In the experiment a kind of cement mortar capable of absorbing electromagnetic wave(EMW) was made of graphite,expanded perlite and Portland cement.The absorbing properties of this mortar were tested and the influence of thickness and the graphite content on the EMW reflectivity was studied by the arch reflecting method in the range of 2~18GHz.When the content of expanded perlite was 30%vol,the EMW absorption of the mortar containing 20%wt graphite was the best among the mortars of 15%wt,20%wt and 25%wt 200 ...
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