Design of microwave dielectric resonator antenna using MZTO–CSTO composite

This paper presents the design of a cylindrical dielectric resonator antenna (DRA) using a nearly temperature stable dielectric composite material. By the combination of compounds with positive and negative temperature coefficient, a dielectric composite series (1 − x)(Mg0.95Zn0.05)TiO3 − x(Ca0.8Sr0.2)TiO3 has been developed. The structural and morphological properties of 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. Microwave dielectric properties of the composite samples have been investigated using the TE01δ dielectric resonator method. Relative permittivity (ɛr) of 21.9, dielectric loss tan δ of 0.0002 and temperature coefficient of resonant frequency (τf) of −0.15 ppm/°C have been obtained for the x = 0.08 sample, which was used for designing the DRA. The DRA resonates at 4.6 GHz frequency and offers the bandwidth of 315 MHz. The characteristics of proposed DRA have been simulated using the Ansoft high frequency structure simulator (HFSS). Comparison between the simulated and measured results shows a reasonably good agreement.