US3873858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic surface wave phase shifter
Assignee: Massachusetts Institute of Technology
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Filing: 1972-05-23
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Granted: 1975-03-25
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Expires: 1992-05-23
Abstract
Abstract An acoustic surface wave phase shifter including a piezoelectric medium for propagating a surface wave and a conducting device disposed proximate a surface of the piezoelectric medium on which a surface wave propagates, and means for controlling the interaction of the conducting device with the electric field associated with a surface wave for shifting the phase of a surface wave.
Inventors
- 👤 Barry Ernest Burke
- 👤 Ernest Stern
- 👤 Abraham Bers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:29
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/36; H; H03; H03H; H03H9/00; H03H9/66; H03H9/68
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
125 words
An acoustic surface wave phase shifter comprising: a first piezoelectric medium for propagating a surface wave; a second piezoelectric medium proximate a surface of said first piezoelectric medium on which a surface wave propagates; a conductor layer on a portion of said second piezoelectric medium proximate the surface of said first piezoelectric medium on which a surface wave propagates; means for mounting said second piezoelectric medium in fixed relation to said first piezoelectric medium; and means for applying an electric field across said second piezoelectric medium to produce a strain in said second piezoelectric medium which changes a dimension of that second piezoelectric medium and changes the distance between said conductor layer and said first piezoelectric medium for shifting the phase of a surface wave.
Claim 2
Dependent Claim
125 words
An acoustic surface wave phase shifter comprising: a first piezoelectric medium for propagating a surface wave; a second piezoelectric medium proximate a surface of said first piezoelectric medium on which a surface wave propagates; a conductor layer on a portion of said second piezoelectric medium proximate the surface of said first piezoelectric medium on which a surface wave propagates; means for mounting said second piezoelectric medium in fixed relation to said first piezoelectric medium; and means for applying an electric field across said second piezoelectric medium to produce a strain in said second piezoelectric medium which changes a dimension of that second piezoelectric medium and changes the distance between said conductor layer and said first piezoelectric medium for shifting the phase of a surface wave.
Claim 3
Dependent Claim
23 words
The surface wave phase shifter of claim 1 in which said conductor layer and said second piezoelectric medium are spaced from each other.
Claim 4
Dependent Claim
29 words
The acoustic surface wave phase shifter of claim 2 in which said conductor layer and said second piezoelectric medium are spaced by a distance of less than one wavelength.
Claim 5
Dependent Claim
22 words
The acoustic surface wave phase shifter of claim 1 in which said means for applying an electric field includes said conductor layer.
Claim 6
Dependent Claim
19 words
The acoustic surface wave phase shifter of claim 1 in which said second piezoelectric medium is a ferroelectric substance.
Claim 7
Dependent Claim
19 words
The acoustic surface wave phase shifter of claim 5 in which said second piezoelectric medium is lead zirconate titanate.
Claim 8
Dependent Claim
25 words
The acoustic surface wave phase shifter of claim 5 in which said means for mounting and said first medium are substances having high dielectric constants.
Claim 9
Dependent Claim
19 words
The acoustic surface wave phase shifter of claim 7 in which said means for mounting is lead zirconate titanate.
Claim 10
Dependent Claim
18 words
The acoustic surface wave phase shifter of claim 1 in which said means for mounting is fuzed quartz.
Claim 11
Dependent Claim
18 words
The acoustic surface wave phase shifter of claim 1 in which said first piezoelectric medium is lithium niobate.
Claim 12
Dependent Claim
130 words
A remanent acoustic surface wave phase shifter comprising: a first piezoelectric medium for propagating an acoustic surface wave; a second ferroelectric piezoelectric medium proximate a surface of said first piezoelectric medium on which an acoustic surface wave propagates; a conductor layer on a portion of said second piezoelectric medium proximate the surface of said first piezoelectric medium on which an acoustic surface wave propagates; means for mounting said second piezoelectric medium in fixed relation to said first piezoelectric medium; and means for applying an electric field across said second piezoelectric medium to produce a strain in said second piezoelectric medium which changes a dimension of that second piezoelectric medium and changes the distance between said conductor layer and said first piezoelectric medium for shifting a phase of the surface wave.
Claim 13
Dependent Claim
130 words
A remanent acoustic surface wave phase shifter comprising: a first piezoelectric medium for propagating an acoustic surface wave; a second ferroelectric piezoelectric medium proximate a surface of said first piezoelectric medium on which an acoustic surface wave propagates; a conductor layer on a portion of said second piezoelectric medium proximate the surface of said first piezoelectric medium on which an acoustic surface wave propagates; means for mounting said second piezoelectric medium in fixed relation to said first piezoelectric medium; and means for applying an electric field across said second piezoelectric medium to produce a strain in said second piezoelectric medium which changes a dimension of that second piezoelectric medium and changes the distance between said conductor layer and said first piezoelectric medium for shifting a phase of the surface wave.
Claim 14
Dependent Claim
24 words
The remanent acoustic surface wave phase shifter of claim 11 in which said first medium and said means for mounting have high dielectric constants.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |