The article concerns the problems connected with electromagnetic compatibility. Two methods of measuring attenuation of thin absorbent materials used for electromagnetic screens are described here. The measurements have been conducted in a coaxial measuring line, which provides a large broad band of realized measurements. The first method is based on measuring the signal level with a measuring receiver at the output of the coaxial measuring line. The second method is based on measuring parameters of S matrix with the use of a network analyzer, which allows to determine the amount of absorbed energy and reflected by a sample. Exemplary measurements of attenuation have been conducted for two samples in the frequency range from 200 MHz to 5200 MHz.
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