1results about How to "Improve infrared stealth performance" patented technology

This invention belongs to the field of radar absorbing materials technology, and discloses a continuous alumina fiber reinforced alumina-based structure radar absorbing material and its preparation method. The radar absorbing material includes a composite material body, a reflective layer disposed on the back of the composite material body, a frequency-selective surface layer disposed on the front of the composite material body, and at least two metamaterial layers embedded within the composite material body; the composite material body is a continuous alumina fiber reinforced alumina ceramic matrix composite material with a density of 2.8~3.0 g / cm³. 3 The reflective layer is a continuous conductive layer; the frequency-selective surface layer is a discontinuous conductive layer composed of periodically arranged conductive patterns; the metamaterial layer is located between the reflective layer and the frequency-selective surface layer and has a periodic resistance pattern. This improves the operating temperature and mechanical properties, reduces the material thickness, and achieves wide-band absorption, with an infrared emissivity of no more than 0.3 in the 3~5μm band, thus enhancing infrared stealth capabilities.