Exploració per tema "Microones"
Ara es mostren els items 1-20 de 183
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100 GHz MST retina for real time near field imaging
(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
(Institution of Electrical Engineers, 1978-06)
Article
Accés obertThe 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 calibration method for fully polarimetric microwave radiometers
(IEEE Press. Institute of Electrical and Electronics Engineers, 2003-03)
Article
Accés obertA technique for absolute end-to-end calibration of a fully polarimetric microwave radiometer is presented. The technique is based on the tripolarimetric calibration technique of Gasiewski and Kunkee, but is extended to ... -
A general approach for the calculation of intermodulation distortion in cavities with superconducting endplates
(AMER INST PHYSICS, 2003-01-31)
Article
Accés obertWe 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
(2003-01)
Article
Accés obertWe 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
(IEEE Microwave Theory and Techniques Society, 2012-10)
Article
Accés restringit per política de l'editorialA 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
(JOHN WILEY & SONS INC, 2003-12-31)
Article
Accés obertThis 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 ... -
A novel tunable multimodal bandpass filter
(2011)
Text en actes de congrés
Accés restringit per política de l'editorialThis paper presents a novel uniplanar tunable bandpass filter. In this filter, each resonator can be reconfigured easily using PIN diodes or MEMS switches. Design equations are derived from a simple circuit model which ... -
Active microwave imaging of inhomogeneous bodies
(1986-04-01)
Article
Accés obertA 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
(1993-11)
Article
Accés restringit per política de l'editorialIn 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
(Unión Científica Internacional de Radio (URSI), 1983)
Text en actes de congrés
Accés obertA 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
(Universidad Politécnica de Madrid (UPM), 1988)
Text en actes de congrés
Accés obertConventional 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
(1981)
Text en actes de congrés
Accés obertThe 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
(1980)
Text en actes de congrés
Accés obertThe 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
(Universitat Politècnica de Catalunya, 2020-01)
Treball Final de Grau
Accés restringit per acord de confidencialitat
Realitzat a/amb: Sincrotró ALBAAquesta 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
(1991)
Text en actes de congrés
Accés obertThe 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
(Unión Científica Internacional de Radio (URSI), 1983)
Text en actes de congrés
Accés obertThe 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 ... -
Aplication of Interferometric Radiometry to Earth Observation
(Universitat Politècnica de Catalunya, 1996-11-22)
Tesi
Accés obertLa tesis contiene en primer lugar un estudio de las técnicas de interferometria radiometrica, con énfasis en las causas de error y su impacto en las características del sensor. A continuación se proponen y comparan varias ... -
Automatización y control de un motor a pasos para la sintonización de filtros de microondas
(Universitat Politècnica de Catalunya, 2010-12-15)
Projecte/Treball Final de Carrera
Accés obertCatalà: 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
(1994)
Text en actes de congrés
Accés obertThe 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, ...