Microwave dielectric properties of 0.95MgTiO3–0.05CaTiO3 for application in dielectric resonator antenna

In this paper, the microwave dielectric properties of 0.95MgTiO3–0.05CaTiO3 ceramics have been studied for application in dielectric resonator antenna design. ZnO was selected as liquid sintering aids to lower the sintering temperature of 0.95MgTiO3–0.05CaTiO3. The X-ray diffraction pattern exhibited single phase for ceramics up to 1.0 wt.%. The maximum dielectric constant was obtained for samples after 0.25 wt.% ZnO addition and 1290 °C for 4 h sintering. A near-zero temperature coefficient of resonant frequency (τf) of −4.9 ppm/°C was obtained for 0.95MgTiO3–0.05CaTiO3 ceramics with 0.25 wt.% ZnO sintered at 1250 °C for 4 h. The dielectric resonator antenna measured at 9.58 GHz exhibited a 5.92% bandwidth (return loss <−10 dB) of center frequency.