lluís; Artal, Eduardo; Comerón Tejero, Adolfo; Corbella Sanahuja, Ignasi; Sabater, C. (1989)
    Conference report
    Open Access
    In this paper, the design of a Microstrip Test Fixture for TRL calibration is described. Experimental results for S-parameters measurement of a GaAs FET chip in the 3-22 GHz frequency range are presented. Repeatability of ...