US4625138A
Expired / Lapsed
US
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Piezoelectric microwave resonator using lateral excitation
Assignee: United States Department of the Army
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Filing: 1986-01-30
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Granted: 1986-11-25
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Expires: 2006-01-30
Abstract
Abstract An improvement in piezoelectric crystal resonators using lateral excitation whereby energy of vibration trapped in a region between the electrodes is provided by the inclusion of recessed electrodes adjacent a relatively raised piezoelectric region on at least one major face or surface of the crystal. The recessed electrodes oppose one another in either a horizontal or a vertical direction to generate a lateral field in the body of the crystal upon excitation. Additionally, curved edge interfaces are provided between the recessed electrodes and the piezoelectric crystal material to reduce field gradients. Tapered electrodes which have the effect of increasing the energy trapping in the gap between the electrodes are also disclosed.
Inventors
- 👤 Arthur Ballato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:25
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/54; H03H9/56
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
116 words
A piezoelectric resonator activated by a lateral excitation, comprising: a body of piezoelectric material including a pair of opposing major faces; and means for providing lateral excitation of said body of piezoelectric material, said means including a pair of spaced recesses on opposite sides of a central open area of said body, a pair of electrodes located in said recesses on said opposite sides, a surface of said area between said electrodes being raised above the uppermost level of said electrodes, and signal generator means connected to said electrodes on said opposite sides to apply said lateral excitation, said central area providing a piezoelectric gap region for energy trapping in said central area of said body.
Claim 2
Dependent Claim
116 words
A piezoelectric resonator activated by a lateral excitation, comprising: a body of piezoelectric material including a pair of opposing major faces; and means for providing lateral excitation of said body of piezoelectric material, said means including a pair of spaced recesses on opposite sides of a central open area of said body, a pair of electrodes located in said recesses on said opposite sides, a surface of said area between said electrodes being raised above the uppermost level of said electrodes, and signal generator means connected to said electrodes on said opposite sides to apply said lateral excitation, said central area providing a piezoelectric gap region for energy trapping in said central area of said body.
Claim 3
Dependent Claim
31 words
The resonator as defined by claim 1 wherein said lateral excitation means includes first and second pairs of recesses and electrodes respectively located on both of said pair of major faces.
Claim 4
Dependent Claim
18 words
The resonator as defined by claim 2 wherein said central area of said body is a mesa region.
Claim 5
Dependent Claim
50 words
The resonator as defined by claim 3 wherein said second pair of electrodes is separated on the other of said faces by a second mesa region of piezoelectric material of said body having an outer surface which lies in a plane above the surface of said second pair of electrodes.
Claim 6
Dependent Claim
25 words
The resonator as defined by claim 3 wherein said pairs of electrodes have a predetermined length on the surfaces of said pair of major faces.
Claim 7
Dependent Claim
27 words
The resonator as defined by claim 3 wherein the interface between said electrodes and said body of piezoelectric material includes rounded corners for reducing field gradients therebetween.
Claim 8
Dependent Claim
38 words
The resonator as defined by claim 3 wherein said electrode means includes tapered electrodes whose thickness decreases in an outward direction from the center of said body of piezoelectric material for enhancing energy trapping in said gap region.
Claim 9
Dependent Claim
56 words
The resonator as defined by claim 3 where said second pair of electrodes is located in like respective recesses formed on the other of said pair of major faces, the second pair of recesses being in registration with the first pair of recesses and having the same mutual separation therebetween for further defining said gap region.
Claim 10
Dependent Claim
16 words
The resonator as defined by claim 5 wherein said electrodes have substantially the same predetermined length.
Claim 11
Dependent Claim
84 words
The resonator as defined by claim 1 wherein said central area has a raised surface on one of said opposing faces of said body and wherein said recesses include first and second vertical slots formed in said at least one face of said pair of major faces outwardly of and adjacent said central raised area and including electrodes deposited therein and wherein said central area between the slots containing said electrodes defines said gap region wherein energy of vibration is trapped upon resonator excitation.
Claim 12
Dependent Claim
97 words
The resonator as defined by claim 1 wherein said central area has raised surfaces on both of said opposing faces of said body and wherein said recesses include a first vertical slot formed in one of said pair of major faces outwardly of an adjacent said central area and a second slot formed in the other of said pair of major faces outwardly of and adjacent said central area, said central area thereby defining said gap region and including electrodes deposited in said slots, whereby energy of vibration is trapped in said gap region upon resonator excitation.
Claim 13
Dependent Claim
91 words
The resonator as defined by claim 1 wherein said central area has a raised surface on both of said opposing faces of said body and said recesses include a pair of slots formed through the body of said piezoelectric material outwardly of said central area and substantially transverse to said pair of major faces, said vertical slots including a predetermined thickness layer of electrode material formed on the outer walls of said slots, said central areas thereby defining a gap region for the trapping of energy of vibrations upon resonator excitation.
