US3614463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave acoustic surface wave limiter and method of fabrication
Assignee: United States Department of the Air Force
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Filing: 1970-04-01
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Granted: 1971-10-19
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Expires: 1990-04-01
Abstract
Abstract Effective limiting is achieved in a microwave acoustic surface wave device by positioning the output transducer on the acoustic wave propagation surface of a piezoelectric substrate member at a particular distance from the input transducer. Acoustic surface wave fundamental and harmonic power densities along the substrate member are measured and recorded. The output transducer is positioned at the point of maximum harmonic-fundamental interaction. Electromagnetic wave power limits are set by transducer geometry.
Inventors
- 👤 Andrew J Slobodnik Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:44
CPC Classifications
H; H03; H03F; H03F13/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
81 words
A limiter comprising a substrate meMber of piezoelectric material having a propagation surface adapted to permit the propagation of acoustic surface waves therealong, an electromagnetic wave to acoustic surface-wave input transducer disposed on said propagation surface, and an acoustic surface wave to electromagnetic wave output transducer disposed on said propagation surface, said output transducer being positioned at a point on said substrate member substantially coinciding with the first power density minimum of an acoustic surface-wave fundamental propagating from said input transducer.
Claim 2
Dependent Claim
81 words
A limiter comprising a substrate meMber of piezoelectric material having a propagation surface adapted to permit the propagation of acoustic surface waves therealong, an electromagnetic wave to acoustic surface-wave input transducer disposed on said propagation surface, and an acoustic surface wave to electromagnetic wave output transducer disposed on said propagation surface, said output transducer being positioned at a point on said substrate member substantially coinciding with the first power density minimum of an acoustic surface-wave fundamental propagating from said input transducer.
Claim 3
Dependent Claim
28 words
A limiter as defined in claim 1 wherein said input and output transducers each comprise interdigital members spaced so as to be tuned to the limiter operating frequency.
Claim 4
Dependent Claim
20 words
A limiter as defined in claim 2 wherein said interdigital members have lengths adapted to determine total limited power capacity.
Claim 5
Dependent Claim
14 words
A limiter as defined in claim 3 wherein said substrate member is lithium niobate.
Claim 6
Independent Claim
127 words
The method of fabricating a limiter comprising the steps of rendering one surface of a piezoelectric substrate member suitable for the propagation of acoustic surface waves, affixing an electromagnetic wave to acoustic surface-wave input transducer to said surface, applying an electromagnetic wave input signal of a given frequency to said input transducer, measuring and recording the power densities of the acoustic surface-wave fundamental response to said electromagnetic wave input signal propagating along said substrate member, measuring and recording the power densities of certain harmonics of said acoustic surface wave, and affixing an acoustic surface wave to electromagnetic wave output transducer to said substrate member propagation surface at a point substantially coinciding with the point of maximum interaction between the fundamental and harmonics of said acoustic surface wave.
Claim 7
Independent Claim
127 words
The method of fabricating a limiter comprising the steps of rendering one surface of a piezoelectric substrate member suitable for the propagation of acoustic surface waves, affixing an electromagnetic wave to acoustic surface-wave input transducer to said surface, applying an electromagnetic wave input signal of a given frequency to said input transducer, measuring and recording the power densities of the acoustic surface-wave fundamental response to said electromagnetic wave input signal propagating along said substrate member, measuring and recording the power densities of certain harmonics of said acoustic surface wave, and affixing an acoustic surface wave to electromagnetic wave output transducer to said substrate member propagation surface at a point substantially coinciding with the point of maximum interaction between the fundamental and harmonics of said acoustic surface wave.
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |