RECONFIGURABLE ANTENNA USING ADDRESSABLE PIXEL PISTONS

• US 20080198074A1
• Filed: 02/15/2008
• Published: 08/21/2008
• Est. Priority Date: 02/16/2007
• Status: Active Grant

• Current Assignee: Syntonics, LLC, The Ohio State University Research Foundation
• Original Assignee: Ohio State University
• Inventors: Montgomery, Bruce G., Walton, Eric K.
• Granted Patent: US 7,561,109 B2
• Time in Patent Office: Days
• US Class Current: 343/700.0MS
• CPC Class Codes: H01Q 21/065 Patch antenna array
• CPC Class Codes: H01Q 3/01 varying the shape of the antenna or antenna system
• CPC Class Codes: H01Q 9/0442 with particular tuning means

Abstract

An antenna made up of addressable conductive segments, or pixel elements, affixed to the top of each piston in a piston array is presented. The pixel elements can be activated in less than a millisecond to form an antenna array and transmission line pattern using movable pistons and a two-dimensional actuator. Each piston comprises a handle, a bottom conductive segment affixed to the top of the handle, a dielectric segment affixed to the uppermost surface of the bottom conductive segment, and a top conductive segment affixed to the uppermost surface of the dielectric segment. When the piston is not actuated, the top conductive segment forms part of a ground plane. The top conductive segment form part of the transmission line and antenna array patterns, the dielectric segment becomes a dielectric space and the bottom conductive segment forms part of the ground plane when the piston is actuated.

Claims

1. An antenna structure, comprising:

a two-dimensional actuator;

an array of pistons positioned over the actuator, each piston in the array comprising,

a handle,

a bottom conductive segment affixed to the top of the handle,

a dielectric segment affixed to the uppermost surface of the bottom conductive segment, and

a top conductive segment affixed to the uppermost surface of the dielectric segment, wherein the top conductive segment forms part a ground plane when the piston is not actuated,

wherein when a subset of the pistons is actuated by the two-dimensional actuator, the top conductive segments of a subset of the array of pistons form transmission line and antenna array patterns and the bottom conductive segments of the subset of the array of pistons integrates with the ground plane.

2. The antenna structure of claim 1, wherein the two-dimensional actuator controls the positioning of each piston in the array of pistons.

3. The antenna structure of claim 2, wherein the two-dimensional actuator is configured to control the positioning of the pistons magnetically, capacitively, hydraulically, mechanically, or combinations thereof.

4. The antenna structure of claim 1, wherein the shape of the top conductive segment comprises triangles, squares, hexagons, or any other suitable shape.

5. The antenna structure of claim 1, wherein the top conductive segment is comprised of metal.

6. The antenna structure of claim 5, wherein the metal of the top conductive segment comprises gold, copper or combinations thereof.

7. The antenna structure of claim 1, wherein the top conductive segment has width of approximately 1/20 wavelength.

8. The antenna structure of claim 1, wherein top conductive segment has a width of about 0.7 mm at 21 GHz.

9. The antenna structure of claim 1, wherein the dielectric segment has a length of about 1/10 wavelength.

10. The antenna structure of claim 1, wherein the dielectric segment of about 1.4 mm at 21 GHz.

11. The antenna structure of claim 1, wherein the bottom conductive segment is comprised of substantially the same metal as the top conductive segment.

12. The antenna structure of claim 1, wherein the piston has an overall length of about 11 mm.

13. A method of rapidly configuring antenna structure, the antenna structure comprises a two-dimensional actuator, an array of pistons, each piston comprising a top conductive segment, a dielectric segment, a bottom conductive segment and a handle, wherein the method comprises:

forming a ground plane with the top conductive segments of the array of pistons when the array of pistons is not actuated by the two-dimensional actuator;

creating antenna arrays and transmission lines by forming conductive patterns with the top conductive segments over the ground plane by actuating the individual pistons of the array of pistons to move from the ground plane to a predetermined distance over the ground plane using the two-dimensional actuator, such that the bottom conductive segment integrates with the ground plane when the piston is actuated.

14. The method of claim 13, further comprises:

positioning of the array of pistons magnetically, capacitively, hydraulically, mechanically, or combinations thereof.

15. The method of claim 13, further comprises:

reconfiguring the patterns of the antenna arrays and the transmission lines in less than a millisecond.

16. The method of claim 13, further comprises:

controlling beamwidth by using the formed transmission lines and antenna arrays.

17. The method of claim 13, further comprises:

determining polarization by the geometry of the pixel elements and how the pixel elements are fed.

18. The method of claim 13, further comprises:

adjusting the size of the antenna array, the number of elements in the antenna array and power distribution over the antenna array to yield a desired operational frequency and gain pattern.

19. The method of claim 13, further comprising:

attaching small stubs to the transmission lines to optimize the performance of the antenna array.

20. The method of rapidly reconfiguring an antenna structure, the method comprising:

providing an array of pistons, each piston comprising,

a handle,

a bottom conductive segment affixed to the top of the handle,

a dielectric segment affixed to the uppermost surface of the bottom conductive segment, and

a top conductive segment affixed to the uppermost surface of the dielectric segment, wherein the top conductive segment integrate to form a ground plane when not actuated;

forming transmission lines and antenna array patterns by moving a subset of the array of pistons up from the ground plane until the bottom conductive segment becomes integrated with the ground plane; and

controlling the formation of the transmission lines and antenna array patterns by a two-dimensional actuator.