Researchers at Fractal Antenna Systems have produced an antenna with a wideband microwave invisibility cloak. However, you can still see the antenna with your eyes, as its unique properties occur at microwave frequencies, well below the visible spectrum.
"In 2008, Chinese researchers said it was impossible to make a wideband invisibility cloak," writes Nathan Cohen, Fractal Antenna's CEO and chief inventor. "We not only did it, but reduced the number of cloak layers, and, most importantly, made a cloak you can see out of. That means a sensor, for example, can be made to disappear into the background over a wideband, but still be able to see what's outside. These attributes are really the 'holy grail' of cloak designs, and strongly point towards a bright future for invisibility science."
Cohen added that his involvement in amateur radio was a factor in developing the device.
"I have a Ph.D. in astrophysics and am a retired college professor," he said. "But the experience I gained as a young ham radio operator was invaluable in helping me make knowledge connections to make the cloak work. That's, in part, why my research group did this first, and why we continue to lead in innovation in fractal electronics, both in basic research and application to products."
Here's a video showing the antenna and how it works. Additional information used in this article is from Nanotechwire.com.
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Doug Lung is one of America's foremost authorities on broadcast RF technology. As vice president of Broadcast Technology for NBCUniversal Local, H. Douglas Lung leads NBC and Telemundo-owned stations’ RF and transmission affairs, including microwave, radars, satellite uplinks, and FCC technical filings. Beginning his career in 1976 at KSCI in Los Angeles, Lung has nearly 50 years of experience in broadcast television engineering. Beginning in 1985, he led the engineering department for what was to become the Telemundo network and station group, assisting in the design, construction and installation of the company’s broadcast and cable facilities. Other projects include work on the launch of Hawaii’s first UHF TV station, the rollout and testing of the ATSC mobile-handheld standard, and software development related to the incentive auction TV spectrum repack.
A longtime columnist for TV Technology, Doug is also a regular contributor to IEEE Broadcast Technology. He is the recipient of the 2023 NAB Television Engineering Award. He also received a Tech Leadership Award from TV Tech publisher Future plc in 2021 and is a member of the IEEE Broadcast Technology Society and the Society of Broadcast Engineers.