US4334167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastic surface wave device
Assignee: Faurecia Clarion Electronics Co Ltd
•
Filing: 1980-05-27
•
Granted: 1982-06-08
•
Expires: 2000-05-27
Abstract
Abstract An elastic surface wave device having an input electrode, a pump electrode and an output electrode provided on a body of the device. The output electrode is juxtaposed with the input electrode on the body of the device on the same side with reference to the pump electrode and a multistrip coupler is provided between the pump electrode and the input and output electrodes so as to output, through the output electrode, a backward wave signal from the pump electrode.
Inventors
- 👤 Shoichi Minagawa
- 👤 Takeshi Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:57
CPC Classifications
H; H03; H03F; H03F13/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
83 words
In an elastic surface wave device comprising a body having an input electrode, an output electrode and a pump electrode provided thereon, wherein the improvement comprises: said output electrode is juxtaposed with said input electrode on the same side of said body with reference to said pump electrode and wherein a further electrode for outputting through said output electrode a backward wave signal from said pump electrode is provided at an intermediate position between said input and output electrodes and said pump electrode.
Claim 2
Dependent Claim
83 words
In an elastic surface wave device comprising a body having an input electrode, an output electrode and a pump electrode provided thereon, wherein the improvement comprises: said output electrode is juxtaposed with said input electrode on the same side of said body with reference to said pump electrode and wherein a further electrode for outputting through said output electrode a backward wave signal from said pump electrode is provided at an intermediate position between said input and output electrodes and said pump electrode.
Claim 3
Dependent Claim
24 words
An elastic surface wave device as claimed in claim 1, wherein said further electrode for outputting the backward wave signal is a multi-strip coupler.
Claim 4
Dependent Claim
89 words
An elastic surface wave device as claimed in claim 2, wherein said multi-strip coupler includes a plurality of strip electrodes and the number N of said strip electrodes of said multi-strip coupler is expressed by: ##EQU2## where θ=πα d/λ, λ is a wave length of an elastic surface wave, K 2 is an electromechanical coupling coefficient of the body of the device, d is the periodic repetition spacing between said strip electrodes, and α is an effective coefficient with respect to the periodic repetition spacing between said strip electrodes.
Claim 5
Dependent Claim
49 words
An elastic surface wave device as claimed in claim 2 or 3, wherein said body of the device is formed of a laminate of a semiconductive material layer and a piezoelectric material layer and wherein all said electrodes are arranged on a surface portion of said piezoelectric material layer.
Claim 6
Dependent Claim
25 words
An elastic surface wave device as claimed in claim 2 or 3, wherein said body of the device is made of a piezoelectric semiconductive material.
Claim 7
Dependent Claim
26 words
An elastic surface wave device as claimed in any one of the claims 2 to 4, wherein said input and output electrodes are comb-shaped electrodes, respectively.
Claim 8
Dependent Claim
32 words
An elastic surface wave device as claimed in claim 6, wherein differing spacings are provided between respective teeth of each said comb-shaped electrode in a propagation direction of a surface wave signal.
Claim 9
Dependent Claim
102 words
An elastic surface wave device as claimed in claim 2 or claim 3, wherein a space is provided between said input electrode and said output electrode and wherein the spacing between said strip electrodes of the multi-strip coupler at a portion thereof corresponding to said space between said input electrode and said output electrode differs from the spacing between said strip electrodes of the multi-strip coupler at portions thereof corresponding to said input and output electrodes, so as to form an inoperative region at said portion of said multi-strip coupler corresponding to said space between said input electrode and said output electrode.
Claim 10
Dependent Claim
28 words
An elastic surface wave device as claimed in claim 8, wherein said pump electrode includes first and second electrodes to correspond to said input and output electrodes, respectively.
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) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |