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US 7,623,075 B2Granted
Ultra compact UHF satcom antenna
AssigneeBAE Systems Information and Electronics Systems Integration Inc.
InventorJohn T. Apostolos
Life of this patent
Estimating the term…
Abstract
A miniature volumetric spherical geometry with multiple symmetric feeds is spaced from the surface of the vehicle or platform, with the antenna exhibiting both circular polarization that is orientation-independent or angle of arrival independent, while at the same time covering a broad band of frequencies from 243-318 MHz in one embodiment.
Claims16
An ultra compact UHF satcom antenna mountable on a platform that forms a ground plane, comprising:
- a cubic substrate having antenna elements thereon, said cubic substrate having sides carrying rectilinear elements and a top and bottom having triangular elements with opposed triangular elements having opposed apexes, the elements on the top of said cube being a mirror image of those on the bottom of said cubic substrate;
- and,
- a phasing network coupled to selected elements on the bottom of said cubic substrate for providing a circular polarization characteristic for said antenna at least in a hemisphere with said antenna at its center.
A method for providing a compact orientation-independent antenna, comprising:
- providing a cubic antenna substrate;
- locating quadrature antenna elements on the bottom of the cubic substrate;
- providing matching quadrature antenna elements on the top of the cubic substrate;
- locating the cubic substrate with the elements thereon above a ground plane;
- and,
- driving the elements on the bottom of the cubic substrate to produce a pair of vertical crossed loops that provide circular polarization at the azimuth of the antenna, the ground plane providing horizontal components to fill in so that the antenna has a circular polarization characteristic at or near the horizontal.
3 more elements
Dependencies are inferred from the claim text.