Claim 14
Dependent Claim
24 words
The resonator as defined by claim 1 wherein said body has a plate-like configuration with both of said opposing major faces being substantially flat.
Claim 15
Dependent Claim
24 words
The resonator as defined by claim 1 wherein said body has a lens-like configuration with both of said opposing major faces being substantially convex.
Claim 16
Dependent Claim
32 words
The resonator as defined by claim 1 wherein said body has a plano-convex configuration with one of said opposing major faces being substantially convex and the other said face being substantially flat.
Claim 17
Dependent Claim
34 words
The resonator as defined by claim 14 wherein said lateral excitation means includes first and second pairs of recesses and electrodes respectively located on the surfaces of both of said pair of major faces.
Claim 18
Dependent Claim
34 words
The resonator as defined by claim 15 wherein said lateral excitation means includes first and second pairs of recesses and electrodes respectively located on the surfaces of both of said pair of major faces.
Claim 19
Dependent Claim
36 words
The resonator as defined by claim 15 wherein said lateral excitation means includes a first pair of recesses and electrodes located on said convex face and a second pair of electrodes located on said flat face.
Claim 20
Dependent Claim
21 words
The resonator as defined by claim 16 wherein the thickness of said electrodes is less than the depth of said recesses.
Claim 21
Dependent Claim
27 words
The resonator as defined by claim 16 wherein the interfaces between said electrodes and said body of piezoelectric material includes rounded corners for reducing field gradients therebetween.
Claim 22
Dependent Claim
27 words
The resonator as defined by claim 19 wherein the interfaces between said electrodes and said body of piezoelectric material includes rounded corners for reducing field gradients therebetween.
Claim 23
Dependent Claim
38 words
The resonator as defined by claim 16 wherein said electrode means includes tapered electrodes whose thickness decreases in an outward direction from the center of said body of piezoelectric material for enhancing energy trapping in said gap region.
Claim 24
Dependent Claim
21 words
The resonator as defined by claim 22 wherein the thickness of said electrodes is less than the depth of said recesses.
Claim 25
Dependent Claim
21 words
The resonator as defined by claim 17 wherein the thickness of sald electrodes is less than the depth of said recesses.
Claim 26
Dependent Claim
27 words
The resonator as defined by claim 18 wherein the thickness of said first pair of electrodes is less than the depth of said first pair of recesses.
Claim 27
Dependent Claim
27 words
The resonator as defined by claim 17 wherein the interfaces between said electrodes and said body of piezoelectric material includes rounded corners for reducing field gradients therebetween.
Claim 28
Dependent Claim
27 words
The resonator as defined by claim 18 wherein the interfaces between said first pair of electrodes and said recesses includes rounded corners for reducing field gradients therebetween.
Claim 29
Dependent Claim
25 words
The resonator as defined by claim 26 wherein the thickness of at 1east one pair of electrodes is less than the depth of said recesses.
Claim 30
Dependent Claim
22 words
The resonator as defined by claim 27 wherein the thickness of said first electrodes is less than the depth of said recesses.
Claim 31
Dependent Claim
38 words
The resonator as defined by claim 17 wherein said electrode means includes tapered electrodes whose thickness decreases in an outward direction from the center of said body of piezoelectric material for enhancing enery trapping in said gap region.
Claim 32
Dependent Claim
39 words
The resonator as defined by claim 18 wherein said first pair of electrodes is tapered, their thickness decreasing in an outward direction from the center of said body of piezoelectric material for enhancing energy trapping in said gap region.
Claim 33
Dependent Claim
14 words
The resonator as defined by claim 10 wherein said body has a plano-convex configuration.
Claim 34
Dependent Claim
14 words
The resonator as defined by claim 10 wherein said body has a convex-convex configuration.
Claim 35
Dependent Claim
14 words
The resonator as defined by claim 11 wherein said body has a plano-convex configuration.
Claim 36
Dependent Claim
14 words
The resonator as defined by c1aim 11 wherein said body has a convex-convex configuration.
Claim 37
Dependent Claim
14 words
The resonator as defined by c1aim 11 wherein said body has a convex-convex configuration.
Claim 38
Dependent Claim
14 words
The resonator as defined by claim 12 wherein said body has a plano-convex configuration.
Claim 39
Dependent Claim
14 words
The resonator as defined by claim 12 wherein said body has a convex-convex configuration.
Claim 40
Dependent Claim
15 words
The resonator as defined by claim 10 wherein said body has a slotted ring configuration.
Claim 41
Dependent Claim
15 words
The resonator as defined by claim 11 wherein said body has a slotted ring configuration.
Claim 42
Dependent Claim
15 words
The resonator as defined by claim 12 wherein said body has a slotted ring configuration.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |