Influence of the Addition of CaTiO3 on the Microwave Dielectric Properties of the BaMoO4 Matrix

This work presents the study of the dielectric properties in the microwave region (MW) of BaMoO4 ceramic and composites with CaTiO3 (CTO). The BaMoO4 matrix was synthesized by solid state reaction and characterized by X-ray diffraction. Ceramic composites were obtained by adding 20-80 mol% of CTO in the BaMoO4 matrix. The Silva-Fernandes-Sombra method was used to measure the resonant frequency temperature coefficient (tau f), and the BaMoO4 composite with 20% CTO showed an adequate value of relative dielectric permittivity (epsilon r = 8.90), low dielectric loss tangent (tan delta = 9.89.10(-4)) and tau f close to zero (tau(f) = 3.48 ppm C-1). BMO and its composites were applied as dielectric resonator antennas, and their far-field parameters were obtained through numerical simulation.