Microwave radiation shielding effectiveness of composite liquid-containing materials in dependence on hygroscopic properties of the compounds

Abstract

Composite shielding materials based on capillary-porous matrixes impregnated with liquid solutions possessing resistive and dielectric losses for microwave electromagnetic radiation (EMR) are developed. Meeting the objectives the EMR attenuation obtained by the proposed materials can be higher than 12…19 dB, with the reflection level lower than -2…-8 dB in the frequency range 8…11.5 GHz. Study of liquid content dynamics upon the surface of non-sealed sample revealed that synthesis of 40…60 mass. % solution results in stabilization of liquid content of capillary-porous matrix at the level not lower than 100…108 % mass. of the initial value.