Acoustic wave device
AssigneeMurata Manufacturing Co., Ltd.
InventorsToru Yamaji, Tetsu Takahashi
Life of this patent
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Abstract
An acoustic wave device includes first and second acoustic wave elements. The first acoustic wave element is disposed on a piezoelectric substrate, and includes at least one first IDT electrode. The second acoustic wave element is disposed on the piezoelectric substrate, and includes at least one second IDT electrode. The first and second acoustic wave elements are adjacent to each other in the direction of acoustic wave propagation. A diffracting component that diffracts an acoustic wave is disposed between the first IDT electrode and the second IDT electrode. The diffracting component includes a gap that defines and functions as a slit to diffract an acoustic wave.
Claims19
An acoustic wave device comprising:
- a piezoelectric substrate;
- a first acoustic wave element including at least one first IDT electrode disposed on the piezoelectric substrate;
- and
- a second acoustic wave element including at least one second IDT electrode disposed on the piezoelectric substrate;
- wherein
- an intersecting region of the at least one first IDT electrode and an intersecting region of the at least one second IDT electrode overlap each other in an overlap region in a direction of acoustic wave propagation;
- a diffracting component including a slit is provided in the overlap region;
- the slit has a dimension in a direction orthogonal or substantially orthogonal to the direction of acoustic wave propagation that is smaller than a wavelength of an acoustic wave excited by the first acoustic wave element and a wavelength of an acoustic wave excited by the second acoustic wave element;
- and
- the wavelength of the acoustic wave excited by the first acoustic wave element is different than the wavelength of the acoustic wave excited by the second acoustic wave element.
An acoustic wave device comprising:
- a piezoelectric substrate;
- a first acoustic wave element including at least one first IDT electrode disposed on the piezoelectric substrate;
- and
- a second acoustic wave element including at least one second IDT electrode disposed on the piezoelectric substrate;
- wherein
- an intersecting region of the at least one first IDT electrode and an intersecting region of the at least one second IDT electrode overlap each other in an overlap region in a direction of acoustic wave propagation;
- a diffracting component including a slit is provided in the overlap region;
- the first acoustic wave element includes a first reflector, and the second acoustic wave element includes a second reflector;
- the slit is disposed between the first reflector and the second reflector in the direction of acoustic wave propagation;
- and
- the slit includes a plurality of slits that are serially disposed in a direction orthogonal or substantially orthogonal to the direction of acoustic wave propagation.
An acoustic wave device comprising:
- a piezoelectric substrate;
- a first acoustic wave element including at least one first IDT electrode disposed on the piezoelectric substrate;
- and
- a second acoustic wave element including at least one second IDT electrode disposed on the piezoelectric substrate;
- wherein
- an intersecting region of the at least one first IDT electrode and an intersecting region of the at least one second IDT electrode overlap each other in an overlap region in a direction of acoustic wave propagation;
- a diffracting component including a slit is provided in the overlap region;
- and
- the diffracting component is cut or rounded in a corner area in a portion of the diffracting component facing the slit.
Dependencies are inferred from the claim text.