Chinese new stealth coat protects their aircraft against anti-stealth radars.

"Stock image showing a pair of Chinese J-20 stealth fighters." (Interesting Engineering, Paper-thin power: China claims its new stealth coating blinds anti-stealth radars)

The new stealth coat protects Chinse stealth fighters against anti-stealth systems. There are two ways to make the anti-stealth radar. The first is to use some very short wavelengths. The problem is that the small structures in stealth materials scatter those short wavelength radars. Another way is to create very long-wavelength radar impulses. 

In that system, the idea is that the anti-stealth system treats the target surface as an entirety. So, very long wavelength radars make the radio impulse jump over the small structures in the stealth materials. The new stealth coat will pull radio impulses into itself. And then turn that thing into the heat energy. 

And probably. There is a system. That conducts the heat energy into the stealth plane's body. That gives a lower IR signature. The new lidar systems replace radio signals using visible light. The laser scanners are vulnerable to bombs and missiles that aim at that optical energy source. The counter laser waves can prevent the lidar from reaching the aircraft's body. 

And there a heat exchanger removes that heat from the system. Another way to make stealth planes is to use the fiber-looking material there the radar impulses jump between those sticks.

Some stealth material aims the radio waves in different directions. And that denies the radar transmitter to see echo. The superconductors would be excellent tools for stealth technology. The thing that causes radar echo is the hall effect. 

The material stores radar energy into it. When the energy level in the material is high enough, that causes radar echo or energy transfer into the lower energy space. If the stealth material lets radio waves through it without resistance that means the material is invisible to radar. This is the reason for research on the room- or high-temperature superconducting materials. 

The problem with stealth materials is this. The material can absorb or store electromagnetic waves for only a limited time. The material stores that energy and when its energy level is high enough, it sends a counter wave to the radar. The problem is that the radar "fills" material and then that material sends radar echo. The problem is where the material or aircraft can put that energy. 

Then the system can conduct that energy. Into some kind of capacitor. In some stealth materials, the system keeps the electronegative structures in the stealth aircraft. And then. Those electronegative components pull radar waves into somewhere where the plane can store them. Or where the plane can conduct that energy out from it. 

There is been intensive research on stealth materials. There are tests about materials that absorb radio signals. The problem is that the material must put that energy into somewhere. Or the radio waves will destroy the plane. There is research about the systems. That conducts electricity that the radio waves form into the water tank. There are two tanks. Saltwater tank and capacitor, Leyden jar that stores electricity.

When there is too much electricity the system launches the Leyden Jar or water from it. And that allows the plane to remove electromagnetic energy. In other versions, the system creates hydrogen ions that can transfer radio signals into themselves. There are also tested active jammers that give counterwaves that deny the echo from the object. The problem is that the system must operate with precisely the right wavelength and accuracy. It must send counterwaves precisely right time. 

https://interestingengineering.com/innovation/china-new-stealth-coating-blinds-radars

https://www.scmp.com/news/china/science/article/3287546/new-coating-can-make-chinas-stealth-aircraft-invisible-anti-stealth-radar-study?module=Science&pgtype=section

https://en.wikipedia.org/wiki/Hall_effect