Dual-frequency dielectric resonant antenna based on low sintering temperature Li5Mg4NbTiO11-LiF microwave dielectric ceramics

Li 5 Mg 4 NbTiO 11 - x wt% LiF microwave dielectric ceramics were successfully developed using the solid state way. The phase structure, microstructure, Raman vibration, and microwave dielectric properties of LiF doped Li 5 Mg 4 NbTiO 11 ceramics were studied. The researches show that LiF doping can effectively decrease the sintering temperature of Li 5 Mg 4 NbTiO 11 ceramic. At x  = 6, the ceramic sintered at 860 °C show the best performance ( ε r  = 15.56, Q  ×  f  = 89,713 GHz, and τ f  = −40.48 ppm/°C) and is chemically compatible with Ag electrodes. In addition, a dual-frequency dielectric resonant antenna based on 6 wt% LiF-doped ceramics was designed, which has high gain (2.94 and 6.90 dBi) and efficiency (75.5 and 95.6 %) around the resonant frequency (2.4 and 6 GHz). The comprehensive results show that this material is not only a promising LTCC material, but also a viable candidate material for 5/6G applications.