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US 12,689,351 B2Granted
Elastic wave device, communication device, and piezoelectric substrate
AssigneeKYOCERA Corporation
InventorTomio Kanazawa
Life of this patent
Estimating the term…
Abstract
To improve frequency characteristics of an elastic wave device. The elastic wave device includes a piezoelectric body having a first surface and an electrode including an IDT electrode on the first surface. The piezoelectric body has a first end surface connected to the first surface, the first end surface being an end surface positioned on a first side in a first direction that is orthogonal to an extending direction of any of electrode fingers. A first angle formed by an extended line of the first surface and a tangential line at any point on the first end surface is less than 90°.
Claims29
An elastic wave device comprising:
- a piezoelectric substrate having a piezoelectric body having an upper surface and a first end surface connected to an upper surface, and
- an electrode comprising an IDT electrode comprising a plurality of electrode fingers arrayed on the upper surface,
- wherein the first end surface is positioned outside of the IDT electrode, as viewed in a plan view, in a first direction, the first direction is orthogonal to an extending direction of any of the plurality of electrode fingers, as viewed in the plan view,
- a first angle formed by an extended line of the upper surface in the first direction and a tangential line at any point on the first end surface is 70° or greater and less than 90° on a cross-section obtained by cutting the piezoelectric body parallel to the first direction and perpendicular to the upper surface, and
- the IDT electrode is not enclosed by the first end surface together with any other end surfaces of the piezoelectric body, as viewed in a plan view.
2 more elements
An elastic wave device comprising:
- a piezoelectric substrate having a piezoelectric body having an upper surface and a first end surface connected to the upper surface;
- and
- an electrode comprising an IDT electrode comprising a plurality of electrode fingers arrayed on the upper surface,
- wherein the first end surface is positioned outside of the IDT electrode, as viewed in a plan view, in a first direction the first direction is orthogonal to an extending direction of any of the plurality of electrode fingers, as viewed in the plan view,
- a first angle formed by an extended line of the upper surface in the first direction and a tangential line at any point on the first end surface is less than 90° on a cross-section obtained by cutting the piezoelectric body parallel to the first direction and perpendicular to the upper surface,
- when an average value of intervals of the plurality of electrode fingers in the first direction is set to p, a height of the first end surface is 0.5 p or higher and 2.0 p or less, and
- the IDT electrode is not enclosed by the first end surface together with any other end surfaces of the piezoelectric body, as viewed in a plan view.
4 more elements
An elastic wave device comprising:
- a piezoelectric body having a piezoelectric body having an upper surface and a first end surface connected to the upper surface;
- and
- an electrode comprising an IDT electrode comprising a plurality of electrode fingers arrayed on the upper surface,
- wherein the first end surface is positioned outside of the IDT electrode, as viewed in a plan view, in a first direction the first direction is orthogonal to an extending direction of any of the plurality of electrode fingers, as viewed in the plan view,
- a first angle formed by an extended line of the upper surface in the first direction and a tangential line at any point on the first end surface is less than 90° on a cross-section obtained by cutting the piezoelectric body parallel to the first direction and perpendicular to the upper surface,
- wherein the electrode comprises an end-portion electrode closest to the first end surface,
- when an average value of intervals of the plurality of electrode fingers in the first direction is set to p, a shortest distance between the end-portion electrode and the first end surface is 5 p or shorter, and
- the IDT electrode is not enclosed by the first end surface together with any other end surfaces of the piezoelectric body, as viewed in a plan view.
5 more elements
An elastic device comprising
- a piezoelectric substrate having a piezoelectric body having an upper surface and a first end surface connected to an the upper surface, and
- an electrode comprising an IDT electrode comprising a plurality of electrode fingers arrayed on the upper surface,
- wherein the first end surface is positioned outside of the IDT electrode, as viewed in a plan view, in the first direction, the first direction is orthogonal to an extending direction of any of the plurality of electrode fingers, as viewed in a plan view,
- a first angle formed by an extended line of the upper surface in the first direction and a tangential line at any point on the first end surface is 70° or greater and less than 90° on a cross-section obtained by cutting the piezoelectric body parallel to the first direction and perpendicular to the upper surface, and
- wherein a grating reflector is not located between the IDT electrode and the first end surface in the first direction.
2 more elements
Dependencies are inferred from the claim text.