The spectra of permittivity and permeability of the coaxial planar anisotropic carbonyl-iron (PACI) / paraffin and ferrite/ paraffin composite samples were studied. The coaxial ferrite/ PACI/ paraffin composite samples with different volume concentration of the two kinds of particles were prepared. Their permittivity and permeability were also tested and studied which show preferable characteristics can be obtained by appropriate combinations. Using epoxy-polyamide system as the matrix resin, a single-layer coating with a 10% volume concentration of both ferrite and PACI particles was prepared, which has a thickness of 1. 3 mm. The reflection loss was tested in the frequency range of 8 ~18 GHz, which shows a minimum reflection of -19. 7 dB with a -10 dB bandwidth of nearly 8 GHz.