US3609416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microacoustic surface-wave transducer
Assignee: Northwestern University
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Filing: 1970-08-12
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Granted: 1971-09-28
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Expires: 1990-08-12
Abstract
Abstract A surface-wave transducer, fulfilling in a single structure the requirements of both electric and acoustic matching. There is also disclosed a convenient technique for the transduction of signals having a wide frequency bandwidth. The transducer used can be produced utilizing simple photoetching techniques and may be employed at extremely high frequencies.
Inventors
- 👤 Max Epstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:55
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/125; H03H9/145; H03H9/14544; H03H9/14561
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
55 words
The structure as set forth in claim 1 wherein said second array consists of conductive elements extending generally normally of segments of said first array, said conductive elements of said second array beiNg spaced from one another a distance less than an acoustic wavelength to preclude generation, transmission, and reception of said acoustic wave thereby.
Claim 2
Dependent Claim
40 words
The structure as set forth in claim 1 wherein said second array of conductors extends generally normally of segments of said first array and in a plane generally perpendicular to a plane defined by said segments of said first array.
Claim 3
Dependent Claim
67 words
The structure as set forth in claim 1 wherein said coupling means comprises a pair of spiral coils wound in parallel, each said coils including a first array of parallel conducting segments in which adjacent said segments are spaced an acoustic wavelength from each other, and a second array of parallel conducting segments in which adjacent said segments are spaced one-half of an acoustic wave length apart.
Claim 4
Dependent Claim
93 words
The structure as set forth in claim 1 wherein said electrode comprises a generally rectangular spiral loop, said loop comprising a first array of conductive straight sections extending in a direction to transmit and to receive an acoustic wave impinging thereupon, said straight sections of said first array being spaced an acoustic wavelength from each other, a second array of straight sections extending generally normally to said sections of said first array and being spaced from one another a distance to preclude reception of acoustic waves thereby and generation of acoustic waves therefrom.
Claim 5
Dependent Claim
44 words
The structure as set forth in claim 1 and further comprising means to regulate a distributed inductance parameter of said microwave transducer, and comprising a ferrite plate extending in a plane generally paralleling a plane defined by said spirally looped electrode and space therefrom.
Claim 6
Dependent Claim
51 words
The structure as set forth in claim 1 and further comprising means to regulate a disturbed capacitance of said microwave transducer, and comprising a substrate, said substrate constituting a support for said spirally looped electrode deposited thereon, variation of thickness of said substrate affecting a distributed capacitance parameter of said transducer.
Claim 7
Dependent Claim
45 words
The structure as set forth in claim 1 and further comprising a metallic backing plate spaced from and generally paralleling a plane defined by said spirally looped electrode, spatial separation of said electrode from said backing plate affecting a distributed capacitance parameter of said transducer.
Claim 8
Dependent Claim
27 words
The structure as set forth in claim 8 and further comprising a substrate interposed between said metallic backing plate and said electrode and constituting a support therefor.
Claim 9
Dependent Claim
107 words
The structure as set forth in claim 1 wherein said electrode comprises a generally rectangular spiral loop, said loop comprising: a first array of spaced conductive straight sections extending in a direction to transmit and to receive an acoustic wave impinging thereupon, and a second array of straight sections extending generally normally to said sections of said first array and being spaced from one another a distance to preclude reception of acoustic waves thereby and generally of acoustic waves therefrom, spacing of said sections of said first array from each other being nonuniform from section to section, thereby to facilitate generation of elastic waves over wide-frequency bands.
Claim 10
Dependent Claim
22 words
The structure as set forth in claim 10 wherein said spacings of said sections of said first array follow a logarithmic periodicity.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |