Microwave dielectric properties of (1 − x)Mg0.95Zn0.05TiO3–(x)Ca0.6La0.8/3TiO3 ceramic composites

In this paper the structural and microwave dielectric properties of the (1 − x)(Mg0.95Zn0.05)TiO3–(x)(Ca0.6La0.8/3)TiO3 ceramic composites have been investigated with the variation of x   as well as sintering temperature. The grown samples have been characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray (EDX) spectroscopy analysis. The Rietveld analysis of the XRD data has been carried out for structure refinement of the phases. The relative permittivity (∊r)(∊r), quality factor (Q) and temperature coefficient of resonant frequency τf of the grown samples have been thoroughly studied. Out of all samples of this series, the sample with x = 0.21 shows excellent dielectric properties with ∊r∼26.26∊r∼26.26, Q × f ∼ 60,738 GHz (at 6.44 GHz) and a nearly zero τf ∼ −0.8 ppm/°C. Two types of dielectric resonator antennas with different feeding mechanisms have been fabricated using this sample to study their performance. The experimental results have been compared with the simulated results obtained using Ansoft High Frequency Structure Simulator software.

► This report presents the microwave dielectric properties of (1 − x)MZT–(x)CLT samples.
► The 0.79MZT-0.21CLT composite sample shows a nearly zero τf ∼ −0.8 ppm/°C.
► A dielectric resonator antenna has been fabricated using 0.79MZT-0.21CLT sample.
► The probe fed DRA provides higher gain as compared to the microstrip line fed DRA.