In China, they are working on stealth technology for space. There are many ideas, from painting satellites black, coating them with graphene, to moving them in the radar shadow of space debris. The main problem is not to make the satellite invisible, but to hide it from radars.
It is noted that the technologies that are used for flights over the Earth, for example, for stealth aircraft, will not be suitable here. Also, a number of coatings cannot withstand vacuum, cosmic rays and sudden changes in temperature.
In the new work, scientists have created a multilayer honeycomb structure based on composite materials with the inclusion of paper and plastic, capable of absorbing up to 80% of radar radiation in the entire frequency range used today.
The weight of the coating has been reduced to 6 kg per 1m2, which is significantly less than that of the existing modern materials for radar invisibility.
They also created a transparent radar stealth coating for solar panels with a thickness of only 3 mm, but it remains resistant to bending and withstands impacts.
The researchers plan to continue working in this direction.