via the ARRL: Company Established by Inventor Nathan Cohen, W1YW, Advances Cloaking Technology

Fractal Antenna Systems, Inc., established by noted radio amateur and inventor Nathan Cohen, W1YW, continues to stretch technological boundaries of belief. In an August 15 news release, the firm confirmed the issuance of its newest patents that will enable the next generation of stealth-like invisibility and absorptive shielding. The technology has both commercial and military applications. The firm pioneered and invented invisibility cloaks and holds both the “source” patent (8,253,639) and the related comprehensive intellectual property 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.

“The person or sensor inside the cloak is thus no longer blind,” Cohen said. He explained that not being able to sense the outside has previously been the top 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 reductions in thickness and weight.

via American Radio Relay League | Ham Radio Association and Resources