Bicone pattern shaping device

• US 20070205961A1
• Filed: 02/12/2007
• Published: 09/06/2007
• Est. Priority Date: 02/10/2006
• Status: Active Grant

• Current Assignee: EMS Technologies, Inc. (Honeywell International Inc.)
• Original Assignee: EMS Technologies, Inc. (Honeywell International Inc.)
• Inventors: Black, Donald, Jones, Alan, Bunce, Bayne, Newbury, Terence, Parr, R.
• Granted Patent: US 7,525,501 B2
• Time in Patent Office: Days
• US Class Current: 343/911.R
• CPC Class Codes: H01Q 19/062 for focusing
• CPC Class Codes: H01Q 9/28 Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines waveguide horns or mouths H01Q13/00; slot antennas H01Q13/00

Abstract

A broadband omni-directional bicone antenna. The antenna can comprise conductive surfaces of conical voids provided within a solid dielectric structure. The outside surface of the solid structure can support a radio frequency (RF) lens geometry operable for beam forming. The beam forming can modify the elevation pattern of the electromagnetic radiation from the bicone antenna. The solid dielectric structure may be machined or molded from a single piece of material. The conical voids provided within the solid structure can be metallized to provide conductive bicone radiators. The outer surface beam shaping lenses can be zoned or continuous and can provide elevation patterns with increased gain, cosecant squared falloff, or various other patterns. The beam shaping lens may be formed from any low-loss dielectric. Alternatively, the lens may be formed from a less dense material such as dielectric foam that can support radial conductive beam forming vanes.

Claims

1. An antenna system comprising:

a substantially cylindrical dielectric solid;

an antenna element coaxially disposed within a void of the dielectric solid; and

a beam shaping lens formed from an outside surface of the dielectric solid, the beam shaping lens operable to interact with an electromagnetic field associated with the antenna element.

2. The antenna system of claim 1, wherein the antenna element comprises a metallized surface applied to the void within the dielectric solid.

3. The antenna system of claim 1, further comprising a second antenna element coaxially disposed with another void of the dielectric material, wherein the antenna element and the second antenna element are positioned at opposing sides of the dielectric material and each comprise a metallized surface applied to the corresponding void of the dielectric material.

4. The antenna system of claim 1, further comprising a feed line in electrical communication with the antenna element.

5. The antenna system of claim 1, wherein the beam shaping lens comprises a Fresnel lens.

6. The antenna system of claim 1, wherein the beam shaping lens comprises a Fresnel zone plate.

7. The antenna system of claim 1, wherein the beam shaping lens comprises a curved lens operable to collimate the electromagnetic field and operable increase an antenna gain of the antenna element.

8. The antenna system of claim 1, wherein the beam shaping lens comprises a curved lens operable to provide a substantially cosecant squared elevation pattern of the electromagnetic field.

9. The antenna system of claim 1, wherein the beam shaping lens comprises conductive radial vanes.

10. An antenna system comprising:

a dielectric solid comprising a substantially cylindrical geometry;

a void disposed within the dielectric solid, the void comprising a substantially conical geometry and positioned coaxially within the cylindrical geometry;

a metallized surface positioned proximate to the void, the metallized surface operable as an antenna element; and

a beam shaping lens formed from an outside surface of the dielectric solid, the beam shaping lens operable to interact with an electromagnetic field associated with the antenna element.

11. The antenna system of claim 10, further comprising a second metallized void within the dielectric solid, the second void comprising a substantially conical geometry, positioned coaxially to the cylindrical geometry, and positioned so that a vertex of the second void is adjacent to a vertex of the void.

12. The antenna system of claim 10, further comprising a feed line in electrical communication with the antenna element.

13. The antenna system of claim 10, wherein the beam shaping lens comprises a Fresnel lens.

14. The antenna system of claim 10, wherein the beam shaping lens comprises a Fresnel zone plate.

15. The antenna system of claim 10, wherein the beam shaping lens comprises a curved lens operable to collimate the electromagnetic field and operable increase an antenna gain of the antenna element.

16. The antenna system of claim 10, wherein the beam shaping lens comprises a curved lens operable to provide a substantially cosecant squared elevation pattern of the electromagnetic field.

17. The antenna system of claim 10, wherein the beam shaping lens comprises conductive radial vanes.

18. A method for manufacturing a bicone beam forming antenna comprising the steps of:

forming cone shaped supports within a dielectric material;

forming a beam shaping lens on an outside surface of the dielectric material;

disposing conductive bicone antenna elements within the cone shaped supports; and

providing a feed line in electrical communication with the bicone antenna elements.

19. The method of claim 18, further comprising the step of providing radial beam shaping vanes within the dielectric material.

20. The method of claim 18, wherein the step of forming cone shaped supports comprises machining.

21. The method of claim 18, wherein the step of forming cone shaped supports comprises molding.

22. The method of claim 18, wherein the step of forming a beam shaping lens comprises machining.

23. The method of claim 18, wherein the step of forming a beam shaping lens comprises molding.

24. The method of claim 18, further comprising the step of selecting a beam shaping lens geometry to achieve a desired elevation pattern for the bicone antenna.