Patent US3873946A successfully refreshed from Google Patents.
US3873946A
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Acoustic surface wave tapped delay line
Assignee: Raytheon Co
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Filing: 1973-10-04
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Granted: 1975-03-25
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Expires: 1993-10-04
Abstract
Abstract An acoustic surface wave device wherein a transducer launches a main beam of acoustic surface wave energy on a substrate of piezoelectric material in a first direction in which the material supports propagating surface wave energy and in which it has a high electromechanical coupling constant, and wherein at least one energy-tapping multistrip coupler is disposed on the substrate with a tapping portion in the path of the propagating beam and with an angularly offset launching portion whereby propagating energy tapped from the main beam is launched in a second direction in which the material supports propagating surface wave energy and in which it also has a relatively high electromechanical coupling constant, such tapped beam energy being intercepted by a receiving transducer disposed on the substrate in the path of the tapped energy launched by the multistrip coupler.
Inventors
- 👤 Rolf D Weglein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:18
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02535; H03H9/02637; H03H9/02685; H03H9/02771; H03H9/30; H03H9/42; H03H9/74; H03H9/76
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
155 words
An acoustic surface wave tapped delay line, comprising: a substrate of piezoelectric material, said material having a coincidence in at least two directions of a relatively high electromechanical coupling constant and collinear group and phase velocities of propagating acoustic surface wave energy; transducer means including at least one electroacoustic transducer disposed on said substrate for launching a main acoustic surface wave energy beam in the plane of said substrate in one of said directions; tapping means including at least one multistrip coupler disposed on said substrate, said coupler having a tapping portion in the path of said beam and having an angularly offset launching portion for propagating in another of said directions energy tapped from said beam; and receiving means including an electroacoustic receiving transducer disposed on said substrate in the path of said propagating energy launched from said angularly offset launching portion of said multistrip coupler for receiving said energy tapped from said beam.
Claim 2
Dependent Claim
155 words
An acoustic surface wave tapped delay line, comprising: a substrate of piezoelectric material, said material having a coincidence in at least two directions of a relatively high electromechanical coupling constant and collinear group and phase velocities of propagating acoustic surface wave energy; transducer means including at least one electroacoustic transducer disposed on said substrate for launching a main acoustic surface wave energy beam in the plane of said substrate in one of said directions; tapping means including at least one multistrip coupler disposed on said substrate, said coupler having a tapping portion in the path of said beam and having an angularly offset launching portion for propagating in another of said directions energy tapped from said beam; and receiving means including an electroacoustic receiving transducer disposed on said substrate in the path of said propagating energy launched from said angularly offset launching portion of said multistrip coupler for receiving said energy tapped from said beam.
Claim 3
Dependent Claim
29 words
The device according to claim 1, also comprising an acoustic energy absorbing element disposed on said substrate in the path of said main beam downstream of said tapping means.
Claim 4
Dependent Claim
14 words
The device according to claim 2, wherein said absorbing element is a viscous matter.
Claim 5
Dependent Claim
20 words
The device according to claim 2, wherein said absorbing element is an ion bombardment-produced high resistivity region on said substrate.
Claim 6
Dependent Claim
32 words
The device according to claim 1, also comprising an acoustic energy absorbing element disposed on said substrate on the side of said launching portion of said multistrip coupler opposite said receiving transducer.
Claim 7
Dependent Claim
45 words
The device according to claim 1, wherein said piezoelectric material is y-cut z-propagating LiNbO3, and wherein said main beam is directed in said z-direction and said energy tapped from said beam propagates in an approximate direction + or - 22* with respect to said z-direction.
Claim 8
Dependent Claim
35 words
The device according to claim 1 wherein said tapping means includes a plurality of said multistrip couplers, successive ones of which are disposed with their offset launching portions on opposite sides of said main beam.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |