Preparation (soft polyurethane foam graphite)‎ composites for microwave absorption in X-band frequency

الملخص EN

The aim of this study is to produce sheets of microwave absorbing materials using Graphite in different concentrations (5wt.

% - 40wt.

%) and dispersed in a Soft Polyurethane Foam matrix.

The study also aims to measure the electromagnetic properties (transmission, return loss and relative absorbed power) of these sheets in the x-band frequency range (8.5–12.4) GHz using closed waveguide technique .It is found that the lower value of Return Loss is (-30dB) in less than (5wt.

%) graphite loading, and the relative absorbed power are close to (5 %) of the incident radiation in all frequencies.

The higher value of the return loss is (-18dB) in (30wt.

%) Graphite loading, and the relative absorbed power value is close to (25 %) of the incident radiation in 10GHz.

These composites are very useful in producing the EMI Shielding, absorbing sheets and microwave anechoic chambers.