Patent US3840825A successfully refreshed from Google Patents.
US3840825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite acoustic surface wave devices with bridge-like coupling film
Assignee: Raytheon Co
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Filing: 1973-08-03
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Granted: 1974-10-08
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Expires: 1993-08-03
Abstract
Abstract Arrangements are disclosed for efficiently transmitting acoustic surface wave energy across an interface between different elements of acoustic surface wave propagating material as well as over a discontinuity in an acoustic surface wave propagating substrate. An acoustic wave-guiding film spans the interface between a pair of slabs of acoustic surface wave propagating material (or a surface discontinuity in a single substrate) and overlies an adjacent surface portion of each slab. The waveguiding film has tapered end portions of a thickness which decreases as a function of distance from the slab interface. Also disclosed is an acoustic surface wave delay line having transducer-supporting pads of a piezoelectric material acoustically coupled to respective ends of an elongated strip of a relatively temperature insensitive material capable of propagating acoustic surface waves.
Inventors
- 👤 H Gerard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:18
CPC Classifications
H; H03; H03H; H03H3/00; H03H3/007; H03H3/08; H03H3/10
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
45 words
An acoustic surface wave coupling arrangement comprising: an element of a material capable of propagating acoustic surface waves and having an acoustic wave propagating surface defining a surface defect therein; and an acoustic wave-guiding film overlying said defect and an adjacent portion of said surface.
Claim 2
Dependent Claim
45 words
An acoustic surface wave coupling arrangement comprising: an element of a material capable of propagating acoustic surface waves and having an acoustic wave propagating surface defining a surface defect therein; and an acoustic wave-guiding film overlying said defect and an adjacent portion of said surface.
Claim 3
Dependent Claim
34 words
An acoustic surface wave coupling arrangement according to claim 1 wherein the thickness of said film in the region adjacent said defect is not less than about one-half wavelength of said acoustic surface waves.
Claim 4
Dependent Claim
46 words
An acoustic surface wave coupling arrangement according to claim 1 wherein said film has first and second tapered end portions overlying respective portions of said surface near said defect, the thickness of each of said tapered portions decreasing as a function of distance from said defect.
Claim 5
Dependent Claim
35 words
An acoustic surface wave coupling arrangement according to claim 3 wherein each of said tapered portions has an extent along the direction of taper not less than about 20 wavelengths of said acoustic surface waves.
Claim 6
Dependent Claim
45 words
An acoustic surface wave coupling arrangement comprising: first and second distinct elements of a material capable of propagating acoustic surface waves disposed adjacent to one another; and an acoustic wave-guiding film overlying a portion of an acoustic wave propagating surface of each of said elements.
Claim 7
Dependent Claim
45 words
An acoustic surface wave coupling arrangement comprising: first and second distinct elements of a material capable of propagating acoustic surface waves disposed adjacent to one another; and an acoustic wave-guiding film overlying a portion of an acoustic wave propagating surface of each of said elements.
Claim 8
Dependent Claim
26 words
An acoustic surface wave coupling arrangement according to claim 5 wherein the material of said first element is different from the material of said second element.
Claim 9
Dependent Claim
51 words
An acoustic surface wave coupling arrangement comprising: first and second slabs of a material capable of propagating acoustic surface waves disposed in end-to-end relationship and joined to one another at a common interface; and an acoustic wave-guiding film overlying said interface and an adjacent surface portion of each of said slabs.
Claim 10
Dependent Claim
51 words
An acoustic surface wave coupling arrangement comprising: first and second slabs of a material capable of propagating acoustic surface waves disposed in end-to-end relationship and joined to one another at a common interface; and an acoustic wave-guiding film overlying said interface and an adjacent surface portion of each of said slabs.
Claim 11
Dependent Claim
72 words
An acoustic surface wave device comprising: first and second slabs of a material capable of propagating acoustic surface wave energy disposed in end-to-end relationship and joined to one another at a common interface; means for launching acoustic surface waves on a surface of said first slab; and an acoustic wave-guiding film overlying said interface and respective adjacent portions of said surface of said first slab and a surface of said second slab.
Claim 12
Dependent Claim
72 words
An acoustic surface wave device comprising: first and second slabs of a material capable of propagating acoustic surface wave energy disposed in end-to-end relationship and joined to one another at a common interface; means for launching acoustic surface waves on a surface of said first slab; and an acoustic wave-guiding film overlying said interface and respective adjacent portions of said surface of said first slab and a surface of said second slab.
Claim 13
Dependent Claim
33 words
An acoustic surface wave device according to claim 8 wherein the thickness of said film in the region adjacent said interface is not less than about one-half wavelength of said acoustic surface waves.
Claim 14
Dependent Claim
45 words
An acoustic surface wave device according to claim 8 wherein said film has first and second tapered end portions overlying respective portions of said first and second slabs, the thickness of each of said tapered portions decreasing as a function of distance from said interface.
Claim 15
Dependent Claim
41 words
An acoustic surface wave device according to claim 8 wherein said first slab is of LiNbO3, said second slab is of ST-cut quartz, and said wave-guiding film is of a material selected from the group consisting of gold, aluminum and nickel.
Claim 16
Dependent Claim
34 words
An acoustic surface wave device according to claim 10 wherein each of said tapered portions has an extent along the direction of taper not less than about 20 wavelengthS of said acoustic surface waves.
Claim 17
Dependent Claim
75 words
An acoustic surface wave device comprising: a substrate; a first layer of a material capable of propagating acoustic surface waves disposed on said substrate; a second layer of piezoelectric material disposed on said substrate near said first layer, means for launching acoustic surface waves on a surface of said second layer; and an acoustic wave-guiding film disposed on said substrate and overlying a portion of the surface of each of said first and second layers.
Claim 18
Dependent Claim
75 words
An acoustic surface wave device comprising: a substrate; a first layer of a material capable of propagating acoustic surface waves disposed on said substrate; a second layer of piezoelectric material disposed on said substrate near said first layer, means for launching acoustic surface waves on a surface of said second layer; and an acoustic wave-guiding film disposed on said substrate and overlying a portion of the surface of each of said first and second layers.
Claim 19
Dependent Claim
104 words
An acoustic surface wave delay line comprising: a substrate; an elongated strip of a material capable of propagating acoustic surface waves disposed on said substrate; first and second pads of piezoelectric material disposed on said substrate adjacent respective ends of said strip, an electro-acoustic transducer disposed on each of said pads; and first and second acoustic wave-guiding films disposed on respective regions of said substrate between respective ends of said strip and the adjacent one of said pads, each said film overlying an adjacent portion of the surface of said strip and a portion of the surface of the adjacent one of said pads.
Claim 20
Dependent Claim
104 words
An acoustic surface wave delay line comprising: a substrate; an elongated strip of a material capable of propagating acoustic surface waves disposed on said substrate; first and second pads of piezoelectric material disposed on said substrate adjacent respective ends of said strip, an electro-acoustic transducer disposed on each of said pads; and first and second acoustic wave-guiding films disposed on respective regions of said substrate between respective ends of said strip and the adjacent one of said pads, each said film overlying an adjacent portion of the surface of said strip and a portion of the surface of the adjacent one of said pads.
Claim 21
Dependent Claim
45 words
An acoustic surface wave delay line according to claim 14 wherein said substrate is of ST-cut quartz, said strip is of silica, said pads are of ZnO, and said wave-guiding films are of a material selected from the group consisting of gold, aluminum and nickel.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |