SURFACE ACOUSTIC WAVE DEVICE AND FILTER

摘要

A surface acoustic wave device includes: comb electrodes that are provided on a piezoelectric substrate, respectively has a plurality of electrode fingers, a plurality of dummy electrode fingers and a bus bar, edges of the electrode fingers of one of the comb electrodes facing the dummy electrode fingers of the other; and an added film that is provided at least under the bus bar of the comb electrodes and under the electrode fingers and the dummy electrode fingers in a first region and is not provided in a crossing region where the electrode fingers of the one of the comb electrodes and the electrode fingers of the other cross each other, the first region being a region between front edges of the dummy electrodes and edges of the dummy electrodes connected to the bus bar and extending in an alignment direction of the electrode fingers.

主权项

1. A surface acoustic wave device comprising:
a pair of comb electrodes that are provided on a piezoelectric substrate, respectively has a plurality of electrode fingers, a plurality of dummy electrode fingers and a bus bar to which the plurality of the electrode fingers and the plurality of the dummy electrodes are connected, edges of the plurality of the electrode fingers of one of the comb electrodes facing the plurality of the dummy electrode fingers of the other; and an added film that is provided at least under the bus bar of the pair of the comb electrodes and under the plurality of the electrode fingers and the plurality of the dummy electrode fingers in a first region and is not provided in a crossing region where the plurality of the electrode fingers of the one of the comb electrodes and the plurality of the electrode fingers of the other cross each other, the first region being a region between front edges of the plurality of the dummy electrodes and edges of the plurality of the dummy electrodes connected to the bus bar and extending in an alignment direction of the plurality of the electrode fingers.