Fabrication of High Radiation Efficiency Dielectric Resonator Antenna Array Using Temperature Stable 0.8Zn₂SiO₄‐0.2TiO₂ Microwave Dielectric Ceramic

Abstract Array antenna is of great significance in realizing the Sub‐6 GHz fifth‐generation (5G) mobile communication systems, however, its utilization in the base station systems implementation is limited due to high power consumption. In this paper, a high radiation efficiency 4 × 4 cylindrical dielectric resonator antenna (CDRA) array fabricated using the temperature stable 0.8Zn₂SiO₄‐0.2TiO₂ composite ceramic is proposed. TiO₂‐doped Zn₂SiO₄ composite ceramics are synthesized by the conventional solid‐state method. Notably, 0.8Zn₂SiO₄‐0.2TiO₂ composite ceramic sintered at 1250 °C demonstrates excellent microwave dielectric properties with dielectric constant (ε_r ≈ 8.24), high‐quality factor (Q × f ≈ 35 000@8.08GHz), and the temperature coefficient of resonant frequency (TCF ≈ +4.6 ppm °C⁻¹). Moreover, the composite ceramic CDRA array is designed by exciting fundamental HE_11δ mode using the aperture coupling microstrip feeding network. The fabricated composite ceramic based 4 × 4 CDRA array has enhanced measured radiation efficiency of up to 87%, high gain of 17.85 dBi and is a promising candidate for utilization in Sub‐6 GHz 5G Base Station communications systems.