Surface elastic wave element

Abstract

Abstract PURPOSE: To obtain the surface filter excellent in the frequency characteristics, by providing the input transducer on one end through clipping the multistrip coupler and providing the reflection transducer weighted to adjust the quantity of reflection opposing to the input transducer on another end. CONSTITUTION: On the substrate 1 formed with piezoelectric material, the multistrip coupler 7 consisting of a plurality of electrodes is provided, and the input transducer 2 is provided to one end by clipping the coupler 7. Further, on another end, the reflection transducer 8 weighted to adjust the quantity of reflection opposed to the transducer 2, and the output transducer 3 located opposing to the transducer 2 with a slope, are provided. Thus, the quantity of reflection from the output transducer and that frome the reflection transducer can be cancelled over a wide frequency range, allowing to obtain the excellent surface elastic wave filter. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Hisao Iwamoto
• 👤 Noboru Wakatsuki

Bibliographic Details