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Researchers at the Department of Electrical and Computer Engineering at the University of Toronto used the principle of electromagnetic fields to demonstrate for the first time the effectiveness of a new type of "stealth" technology that is thin, scalable, and adaptable to different types and sizes of objects. The relevant research results were published in Physical Review X.
The development of this functional "stealth" technology began around 2006, but the early system was large and cumbersome. For example, if you want to cover up a car, in practice you will have to use a lot of layers of super material to wrap the car in order to form an effective “shield†to block electromagnetic radiation. The huge size and rigid practices make it difficult to really apply.
Professor George of the University of Toronto and his Ph.D. student, Michael, designed the radiating electromagnetic field by placing tiny antennas around the object to cancel or "absorb" all electromagnetic scattering from the object. Michael said: "We took the electrical engineering approach. What's even more pleasing is that it is very practical."
Imagine a mail box standing on the street, when light falls on it and bounces back into your eyes, you see it. When a radio wave strikes it and bounces back to the radar detector, it can be detected. The new system wrapped the postbox in a tiny layer of antenna radiation, counteracting any wave that might bounce back. As a result, the radar will not be able to detect the post.
Michael explained: “This is a very simple method that is different from the past. There is no need to cover the stealth object with a thick shell of super material, but just surround it with a tiny antenna so that it is radially inward. A field that counteracts the reflection of the object."
The researchers used some loop antennas in the experiment to effectively “disappear†a metal cylinder in the detection of radio waves. Current antenna coils must be manually tuned to accommodate the electromagnetic frequencies that need to be cancelled, but they can be printed and become planar. In the future, they can be used as sensors or as transmit antennas. In reality, they can adapt to different wavelengths, very much like Noise reduction headphones technology.
As far as applications are concerned, this stealth technology can be used to "eliminate" obstacles other than in the military field, for example, to hide buildings that interfere with cellular network base station signals, allowing signals to pass freely. In addition, the system can also change the signals of invisible objects to make them appear larger or smaller, and even shift to space.
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