US4078186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetically tuned, surface acoustic wave device
Assignee: United States Department of the Navy
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Filing: 1976-10-21
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Granted: 1978-03-07
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Expires: 1996-10-21
Abstract
Abstract A surface acoustic wave device having a thin magnetostrictive film deposi on the surface between its input and output transducers. A variable D.C. field is applied to the film to vary its characteristics and thereby correspondingly continuously vary the delay or phase shift of the surface acoustic wave.
Inventors
- 👤 Vincent J. Folen
- 👤 Carmine Vittoria
- 👤 Denis C. Webb
- 👤 Kenneth L. Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:21
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/25; G; G10; G10K; G10K11/00; G10K11/36; H03H9/02; H03H9/02535; H03H9/0296
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
79 words
In a SAW device comprising a substrate capable of supporting surface wave propagation and having an input transducer and an output transducer both mounted on a surface of said substrate, the improvement comprising: a thin film of magnetostrictive material bonded to said surface of said substrate in the path of propagation of surface waves generated by said input transducer; and means for applying a continuously variable, D.C. magnetic field to said film to continuously vary the signal propagation velocity.
Claim 2
Dependent Claim
79 words
In a SAW device comprising a substrate capable of supporting surface wave propagation and having an input transducer and an output transducer both mounted on a surface of said substrate, the improvement comprising: a thin film of magnetostrictive material bonded to said surface of said substrate in the path of propagation of surface waves generated by said input transducer; and means for applying a continuously variable, D.C. magnetic field to said film to continuously vary the signal propagation velocity.
Claim 3
Dependent Claim
25 words
The improvement of claim 1, wherein: the direction of said D.C. magnetic field is the same as the direction of propagation of said acoustic wave.
Claim 4
Dependent Claim
21 words
The improvement of claim 1, wherein: the thickness of said film lies in the approximate range of 0.5 to 10 μm.
Claim 5
Dependent Claim
22 words
The improvement of claim 1, wherein: the film is fabricated from a rare-earth alloy exhibiting high magnetostriction and low magneto crystalline anisotropy.
Claim 6
Dependent Claim
20 words
The device of claim 1, wherein: said substrate is formed from LiNbO 3 and said film is formed from Ni.
Claim 7
Dependent Claim
98 words
A SAW device is continuously tunable comprising: a substrate having a surface and formed from an acoustic piezoelectric material; input and output transducer means spaced from each other and mounted on said substrate surface so that an acoustic surface wave can be propagated along said surface from the input to the output transducer means; a thin film of magnetostrictive material bonded to said surface in the path of propagation of surface wave generated by said input transducer; and means for applying a continuously variable D.C. magetic field to said film to continuously vary the acoustic surface wave velocity.
Claim 8
Dependent Claim
98 words
A SAW device is continuously tunable comprising: a substrate having a surface and formed from an acoustic piezoelectric material; input and output transducer means spaced from each other and mounted on said substrate surface so that an acoustic surface wave can be propagated along said surface from the input to the output transducer means; a thin film of magnetostrictive material bonded to said surface in the path of propagation of surface wave generated by said input transducer; and means for applying a continuously variable D.C. magetic field to said film to continuously vary the acoustic surface wave velocity.
Claim 9
Dependent Claim
25 words
The device of claim 6, wherein: the direction of said D.C. magnetic field is the same as the direction of propagation of said acoustic wave.
Claim 10
Dependent Claim
21 words
The device of claim 6, wherein: the thickness of said film lies in the approximate range of 0.5 to 10 μm.
Claim 11
Dependent Claim
17 words
The device of claim 6, wherein: the film is fabricated from a rare-earth alloy exhibiting high magnetostriction.
Claim 12
Dependent Claim
20 words
The device of claim 6, wherein: said substrate is formed from LiNbO 3 and said film is formed from Ni.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |