Elastic wave device
AssigneeFujitsu Limited
InventorsMichio Miura, Suguru Warashina, Takashi Matsuda, Shogo Inoue, Kazunori Inoue, Satoru Matsuda
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Abstract
An elastic wave device is described which includes a piezoelectric substrate, comb-shaped electrodes having teeth electrodes that are disposed so as to face each other on the piezoelectric substrate, a non-overlapping area in which the teeth electrodes of the comb-shaped electrodes do not overlap each other, and a overlapping area in which the teeth electrodes overlap each other and the velocity of sound is higher than that in the non-overlapping area.
Claims14
An elastic wave device comprising:
- a piezoelectric substrate;
- comb-shaped electrodes having teeth electrodes facing each other on the piezoelectric substrate;
- a non-overlapping area in which the teeth electrodes of the comb-shaped electrodes do not overlap each other;
- and
- an overlapping area in which the teeth electrodes overlap each other and the velocity of sound is higher than in the non-overlapping area.
An elastic wave device comprising:
- a piezoelectric substrate;
- comb-shaped electrodes formed on the piezoelectric substrate;
- and
- a reflector adjacent to the comb-shaped electrodes, having a portion in which an overlap width of the comb-shaped electrodes varies, the comb-shaped electrodes have a non-overlapping area in which adjacent electrodes do not overlap each other and an overlapping area in which adjacent electrodes overlap each other, and wherein the reflector has an area having a sound velocity that is lower than the sound velocity of the overlapping area of the comb-shaped electrodes.
A filter equipped with an elastic wave device comprising:
- a piezoelectric substrate;
- comb-shaped electrodes having teeth electrodes facing each other on the piezoelectric substrate;
- a non-overlapping area in which the teeth electrodes of the comb-shaped electrodes do not overlap each other;
- and
- a overlapping area in which the teeth electrodes overlap each other and the velocity of sound is higher than in the non-overlapping area.
A communication module having a filter equipped with an elastic wave device comprising:
- a piezoelectric substrate;
- comb-shaped electrodes having teeth electrodes facing each other on the piezoelectric substrate;
- a non-overlapping area in which the teeth electrodes of the comb-shaped electrodes do not overlap each other;
- and
- an overlapping area in which the teeth electrodes overlap each other and the velocity of sound is higher than that in the non-overlapping area.
A communication device including a communication module having a filter equipped with an elastic wave device comprising:
- a piezoelectric substrate;
- comb-shaped electrodes having teeth electrodes facing each other on the piezoelectric substrate;
- a non-overlapping area in which the teeth electrodes of the comb-shaped electrodes do not overlap each other;
- and
- an overlapping area in which the teeth electrodes overlap each other and the velocity of sound is higher than in the non-overlapping area.
Dependencies are inferred from the claim text.