US5528249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-ice radome
Assignee: Lockheed Martin Corp
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Filing: 1992-12-09
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Granted: 1996-06-18
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Expires: 2012-12-09
Abstract
Abstract An anti-ice radome having a frequency selective surface and a plurality of resistive heating elements is disclosed. The frequency selective surface prevents the resistive heating elements from disturbing the electromagnetic waves generated by an antenna within the radome. Thus, ice formation on the radome can be prevented without sacrificing the transmission characteristics of the radome.
Inventors
- 👤 George Gafford
- 👤 Paul H. Gebert
- 👤 Walter S. Arceneaux
- 👤 Rickey D. Akins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:14
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/42; H01Q1/425; H01Q1/02
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
110 words
A radome comprising: an insulating layer; a frequency selective layer disposed on a first side of said insulating layer, having a plurality of openings formed therein in first rows which are spaced from one another by gaps; a plurality of resistive elements formed integrally and defined as a conductive layer on a second, opposite side of said insulating layer, said resistive elements being formed in second rows such that said resistive elements define projections when said second rows are projected onto said frequency selective layer, at least some projections of said second rows lie in said gaps; and current passing means for passing current through said plurality of resistive elements.
Claim 2
Dependent Claim
110 words
A radome comprising: an insulating layer; a frequency selective layer disposed on a first side of said insulating layer, having a plurality of openings formed therein in first rows which are spaced from one another by gaps; a plurality of resistive elements formed integrally and defined as a conductive layer on a second, opposite side of said insulating layer, said resistive elements being formed in second rows such that said resistive elements define projections when said second rows are projected onto said frequency selective layer, at least some projections of said second rows lie in said gaps; and current passing means for passing current through said plurality of resistive elements.
Claim 3
Dependent Claim
27 words
The radome of claim 1, wherein said plurality of resistive elements are formed in said conductive layer at a depth of about 5-10 mils from said openings.
Claim 4
Dependent Claim
126 words
A radome comprising: an insulating layer; a frequency selective layer disposed on a first side of said insulating layer, having a plurality of openings formed therein in first rows which are spaced from one another by gaps; a plurality of resistive elements formed on a second, opposite side of said insulating layer, said resistive elements being formed in second rows such that said resistive elements define projections when said second rows are projected onto said frequency selective layer, at least some projections of said second rows lie in said gaps, wherein said plurality of resistive elements are wires that are embedded in a conductive layer that comprises one of copper, nichrome, or aluminum; and current passing means for passing current through said plurality of resistive elements.
Claim 5
Dependent Claim
126 words
A radome comprising: an insulating layer; a frequency selective layer disposed on a first side of said insulating layer, having a plurality of openings formed therein in first rows which are spaced from one another by gaps; a plurality of resistive elements formed on a second, opposite side of said insulating layer, said resistive elements being formed in second rows such that said resistive elements define projections when said second rows are projected onto said frequency selective layer, at least some projections of said second rows lie in said gaps, wherein said plurality of resistive elements are wires that are embedded in a conductive layer that comprises one of copper, nichrome, or aluminum; and current passing means for passing current through said plurality of resistive elements.
Claim 6
Dependent Claim
27 words
The radome of claim 3, wherein said plurality of resistive elements are embedded in said conductive layer at a depth of about 5-10 mils from said openings.
Claim 7
Dependent Claim
33 words
The radome according to claim 1, wherein said plurality of openings comprise a plurality of cross-shaped openings spaced at periodic intervals based on at least one operating frequency on said frequency selective layer.
Claim 8
Dependent Claim
17 words
The radome of claim 1, further comprising at least one dielectric layer adjacent said frequency selective layer.
Claim 9
Dependent Claim
13 words
The radome of claim 1, wherein said conductive layer comprises a copper substrate.
Claim 10
Dependent Claim
87 words
An anti-icing grid comprising: an insulating layer; a frequency selective layer disposed on a first side of said insulating layer having a plurality of openings formed therein in first rows which are spaced apart by gaps; and anti-icing means including a plurality of resistive elements formed on a second side of said insulating layer in second rows such that said resistive elements define projections when said second rows are projected onto said frequency selective layer, at least some projections of said second rows lie in said gaps.
Claim 11
Dependent Claim
87 words
An anti-icing grid comprising: an insulating layer; a frequency selective layer disposed on a first side of said insulating layer having a plurality of openings formed therein in first rows which are spaced apart by gaps; and anti-icing means including a plurality of resistive elements formed on a second side of said insulating layer in second rows such that said resistive elements define projections when said second rows are projected onto said frequency selective layer, at least some projections of said second rows lie in said gaps.
Claim 12
Dependent Claim
24 words
The anti-icing grid of claim 8, wherein said anti-icing means further comprises: current passing means for passing current through said plurality of resistive elements.
Claim 13
Dependent Claim
33 words
The anti-icing grid of claim 8, wherein said plurality of openings comprise a plurality of cross-shaped openings spaced at periodic intervals based on at least one operating frequency on said frequency selective layer.
Claim 14
Dependent Claim
18 words
The anti-icing grid of claim 8, further comprising at least one dielectric layer adjacent said frequency selective layer.
Claim 15
Dependent Claim
19 words
The anti-icing grid of claim 9, wherein said plurality of resistive elements are formed integrally in a conductive layer.
Claim 16
Dependent Claim
28 words
The anti-icing grid of claim 9, wherein said plurality of resistive elements are wires are embedded in a conductive layer that comprises one of copper, nichrome, or aluminum.
Claim 17
Dependent Claim
28 words
The anti-icing grid of claim 12, wherein said plurality of resistive elements are embedded in said conductive layer at a depth of about 5-10 mils from said openings.
Claim 18
Dependent Claim
27 words
The anti-icing grid of claim 13, wherein said plurality of resistive elements are embedded in said conductive layer a depth of about 5-10 mils from said openings.
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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) | 1999-06-18 | 1999-12-18 | 2000-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-06-18 | 2003-12-18 | 2004-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-06-18 | 2007-12-18 | 2008-06-18 | $7700.00 | Window Closed / Lapsed |