US3761937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio frequency transmitting apparatus having slotted metallic radio frequency windows
Assignee: General Dynamics Corp
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Filing: 1972-05-11
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Granted: 1973-09-25
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Expires: 1992-05-11
Abstract
Abstract A slot antenna or radome having increased bandwidth capability may be made of a metallic sheet which is curved in the case of a radome, or flat in the case of the side of a waveguide, the sheet has a plurality of slots with edges which are beveled toward each other from the outer surface of the sheet, such that the metallic walls of the window are thin and approach the skin depth for the highest frequency of radio frequency waves which are to be transmitted. With longer wavelengths the electromagnetic field penetrates through the thin edge so that the window is effectively larger, thereby providing improved transmittance over a broad bandwidth.
Inventors
- 👤 G Tricoles
- 👤 E Rope
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:25
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/42; H01Q1/425; H01Q15/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
38 words
An apparatus for transmitting radio frequency waves through a metallic member, a window through said member having a beveled edge which tapers at least to a thickness approaching the skin depth for the highest frequency of said waves.
Claim 2
Independent Claim
38 words
An apparatus for transmitting radio frequency waves through a metallic member, a window through said member having a beveled edge which tapers at least to a thickness approaching the skin depth for the highest frequency of said waves.
Claim 3
Dependent Claim
29 words
The invention as set forth in claim 1 wherein said member is a metallic sheet having a continuous, solid sheet of dielectric material in side by side relationship therewith.
Claim 4
Dependent Claim
54 words
The invention as set forth in claim 1 wherein said member is a sheet, and said window is a rectangular opening in said sheet, opposite edges of said rectangular opening are beveled to diverge in opposite directions whereby said window is narrower on one surface of said sheet than on the opposite surface thereof.
Claim 5
Dependent Claim
29 words
The invention as set forth in claim 3 wherein said beveled edges extend to lines at the intersection of said beveled edges and the inner side of said sheet.
Claim 6
Dependent Claim
41 words
The invention as set forth in claim 3 wherein said beveled edges each have a plurality of steps, the steps at the narrowest dimension of said window having said thickness approaching said skin depth for said highest frequency of said waves.
Claim 7
Dependent Claim
62 words
The invention as set forth in claim 3 wherein said beveled edges each have a profile including a curved section extending from the thickest portion of said edge a distance approximately one-half the thickness of said sheet, followed by a section of constant thickness which is followed by a linear reduction in thickness to a point at the apex of said edge.
Claim 8
Dependent Claim
23 words
The invention as set forth in claim 3 wherein said beveled edges each are provided by a separate section of low-conductivity metallic material.
Claim 9
Dependent Claim
41 words
A radome which comprises a sheet of metallic material, a plurality of windows which extend through said sheet, each window being formed by a slot having a beveled edge the bevel of which extends between the opposite surfaces of said sheet.
Claim 10
Dependent Claim
41 words
A radome which comprises a sheet of metallic material, a plurality of windows which extend through said sheet, each window being formed by a slot having a beveled edge the bevel of which extends between the opposite surfaces of said sheet.
Claim 11
Dependent Claim
19 words
The invention as set forth in claim 8 wherein said slots are beveled on at least two opposite edges.
Claim 12
Dependent Claim
28 words
The invention as set forth in claim 9 wherein said edges are beveled inwardly toward each other in a direction away from the outer surface of said radome.
Claim 13
Dependent Claim
31 words
The invention as set forth in claim 8 including a continuous sheet of dielectric material in juxtaposition with the surface of said metallic sheet which faces the interior of said radome.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |