Comunicaciones y ponencias de congresos DIEC - IEKS Biltzarretako komunikazioak eta txostenak

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Browsing Comunicaciones y ponencias de congresos DIEC - IEKS Biltzarretako komunikazioak eta txostenak by Author "Álvarez Botero, Germán Andrés"

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    PublicationOpen Access
    Integración de múltiples stubs en filtros de saltos de impedancias de alta selectividad
    (URSI, 2023) Gómez Laso, Miguel Ángel; Sami, Abdul; Lopetegui Beregaña, José María; Martín Iglesias, Petronilo; Álvarez Botero, Germán Andrés; Pons Abenza, Alejandro; Arregui Padilla, Iván; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren; Institute of Smart Cities - ISC; Ingeniería Eléctrica, Electrónica y de Comunicación
    Rectangular waveguide commensurate-line stepped-impedance bandpass filters have been shown to have an increased fabrication robustness using conventional CNC milling. In this paper, their frequency response is improved by adding multiple transmission zeros at fully-controlled positions around the passband. The technique starts with the design of the filter without transmission zeros and only requires that one of the filter sections is slightly redesigned, while the rest keep unaltered, when lambda_g/¿¿ and 3*lambda_g/¿¿ stubs are included in the section to increase the overall filter selectivity around the passband. The design example is a 7th-order Chebyshev bandpass filter in Ku-band.
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    PublicationOpen Access
    Temperature measurements on overhead lines using fiber Bragg grating sensors
    (IEEE, 2017) Barón, F.; Amortegui, F. J.; Daniel, P.; Varón, M.; Álvarez Botero, Germán Andrés; Ingeniería Eléctrica, Electrónica y de Comunicación; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren
    This paper shows the results of temperature measurements on an overhead power transmission line segment under controlled conditions using Fiber Bragg Grating (FBG) sensors. An optical fiber with three FBG sensors enclosed in copper was characterized in temperature and then attached along an overhead transmission line to perform the measurements. It was found that variations due to wind and environment temperature can be as high as 30°C and that those variations increase as current and conductor temperature increases and sometimes exceeding the maximum allowable.