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US3723916A
Expired / Lapsed
US
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Surface wave multiplex transducer device with gain and side lobe suppression
Assignee: United States Department of the Navy
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Filing: 1971-10-01
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Granted: 1973-03-27
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Expires: 1991-10-01
Abstract
Abstract A surface wave multiplex transducer device, having N propagation paths, comprising a substrate and N-n composite launch vertical stacks of transducers, where N >/= 3 and O </= n </= N - 1, each stack consisting of N transducers whose inputs are connected together, disposed upon the substrate in a parallel relationship and capable of transmitting N parallel surface waves across the substrate. Included are N-n composite receiving vertical stacks of transducers, each stack consisting of N transducers whose outputs are connected together, the j-th receiving stack being identical to the corresponding j-th launch stack, the receiving vertical stacks being disposed upon the substrate in a parallel relationship to the launch vertical stacks of transducers, so as to receive the N parallel launched surface waves. The (N-n)N launch and the (N-n)N receiving stacks of transducers are so coded that the response of the j-th receiving stack to an impulse applied to the k-th launch stack is an impulse if the numbers j and k are equal and zero if j and k are unequal.
Inventors
- 👤 J Speiser
- 👤 H Whitehouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:56
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/125; H03H9/145; H03H9/14544; H03H9/1455; H03H9/02535; H03H9/02818; H03H9/02905; H03H9/30; H03H9/42
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
182 words
A surface wave multiplex transducer device, having N propagation paths, and capable of propagating N distinct signals, comprising: a substrate; N-n composite launch vertical stacks of transducers, where N > OR = 3 and 0 < OR = n < OR = N-1, each stack consisting of N transducers whose inputs are connected together, disposed upon the substrate in a parallel relationship and capable of transmitting N parallel surface waves across the substrate; N-n composite receiving vertical stacks of transducers, each stack consisting of N transducers whose outputs are connected together, the j-th receiving stack being identical to the corresponding j-th launch stack, the receiving vertical stacks being disposed upon the substrate in a parallel relationship to the launch vertical stacks of transducers, so as to receive the N parallel launched surface waves; the (N-n)N launch and the (N-n)N receiving stacks of transducers being so coded that the response of the j-th receiving stack to an impulse applied to the k-th launch stack is an impulse if the numbers j and k are equal and zero if j and k are unequal.
Claim 2
Dependent Claim
182 words
A surface wave multiplex transducer device, having N propagation paths, and capable of propagating N distinct signals, comprising: a substrate; N-n composite launch vertical stacks of transducers, where N > OR = 3 and 0 < OR = n < OR = N-1, each stack consisting of N transducers whose inputs are connected together, disposed upon the substrate in a parallel relationship and capable of transmitting N parallel surface waves across the substrate; N-n composite receiving vertical stacks of transducers, each stack consisting of N transducers whose outputs are connected together, the j-th receiving stack being identical to the corresponding j-th launch stack, the receiving vertical stacks being disposed upon the substrate in a parallel relationship to the launch vertical stacks of transducers, so as to receive the N parallel launched surface waves; the (N-n)N launch and the (N-n)N receiving stacks of transducers being so coded that the response of the j-th receiving stack to an impulse applied to the k-th launch stack is an impulse if the numbers j and k are equal and zero if j and k are unequal.
Claim 3
Dependent Claim
20 words
A multiplex transducer according to claim 1, wherein the transducers are interdigitated and include a field-delineating electrode between the interdigitations.
Claim 4
Dependent Claim
31 words
A multiplex transducer device according to claim 2, wherein the (N-n)N launch transducers and (N-n)N receiving transducers are simple, one-element, transducers configured to correspond to the elements of an orthogonal matrix.
Claim 5
Dependent Claim
16 words
A multiplex transducer device according to claim 3, wherein the orthogonal matrix is a Hadamard matrix.
Claim 6
Dependent Claim
92 words
A multiplex transducer device according to claim 3, wherein one of the sets of vertical stacks of transducers, either the (N-n)N launch stacks or the (N-n)N receive stacks, comprises transducers which are configured according to the N components of a set of independent basis vectors; and the other of the sets of vertical stacks of transducers, either the (N-n)N receive stacks or the (N-n)N launch stacks, comprises transducers which are configured according to the N components of a set of basis vectors which are reciprocal to the first-named set of basis vectors.
Claim 7
Dependent Claim
41 words
A multiplex transducer device according to claim 2, wherein each transducer is a composite, or non-simple, transducer, the relative weightings of whose interdigitated electrodes are obtained by taking the Kronecker product of the orthogonal matrix and each column of the matrix.
Claim 8
Dependent Claim
33 words
A multiplex transducer device according to claim 3, wherein n equals zero, and there are therefore N vertical stacks of launch and N vertical stacks of receive transducers, each stack containing N transducers.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |