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US3573669A
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Dispersive delay cell using anisotropic medium
Assignee: AT&T Inc
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Filing: 1968-09-03
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Granted: 1971-04-06
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Expires: 1988-09-03
Abstract
Abstract An elastic wave dispersive delay cell which uses a cell body of an elastically anisotropic delay medium and a pair of spaced transducer arrays disposed on opposing parallel surfaces of the body to achieve nonlinear dispersion.
Inventors
- 👤 Emmanuel P Papadakis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:31
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/30; H03H9/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
100 words
A dispersive delay cell comprising: a body of an anisotropic elastic wave supporting medium characterized in that said medium has a symmetry axis such that elastic shear waves polarized along the direction of said axis propagate in any plane normal to the axis in a pure mode having a phase velocity which varies with the propagation direction in the normal plane; means for launching elastic shear waves polarized along said axis into said body in several directions in the normal plane, depending on the frequency of the waves; and means for receiving said shear waves elastically coupled to said body.
Claim 2
Dependent Claim
100 words
A dispersive delay cell comprising: a body of an anisotropic elastic wave supporting medium characterized in that said medium has a symmetry axis such that elastic shear waves polarized along the direction of said axis propagate in any plane normal to the axis in a pure mode having a phase velocity which varies with the propagation direction in the normal plane; means for launching elastic shear waves polarized along said axis into said body in several directions in the normal plane, depending on the frequency of the waves; and means for receiving said shear waves elastically coupled to said body.
Claim 3
Dependent Claim
21 words
A delay cell according to claim 1 wherein; said means for launching elastic shear waves is a spaced array of transducers.
Claim 4
Dependent Claim
22 words
A delay cell according to claim 1 wherein; said means for launching elastic shear waves is a uniformly spaced array of transducers.
Claim 5
Dependent Claim
58 words
A delay cell according to claim 1 wherein: said body of anisotropic elastic wave supporting medium has a pair of parallel surfaces which are parallel to said symmetry axis; and wherein each of the means for launching and for receiving elastic shear waves comprises a uniformly spaced array of transducers disposed on different ones of said parallel surfaces.
Claim 6
Dependent Claim
43 words
A delay cell according to claim 1 wherein: said body of anisotropic elastic wave supporting medium is a pure single cubic crystal; and said means for launching elastic shear waves launches a shear wave polarized in the (110) direction in said cubic crystal.
Claim 7
Dependent Claim
13 words
A delay cell according to claim 4 wherein said medium is monocrystalline silicon.
Claim 8
Dependent Claim
43 words
A delay cell according to claim 1 wherein: said body of anisotropic elastic wave supporting medium is a pure single hexagonal crystal; and said means for launching elastic shear waves launches a shear wave polarized along the a -axis of said hexagonal crystaL.
Claim 9
Dependent Claim
13 words
A delay cell according to claim 4 wherein said medium is monocrystalline quartz.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |