Solutions innovantes pour des filtres de fréquences volumiques et semi-volumiques performants, en céramique, silice fondue et thermoplastique COC/COP... : nouvelles alternatives pour les futurs programmes de satellite multimédia

Abstract : The emergence of satellite high-speed internet for the coverage of rural zones is accompanied by numerous technological constraints. The current trend is to use higher frequency bands to release the satellite capacity for users. The increasing frequency requires new considerations especially for filtering needs which become notably strict in terms of performance and integration in small integrated circuits. This work introduces filtering solutions based on high quality factor Substrate Integrated Waveguides (SIW) using a novel 3D transition for a better integration in widely planar Hybrid ICs.The first chapter introduces the study’s context and the different elements justifying the use of the SIW technology.In fact, these structures profit from both the good quality factors of TE-modes propagating in the substrate and the easy fabrication process and integration of planar circuits. However, to increase the SIW quality factor, the substrate’s height should be increased which induces interconnection limitations such as long bond wires with high parasitic effects and large microstrip access lines with discontinuity problems and the propagation of parasitic modes. The adopted approach consists in imagining 3D shapes providing both mode and thickness matching between a microstrip line etched on a thin substrate and a high substrate SIW.The second chapter introduces the different manufacturing processes used for the substrate’s shaping and metallization. Three substrates are considered: Alumina, fused Silica and Cyclo Olefin Polymer COC. Alumina is widely used in space applications and has a well-mastered process. For equivalent dielectric losses, fused silica has a lower permittivity for bigger structures with less manufacturing tolerance sensitivity. Both Alumina and fused silica substrates are shaped using a laser ablation. The reachable substrate’s height using this machining method is relatively low. The polymer solution (COP) is elaborated using a molding process allowing higher substrates heights.The last chapter outlines the design steps of the different solutions and the measurement results of the first prototypes. These results are on the whole encouraging but require further development.
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Submitted on : Tuesday, July 23, 2019 - 4:43:08 PM
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Sarra Abedrrabba. Solutions innovantes pour des filtres de fréquences volumiques et semi-volumiques performants, en céramique, silice fondue et thermoplastique COC/COP... : nouvelles alternatives pour les futurs programmes de satellite multimédia. Autre. Université de Bretagne occidentale - Brest, 2017. Français. ⟨NNT : 2017BRES0126⟩. ⟨tel-02191858⟩

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