ELECTROMAGNETIC RADIATION ABSORBER Russian patent published in 2001 - IPC

FIELD: acoustic chambers. SUBSTANCE: device possessing sound-absorbing properties and designed for use in frequency range of 20 to 30 000 MHz has ferrite substrate that carries dielectric matching layer with carbon filler which is, essentially, laminated structure built up of planar layers of different-density sound-absorbing material; layer density reduces with increase in distance from ferrite substrate. Fire-resistant inorganic material such as frothed basalt may be used as sound-absorbing material. Dielectric matching layers may have different carbon filler content which usually ranges between 0,06•10^-4 and 0,36•10^-4 parts by volume. EFFECT: facilitated manufacture. 1 dwg