According to Tian Hongliang, a researcher at Tsinghua University Institute of Electronic Engineering, the research was led by Professor Mei from Lanzhou University and Professor Cui Tiejun from Southeast University. By arranging the signal source around the object to be hidden, the detection of external signals can be offset, so as to realize the invisibility or deformation of the object, that is, the invisibility of the instrument. That is to say, when the radar detects an aircraft, it needs to transmit signals, and these signals are reflected back after hitting the aircraft. The radar can know the information of the aircraft through the reflected signals. This is equivalent to that when the detector detects an object, the signal source around the active stealth control object cancels or changes the signal detected by the detector, thus generating stealth. Or a person hides under the active invisibility cloak, which can't be detected by ordinary detectors, or what is detected is other set shapes, a dog or a snake.
May Zhong Lei said that although the object covered with "invisibility cloak" is invisible to the instrument, we can easily distinguish the existence of the object with the naked eye. People can see objects because the light emitted by objects enters the human eye. The reason why detection instruments can find objects is because objects block the passage of electromagnetic waves. "This process is like running water in a stream. When it passes a stone, it will bypass the stone and then close it as if it had never met a stone. " May Zhong Lei said that this makes the instrument show that the object does not exist, but to the naked eye, the object still exists.