US4395686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Attenuation of higher order width modes in magnetostatic wave devices
Assignee: Westinghouse Electric Corp
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Filing: 1981-10-02
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Granted: 1983-07-26
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Expires: 2001-10-02
Abstract
Abstract A magnetostatic wave device is described incorporating a plurality of resistive strips spaced apart from one another and transverse to the propagation path of magnetostatic waves in a material such as a YIG film having a finite width for attenuating selected higher order modes of propagating magnetostatic waves.
Inventors
- 👤 John D. Adam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:02
CPC Classifications
H; H03; H03H; H03H2/00; H03H2/001
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
105 words
A magnetostatic wave device operable with microwave signals and operable within a biasing magnetic field, comprising: material suitable for propagating magnetostatic waves in a first direction and having a finite width transverse to said first direction; a first and second transducer located in spaced apart relationship in association with said material for generating and receiving magnetostatic waves along a propagation path therebetween in said first direction; and a plurality of resistive strips spaced apart from one another and positioned above said material and transverse to said propagation path for attenuating selected modes of propagating magnetostatic waves occurring due to said finite width of said material.
Claim 2
Dependent Claim
105 words
A magnetostatic wave device operable with microwave signals and operable within a biasing magnetic field, comprising: material suitable for propagating magnetostatic waves in a first direction and having a finite width transverse to said first direction; a first and second transducer located in spaced apart relationship in association with said material for generating and receiving magnetostatic waves along a propagation path therebetween in said first direction; and a plurality of resistive strips spaced apart from one another and positioned above said material and transverse to said propagation path for attenuating selected modes of propagating magnetostatic waves occurring due to said finite width of said material.
Claim 3
Dependent Claim
45 words
A mode filter for attenuating selected higher order modes in a magnetostatic wave device utilizing a suitable material for propagating magnetostatic waves along a path comprising: a plurality of resistive strips spaced apart from one another and positioned on said material transverse to said path.
Claim 4
Dependent Claim
45 words
A mode filter for attenuating selected higher order modes in a magnetostatic wave device utilizing a suitable material for propagating magnetostatic waves along a path comprising: a plurality of resistive strips spaced apart from one another and positioned on said material transverse to said path.
Claim 5
Dependent Claim
28 words
The magnetostatic wave device of claim 1 or 2 wherein said plurality of resistive strips include aluminum having a thickness in the range from 10 to 400 Angstroms.
Claim 6
Dependent Claim
21 words
The magnetostatic wave device of claim 1 or 2 wherein said plurality of resistive strips are positioned parallel to one another.
Claim 7
Dependent Claim
23 words
The magnetostatic wave device of claim 1 or 2 wherein said resistive strips are spaced apart from one another by a predetermined distance.
Claim 8
Dependent Claim
21 words
The magnetostatic wave device of claim 1 or 2 wherein said resistive strips are rectangular in shape having a predetermined length.
Claim 9
Dependent Claim
21 words
The magnetostatic wave device of claim 1 or 2 wherein said resistive strips are rectangular in shape having a predetermined width.
Claim 10
Dependent Claim
26 words
The magnetostatic wave device of claim 1 or 2 wherein at least one of said resistive strips has a plurality of segments colinear to one another.
Claim 11
Dependent Claim
29 words
The magnetostatic wave device of claim 1 or 2 wherein at least one of said resistive strips has a plurality of segments of equal length colinear to one another.
Claim 12
Dependent Claim
23 words
The magnetostatic wave device of claim 1 or 2 wherein said plurality of resistive strips extend across the entire width of said material.
Claim 13
Dependent Claim
25 words
The magnetostatic wave device of claim 1 or 2 wherein said plurality of resistive strips each have a resistivity of at least 1 ohm/square centimeter.
Claim 14
Dependent Claim
16 words
The magnetostatic wave device of claim 1 or 2 wherein said material is yttrium iron garnet.
Claim 15
Dependent Claim
17 words
The magnetostatic wave device of claim 1 or 2 wherein said plurality of resistive strips include chromium.
Claim 16
Dependent Claim
77 words
Apparatus for delaying microwave signals comprising: a substrate of gadolinium gallium garnet having a first surface; a film of yttrium iron garnet deposited on said first surface; first means for generating magnetostatic waves in said film in response to said microwave signals; second means for converting magnetostatic waves propagating in said film to microwave signals; and, third means for attenuating magnetostatic waves of higher order modes traveling transverse to the direction between said first and second means.
Claim 17
Dependent Claim
77 words
Apparatus for delaying microwave signals comprising: a substrate of gadolinium gallium garnet having a first surface; a film of yttrium iron garnet deposited on said first surface; first means for generating magnetostatic waves in said film in response to said microwave signals; second means for converting magnetostatic waves propagating in said film to microwave signals; and, third means for attenuating magnetostatic waves of higher order modes traveling transverse to the direction between said first and second means.
Claim 18
Dependent Claim
34 words
The apparatus of claim 14 wherein said third means for attenuating include conductive electrodes spaced apart from one another and positioned on said film transverse to the direction between said first and second means.
Claim 19
Dependent Claim
26 words
The apparatus of claim 15 wherein said conductive electrodes have a first and second end and have a predetermined resistance from its first to second end.
Claim 20
Dependent Claim
29 words
The apparatus of claim 14 wherein said third means for attenuating include a transverse grating formed longitudinally on the surface of said film intermediate said first and second means.
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) | 1986-07-25 | 1987-01-24 | 1987-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-25 | 1991-01-24 | 1991-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-25 | 1995-01-24 | 1995-07-26 | $7700.00 | Window Closed / Lapsed |