Radiative transfer and power control with fractal metamaterial and plasmonics

Patent metadata

Field	Value
Publication number	US-9638479-B2
Application number	US-201615201888-A
Country	US
Kind code	B2
Filing date	Jul 5, 2016
Priority date	Oct 1, 2012
Publication date	May 2, 2017
Grant date	May 2, 2017

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.

First claim

What is claimed is:

1. An electrical resonator system, comprising:
a plurality of concentric electrical resonator shells, each shell including a substrate having first and second surfaces and a close-packed arrangement of electrically conductive material formed on the first surface, wherein the closed-packed arrangement comprises a plurality of self-similar electrical resonator shapes and is configured to operate at a desired passband of electromagnetic radiation; and
wherein the close-packed arrangements of at least two antenna shells are different in size and/or shape;
wherein the electrical system is configured and arranged so that radiation incident on the system from a given direction has an intensity on a point-by-point basis such at each respective antipodal point, relative to an object placed at the center of the system, the radiation has the same or similar intensity; and
wherein the antenna system is configured and arranged so that radiation incident on the system from a direction in cylindrical coordinates has the same or similar intensity at the antipodal point after having traversed the antenna system.

2. The system of claim 1 , wherein said passband is about 2:1.

3. The system of claim 2 , wherein said passband is about 3:1.

4. A fractal based scatterer comprising:
a shell composed of flexible substrate in the shape of a band joined in a cylindrical shape having a conductive coating with self-similar-shaped cutouts, wherein the scatterer produces a greater radar cross section for its physical size than would otherwise be produced by its physical size alone.

5. The scatterer of claim 4 , wherein the substrate is polyimide.

6. The scatter of claim 4 , wherein the scatter is operational over a range of about 500 MHz to about 1.3 GHz.

7. The scatter of claim 4 , wherein the scatter provides a dynamic range of about less than 10 to about more than 4.

Assignees

• Fractal Antenna Systems Inc

Inventors

• Cohen Nathan

Classifications

• F28F2245/06

  having particular radiating, reflecting or absorbing features, e.g. for improving heat transfer by radiation · CPC title

• G02B5/008

  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 title

• G02B1/002

  made of materials engineered to provide properties not available in nature, e.g. metamaterials · CPC title

• H01Q17/008

  with a particular shape (H01Q17/007 takes precedence) · CPC title

• H02J50/12

  of the resonant type · CPC title