Patent US4097825A successfully refreshed from Google Patents.
US4097825A
Expired / Lapsed
US
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Surface acoustic wave tapped delay line
Assignee: Raytheon Co
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Filing: 1977-01-05
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Granted: 1978-06-27
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Expires: 1997-01-05
Abstract
Abstract A surface acoustic wave device having spaced tapping output transducers disposed in the path of surface acoustic wave energy propagating along a planar substrate surface from an input transducer. The device including an ion-etched groove array disposed in the planar surface between the tapping transducers to reduce acoustic wave reflections at desired frequencies within a desired passband and suppress spurious signal-producing surface acoustic wave reflections.
Inventors
- 👤 Henry M. Gerard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:02
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02535; H03H9/02818; H03H9/02842; H03H9/30; H03H9/42
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
122 words
A surface acoustic wave tapped delay line, comprising: a. a substrate of material having a planar surface capable of supporting propagating surface acoustic wave energy; b. input means including an input transducer disposed on said substrate surface for launching surface acoustic wave energy along a propagation path in response to an electrical input signal; c. tapping means, including at least two spaced double electrode tapping transducers, disposed on said surface in said propagation path each for extracting a selected portion of said propagating surface acoustic wave energy; and d. suppression means, including a grooved element array disposed in said surface between said tapping transducers, for reducing acoustic wave reflections at desired frequencies within a desired passband and suppressing spurious signals produced thereby.
Claim 2
Dependent Claim
122 words
A surface acoustic wave tapped delay line, comprising: a. a substrate of material having a planar surface capable of supporting propagating surface acoustic wave energy; b. input means including an input transducer disposed on said substrate surface for launching surface acoustic wave energy along a propagation path in response to an electrical input signal; c. tapping means, including at least two spaced double electrode tapping transducers, disposed on said surface in said propagation path each for extracting a selected portion of said propagating surface acoustic wave energy; and d. suppression means, including a grooved element array disposed in said surface between said tapping transducers, for reducing acoustic wave reflections at desired frequencies within a desired passband and suppressing spurious signals produced thereby.
Claim 3
Dependent Claim
28 words
The surface wave tapped delay line according to clam 1, wherein said grooves are spaced one-quarter acoustic wavelength apart to cancel reflections from individual ones of said grooves.
Claim 4
Dependent Claim
28 words
The surface wave tapped delay line according to clam 1, wherein said grooves are spaced one-quarter acoustic wavelength apart to cancel reflections from individual ones of said grooves.
Claim 5
Dependent Claim
42 words
The surface acoustic wave delay line according to claim 1, wherein said grooves are one-eighth acoustic wavelength wide and the spacing between outermost ones of said grooves and adjacent outermost ones of the electrodes of said tapping transducers is one-half acoustic wavelength.
Claim 6
Dependent Claim
27 words
The surface acoustic wave delay line according to claim 1, wherein the depth of said grooves below said substrate surface is approximately 21/2% of said acoustic wavelength.
Claim 7
Dependent Claim
16 words
The surface acoustic wave tapped delay line according to claim 1, wherein said grooves are ion-etched.
References Cited (Backward Citations)
US3983517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |