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

In this paper, the microwave dielectric properties of 0.95MgTiO(3)-0.05CaTiO(3) ceramics have been studied for application in dielectric resonator antenna design. ZnO was selected as liquid sintering aids to lower the sintering temperature of 0.95MgTiO(3)-0.05CaTiO(3). 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 degrees C for 4 h sintering. A near-zero temperature coefficient of resonant frequency (tau(f)) of -4.9 ppm/degrees C was obtained for 0.95MgTiO(3)-0.05CaTiO(3) ceramics with 0.25 wt.% ZnO sintered at 1250 degrees 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. (c) 2008 Elsevier B.V. All rights reserved.