Wideband two-layer rectangular dielectric resonator antenna with (Zr0.8Sn0.2)TiO4-epoxy composite system

In this study, (Zr_0.8Sn_0.2)TiO₄-Epoxy composite have been synthesized and characterized at X-band frequencies. (Zr_0.8Sn_0.2)TiO₄ and Epoxy are mixed in five different ratios, i.e. 50:50, 60:40, 70:30, 80:20 and 90:10 with small amount of hardner (HY 951). The complex permittivity of the composite is measured at different microwave frequencies in X-band (8.2-12.4 GHz). It is found that the permittivity is reduced by increasing the percentage of epoxy in the composite. The optimized ratio of (Zr_0.8Sn_0.2)TiO₄ and Epoxy composite material have been used in two layer rectangular dielectric resonator antenna using coaxial excitation. The proposed design provides the measured impedance bandwidth of 58.7% (at resonance frequency 8.40 GHz) from 6.45 to 11.38 GHz for reflection coefficient (S₁₁) less than -10dB with absolute gain of 6.7 dB. The radiation patterns are consistent throughout the operational bandwidth.