Synthèse de filtres hyperfréquences prenant en compte le comportement dispersif des couplages

Ahmad Haidar 1
1 XLIM-SRF - Systèmes RF
XLIM - XLIM : SRF
Abstract : This thesis report deals with the development of a methodology for the design of bandpass filters including dispersive coupling to optimize the selectivity of these filters by generating and controlling the position of additional transmission zeros. A state of the art on the different approaches proposed in the literature for the synthesis of microwave filters with dispersive coupling is first proposed. This analysis is illustrated by several concrete examples, and a structure in particular, comprising a coupling capacitive post, is the starting point of the work. New dispersive coupling elements were then proposed, capable of generating both positive and negative couplings, thus enabling the transmission zeros to be positioned in the upper or lower stopped band. These elements have then been integrated in more complex filtering structures to achieve, for example, on-line structures having several out-of-band transmission zeros or multiband filters with enhanced selectivity. Many of the devices designed have been manufactured and measured. The experimental results are in good agreement with the simulations validating the proposed approach.
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Ahmad Haidar. Synthèse de filtres hyperfréquences prenant en compte le comportement dispersif des couplages. Electronique. Université de Limoges, 2018. Français. ⟨NNT : 2018LIMO0105⟩. ⟨tel-02043564⟩

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