New absorbing materials for applications in decimeter and millimeter wavelengths ranges

The results of tests of the several absorbing materials in the millimeter band are presented. It is shown that at frequencies 140 GHz the absorbing-diffusing materials decrease the reflection from the metallic plate by a value of 34 dB for wide angles range. For the equipment of anechoic chambers there were developed the versions of materials with the lowered combustibility and improved operating characteristics, including the material, closed with a case, laminated by polyethylene fiberglass fabric. There were investigated the composite materials on the basis of magnetoamorphous and nano-crystalline alloys of Fe-Si-B type for 300-1500 MHz frequency region. The two-layered material provided to reduction in the reflection by a value of 10.. .22 dB in 400-800 MHz frequency band.