Foams Absorbing Material Properties in Range of 38-52 GHz

The experimental results of measurements of electromagnetic wave reflection for some specimens of water foam for various time of their existence in free space for frequency range 38 - 52 GHz are presented. Thickness of specimens was 80 mm, the range of foaming ratio was from 69 till 173. It was possible to select separately the reflections from the front and rear interface of specimens. It has been shown that reflective characteristics of the foam specimens depend from the specimen foaming ratio and time of foam existence.