Abstract
In recent days, various microwave absorbers are used for electromagnetic interference and compatibility measurements in anechoic and semi-anechoic chambers. The authors have synthesized three different polymer composites of epoxy resin modified by urea formaldehyde and silicon urea formaldehyde of different wt%. The samples were made as small films of specific dimension in order to test them in the X-band frequency range by inserting them in the flange. The performance characteristics of samples were carried out by the transmission/reflection method using a vector network analyzer R&S: ZVT8. The results are analyzed at the end for the suitability of the material in the X-band and is observed that the urea formaldehyde provides better reflection co-efficient over a larger bandwidth.
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