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US 7,126,557 B2Granted
Tapered area small helix antenna
AssigneeSouthwest Research Institute
InventorThomas J. Warnagiris
Life of this patent
Estimating the term…
Abstract
A wideband multi-mode antenna having low VSWR operating characteristics. The antenna element is formed from a right-triangularly shaped piece of conductive material, which is rolled along the base dimension. Operational characteristics may be modified by spacing the antenna element from a ground plane using dielectric spacers, and the antenna element may be shorted to the ground plane.
Claims28
A wideband multi-mode antenna, comprising:
- an antenna element made from a substantially triangular sheet of conductive material, the material having a height dimension and a base dimension;
- wherein the material has a rolled shape, such that the antenna has the height of the material, one or more turns having spacing between them, and a base having a diameter;
- a ground plate spaced from the base of the antenna element;
- at least one dielectric spacer for maintaining the space between the base of the antenna and the ground plate;
- wherein the antenna element is operable to provide a combination of monopole, transmission line, and helical radiation modes;
- and
- a feed point located relative to the base of the antenna element, such that the reactance of the monopole mode is substantially cancelled by the reactance of the transmission line mode.
4 more elements
A wideband multi-mode antenna, comprising:
- an antenna element made from a substantially triangular sheet of conductive material, the material having a height dimension and a base dimension;
- wherein the material has a rolled shape, such that the antenna has the height of the material, one or more turns having spacing between them, and a base having a diameter;
- a ground plate spaced from the base of the antenna element;
- and a conductive connector for shorting the base to the ground plate.
1 more element
A wideband multi-mode antenna, comprising:
- an antenna element made from a substantially triangular sheet of conductive material, the material having a height dimension and a base dimension;
- wherein the material has a folded shape, such that the antenna has the height of the material, and one or more folds having spacing between them, and such that the helical transmission mode of the antenna element is substantially suppressed.
Dependencies are inferred from the claim text.