Back to results
US 7,453,184 B2Granted
Boundary acoustic wave device
AssigneeMurata Manufacturing Co., Ltd.
InventorHajime Kando
Life of this patent
Estimating the term…
Abstract
A boundary acoustic wave device includes a LiNbO3 substrate defining a first medium layer having a relatively high sound velocity and a SiO2 film defining a second medium layer having a relatively low sound velocity, an electroacoustic transducer and reflectors disposed between the first medium layer and the second medium layer, and recess portions and/or protrusion portions provided in the upper surface of the SiO2 film.
Claims19
A boundary acoustic wave device comprising:
- a first medium layer and a second medium layer arranged such that a boundary acoustic wave propagates along a boundary between the first medium layer and the second medium layer;
- wherein
- a sound velocity of the second medium layer is lower than a sound velocity of the first medium layer, and a thickness of the second medium layer is at least about 7 λ, where the wavelength of the boundary acoustic wave is represented by λ.
A boundary acoustic wave device comprising:
- a first medium layer and a second medium layer arranged such that a boundary acoustic wave propagates along a boundary between the first medium layer and the second medium layer;
- wherein
- a wave scattering structure is arranged to scatter an acoustic wave and disposed on at least one surface of the first and second medium layers at a side opposite to a boundary surface therebetween;
- and
- a sound velocity of the second medium layer is less that a sound velocity of the first medium layer, and the wave scattering structure is provided on the second medium layer.
2 more elements
Dependencies are inferred from the claim text.