RADIATIVE TRANSFER AND POWER CONTROL WITH FRACTAL METAMATERIAL AND PLASMONICS

• US 20170237300A1
• Filed: 05/01/2017
• Published: 08/17/2017
• Est. Priority Date: 10/01/2012
• Status: Active Grant

• Current Assignee: Fractal Antenna Systems Inc.
• Original Assignee: Fractal Antenna Systems Inc.
• Inventors: Cohen, Nathan
• Granted Patent: US 9,935,503 B2
• Time in Patent Office: Days
• CPC Class Codes: F28F 2245/06 having particular radiating, reflecting or absorbing features, e.g. for improving heat transfer by radiation
• CPC Class Codes: F28F 7/00 Elements not covered by group F28F1/00, F28F3/00 or F28F5/00
• CPC Class Codes: F41H 3/00 Camouflage, i.e. means or methods for concealment or disguise for vessels B63G8/34, B63G13/02 ; sound camouflage, i.e. simulating gun fire noise, F41A33/04; dummy or decoy targets F41J; chaff per se F41J2/00; ammunition for dispensing chaff F42B5/15, F42B12/70; radar absorbing fabrics H01Q17/005
• CPC Class Codes: G02B 1/002 made of materials engineered to provide properties not available in nature, e.g. metamaterials
• CPC Class Codes: G02B 5/008 Surface plasmon devices diffractive gratings with a pitch less than or comparable to the wavelength G02B5/1809; surface plasmons in integrated optics G02B6/1226; optical analysis of materials by means of surface plasmons G01N21/553
• CPC Class Codes: H01Q 17/008 with a particular shape H01Q17/007 takes precedence
• CPC Class Codes: H02J 50/12 of the resonant type

Abstract

Systems according to the present disclosure provide one or more surfaces that function as heat or power radiating surfaces for which at least a portion of the radiating surface includes or is composed of “fractal cells” placed sufficiently closed close together to one another so that a surface (plasmonic) wave causes near replication of current present in one fractal cell in an adjacent fractal cell. A fractal of such a fractal cell can be of any suitable fractal shape and may have two or more iterations. The fractal cells may lie on a flat or curved sheet or layer and be composed in layers for wide bandwidth or multibandwidth transmission. The area of a surface and its number of fractals determines the gain relative to a single fractal cell. The boundary edges of the surface may be terminated resistively so as to not degrade the cell performance at the edges.

Claims

1. An electromagnetic radiative system providing gain over a prescribed bandwidth, the system comprising:

a plurality of fractal-cell layers, each layer having a fractal plasmonic surface (FPS) including close-spaced fractal cells, wherein the plurality of fractal-cell layers is operative to produce a gain increase, and wherein the gain increase acts as a lens-like effect on a separate electromagnetic source.

2. The electromagnetic radiative system of claim 1, wherein the fractal cells lie on a flat layer and the system comprises one or more flat layers for wide bandwidth or multibandwidth transmission.

3. The electromagnetic radiative system of claim 2, wherein each layer holding a FPS comprises fractal cells of different size and shape than those of another layer.

4. The electromagnetic radiative system of claim 1, wherein the fractal cells lie on a curved layer and the system includes one or more curved layers for wide bandwidth or multibandwidth transmission.

5. The electromagnetic radiative system of claim 4, wherein each layer holding a FPS comprises fractal cells of different size and shape than those of another layer;

6. The electromagnetic radiative system of claim 2, wherein the fractal cells comprise a plurality on the area of each layer, but do not fully populate the layer area.

7. The electromagnetic radiative system of claim 2, wherein the absence of fractal cells on the layer constitutes concentric shells as rings.

8. The electromagnetic radiative system of claim 4, wherein the fractal cells constitute a plurality on the area of each layer, but do not fully populate the layer area.

9. The electromagnetic radiative system of claim 4, wherein the absence of fractal cells on the layer constitutes concentric shells as rings.