Preparation and dielectric properties of bismuth-based dielectric/PTFE microwave composites

PTFE-based microwave composites filled with bismuth-based pyrochlore dielectric ceramics were prepared by using the powder processing technology. The effect of ceramic powder content on dielectric properties was studied. The relative permittivity was also predicted using percolation theory. The results indicated that as the content of ceramic powder increased, both the relative permittivity and dielectric loss of composites increased, showing excellent frequency in a wide spectral range. The theoretical result predicted by percolation theory is in good agreement with the experimental data.