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Développement de méthodes de synthèse pour la conception de filtres hyperfréquences compacts et optimisés en pertes

Abstract : For satellite communication systems, high performance filters are needed in order to reject unwanted signals in many parts of the communication chain. High quality factor (Q) technologies can meet this requirement, but they often lead to bulky devices. On the other hand, compact technologies are generally low Q and suffer from a degradation of electrical performances in terms of insertion loss, selectivity and flatness. To meet a growing demand concerning size reduction, it is essential to develop compact microwave filters with improved electrical performances.For a receive filter, the challenge is to design a compact bandpass filter with a flat response in the passband and a sharp transition in the passband edges. The insertion loss is not crucial and it can be compensated by the amplifier, leaving a room to the design of a lossy filter. Such a filter accepts additional losses, which can be distributed in the network in order to provide a flat transmission in the passband and a sharp selectivity.In this thesis, new synthesis methods for filtering devices have been studied and developed to improve performances while maintaining a small footprint. These methods have been validated for the design of filters for a receiver in payload satellites as part of collaboration between the Xlim laboratory, the France National Space Centre and Thales Alenia Space.
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  • HAL Id : tel-01126835, version 1

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Ahmed Basti. Développement de méthodes de synthèse pour la conception de filtres hyperfréquences compacts et optimisés en pertes. Electronique. Université de Limoges, 2014. Français. ⟨NNT : 2014LIMO0023⟩. ⟨tel-01126835⟩

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