US3757256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface wave transducers with cancellation of secondary response
Assignee: United States Department of the Navy
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Filing: 1971-08-02
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Granted: 1973-09-04
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Expires: 1991-08-02
Abstract
Abstract A surface wave device having a desired impulse response, comprising a substrate capable of propagating surface waves, and an input, or launch, transducer pair, each transducer being disposed upon the substrate in a parallel relationship, and each transducer including a pair of sets of parallel, linear, interdigitated, electrode elements, each set of elements being connected to a common bus bar. One transducer of the input transducer pair has its parallel elements weighted in accordance with an arbitrary weighting function w1(x), while the other transducer of the input transducer pair has its parallel elements weighted in accordance with the function w2(x), the two functions being related by
Inventors
- 👤 H Whitehouse
- 👤 J Speiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:09
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/64; H03H9/6489; G; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/195; H03H9/02; H03H9/02535; H03H9/02818; H03H9/125; H03H9/145; H03H9/14544; H03H9/1455
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
170 words
A surface wave device having a desired impulse response, comprising: a substrate capable of propagating surface waves; an input, or launch, transducer pair, connected in parallel, each transducer being disposed upon the substrate in a parallel relationship, and each transducer including a pair of sets of parallel, linear, interdigitated, electrode elements, each sets of elements being connected to a common bus bar; an output, or receive, transducer, aligned in the same propagation path with one of the input transducers, also comprising a pair of sets of parallel, linear, interdigitated, electrode elements, each set of elements being connected to a common bus bar; and acoustic absorbers, disposed on the substrate, parallel to the elements of the transducers and between the transducers and the edges of the substrate; the pair of input transducers so configured one with respect to the other that, with an input electrical signal applied to the bus bars, the effects of multiple conversions of electrical energy to acoustic energy and vice versa are diminished, even on high-coupling substrates.
Claim 2
Dependent Claim
170 words
A surface wave device having a desired impulse response, comprising: a substrate capable of propagating surface waves; an input, or launch, transducer pair, connected in parallel, each transducer being disposed upon the substrate in a parallel relationship, and each transducer including a pair of sets of parallel, linear, interdigitated, electrode elements, each sets of elements being connected to a common bus bar; an output, or receive, transducer, aligned in the same propagation path with one of the input transducers, also comprising a pair of sets of parallel, linear, interdigitated, electrode elements, each set of elements being connected to a common bus bar; and acoustic absorbers, disposed on the substrate, parallel to the elements of the transducers and between the transducers and the edges of the substrate; the pair of input transducers so configured one with respect to the other that, with an input electrical signal applied to the bus bars, the effects of multiple conversions of electrical energy to acoustic energy and vice versa are diminished, even on high-coupling substrates.
Claim 3
Dependent Claim
72 words
A surface wave device according to claim 1 wherein one transducer of the input transducer pair has its parallel elements weighted in accordance with an arbitrary weighting function w1(x); the other transducer of the input transducer pair has its parallel elements weighted in accordance with the function w2(x), the functions being related by the function, W1(f) 2 W2(f) 2 a constant, where WI, W2, are the Fourier transforms of w1, w2, respectively.
Claim 4
Dependent Claim
30 words
A surface wave device according to claim 2, wherein the interdigitated electrodes of the input transducers are weighted according to the configurations of the members of a Golay complementary pair.
Claim 5
Dependent Claim
18 words
A surface wave device according to claim 2, wherein the output transducer comprises several uniformly coded electrode elements.
Claim 6
Dependent Claim
26 words
A surface wave device according to claim 3, wherein the output transducer comprises a pair of transducers substantially identical to and aligned with the input transducers.
Claim 7
Dependent Claim
39 words
A surface wave device according to claim 2, wherein the interdigitated electrodes of the input transducers are weighted according to a chirp code for one of the transducers and the complement of the chirp code for the other transducer.
Claim 8
Dependent Claim
24 words
A surface wave device according to claim 2, wherein the interdigitated electrodes of the input transducers are weighted in accordance with a Huffman code.
Claim 9
Dependent Claim
24 words
A surface wave device according to claim 2, wherein the interdigitated electrodes of the input transducers are weighted in accordance with a Barker code.
Claim 10
Dependent Claim
29 words
A surface wave device according to claim 1, wherein the two input transducers are identical; and further comprising: a gyrator interposed between the inputs to the two launch transducers.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |