Patent US5396199A successfully refreshed from Google Patents.
US5396199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface acoustic wave device
Assignee: Mitsubishi Electric Corp
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Filing: 1993-08-27
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Granted: 1995-03-07
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Expires: 2013-08-27
Abstract
Abstract To obtain a surface acoustic wave device which can be produced with ease at a low cost and can be reduced in size without causing deterioration of characteristics, a surface acoustic wave device having input and output transducers arranged alternately on the surface of a substrate for propagating a surface acoustic wave includes metal patterns provided outside the transducers along the extension line of the propagation path of the surface acoustic wave and having at least one surface inclined at an angle θ (5°<θ<85° or -85°<θ<-5°) with respect to the propagation direction of the surface acoustic wave.
Inventors
- 👤 Yoshiko Tera
- 👤 Kouji Morishima
- 👤 Atsushi Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:05
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/64; H03H9/6423; H03H9/643; H03H9/02; H03H9/02535; H03H9/02637; H03H9/02685; H03H9/02771; H03H9/125; H03H9/145; H03H9/14544; H03H9/14547; H03H9/14564; H03H9/14567; H03H9/1457; H03H9/6426
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
221 words
A surface acoustic wave device comprising a substrate for propagating a surface acoustic wave, input transducers for electric and acoustic conversions which are formed on the surface of said substrate, output transducers for electric and acoustic conversions which are formed on the surface of said substrate and arranged alternately with said input transducers in the propagation direction of the surface acoustic wave, and metal patterns which are located outside both said input transducers and said output transducers along the extension line of the propagation direction of the surface acoustic wave, characterized in that each of said metal patterns has an inclined side with respect to the propagation direction of the surface acoustic wave; wherein each of said metal patterns has at least one side inclined at an angle of θ (5°<θ<85° or -85°<θ<-5°) with respect to the propagation direction of the surface acoustic wave; and wherein each of said metal patterns has a first side that the surface acoustic wave propagating from said transducer reaches first and a second side that the surface acoustic wave reaches after passing through an area where said metal pattern is located, both sides being located at the boundary between said metal pattern and said substrate, said first side being perpendicular to the propagation direction of the surface acoustic wave and said second side being inclined.
Claim 2
Dependent Claim
221 words
A surface acoustic wave device comprising a substrate for propagating a surface acoustic wave, input transducers for electric and acoustic conversions which are formed on the surface of said substrate, output transducers for electric and acoustic conversions which are formed on the surface of said substrate and arranged alternately with said input transducers in the propagation direction of the surface acoustic wave, and metal patterns which are located outside both said input transducers and said output transducers along the extension line of the propagation direction of the surface acoustic wave, characterized in that each of said metal patterns has an inclined side with respect to the propagation direction of the surface acoustic wave; wherein each of said metal patterns has at least one side inclined at an angle of θ (5°<θ<85° or -85°<θ<-5°) with respect to the propagation direction of the surface acoustic wave; and wherein each of said metal patterns has a first side that the surface acoustic wave propagating from said transducer reaches first and a second side that the surface acoustic wave reaches after passing through an area where said metal pattern is located, both sides being located at the boundary between said metal pattern and said substrate, said first side being perpendicular to the propagation direction of the surface acoustic wave and said second side being inclined.
Claim 3
Dependent Claim
75 words
The surface acoustic wave device according to claim 1 wherein each of said metal patterns is spaced from said transducer by (2n+1)λ/2 (λ represents a wavelength of the surface acoustic wave) so that the phase of the surface acoustic wave reflected by the end portion of said input or output transducer is different from the phase of the surface acoustic wave reflected by said first side by (2n+1)π (n is a natural number including "0").
Claim 4
Dependent Claim
23 words
The surface acoustic wave device according to claim 2 wherein said substrate for propagating the surface acoustic wave is made of lithium niobate.
Claim 5
Dependent Claim
90 words
The surface acoustic wave device according to claim 3 wherein a plate normal of the surface of said lithium niobate substrate for propagating the surface acoustic wave is inclined at an angle of more than 59° and less than 69° from the Y axis of the crystalline axis toward the Z axis and the propagating direction of the surface acoustic wave forms an angle of more than -5° and less than 5° or more than 175° and less than 185° with respect to the X axis of the crystalline axis.
Claim 6
Dependent Claim
31 words
The surface acoustic wave device according to claim 4 wherein said metal patterns are made of a metal thin film which is combined with said input or output transducer adjacent thereto.
Claim 7
Dependent Claim
15 words
The surface acoustic wave device according to claim 5 wherein said metal patterns are grounded.
Claim 8
Dependent Claim
16 words
The surface acoustic wave device according to claim 5 wherein said metal patterns are not grounded.
Claim 9
Dependent Claim
134 words
A surface acoustic wave device comprising a substrate for propagating a surface acoustic wave, input transducers for electric and acoustic conversions which are formed on the surface of said substrate, output transducers for electric and acoustic conversions which are formed on the surface of said substrate and arranged alternately with said input transducers in the direction of the surface acoustic wave, grating reflectors which are located outside both said input transducers and said output transducers along the extension line of the propagation direction of the surface acoustic wave, and metal patterns which are located outside said grating reflectors along the extension line of the propagation direction of the surface acoustic wave, characterized in that each of said metal patterns has an inclined side with respect to the propagation direction of the surface acoustic wave.
Claim 10
Dependent Claim
134 words
A surface acoustic wave device comprising a substrate for propagating a surface acoustic wave, input transducers for electric and acoustic conversions which are formed on the surface of said substrate, output transducers for electric and acoustic conversions which are formed on the surface of said substrate and arranged alternately with said input transducers in the direction of the surface acoustic wave, grating reflectors which are located outside both said input transducers and said output transducers along the extension line of the propagation direction of the surface acoustic wave, and metal patterns which are located outside said grating reflectors along the extension line of the propagation direction of the surface acoustic wave, characterized in that each of said metal patterns has an inclined side with respect to the propagation direction of the surface acoustic wave.
Claim 11
Dependent Claim
39 words
The surface acoustic wave device according to claim 8 wherein each of said metal patterns has at least one side inclined at an angle θ (5°<θ<85° or -85°<θ<-5°) with respect to the propagation direction of the surface acoustic wave.
Claim 12
Dependent Claim
23 words
The surface acoustic wave device according to claim 9 wherein said substrate for propagating the surface acoustic wave is made of lithium niobate.
Claim 13
Dependent Claim
90 words
The surface acoustic wave device according to claim 10 wherein a plate normal of the surface of said lithium niobate substrate for propagating the surface acoustic wave is inclined at an angle of more than 59° and less than 69° from the Y axis of the crystalline axis toward the Z axis and the propagating direction of the surface acoustic wave forms an angle of more than -5° and less than 5° or more than 175° and less than 185° with respect to the X axis of the crystalline axis.
Claim 14
Dependent Claim
31 words
The surface acoustic wave device according to claim 11 wherein said metal patterns are made of a metal thin film which is combined with said input or output transducer adjacent thereto.
Claim 15
Dependent Claim
33 words
The surface acoustic wave device according to claim 12 wherein said metal patterns are made of a metal thin film which is combined with said input or output transducer adjacent thereto and grounded.
Claim 16
Dependent Claim
34 words
The surface acoustic wave device according to claim 12 wherein said metal patterns are made of a metal thin film which is combined with said input or output transducer adjacent thereto and not grounded.
Claim 17
Dependent Claim
85 words
The surface acoustic wave device according to claim 9 wherein each of said metal patterns has a first side that the surface acoustic wave propagating from said transducer reaches first and a second side that the surface acoustic wave reaches after passing through an area where said metal pattern is located, both sides being located at the boundary between said metal pattern and said substrate, said first side being perpendicular to the propagation direction of the surface acoustic wave and said second side being inclined.
Claim 18
Dependent Claim
73 words
The surface acoustic wave device according to claim 15 wherein each of said metal patterns is spaced from said transducer by (2n+1)λ/2 (λ represents a wavelength of the surface acoustic wave) so that the phase of the surface acoustic wave reflected by the end portion of said grating reflector is different from the phase of the surface acoustic wave reflected by said first side by (2n+1)π (n is a natural number including "0").
Claim 19
Dependent Claim
23 words
The surface acoustic wave device according to claim 16 wherein said substrate for propagating said surface acoustic wave is made of lithium niobate.
Claim 20
Dependent Claim
90 words
The surface acoustic wave device according to claim 17 wherein the plate normal of the surface of said lithium niobate substrate for propagating the surface acoustic wave is inclined at an angle of more than 59° and less than 69° from the Y axis of the crystalline axis toward the Z axis and the propagating direction of the surface acoustic wave forms an angle of more than -5° and less than 5° or more than 175° and less than 185° with respect to the X axis of the crystalline axis.
Claim 21
Dependent Claim
31 words
The surface acoustic wave device according to claim 18 wherein said metal patterns are made of a metal thin film which is combined with said input or output transducer adjacent thereto.
Claim 22
Dependent Claim
15 words
The surface acoustic wave device according to claim 19 wherein said metal patterns are grounded.
Claim 23
Dependent Claim
16 words
The surface acoustic wave device according to claim 19 wherein said metal patterns are not grounded.
Claim 24
Dependent Claim
81 words
The surface acoustic wave device according to claim 9 wherein each of said metal patterns has a first side that the surface acoustic wave propagating from said transducer reaches first and a second side that the surface acoustic wave reaches after passing through an area where said metal pattern is located, both sides being located at the boundary between said metal pattern and said substrate, said first side being inclined with respect to the propagation direction of the surface acoustic wave.
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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) | 1998-03-06 | 1998-09-05 | 1999-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-06 | 2002-09-05 | 2003-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-06 | 2006-09-05 | 2007-03-07 | $7700.00 | Window Closed / Lapsed |