What exactly does the F22 rely on to become invisible?

Yes, the Czech Vera radar will be able to detect the F117 and F22 that are intended to be stealth fighters.

The stealth technology cannot completely guarantee the stealth of the fighter, but only reduces the reflective surface of the radar wave. With the use of more powerful radars, these stealth fighters will still show their original form.

The shape of the stealth should be very contradictory to the aerodynamic shape that allows the aircraft to fly well, and the aerodynamic layout of the aircraft will be lost if it maintains a good stealth appearance.

This problem has already been demonstrated in the F117 and B2 bombers, where American experts have had to sacrifice their maneuverability in order to demonstrate their excellent stealth performance, resulting in these planes being shot down if they are locked by aircraft or missiles.

In the Yugoslav War, the F117 was locked by a simple SA-2 anti-aircraft missile and did not escape, which was the earliest medium-range air-to-air missile, and the guidance performance was still very poor, which shows that the F117 maneuverability is average.

The stealth performance of the aircraft can not be done by a few scientists alone, he needs to conduct long-term wind tunnel experiments, and prototype aircraft flight experiments, etc., scientists' calculations can not take into account the impact of nature on it in reality, only after a large number of experiments to accumulate experience can there be a better development, so you say that it is not feasible to rely on scientists' plans.

From the perspective of an electronic engineer, this paper intends to make some progress on the level of electromagnetic stealth design methods in China and foreign developed countries (mainly the United States) according to some of the author's understanding

For the current stealth aircraft technology, the shape of the stealth technology plays a decisive role in the stealth effect, a MiG-21 that only relies on the comprehensive coating of absorbing materials will reduce the RCS from 3 to 1 at most, and then the material of the Niu X can not make the decimal point take a step forward, but only the F22 that uses the shape stealth technology Even if no absorbing paint is used, the RCS is still smaller, so the most important means of aircraft stealth is the shape of stealth. Appearance stealth is not taken for granted and can be copied, but depends on the development of computational electromagnetism, and if you look at the development level of computational electromagnetism in China, you can deduce the mastery of China's stealth technology. However, all the applications of stealth materials are dependent on electromagnetism, so this article only discusses experimental and numerical simulation methods in the design of stealth shapes.

There is an old Chinese saying, "If you want to do a good job, you must first sharpen your tools." "To design a successful stealth vehicle, advanced and mature design methods are indispensable. The fundamental purpose of these design approaches can be summed up in one sentence – to study the response (reflection properties) of the target to the incident electromagnetic wave.

There are only two ways to study the electromagnetic properties of the target: 1) experimental testing, and 2) theoretical calculations. This is just as good as the aerodynamic shape of the research target can be blown in a wind tunnel or analyzed with the help of computational fluid dynamics (CFD).

The United States is the only country in the world that has this technology.

References now; It is by virtue of its own material that it plays an anti-radar exploration. (The U.S. won't make this technology public.)

What materials how will we know! Even Russia does not have good stealth technology at the moment.

At present, there is a radar that can break the stealth of the F-22, and it seems that there is only one Czech Vera anti-stealth radar.

Let's rely on appearance and sound processing technology.

If the opposing plane can't see you. Or it's a delusion about you. This is both so-called stealth too.

The stealth effect is the same as B2.