US3766496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Feedback-type acoustic surface wave device
Assignee: United States Department of the Navy
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Filing: 1971-02-04
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Granted: 1973-10-16
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Expires: 1991-02-04
Abstract
Abstract A distributed-transducer surface wave device, comprising a crystal substrate, capable of propagating a surface wave, and a pair of transducers disposed in an aligned relationship upon the crystal substrate, including an input and output transducer, each of which includes at least one pair of interdigitated electrodes disposed perpendicularly to the direction of surface wave propagation caused by the application of an input signal to the input transducer. The distance between each pair of adjacent electrodes for each of the transducers is uniform. A feedback loop is connected from the output of the output transducer to the input of the input transducer.
Inventors
- 👤 H Whitehouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:52
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02535; H03H9/02818; H03H9/02834; G; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/195; G11; G11C; G11C21/00; G11C21/02; G11C21/023; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/326; H03B7/00; H03H9/30; H03H9/42
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
161 words
A distributed-transducer acoustic wave device comprising: a crystal substrate capable of propagating a surface wave; at least one transducer set disposed upon the crystal substrate, each transducer set including at least an input transducer adapted to receive an input electrical signal and an output transducer, each input and output transducer including at least a pair of interdigitated electrodes which, upon application of a signal to the input transducer, cause acoustic wave propagation on the surface of the crystal substrate, the electrodes of each transducer of each transducer set being aligned perpendicular to the direction of wave propagation; and a feedback loop connected from the output of the output transducer to the input of the input transducer, for feeding back to the input a voltage having a predetermined magnitude and phase with respect to the input electrical signal; and wherein the interdigitations of the electrodes of at least one of the transducers of at least one of the transducer sets are coded.
Claim 2
Dependent Claim
161 words
A distributed-transducer acoustic wave device comprising: a crystal substrate capable of propagating a surface wave; at least one transducer set disposed upon the crystal substrate, each transducer set including at least an input transducer adapted to receive an input electrical signal and an output transducer, each input and output transducer including at least a pair of interdigitated electrodes which, upon application of a signal to the input transducer, cause acoustic wave propagation on the surface of the crystal substrate, the electrodes of each transducer of each transducer set being aligned perpendicular to the direction of wave propagation; and a feedback loop connected from the output of the output transducer to the input of the input transducer, for feeding back to the input a voltage having a predetermined magnitude and phase with respect to the input electrical signal; and wherein the interdigitations of the electrodes of at least one of the transducers of at least one of the transducer sets are coded.
Claim 3
Dependent Claim
26 words
The acoustic wave device as recited in claim 1, wherein the feedback connection is such as to provide positive feedback from the output to the input.
Claim 4
Dependent Claim
25 words
The acoustic wave device according to claim 1, wherein the feedback connection is such as to provide negative feedback from the output to the input.
Claim 5
Dependent Claim
17 words
The acoustic wave device as recited in claim 1, wherein the substrate consists of a piezoelectric crystal.
Claim 6
Dependent Claim
15 words
The acoustic wave device as recited in claim 4, wherein the piezoelectric crystal is quartz.
Claim 7
Dependent Claim
16 words
The acoustic wave device as recited in claim 1, wherein the code is a Barker code.
Claim 8
Dependent Claim
46 words
The acoustic wave device as recited in claim 1, further comprising: at least one other transducer set disposed upon the crystal substrate, the electrodes of the transducer sets being disposed upon the crystal substrate in a parallel relationship, each transducer set forming an acoustic processing circuit.
Claim 9
Dependent Claim
38 words
The acoustic wave device as recited in claim 7, further comprising: an isolator divider strip disposed upon the substrate between each transducer set; and an absorber stripe disposed upon the substrate at each end of a transducer set.
Claim 10
Dependent Claim
56 words
The acoustic wave device as recited in claim 1, further comprising: an input amplifier connected to the input transducer for impressing an amplified input electrical signal upon the electrodes of the input transducer, the electrical signal being transduced to an acoustic surface wave traversing the surface of the substrate in a direction toward the output transducer.
Claim 11
Dependent Claim
39 words
The acoustic wave device as recited in claim 9, wherein the feedback connection is such that the voltage fed back from the output to the input has a magnitude and phase such that the acoustic wave device generates oscillations.
Claim 12
Dependent Claim
32 words
The acoustic wave device as recited in claim 9, further comprising: an output amplifier connected to the output transducer for amplifying the electrical signal transduced by the electrodes of the output transducer.
Claim 13
Dependent Claim
39 words
The acoustic wave device as recited in claim 11, wherein the feedback connection is such that the voltage fed back from the output to the input has a magnitude and phase such that the acoustic wave device generates oscillations.
Claim 14
Dependent Claim
46 words
The acoustic wave device as recited in claim 12, further comprising: at least one other transducer set disposed upon the crystal substrate, the electrodes of the transducer sets being disposed upon the crystal substrate in a parallel relationship, each transducer set forming an acoustic processing circuit.
Claim 15
Dependent Claim
30 words
The acoustic wave device according to claim 13, serving as a clock source, for clocking the propagation of pulses of the other acoUstic processing circuits disposed on the same substrate.
Claim 16
Dependent Claim
23 words
The acoustic wave device as recited in claim 1, wherein the feedback loop comprises a two-conductor metalization strip disposed upon the same substrate.
Claim 17
Dependent Claim
84 words
A distributed-transducer acoustic wave device comprising: a crystal substrate capable of propagating a surface wave; a transducer disposed upon the crystal substrate, adapted to receive an input electrical signal, and including at least a pair of interdigitated electrodes which, upon application of a signal, cause acoustic wave propagation on the surface of the crystal substrate, the electrodes of the transducer being aligned perpendicular to the direction of wave propagation; and a negative impedance converter connected to the transducer, for generating oscillations in the electrodes.
Claim 18
Dependent Claim
84 words
A distributed-transducer acoustic wave device comprising: a crystal substrate capable of propagating a surface wave; a transducer disposed upon the crystal substrate, adapted to receive an input electrical signal, and including at least a pair of interdigitated electrodes which, upon application of a signal, cause acoustic wave propagation on the surface of the crystal substrate, the electrodes of the transducer being aligned perpendicular to the direction of wave propagation; and a negative impedance converter connected to the transducer, for generating oscillations in the electrodes.
Claim 19
Dependent Claim
41 words
The acoustic wave device according to claim 16, further comprising: another, second, transducer, disposed upon the same substrate, aligned with the first-named transducer in the same direction of wave propagation, capable of detecting the oscillations generated by the negative impedance converter.
Claim 20
Dependent Claim
52 words
The acoustic wave device according to claim 17, further comprising: a third transducer, substantially identical to the first-named transducer, and aligned with the other two transducers in the same direction of wave propagation, the second transducer being disposed between the other two; and a negative impedance converter connected to the third transducer.
Claim 21
Dependent Claim
28 words
The acoustic wave device according to claim 17, further comprising: a clock shaping circuit, connected to the second transducer, for shaping the signals detected by the second transducer.
References Cited (Backward Citations)
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US3582838A
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US3582840A
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US3446975A
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US3568102A
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US3582540A
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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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |