US3680136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current sheet antenna
Assignee: United States Department of the Navy
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Filing: 1971-10-20
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Granted: 1972-07-25
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Expires: 1991-10-20
Abstract
Abstract An antenna comprises a conductive ground surface element and at least one conductive radiator element in the form of an extended two dimensional sheet. The conductive radiator element is mounted parallel to the ground surface element and no more than onefifteenth of an operating free-space wavelength from it. Signals are fed to at least two points on the radiator element wherein the signals at the points excite the radiator element symmetrically to cause current to flow across the outer surface of the conductive radiator element in the lowest mode of excitation.
Inventors
- 👤 Rupert H Collings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:06
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/0407
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
129 words
An antenna comprising an extended conducting ground surface element, at least one conducting radiator element of an extended two-dimensional shape substantially parallel to and no more than 0.15 operating wavelengths from said ground surface element, and electrical feed means for exciting said radiator element symmetrically to cause current to flow across the surface of said radiator element remote from said ground surface element in the lowest mode of excitation, and a pair of opposed tuning capacitors respectively positioned at a different edge of said radiator element between said radiator element and said conducting ground surface, the dimension of said radiator element in the direction of current flow being less than 0.7 operating wavelengths and the dimension perpendicular to the direction of current flow is at least 0.15 operating wavelengths.
Claim 2
Dependent Claim
129 words
An antenna comprising an extended conducting ground surface element, at least one conducting radiator element of an extended two-dimensional shape substantially parallel to and no more than 0.15 operating wavelengths from said ground surface element, and electrical feed means for exciting said radiator element symmetrically to cause current to flow across the surface of said radiator element remote from said ground surface element in the lowest mode of excitation, and a pair of opposed tuning capacitors respectively positioned at a different edge of said radiator element between said radiator element and said conducting ground surface, the dimension of said radiator element in the direction of current flow being less than 0.7 operating wavelengths and the dimension perpendicular to the direction of current flow is at least 0.15 operating wavelengths.
Claim 3
Dependent Claim
20 words
The antenna of claim 1 wherein the shape of said radiator element is symmetrical about the direction of current flow.
Claim 4
Dependent Claim
37 words
The antenna of claim 1 wherein said electrical feed means comprises at least two feed points symmetrically placed about the center of said radiator element and the signals fed to said feed points being in anti-phase relationship.
Claim 5
Dependent Claim
24 words
The antenna of claim 1 further comprising a conductive support means for connecting said ground surface element to the center of said radiator element.
Claim 6
Dependent Claim
27 words
The antenna of claim 1 wherein the space between said ground surface element and said radiator element is at least partially filled with a solid dielectric material.
Claim 7
Dependent Claim
18 words
The antenna of claim 1 wherein said ground surface element and said radiator element have the same contour.
Claim 8
Dependent Claim
60 words
The antenna of claim 1 wherein said electrical feed means comprises two pair of feed points wherein the feed points of each pair are symmetrically placed with respect to the center of said radiator element and the lines connecting the feed points of each pair are mutually orthogonal and means for feeding the pairs of feed points in phase quadrature.
Claim 9
Dependent Claim
35 words
The antenna of claim 1 wherein said conducting surface element is at least partially closed and said radiator element being disposed adjacent to at least a part of a surface of said ground surface element.
Claim 10
Dependent Claim
12 words
The antenna of claim 1 wherein said ground surface element is continuous.
Claim 11
Dependent Claim
20 words
The antenna of claim 1 wherein said ground surface element comprises a plurality of discrete electrically conductive surfaces electrically interconnected.
Claim 12
Dependent Claim
24 words
The antenna of claim 1 wherein said ground surface element has an area at least as great as the area of said radiator element.
Claim 13
Dependent Claim
12 words
The antenna of claim 1 comprising a plurality of spaced radiator elements.
Claim 14
Dependent Claim
43 words
The antenna of claim 12 where the feed points of each radiator element are on a line passing through the center of the radiator element with each point being on an opposite side of the center and wherein said lines are substantially parallel.
Claim 15
Dependent Claim
72 words
The antenna of claim 12 comprising a plurality of similar rectangular spaced radiator elements wherein the long axis of each element extends in the same given direction and said elements being spaced from each other in a second direction perpendicular to said given direction, each of said rectangular radiator elements having a plurality of pairs of feed points, the lines joining said pairs of feed points being parallel to said second direction.
References Cited (Backward Citations)
US3478362A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |