Experimental and numerical studies of dielectric properties of BaTiO 3-platinum composites at microwave frequencies

The conductor loading method has been used for creating a lossy dielectric material with a desired loss tangent. This method may also be applicable for developing high dielectric constant materials. In this paper, we will present the experimental results of the dielectric properties of BaTiO3 and BaTiO3-platinum (BaTiO3-Pt) composites. These composite materials were designed to increase the real part of the effective dielectric constant at high frequency. Three different platinum volume fractions were used, 3, 5 and 10%, to make BaTiO3 -Pt composites, in addition to a pure BaTiO3 material. To characterize the BaTiO3-Pt composites, microwave frequency measurements were conducted using the waveguide transmission technique. The experimental and numerical results verify that it is possible to increase the dielectric constant using the conductor loading method. © 2005 IEEE.