Methods and apparatus for enhanced radiation characteristics from antennas and related components

• US 9,620,853 B2
• Filed: 05/18/2015
• Issued: 04/11/2017
• Est. Priority Date: 04/15/2009
• Status: Active Grant

• Current Assignee: Fractal Antenna Systems Inc.
• Original Assignee: Fractal Antenna Systems Inc.
• Inventors: Cohen, Nathan, Chin, Michael
• Primary Examiner(s): SMITH, GRAHAM P
• Application Number:
  US14/714,844
• Publication Number:
  US 20150255861A1
• Time in Patent Office: 694 Days
• Field of Search: 343899
• CPC Class Codes: H01L 31/042 PV modules or arrays of single PV cells supporting structures for PV modules H02S20/00
• CPC Class Codes: H01Q 1/288 Satellite antennas
• CPC Class Codes: H01Q 15/0093 having a fractal shape
• CPC Class Codes: H01Q 19/00 Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic combination of horns with slotted waveguide array H01Q13/0233
• CPC Class Codes: H02S 99/00 Subject matter not provided for in other groups of this subclass
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy

Abstract

Aspect of the present disclosure are directed to methods and apparatus producing enhanced radiation characteristics, e.g., wideband behavior, in or for antennas and related components by providing concentric sleeves, with air or dielectric material as a spacer, where the sleeves include one or more conductive layers, at least a portion of which includes fractal resonators closely spaced, in terms of wavelength. A further aspect of the present disclosure is directed to surfaces that include dual-use or multiple-use apertures. Such aperture engine surfaces can include a top (or first) layer of antenna arrays, a middle (or second) layer of a metal-fractal backplane player, and a third (or bottom) layer for solar cell or solar oriented power collection.

Claims

1. An antenna system configured to operate over a predetermined frequency range from a first frequency (f₁) corresponding to a first wavelength (λ

₁) to a second frequency (f₂) corresponding to a second wavelength (λ

₂), wherein the second wavelength is shorter than the first wavelength, the system consisting essentially of;

a plurality of nested sleeves, wherein each sleeve includes one or more layers of dielectric substrate having a conductive array of fractal resonators disposed thereon, wherein the resonators of each sleeve are separated by a non-zero distance corresponding, when the system is operating at the first frequency (f₁) corresponding to the first wavelength (λ

₁), to less than ⅕

λ

₁, wherein each of the plurality of nested sleeves is held by a non-electrically-conductive frame and separated from each other sleeve by a non-zero radial distance and not galvanically connected to any other sleeve over that distance;

wherein the predetermined frequency range is dependent upon the physical dimensions of the sleeves and resonators; and

wherein, in operation, the system produces a 3 dB passband of 2;

1 or greater.

2. The system of claim 1, wherein the one or more sleeves comprise a plurality of sleeves that are separated by an air gap or dielectric material.

3. The system of claim 2, wherein the plurality of sleeves comprises a pair of sleeves, and wherein the adjacent separations of resonators are ⅛

λ

₁ at the first frequency (f₁).

4. The system of claim 1, wherein the one or more nested sleeves are configured around a pre-existing antenna for enhancement of the radiation characteristics of the antenna.

5. The system of claim 1, wherein the one or more nested sleeves are hemispherical.

6. The system of claim 1, wherein the one or more nested sleeves are cylindrical.

7. The system of claim 1, wherein the one or more nested sleeves are spherical.

8. The system of claim 1, wherein each sleeve is configured and arranged to be opened and closed to allow placement of an antenna within the respective sleeve.

9. The system of claim 1, wherein the conductive array of resonators comprises a second order or higher fractal.

10. The system of claim 9, wherein said fractal is selected from the group consisting of a Koch fractal, a Minkowski fractal, a Cantor fractal, a torn square fractal, a Mandelbrot, a Caley tree fractal, a monkey'"'"'s swing fractal, a Sierpinski gasket, and a Julia fractal.

11. The system of claim 9, wherein the fractal is selected from the group consisting of a contour set fractal, a Sierpinski triangle fractal, a Menger sponge fractal, a dragon curve fractal, a space-filling curve fractal, a Koch curve fractal, an Lypanov fractal, and a Kleinian group fractal.

12. The system of claim 1, wherein the one or more nested sleeves are configured and arranged for operation at K band, Ka band, or X-band.

13. The system of claim 1, wherein the one or more nested sleeves are configured as an antenna.

14. The system of claim 1, wherein the resonator shapes of one sleeve are about 1.5 cm on a side.