Steerable antenna system and method
View Patent ↗An antenna system steerable in any direction and methods of use are provided. In an embodiment, the antenna system comprises a substantially ellipsoid-shaped shell body and a plurality of cells coupled to the body, wherein each cell comprises a conductive material. In an embodiment, the shell body comprises a metasurface. In an embodiment, the antenna system further includes a plurality of switches coupled to the plurality of cells, wherein each switch is configured to change its coupled cell between reflective, transmissive, and absorptive states. The antenna system further includes a feed radiator located at or around the center of the shell body; a radio coupled to the feed; and a processor coupled to the feed, radio, and the plurality of switches, wherein the processor is configured to produce a shaped beam by controlling a subset of the plurality of switches.
1 . An antenna system comprising:
a substantially ellipsoid-shaped shell body;
a plurality of cells coupled to the body, wherein each cell comprises a conductive material;
a plurality of switches coupled to the plurality of cells, wherein each switch is configured to change its coupled cell between one of a reflective and non-reflective state;
a feed located around the center of the shell body and comprising four parallel feed conductors, wherein each of the four feed conductors are connected to a separate but phase-coherent input or output of a software-defined radio and have a common signal return connection;
an antenna comprising four angled elements connected to the four parallel feed conductors; and
a processor coupled to the feed, the software-defined radio, and the plurality of switches, wherein the processor is configured to produce a shaped beam by controlling a subset of the plurality of switches.
2 . The antenna system of claim 1 , wherein the body comprises a substantially spherical shape.
3 . The antenna system of claim 1 , wherein the body comprises a polyhedron.
4 . The antenna system of claim 1 , wherein at least one of the plurality of cells comprises a closed geometric shape.
5 . The antenna system of claim 1 , wherein at least one of the plurality of cells comprises an open geometric shape.
6 . The antenna system of claim 5 , wherein the open geometric shape comprises two or more intersecting lines.
7 . The antenna system of claim 1 , wherein the plurality of cells comprises a configuration of different geometries to allow for at least one of multifrequency operation and better coverage.
8 . The antenna system of claim 1 , wherein at least one of the plurality of cells reflects polarized radiation.
9 . The antenna system of claim 8 , wherein the polarized radiation comprises at least one of circular, linear, or elliptical polarized radiation.
10 . The antenna system of claim 1 , wherein each of the plurality of cells are separately controlled.
11 . The antenna system of claim 1 , wherein the plurality of switches are coupled to one or more control lines.
12 . The antenna system of claim 11 , wherein the control lines comprise one or more of etched or embedded conductors.
13 . The antenna system of claim 1 , wherein the processor is configured to form a dish-shaped reflector on a portion of the body by controlling a subset of the plurality of switches.
14 . The antenna system of claim 1 , wherein the processor is configured to form a majority-sphere reflector by controlling a subset of the plurality of switches.
15 . The antenna system of claim 1 , wherein capacitors and inductors are coupled to the plurality of cells and are used to control a phase of reflected or transmitted signals.
16 . The antenna system of claim 1 , wherein the processor is configured to cause the plurality of cells to transmit a beam at multiple frequencies by controlling a subset of the plurality of switches.
17 . The antenna system of claim 1 , wherein the processor is configured to cause the plurality of cells to transmit multiple beams at multiple frequencies by controlling a subset of the plurality of switches.
18 . The antenna system of claim 1 , wherein each of the plurality of cells comprises a nested surface.
19 . An antenna system comprising:
a substantially spherical shell body;
a plurality of cells coupled to the body, wherein each cell comprises crossed dipoles with a switch in the center that when open causes the cell to become a conductor for radio signals and when closed to become a crossed half-wave dipole for reflecting radio signals;
a feed located around the center of the shell body and comprising four parallel feed conductors;
an antenna comprising four angled elements connected to the four parallel feed conductors, and wherein the angled elements are arranged to radiate any polarization in any direction over a 4-pi steradian sphere;
a software-defined radio with four coherent channels coupled to the four feed conductors; and
a processor coupled to the feed, the software-defined radio, and to the plurality of switches, wherein the processor is configured to form a majority-sphere reflector at a desired frequency by controlling a subset of the plurality of switches.