Patent US4990918A successfully refreshed from Google Patents.
US4990918A
Expired / Lapsed
US
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Radar reflector to enhance radar detection
Assignee: University of British Columbia
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Filing: 1989-12-21
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Granted: 1991-02-05
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Expires: 2009-12-21
Abstract
Abstract A radar reflector provides an enhanced radar cross section pattern in one plane and this improved radar detectability in that plane. The radar reflector comprising a trihedral corner reflector arrangement having three planar faces at right angles to each other, a first planar face substantially triangular in shape having a right angle representing a common vertex, second and third planar faces joined at inner edges of the second and third planar faces to form a center line extending from the common vertex and each joined to the first planar face at straight sides extending from the common vertex such that the reflector is symmetrical about the center line, the center line being shorter than the two straight sides.
Inventors
- 👤 David G. Michelson
- 👤 Helmut H. Lanziner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:09
CPC Classifications
H; H01; H01Q; H01Q15/00; H01Q15/14; H01Q15/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
185 words
A radar reflector to enhance radar detection in one plane comprising a trihedral corner reflector arrangement having three planar faces at right angles to each other, a first planar face substantially triangular in shape having a right angle representing a common vertex, second and third planar faces joined at inner edges of the second and third planar faces to form a center line extending from the common vertex and each joined to the first planar face at straight sides extending from the common vertex such that the reflector is symmetrical about the center line, the center line being shorter than the two straight sides, the trihedral corner reflector arrangement being rotationally asymmetric about a boresight which makes equal angles with each of the three planar faces, the shape of the planar faces being such that radar cross section response in a first plane containing the boresight and being perpendicular to the center line is greater than radar cross section response in a second plane containing the boresight and the center line, and the reflector arrangement mountable on a surface without need for additional supporting structure.
Claim 2
Dependent Claim
185 words
A radar reflector to enhance radar detection in one plane comprising a trihedral corner reflector arrangement having three planar faces at right angles to each other, a first planar face substantially triangular in shape having a right angle representing a common vertex, second and third planar faces joined at inner edges of the second and third planar faces to form a center line extending from the common vertex and each joined to the first planar face at straight sides extending from the common vertex such that the reflector is symmetrical about the center line, the center line being shorter than the two straight sides, the trihedral corner reflector arrangement being rotationally asymmetric about a boresight which makes equal angles with each of the three planar faces, the shape of the planar faces being such that radar cross section response in a first plane containing the boresight and being perpendicular to the center line is greater than radar cross section response in a second plane containing the boresight and the center line, and the reflector arrangement mountable on a surface without need for additional supporting structure.
Claim 3
Dependent Claim
27 words
The radar reflector according to claim 1 wherein the second and third planar faces each have a right angle at the common vertex and form a trapezium.
Claim 4
Dependent Claim
36 words
The radar reflector according to claim 1 wherein the second and third planar faces each have a right angle at the common vertex and form a trapezoid with the center line parallel to the opposite side.
Claim 5
Dependent Claim
57 words
The radar reflector according to claim 1 wherein the second and third planar faces each have a right angle at the common vertex and form a five sided shape extending out beyond the first planar face such that radar cross section response in the first plane is greater than radar cross section response in the second plane.
Claim 6
Dependent Claim
20 words
The radar reflector according to claim 1 wherein two radar reflectors are arranged adjacent each other to achieve space diversity.
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) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |