Patent US4437099A successfully refreshed from Google Patents.
US4437099A
Expired / Lapsed
US
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Polarization converter for electromagnetic waves
Assignee: Siemens AG
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Filing: 1981-03-20
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Granted: 1984-03-13
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Expires: 2001-03-20
Abstract
Abstract The invention relates to apparatus for converting electromagnetic waves with a particular polarization into waves having circular polarization wherein a single or multi-layer conductor grid structure is placed in front of the radiation aperture. If it is necessary due to spatial requirements of the radome, the circular polarization grid may be non-planar and according to the invention the geometric development of the grid structure can be determined by projecting a desired grid structure disposed in the radiation aperture plane upon a non-planar such as a cone-shaped surface. The manufacture of the grid structure can be accomplished by first forming the grid structure on a surface such as plastic with conducting strips or members formed thereon and so arranged such that when the plastic sheet is formed into a cone by removing a pie-shaped segment the desired non-planar pattern results.
Inventors
- 👤 Erich Kandler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:07
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/42; H01Q1/425; H01Q15/00; H01Q15/24; H01Q15/242; H01Q15/244
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
67 words
The method of forming a non-planar polarization grid structure comprising, forming conductive lines on a disc of planar insulation material, removing a pie-shaped portion of said disc, and joining the edges of said disc where the pie-shaped portion was removed to form a cone and the pattern of said conductive lines as viewed from the apex of the cone having the desired shape to obtain circular polarization.
Claim 2
Independent Claim
67 words
The method of forming a non-planar polarization grid structure comprising, forming conductive lines on a disc of planar insulation material, removing a pie-shaped portion of said disc, and joining the edges of said disc where the pie-shaped portion was removed to form a cone and the pattern of said conductive lines as viewed from the apex of the cone having the desired shape to obtain circular polarization.
Claim 3
Dependent Claim
46 words
A grid structure for converting electromagnetic waves having a given polarization to a circular polarization comprising, a conical-shaped surface of insulation material with conductive lines formed thereon with the conductive lines when projected on a plane normal to the conical-shaped surface being parallel to each other.
Claim 4
Dependent Claim
46 words
A grid structure for converting electromagnetic waves having a given polarization to a circular polarization comprising, a conical-shaped surface of insulation material with conductive lines formed thereon with the conductive lines when projected on a plane normal to the conical-shaped surface being parallel to each other.
Claim 5
Dependent Claim
90 words
A single- or multiple-layer conductor grid line structure placed in front of a radiation aperture for converting electromagnetic waves having a given polarization to circular polarization, characterized in that the conductor grid line structure (1) for converting electromagnetic waves having a given polarization to circular polarization is arranged to form a non-planar surface, and the geometric progression of the grid line structure (1) on the non-planar surface corresponds to the top plan view of an imaginary circular polarization producing grid line structure placed in the plane of said radiation aperture.
Claim 6
Dependent Claim
90 words
A single- or multiple-layer conductor grid line structure placed in front of a radiation aperture for converting electromagnetic waves having a given polarization to circular polarization, characterized in that the conductor grid line structure (1) for converting electromagnetic waves having a given polarization to circular polarization is arranged to form a non-planar surface, and the geometric progression of the grid line structure (1) on the non-planar surface corresponds to the top plan view of an imaginary circular polarization producing grid line structure placed in the plane of said radiation aperture.
Claim 7
Dependent Claim
34 words
A structure according to claim 3, characterized in that said aperture comprises a tracking radar antenna with a cover and reflector mirror, and said grid structure is integrated with the reflector aperture radome cover.
Claim 8
Dependent Claim
127 words
A single- or multiple-layer conductor grid structure placed in front of a radiation aperture for converting electromagnetic waves having a given polarization to circular polarization, characterized in that the conductor grid structure (1) for converting electromagnetic waves having a given polarization to circular polarization is arranged to form a non-planar surface, and the geometric progression of the grid structure (1) on the non-planar surface is determined by the projection of an imaginary circular polarization producing plane grid structure on said non-planar surface, and characterized in that the non-planar surface is a cone envelope surface with the apex projecting toward the exterior in front of a circularly designed radiation aperture with the symmetry axis of said cone envelope surface coinciding with the mean perpendicular to the radiation aperture.
Claim 9
Dependent Claim
127 words
A single- or multiple-layer conductor grid structure placed in front of a radiation aperture for converting electromagnetic waves having a given polarization to circular polarization, characterized in that the conductor grid structure (1) for converting electromagnetic waves having a given polarization to circular polarization is arranged to form a non-planar surface, and the geometric progression of the grid structure (1) on the non-planar surface is determined by the projection of an imaginary circular polarization producing plane grid structure on said non-planar surface, and characterized in that the non-planar surface is a cone envelope surface with the apex projecting toward the exterior in front of a circularly designed radiation aperture with the symmetry axis of said cone envelope surface coinciding with the mean perpendicular to the radiation aperture.
Claim 10
Dependent Claim
14 words
A structure according to claim 5 comprising etched metal strips on a plastic sheet.
Claim 11
Dependent Claim
19 words
A structure according to claim 5 comprising etched metal strips on a plastic sheet consisting of continuous lines (1).
Claim 12
Dependent Claim
19 words
A structure according to claim 5 comprising etched metal strips on a plastic sheet consisting of meander lines (2).
Claim 13
Dependent Claim
20 words
A structure according to claim 5 comprising etched metal strips on a plastic sheet of lines and adjacent rectangles (3).
Claim 14
Dependent Claim
14 words
A structure according to claim 5 used as an aperture cover for an antenna.
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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) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |