Patent US4879562A successfully refreshed from Google Patents.
US4879562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slotted microstrip antenna with ferrite coating
Assignee: United States Department of the Army
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Filing: 1989-01-09
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Granted: 1989-11-07
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Expires: 2009-01-09
Abstract
Abstract A microstrip antenna is improved by applying a thin coating of ferrite maial to the surface of the metal ground plane of the antenna by flame spraying or arc plasma spraying. The applied ferrite coating is not exposed to a high temperature anneal cycle.
Inventors
- 👤 Richard A. Stern
- 👤 Richard W. Babbitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:07
CPC Classifications
H; H01; H01Q; H01Q17/00; H01Q17/004
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
102 words
In a microstrip antenna including a bottom microstrip circuit including an array of microstrip lines of a conductive metal, a dielectric layer in contact with and overlying said microstrip circuit, and a metal ground plane in contact with and overlying said dielectric layer wherein said ground plane includes a metallic surface with rows of radiating slots etched through the metallic surface such that each row of slots overlies a particular microstrip line in said bottom microstrip circuit, the improvement of applying a thin coating of ferrite material to the surface of the metal ground plane not in contact with the dielectric layer.
Claim 2
Dependent Claim
102 words
In a microstrip antenna including a bottom microstrip circuit including an array of microstrip lines of a conductive metal, a dielectric layer in contact with and overlying said microstrip circuit, and a metal ground plane in contact with and overlying said dielectric layer wherein said ground plane includes a metallic surface with rows of radiating slots etched through the metallic surface such that each row of slots overlies a particular microstrip line in said bottom microstrip circuit, the improvement of applying a thin coating of ferrite material to the surface of the metal ground plane not in contact with the dielectric layer.
Claim 3
Dependent Claim
17 words
A microstrip antenna according to claim 1 whrein the ferrite coating is applied by arc plasma spraying.
Claim 4
Dependent Claim
16 words
A microstrip antenna according to claim 1 wherein the ferrite coating is applied by flame spraying.
Claim 5
Dependent Claim
19 words
A microstrip antenna according to claim 2 wherein the radiating slots are masked prior to applying the ferrite coating.
Claim 6
Dependent Claim
19 words
A microstrip antenna according to claim 3 wherein the radiating slots are masked prior to applying the ferrite coating.
Claim 7
Dependent Claim
21 words
A microstrip antenna according to claim 4 wherein the applied ferrite coating is not exposed to a high temperature anneal cycle.
Claim 8
Dependent Claim
21 words
A microstrip antenna according to claim 5 wherein the applied ferrite coating is not exposed to a high temperature anneal cycle.
Claim 9
Dependent Claim
20 words
A microstrip antenna according to claim 6 wherein terminating ends of the bottom microstrip circuit are oversprayed with ferrite material.
Claim 10
Dependent Claim
20 words
A microstrip antenna according to claim 7 wherein terminating ends of the bottom microstrip circuit are oversprayed with ferrite material.
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) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |