US3634774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic surface wave parametric amplifier
Assignee: United States Department of the Air Force
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Filing: 1970-07-15
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Granted: 1972-01-11
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Expires: 1990-07-15
Abstract
Abstract The acoustic surface-wave signal resulting from colinear interaction of pump and input signals is found to have an amplifying difference signal component and an overriding attenuating sum signal component. Amplification is achieved by noncolinear interaction of acoustic surface waves at an angle that utilizes the elastic anisotropic characteristics of certain substrate materials to suppress the sum signal component.
Inventors
- 👤 Paul H Carr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:29
CPC Classifications
H; H03; H03F; H03F13/00; H03F7/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
The method of providing parametric amplification of an acoustic surface-wave input signal propagating on the surface of an elastically anisotropic substrate member comprising the step of applying an acoustic surface-wave pump signal to said substrate member to interact with said surface-wave input signal at an angle that effects substantial suppression of the sum frequency components generated by the interaction of said input and pump signals.
Claim 2
Independent Claim
65 words
The method of providing parametric amplification of an acoustic surface-wave input signal propagating on the surface of an elastically anisotropic substrate member comprising the step of applying an acoustic surface-wave pump signal to said substrate member to interact with said surface-wave input signal at an angle that effects substantial suppression of the sum frequency components generated by the interaction of said input and pump signals.
Claim 3
Dependent Claim
23 words
The method of claim 1 including the further step of applying at least one additional acoustic surface-wave pump signal to said substrate member.
Claim 4
Dependent Claim
20 words
The method of claim 1 including the further step of reflecting said pump signal to reinteract with said surface-wave signal.
Claim 5
Dependent Claim
128 words
An amplifier comprising a substrate member of elastically anisotropic material having a surface adapted to permit the propagation of acoustic surface waves therealong, a first electromagnetic wave to acoustic surface-wave input transducer disposed on the propagation surface of said substrate member, an acoustic surface wave to electromagnetic wave transducer disposed on said propagation surface in position to receive acoustic surface waves emanating from said input transducer, a second electromagnetic wave to acoustic surface-wave input transducer disposed on said propagation surface oriented to effect angular interception of acoustic surface waves emanating therefrom with acoustic surface waves emanating from said first input transducer, means for applying an electromagnetic wave input signal to said first input transducer, and means for applying an electromagnetic wave pump signal to said second input transducer.
Claim 6
Dependent Claim
128 words
An amplifier comprising a substrate member of elastically anisotropic material having a surface adapted to permit the propagation of acoustic surface waves therealong, a first electromagnetic wave to acoustic surface-wave input transducer disposed on the propagation surface of said substrate member, an acoustic surface wave to electromagnetic wave transducer disposed on said propagation surface in position to receive acoustic surface waves emanating from said input transducer, a second electromagnetic wave to acoustic surface-wave input transducer disposed on said propagation surface oriented to effect angular interception of acoustic surface waves emanating therefrom with acoustic surface waves emanating from said first input transducer, means for applying an electromagnetic wave input signal to said first input transducer, and means for applying an electromagnetic wave pump signal to said second input transducer.
Claim 7
Dependent Claim
62 words
An amplifier as defined in claim 4 wherein said second input transducer is oriented to effect an interaction between the pump signal acoustic surface waves emanating therefrom and the input signal acoustic surface wave emanating from said first input transduceR at an angle that effects substantial suppression of the sum frequency components generated by the interaction of said input and pump signals.
Claim 8
Dependent Claim
60 words
An amplifier as defined in claim 4 including at least one additional electromagnetic wave to acoustic surface-wave input transducer, said additional input transducers being oriented to effect angular interception of acoustic surface waves emanating therefrom with acoustic surface waves emanating from said first input transducer, and means for applying an electromagnetic wave pump signals to each said additional input transducer.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |