Surface acoustic wave device for suppressing transverse mode
AssigneeWisol Co., Ltd.
InventorsAh Sung Kim, Chul Hwa Lee
Life of this patent
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Abstract
Disclosed is a surface acoustic wave device including a piezoelectric substrate, first and second bus bars formed on the piezoelectric substrate to be opposite each other, a plurality of first inter-digital electrodes that are electrically connected to the first bus bar and extend from the first bus bar toward the second bus bar, and a plurality of second inter-digital electrodes that are electrically connected to the second bus bar and extend from the second bus bar toward the first bus bar, in which the first inter-digital electrodes and the second inter-digital electrodes are alternately arranged.
Claims4
A surface acoustic wave device comprising:
- a piezoelectric substrate;
- first and second bus bars formed on the piezoelectric substrate to be opposite each other;
- a plurality of first inter-digital electrodes that are electrically connected to the first bus bar and extend from the first bus bar toward the second bus bar;
- and
- a plurality of second inter-digital electrodes that are electrically connected to the second bus bar and extend from the second bus bar toward the first bus bar, in which the first inter-digital electrodes and the second inter-digital electrodes are alternately arranged,
- wherein a central region of the first and second inter-digital electrodes, a first edge region between the central region and the first bus bar, and a second edge region between the central region and the second bus bar are defined according to a wave propagation direction, and
- wherein protruding portions are formed at only the second inter-digital electrodes in the first edge region and formed at only the first inter-digital electrodes in the second edge region to allow wave velocities in the first and second edge regions to be smaller than a wave velocity in the central region.
Dependencies are inferred from the claim text.