Fractal Antenna Receives Patents for Invisibility Cloak and Absorptive Shielding

Fractal Antenna Systems has issued new patents, enabling the next generation of stealth-like invisibility, and absorptive shielding for commercial and defense applications. 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. According to 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 reductions.

Fractal absorbers have been known and recognized as important for many years. Cohen says it is outrageous and bizarre to see teams from PRC (China) claiming invention of fractal absorbers. According to him, they have received unusual attention for their alleged invention, under the premise of so-called super-materials. Fractal absorbers were discovered many years ago, at Fractal, and the new patent conclusively establishes fractal absorbers as an American invention that pre-dates others’ alleged invention, says Cohen.

When the patent application was withheld from publication, the Chinese unwittingly established credibility for the invention and its American uses. And, in Cohen’s 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 Fall.