Electromechanical band-pass filters
AssigneeSociete Anonyme de Telecommunications
InventorsPhilippe Marie Allemandou, Didier Marcel Beaudet
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Abstract
A band-pass electromechanical filter, comprising an input electromechanical transducer, an output electromechanical transducer and a mechanical filter disposed therebetween, said filter having, alternately disposed, p resonators and (p - 1) coupling pins, resonating all in the longitudinal mode, wherein the coupling pins have identical diameters and lengths varied according to their respective position within said mechanical filter, said length being maximum in the middle of the filter and progressively decreasing towards the ends thereof.
Claims3
A band-pass electromechanical filter, comprising an input electromechanical transducer, an output electromechanical transducer and a mechanical filter disposed therebetween, said filter having p resonators and (p-1) coupling pins, resonating all in the longitudinal mode, each coupling pin connecting two adjacent resonators, wherein the coupling pins have identical diameters and lengths varied according to their respective position within said mechanical filter, the length value being minimum at the end coupling pins and progressively increasing to a maximum at the half-way coupling pins.
Dependencies are inferred from the claim text.