Microwave Dielectric Properties of 0.93(Mg_0.95Co_0.05)TiO₃–0.07CaTiO₃ for Application in Patch Antenna

Abstract

In this paper, the microwave dielectric properties of 0.93(Mg0.95Co0.05)TiO3–0.07CaTiO3 ceramics have been studied for patch antenna design. CuO was selected as liquid sintering aids to lower the sintering temperature of 0.93(Mg0.95Co0.05)TiO3–0.07CaTiO3. It is found the X-ray diffraction pattern exhibited no phase difference at addition levels below 1.0 wt %. The maximum values of dielectric constant and quality factor Q ×f can be obtained in samples with 0.25 wt % CuO additives sintered at 1190 °C for 4 h. A near-zero temperature coefficient of resonant frequency (τf) was measured for 0.93(Mg0.95Co0.05)TiO3–0.07CaTiO3 ceramics with 0.25 wt % CuO sintered at 1190 °C for 4 h. The measurement result of the patch antenna at 2.53 GHz has been presented. Using this technique, a 0.21% bandwidth (return loss < -10 dB) of center frequency and a temperature variation of the resonance frequency smaller than 0.4% have been achieved.

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