Acoustic resonator performance enhancements using recessed region
First Claim
Patent Images
1. An acoustic resonator comprising:
- a substrate having a first surface;
a first electrode adjacent the first surface of the substrate;
a layer of piezoelectric material adjacent the first electrode;
a second electrode adjacent the layer of piezoelectric material, the second electrode having a second electrode outer perimeter that is shaped as a polygon; and
a recessed region adjacent the second electrode, wherein the recessed region has a height relative to the second electrode, wherein the recessed region height defines a recessed region outer perimeter, and wherein the recessed region outer perimeter is recessed relative to the second electrode outer perimeter.
13 Assignments
0 Petitions
Accused Products
Abstract
An acoustic resonator includes a substrate, a first electrode, a layer of piezoelectric material, a second electrode, and a recessed region. The substrate has a first surface. The first electrode is adjacent the first surface of the substrate. The layer of piezoelectric material is adjacent the first electrode. The second electrode is adjacent the layer of piezoelectric material. The second electrode has a second electrode perimeter that is shaped as a polygon. The recessed region is adjacent the second electrode. The recessed region has a shape defining a recessed region perimeter. The recessed region perimeter is recessed relative to the second electrode perimeter.
-
Citations
18 Claims
-
1. An acoustic resonator comprising:
-
a substrate having a first surface; a first electrode adjacent the first surface of the substrate; a layer of piezoelectric material adjacent the first electrode; a second electrode adjacent the layer of piezoelectric material, the second electrode having a second electrode outer perimeter that is shaped as a polygon; and a recessed region adjacent the second electrode, wherein the recessed region has a height relative to the second electrode, wherein the recessed region height defines a recessed region outer perimeter, and wherein the recessed region outer perimeter is recessed relative to the second electrode outer perimeter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. An acoustic resonator comprising:
-
a substrate having a first surface; a first electrode over the first surface of the substrate; a layer of piezoelectric material over the first electrode; a second electrode over the layer of piezoelectric material, wherein the second electrode has a second electrode perimeter that is shaped as a polygon and wherein the first electrode, layer of piezoelectric material and the second electrode collectively form a membrane; means for creating a discontinuity of the membrane such that excitation of lateral modes are suppressed; wherein the means for creating a discontinuity comprises a first recessed region having a first recessed region perimeter and wherein the first recessed region perimeter is recessed relative to the second electrode perimeter; and wherein the means for creating a discontinuity further comprises a second recessed region adjacent the first recessed region, the second recessed region having a shape defining a second recessed region perimeter, wherein the second recessed region perimeter is recessed relative to the second electrode perimeter. - View Dependent Claims (12, 13, 14, 15, 16)
-
-
17. A method for fabrication of an acoustic resonator comprising:
-
providing a substrate with a surface; depositing a first electrode adjacent the surface of the substrate; forming a layer of piezoelectric material adjacent the first electrode; depositing a second electrode adjacent the layer of piezoelectric material, the second electrode deposited with a thickness such that its thickness has a second electrode outer perimeter that is shaped as a polygon; and forming a recessed region adjacent the second electrode, the recessed region formed with a thickness such that its thickness defining a recessed region outer perimeter; wherein the recessed region outer perimeter is formed to be recessed relative to the second electrode outer perimeter. - View Dependent Claims (18)
-
Specification