Double mode surface wave resonators

H - Electricity – 03 – H

Patent

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H03H 9/17 (2006.01) H03H 9/25 (2006.01)

Patent

CA 2135983

A double mode surface wave resonator comprises two IDTs (inter-digital transducers), arranged side by side between reflection gratings, on a surface of a piezoelectric substrate to provide for coupling of surface waves therebetween, each IDT having interleaved electrodes extending from a common rail between the two IDTs and from a respective outer rail of the IDT. One or each of the IDTs and its outer rail is divided into two halves for providing a differential signal connection to the resonator. The electrodes of the IDTs can be arranged in spatial synchronism with adjacent fingers of the reflection gratings to reduce spurious longitudinal modes.

Un résonateur à onde de surface bimode comprend deux IDT (transducteurs interdigités), disposés côte à côte entre les réseaux de réflexion, sur la surface d'un substrat piézoélectrique assurant le couplage entre eux des ondes de surface, chaque IDT comportant des électrodes intercalées, disposées à partir d'un rail commun entre les deux IDT et à partir d'un rail extérieur respectif de l'IDT. Un ou chacun des IDT et de son rail extérieur est divisé en deux moitiés établissant une connexion de signal différentiel au résonateur. Les électrodes des IDT peuvent être spatialement synchronisées par rapport aux doigts adjacents des réseaux de réflexion afin de réduire les modes longitudinaux parasites.

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