In this paper, we studied the effect of tungsten carbide (WC) content on the dielectric properties of WC/Al 2 O 3 composite containing 20%, 30% and 40% by volume of WC. The results show that the permittivity of the WC/Al 2 O 3 composite increases progressively with increasing WC content and decreases slightly with increasing frequency in both X and Ku band. Composites reinforced with 40% by volume of WC have better dielectric properties than composites that are less reinforced. A good agreement between the results of numerical simulations and published measurements was obtained in the X-band.