US5014070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radar camouflage material
Assignee: Telefunken Systemtechnik AG
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Filing: 1988-07-08
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Granted: 1991-05-07
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Expires: 2008-07-08
Abstract
Abstract A radar camouflage material for reducing the radar back-scatter cross section of a target object including a thin layer or foil of dielectric material provided with a plurality of individual antenna elements of the minimum-scatter antenna type, preferably ring antennas, which are loaded purely reactively.
Inventors
- 👤 Don J. R. Stock
- 👤 Eberhard Eckert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:49
CPC Classifications
H; H01; H01Q; H01Q17/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
A radar camouflage material for reducing the radar back-scatter cross section of a target object, said material comprising a layer of dielectric material having a plurality of spaced minimum-scatter type antenna elements disposed thereon, with said minimum-scatter type antenna elements each being terminated in a purely reactive manner such that a received wave reflected at the termination substantially cancels the corresponding scattered wave; and wherein: said antenna type elements are each a ring antenna type element configured as an open ring whose ends are connected with a line section of a length to cause said substantial cancellation; each said ring antenna type element is formed as an open ring shaped conductive film disposed on one surface of said layer of dielectric material; and the open portions of said rings are oriented in random directions in the plane of said one surface.
Claim 2
Dependent Claim
141 words
A radar camouflage material for reducing the radar back-scatter cross section of a target object, said material comprising a layer of dielectric material having a plurality of spaced minimum-scatter type antenna elements disposed thereon, with said minimum-scatter type antenna elements each being terminated in a purely reactive manner such that a received wave reflected at the termination substantially cancels the corresponding scattered wave; and wherein: said antenna type elements are each a ring antenna type element configured as an open ring whose ends are connected with a line section of a length to cause said substantial cancellation; each said ring antenna type element is formed as an open ring shaped conductive film disposed on one surface of said layer of dielectric material; and the open portions of said rings are oriented in random directions in the plane of said one surface.
Claim 3
Dependent Claim
26 words
A radar camouflage material as defined in claim 1, wherein said line section is an open-circuited line section of a length to cause said substantial cancellation.
Claim 4
Dependent Claim
26 words
A radar camouflage material as defined in claim 1, wherein said line section is a short-circuited line section of a length to cause said substantial cancellation.
Claim 5
Dependent Claim
27 words
A radar camouflage material as defined in claim 1 wherein a continuous film of metal is disposed on the opposite surface of said layer of dielectric material.
Claim 6
Dependent Claim
27 words
A radar camouflage material as defined in claim 1 wherein only said ring antenna type elements disposed on said one surface of said layer of dielectric material.
Claim 7
Dependent Claim
24 words
A radar camouflage material as defined in claim 1 wherein said ring antenna type elements arranged in an array with a spacing of λ/4.
Claim 8
Dependent Claim
25 words
A radar camouflage material as defined in claim 3 wherein said ring antenna type elements are arranged in an array with a spacing of λ/4.
Claim 9
Dependent Claim
20 words
A radar camouflage material as defined in claim 3 wherein only said conductive films are disposed on said one surface.
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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) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |