Preparation of temperature-stable 0.8MgTiO₃-0.2Mg₂SiO₄-0.06CaTiO₃ microwave dielectric ceramics for unilateral radiating dielectric resonator antenna without ground plane

Unilateral radiating antennas are widely studied due to their ability to provide lateral or unidirectional radiation patterns, which are especially suitable for indoor and office Wi-Fi router applications. In this letter, a unilateral radiating rectangular dielectric resonator antenna (DRA) without a ground plane is proposed. A temperature stable low-loss 0.8MgTiO₃-0.2Mg₂SiO₄-0.06CaTiO₃ (MT-MS-CT) composite ceramic prepared via solid-state reaction and sintered at 1380 °C is utilized for the proposed DRA. Notably, the MT-MS-CT composite ceramic shows good dielectric performance with a permittivity of ϵ r ∼ 13 , a quality factor of Q × f 0 ∼ 115 , 000 , Q = 1/dielectric loss, f₀ = 8.6 GHz, and a temperature coefficient of resonant frequency T C F ∼ + 4.6 ppm / ° C . Its unilateral radiation pattern is based on the complementary magnetic dipole and electric dipole, where the excited dominant TE₁₁₁ mode of the rectangular DRA serves as the magnetic dipole and a probe acts as an electric dipole. The proposed prototype antenna fabricated using the composite ceramic has a unilateral radiation pattern with wide impedance bandwidth, reasonable gain, and radiation efficiency of 95%.