Double-section, low-profile, low-observable, wide-band, azimuthally-omni-directional monopole antenna
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorDavid Walker Brock
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Abstract
A low-profile antenna comprising upper and lower sets of conductive arms capacitively loaded by upper and lower conductive rings respectively connected to distal ends of the upper and lower sets of conductive arms. The upper and lower conductive arms have edges that conform to prolate ellipsoid dome shapes that each have a major axis that aligns with a center axis. The upper and lower conductive arms converge at an upper hub and a lower hub at crowns of the prolate ellipsoid dome shapes, which have interiors that are substantially filled with RF-absorbing material. The upper and lower hubs are separated by an air gap.
Claims20
A low-profile antenna comprising:
- an upper set of conductive arms capacitively loaded by an upper conductive ring connected to distal ends of the upper set of conductive arms, wherein each conductive arm of the upper set has an edge that conforms to a prolate ellipsoid dome shape that has a major axis that aligns with a center axis, wherein the upper set of conductive arms converge at an upper hub at a crown of the prolate ellipsoid dome shape, an interior of which is substantially filled with an upper absorber made of RF-absorbing material;
- and
- a lower set of conductive arms capacitively loaded by a lower conductive ring, which is connected to a ground plane and to distal ends of the lower set of conductive arms, wherein each of the conductive arms of the lower set has an edge that conforms to an inverted prolate ellipsoid dome shape that has a major axis that aligns with the center axis, wherein the lower set of conductive arms converge at a lower hub at a crown of the inverted prolate ellipsoid dome shape, an interior of which is substantially filled with a lower absorber made of RF-absorbing material, wherein the upper and lower hubs are separated by an air gap.
A low-profile antenna comprising:
- a ground plane;
- an upper antenna section having an upper hub, an upper set of conductive arms extending radially from the upper hub, and an upper conductive ring disposed parallel to the ground plane and electrically connected to distal ends of each of the arms of the upper set, wherein each arm of the upper set has a surface that substantially conforms to an upper prolate ellipsoid dome shape that has a crown aligned with the upper hub and a base aligned with the upper conductive ring;
- a lower antenna section having a lower hub, a lower set of conductive arms extending radially from the lower hub, and a lower conductive ring disposed parallel to, and in contact with, the ground plane and electrically connected to distal ends of each of the arms of the lower set of conductive arms, wherein each arm of the lower set of conductive arms has a surface that substantially conforms to a lower prolate ellipsoid dome shape that has a crown aligned with the lower hub and a base aligned with the lower conductive ring;
- wherein the upper and lower antenna sections share a common center axis and the upper and lower hubs are separated by an air gap;
- and
- wherein the upper antenna section is rotationally offset from the lower antenna section about the center axis such that no two arms of the upper and lower sets of conductive arms are vertically aligned with each other.
Dependencies are inferred from the claim text.