Dielectric properties of Nd(Ti0.5W0.5)O4 ceramics at microwave frequency for application in hybrid dielectric resonator antenna suitable for LTE/5G

The microwave dielectric properties of Nd(Ti0.5W0.5)O4 ceramics were examined with a view to their application in mobile communication. The Nd(Ti0.5W0.5)O4 ceramics were prepared using the conventional solid-state method. A maximum density of 6.65 g/cm3 was obtained for the Nd(Ti0.5W0.5)O4 ceramic, sintered at 1500 °C for 4 h. Dielectric constants (εr) of 15.4–19.4 and quality factor (Q×f) of 3,600–11,100 GHz were obtained at sintering temperatures in the range 1425–1525 °C for 4 h. A Nd(Ti0.5W0.5)O4 ceramic that was sintered at 1500 °C for 4 h had a dielectric constant (εr) of 19.4, a quality factor (Q×f) of 11,100 GHz, and a temperature coefficient of resonant frequency (τf) of −48 ppm/°C. The hybrid dielectric resonator antenna consisted of a cylindrical high dielectric constant dielectric resonator and a rectangular slot was implemented. The hybrid dielectric resonator antenna had two resonant frequencies. The lower and higher resonant frequencies were associated with the rectangular slot and dielectric resonator, respectively. Parametric investigation was carried out using simulation software. The proposed hybrid dielectric resonator antenna had good agreement between the simulation results and the measurement results. The proposed hybrid dielectric resonator antenna has frequencies cover sub-6 GHz band and LTE band 3. A 10.2% bandwidth (return loss <10 dB) of 1.77 GHz, and a 9.9% bandwidth (return loss <10 dB) of 3.43 GHz was implemented successfully for application in sub-6 GHz band and LTE band 3.