Preparation of (1-x) wt% (Mg_0.4Zn_0.6)₂SiO₄-x wt% CaTiO₃ composite ceramics and microstrip antenna application design

In this paper, (1-x) wt% (Mg_0.4Zn_0.6)₂SiO₄-x wt% CaTiO₃ composite ceramics were prepared by the solid-phase method. Adding CaTiO₃ reduces the sintering temperature of the ceramics, and the resonance frequency temperature coefficient of the composite ceramics can be brought close to 0 value by adjusting the x value in the (1-x) wt% (Mg_0.4Zn_0.6)₂SiO₄-x wt% CaTiO₃ composite ceramics. When the sintering temperature was 1175 °C, the 95 wt% (Mg_0.4Zn_0.6)₂SiO₄-5 wt% CaTiO₃ composite ceramics had the largest bulk density and relatively good dielectric (1 MHz) properties and microwave dielectric properties: ρ = 3.70 g/cm³, tanδ = 8.97 × 10⁻⁴, ε_r = 8.79, Q × f = 8959 GHz, and τ_f = −17.95 ppm/^oC. A microstrip patch antenna is designed. The simulation results show that the S11 parameter is −26.20 dB, the antenna gain is 5.50 dB, and the radiation efficiency is about 91.4 % when the resonant frequency is 2.45 GHz.