US4809003A
Expired / Lapsed
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Almond test body
Assignee: United States, NASA, Secretary of
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Filing: 1988-05-23
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Granted: 1989-02-28
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Expires: 2008-05-23
Abstract
Abstract An almond shaped radar cross-section test body for use in microwave anechoic chambers, which exhibits a large dynamic scattered field over large angular regions.
Inventors
- 👤 Allen K. Dominek
- 👤 Melvin C. Gilreath
- 👤 Richard M. Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:00
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/08; G01R29/10; G01R29/105; H; H01; H01Q; H01Q15/00; H01Q15/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
An almond test body comprising: the family of surface analytically defined by: Y=A.sub.1 [(1-(x/R.sub.1).sup.2).sup.1/2 -cos α] cos θ Z=B.sub.1 [(1-(x/R.sub.1).sup.2).sup.1/2 -cos α] sin θ cross-sections for x≧0; Y=A.sub.2 [(1-(x/R.sub.2).sup.2).sup.1/2 ] cos θ Z=B.sub.2 [(1-(x/R.sub.2).sup.2).sup.1/2 ] sin θ cross-sections for x≦0 where, 0°≦θ≦360° and, where the constants L, R 1 , R 2 A 1 , A 2 , B 1 and B 2 satisfy L=R.sub.2 +sin α.sub.1 R.sub.1 1=R.sub.1.sup.2 /R.sub.2.sup.2 (1-cos α.sub.1) where, 0.0<α.sub.1 <90° A.sub.1 =R.sub.1.sup.2 /R.sub.2.sup.2 A.sub.2 B.sub.1 =R.sub.1.sup.2 /R.sub.2.sup.2 B.sub.2 where, 2≦A.sub.2 /B.sub.2 ≦20 L=total body length; and R 2 =rear portion body length (blunt end).
Claim 2
Dependent Claim
99 words
An almond test body comprising: the family of surface analytically defined by: Y=A.sub.1 [(1-(x/R.sub.1).sup.2).sup.1/2 -cos α] cos θ Z=B.sub.1 [(1-(x/R.sub.1).sup.2).sup.1/2 -cos α] sin θ cross-sections for x≧0; Y=A.sub.2 [(1-(x/R.sub.2).sup.2).sup.1/2 ] cos θ Z=B.sub.2 [(1-(x/R.sub.2).sup.2).sup.1/2 ] sin θ cross-sections for x≦0 where, 0°≦θ≦360° and, where the constants L, R 1 , R 2 A 1 , A 2 , B 1 and B 2 satisfy L=R.sub.2 +sin α.sub.1 R.sub.1 1=R.sub.1.sup.2 /R.sub.2.sup.2 (1-cos α.sub.1) where, 0.0<α.sub.1 <90° A.sub.1 =R.sub.1.sup.2 /R.sub.2.sup.2 A.sub.2 B.sub.1 =R.sub.1.sup.2 /R.sub.2.sup.2 B.sub.2 where, 2≦A.sub.2 /B.sub.2 ≦20 L=total body length; and R 2 =rear portion body length (blunt end).
References Cited (Backward Citations)
US4713667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |