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US3716809A
Expired / Lapsed
US
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Acoustic surface wave resonator
Assignee: United States Department of the Air Force
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Filing: 1971-08-11
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Granted: 1973-02-13
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Expires: 1991-08-11
Abstract
Abstract High Q performance is achieved in an acoustic surface wave resonator by the use of acoustic surface wave reflectors. The resonator input transducer and the reflectors are affixed to the propagation surface of a piezoelectric substrate member by photolithographic process. The input transducer is an interdigital structure having many long interleaving finger members. The reflectors also have long interleaving finger members and are positioned in close parallel relationship to the transducer finger members. The reflectors are electrically terminated by inductances.
Inventors
- 👤 T Reeder
- 👤 R Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:08
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/25
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
201 words
An acoustic surface wave resonator comprising: a substrate member of piezoelectric material having a propagation surface adapted to permit the propagation of acoustic surface waves therealong, a first electrode disposed on said propagation surface consisting of a terminal pad having a multiplicity of parallel elongated strip members extending therefrom, a second electrode consisting of a terminal pad having a multiplicity of parallel elongated strip members extending therefrom disposed on said propagation surface and having its strip members in interleaves relationship with the centrally disposed portion oF the first electrode strip members, a first acoustic surface wave reflector consisting of a terminal pad having a multiplicity of elongated strip members extending therefrom disposed on said propagation surface and having its strip members in interleaved relationship within one outwardly disposed portion of the first electrode strip members, a second acoustic surface wave reflector consisting of a terminal pad having a multiplicity of elongated strip members extending therefrom disposed on said propagation surface and having its strip members in interleaved relationships with the other outwardly disposed portion of the first electrode strip members, first inductance means connected between the first reflector terminal pads; and second inductance means connected between the second reflector terminal pads.
Claim 2
Dependent Claim
201 words
An acoustic surface wave resonator comprising: a substrate member of piezoelectric material having a propagation surface adapted to permit the propagation of acoustic surface waves therealong, a first electrode disposed on said propagation surface consisting of a terminal pad having a multiplicity of parallel elongated strip members extending therefrom, a second electrode consisting of a terminal pad having a multiplicity of parallel elongated strip members extending therefrom disposed on said propagation surface and having its strip members in interleaves relationship with the centrally disposed portion oF the first electrode strip members, a first acoustic surface wave reflector consisting of a terminal pad having a multiplicity of elongated strip members extending therefrom disposed on said propagation surface and having its strip members in interleaved relationship within one outwardly disposed portion of the first electrode strip members, a second acoustic surface wave reflector consisting of a terminal pad having a multiplicity of elongated strip members extending therefrom disposed on said propagation surface and having its strip members in interleaved relationships with the other outwardly disposed portion of the first electrode strip members, first inductance means connected between the first reflector terminal pads; and second inductance means connected between the second reflector terminal pads.
References Cited (Backward Citations)
US3568102A
Cited
US3596211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |