US4006436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface acoustic wave delay lines
Assignee: International Standard Electric Corp
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Filing: 1976-03-26
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Granted: 1977-02-01
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Expires: 1996-03-26
Abstract
Abstract A surface acoustic wave delay line uses a closed loop principle with separate input and output transducers side by side. 3dB Multistrip couplers are introduced to achieve substantially 100% transfer for surface acoustic wave energy from the propagation path associated with the input transducer to the propagation path associated with the output transducer. Several such delay lines can be formed on a single cylindrical body of piezoelectric material and these can then be cascaded with intermediate amplification to form a long delay or a tapped delay.
Inventors
- 👤 John Stuart Heeks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:39
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/30; H03H9/42
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
96 words
A surface acoustic wave delay line comprising; a cylindrical body of piezoelectric material; a pair of separate input and output transducers arranged on the surface of said cylindrical body and adjacent one another on a straight line parallel to the cylindrical axis, said transducers being so oriented that the propagation paths associated therewith are normal to said straight line; and two directional coupler devices each having a predetermined coupling coefficient located on either side of said pair of transducers so as to provide mutual coupling between acoustic waves in both propagation paths associated with said transducers.
Claim 2
Dependent Claim
96 words
A surface acoustic wave delay line comprising; a cylindrical body of piezoelectric material; a pair of separate input and output transducers arranged on the surface of said cylindrical body and adjacent one another on a straight line parallel to the cylindrical axis, said transducers being so oriented that the propagation paths associated therewith are normal to said straight line; and two directional coupler devices each having a predetermined coupling coefficient located on either side of said pair of transducers so as to provide mutual coupling between acoustic waves in both propagation paths associated with said transducers.
Claim 3
Dependent Claim
51 words
A surface acoustic wave delay line according to claim 1 wherein said input and output transducers each comprise two sets of parallel interdigital contact strips formed on the surface of said body, each set being connected to a separate terminal, said strips being parallel to a longitudinal axis of said body.
Claim 4
Dependent Claim
18 words
A surface acoustic wave delay line according to claim 2 wherein said cylindrical body has a circular cross-section.
Claim 5
Dependent Claim
18 words
A surface acoustic wave delay line according to claim 2 wherein said cylindrical body has an oval cross-section.
Claim 6
Dependent Claim
18 words
A surface acoustic wave delay line according to claim 2 wherein said cylindrical body has an elliptical cross-section.
Claim 7
Dependent Claim
22 words
A surface acoustic wave delay line according to claim 2 wherein said directional coupler devices each have a 3 dB coupling coefficient.
Claim 8
Dependent Claim
113 words
A surface acoustic wave delay line comprising: a cylindrical body of piezoelectric material; a plurality of pairs of separate input and output transducers arranged on the surface of said cylindrical body, the transducers of each pair being adjacent one another on a straight line parallel to the cylindrical axis and so oriented that the propagation paths associated therewith are normal to said straight line; and a pair of directional coupler devices having a predetermined coupling coefficient associated with each pair of transducers, the couplers being located on either side of said pair of transducers so as to provide mutual coupling between acoustic waves in both propagation paths associated with the pair of transducers.
Claim 9
Dependent Claim
113 words
A surface acoustic wave delay line comprising: a cylindrical body of piezoelectric material; a plurality of pairs of separate input and output transducers arranged on the surface of said cylindrical body, the transducers of each pair being adjacent one another on a straight line parallel to the cylindrical axis and so oriented that the propagation paths associated therewith are normal to said straight line; and a pair of directional coupler devices having a predetermined coupling coefficient associated with each pair of transducers, the couplers being located on either side of said pair of transducers so as to provide mutual coupling between acoustic waves in both propagation paths associated with the pair of transducers.
Claim 10
Dependent Claim
49 words
A surface acoustic wave delay line according to claim 7 wherein said input and output transducers each comprise two sets of parallel interdigital contact strips formed on said body, each set being connected to a separate terminal and the strips being parallel to a longitudinal axis of said body.
Claim 11
Dependent Claim
50 words
A surface acoustic wave delay line according to claim 8 wherein said directional coupler devices each comprise a plurality of parallel contact strips formed on said body, said strips of each coupler device extending in length to traverse the propagation paths associated with one pair of input and output transducers.
Claim 12
Dependent Claim
18 words
A surface acoustic wave delay line according to claim 9 wherein said cylindrical body has a circular cross-section.
Claim 13
Dependent Claim
18 words
A surface acoustic wave delay line according to claim 9 wherein said cylindrical body has an oval cross-section.
Claim 14
Dependent Claim
18 words
A surface acoustic wave delay line according to claim 9 wherein said cylindrical body has an elliptical cross-section.
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) | 1980-02-01 | 1980-08-02 | 1981-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-01 | 1984-08-02 | 1985-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-01 | 1988-08-02 | 1989-02-01 | $7700.00 | Window Closed / Lapsed |