Exploració per tema "Microwaves"

Ara es mostren els items 1-20 de 162

    • 100 GHz MST retina for real time near field imaging 

      Garg, Vaibhav (Universitat Politècnica de Catalunya, 2012-06-26)
      Projecte Final de Màster Oficial
      Accés obert
      [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
      Accés obert
      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 ...

    • 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
      Accés obert
      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, O; O'Callaghan Castellà, Juan Manuel (2003-01)
      Article
      Accés obert
      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
      Accés restringit per política de l'editorial
      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 ...

    • 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
      Accés obert
      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 ...

    • Active microwave imaging of inhomogeneous bodies 

      PICHOT DU MEZERAY, Christian; Jofre Roca, Lluís; Peronnet, Guy; Bolomey, Jean Charles (1986-04-01)
      Article
      Accés obert
      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
      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 ...

    • 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)
      Text en actes de congrés
      Accés obert
      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.

    • Algoritmos de tomografía de microondas para objetos de alto contraste 

      Broquetas Ibars, Antoni; Jofre Roca, Lluís (Universidad Politécnica de Madrid (UPM), 1988)
      Text en actes de congrés
      Accés obert
      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)
      Text en actes de congrés
      Accés obert
      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 ...

    • Analisis de errores en la teoría de transiciones en líneas de transmisión 

      Bará Temes, Francisco Javier (1980)
      Text en actes de congrés
      Accés obert
      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 ...

    • Analysis of different methods to derive microwave resonator parameters from experimental data using Python 

      Gallardo, Queralt (Universitat Politècnica de Catalunya, 2020-01)
      Treball Final de Grau
      Accés restringit per acord de confidencialitat
      Realitzat a/amb:   Sincrotró ALBA
      Aquesta tesi es desenvolupa en el marc d'una associació de projectes del consorci entre ALBA Synchrotron Light Source (ALBA), el Conseil Européen pour la Recherche Nucléaire (CERN), l'Institut de Ciència de Materials de ...

    • Análisis de elementos pasivos de microondas mediante el método de los elementos finitos 

      Nuño Fernández, Luis; Ferrando Bataller, Miquel (1991)
      Text en actes de congrés
      Accés obert
      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 ...

    • 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)
      Text en actes de congrés
      Accés obert
      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
      Accés obert
      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)
      Projecte/Treball Final de Carrera
      Accés obert
      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)
      Text en actes de congrés
      Accés obert
      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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      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)
      Text en actes de congrés
      Accés obert
      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 ...