Component with surface acoustic waves eliminating...

Details Component with surface acoustic waves eliminating... Component with surface acoustic waves eliminating...

H - Electricity

03

H

H03H 9/02 (2006.01)

Patent

CA 2263358

The invention concerns a component with surface acoustic waves including a substrate made of piezoelectric and pyroelectric material with electric conductivity sigma o, comprising on one of its surface an electroacoustic transducer connected to an input (E), an output (S) and an earth connection (PM), said material having an electric polarisation P. The invention is characterised in that the surface of the planes perpendicular to the polarisation P have an electric conductivity sigma o, and are connected to the earth (PM) so as to enable the current sink of pyroelectric charges occurring during the operation of the electroacoustic transducer. The invention is applicable in telecommunication filtering.

L'invention concerne un composant à ondes acoustiques de surface comprenant un substrat en matériau piezoélectrique et pyroélectrique de conductivité électrique .sigma. o, comportant sur l'une de ses faces un transducteur électroacoustique relié à une entrée (E), une sortie (S) et une masse (PM), ledit matériau présentant une polarisation électrique P, caractérisée en ce que les faces des plans perpendiculaires à la polarisation P ont une conductivité électrique .sigma. supérieure à la conductivité électrique .sigma. o, et sont reliées à la masse (PM) de manière à permettre l'écoulement de charges pyroélectriques apparaissant en fonctionnement du transducteur électroacoustique. Application: filtrage en télécommunication.

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