Market Overview

Breakthrough Invisibility Cloak and Absorber Technologies Receive Patents


Fractal Antenna Systems, Inc. today confirmed the issuance of its newest
patents, enabling the next generation of stealth-like invisibility, and
absorptive shielding, with commercial applications as well as defense

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Fractal absorber is paper thin and absorbs radio waves over a large frequency range. Removal of part ...

Fractal absorber is paper thin and absorbs radio waves over a large frequency range. Removal of part of resistive layer shows fractal resonator. Patent 10,030,917. (Photo: Business Wire)

The firm pioneered and invented invisibility cloaks and holds both the
‘source' patent (8,253,639) and the related comprehensive IP portfolio.

Recently issued patent 10,027,033 is a continuation of that state of the
art innovation. It discloses a novel means of turning invisibility
cloaks on and off, by changing the characteristics of a boundary layer.
Notes inventor Nathan Cohen: "The person or sensor inside the cloak is
thus no longer blind." Cohen asserts that not being able to sense the
outside has previously been the number one impediment to the use of
invisibility cloaks.

The newest patent, 10,030,917, describes related technology where
electromagnetic energy is absorbed by fractal-based metamaterials.
Called ‘fractal absorbers', the innovation uses evanescent waves to
divert such impinging energy off to the sides, where it is absorbed in a
resistive layer. Previously, absorbers relied on the thickness, not the
width, of materials to accomplish this. Now these very thin fractal
absorbers accomplish the same result with dramatic thickness and weight

Fractal absorbers have been known and recognized as important for many
years. Explains Cohen: "It is outrageous and bizarre to see teams from
PRC (China) claiming invention of fractal absorbers. They have received
unusual attention for their alleged invention, under the premise of
so-called ‘supermaterials'. Fractal absorbers were discovered many years
ago, at this firm, and the new patent conclusively establishes fractal
absorbers as an American invention that pre-dates others' alleged
invention: we didn't give it to them. We held it under wraps, waiting
for this patent issuance. The patent application was withheld from
publication. Ironic for them, the Chinese have unwittingly established
credibility for our invention and its American uses. And, in my opinion,
they are now very far behind in the game."

Cohen sees a variety of commercial applications for fractal absorbers,
whose broad bandwidths and ultra-thinness are especially sought.
Demonstrations targeting specific applications will be completed in the


Fractal Antenna Systems, Inc. (
supplies products and solutions for the world's most demanding wireless,
electromagnetic, and electronic applications. Backed by over five dozen
U.S., and international patents, plus dozens of patents pending, FRACTAL
is the recognized pioneer in fractal technology, with extensive research
and field experience over 23 years in business. The company is a
privately held and headquartered in Bedford, Massachusetts, USA.

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