https://dspace.univ-ouargla.dz/jspui/handle/123456789/317 2026-04-04T14:38:25Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/6806 Titre: Study and Design of Tunable Filters Based on Planar Technology Auteur(s): Fentiz, Saida Résumé: The objective of this thesis is the design and synthesis of tunable bandpass filter at microwave frequencies using planar patch resonators. The characteristics of the designed filter, such as center frequency, bandwidth, and/or selectivity, are electronically adjusted by a DC voltage control.A design and synthesis of tunable patch filters is developed and applied to circular filter topologies. The complete simulations combine the results of the 3D electromagnetic (EM) simulation of the filter layout with the results of the electrical stimulation of the tuning devices was presented. This allows the correct model of the tuning effect and the definition of the tuning possibilities and limits. The minimum dimensions are greater than 0.5 mm, ensuring a low cost fabrication process. The filter is a tunable triple-mode patch filter using a circular resonator with four slots, across which the varactor diodes are connected Description: Université Kasdi Merbah Ouargla 2014-01-01T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/6489 Titre: Conception, Développement et Optimisation de Filtres Passe-bandes Ultra Large Bande pour les Systèmes de Communication Sans Fil Auteur(s): LOUAZENE, Hassiba Résumé: Dans le but d' atteindre les caractéristiques suivantes: faible perte d' insertion bande atténuée et grande compacité dans les systèmes de communication sans fil ultra large bande une étude comparative est menée entre trois filtres passe bande ; deux avec DGS et un sans DGS Description: Electronics 2014-01-01T00:00:00Z