Ternary system rock salt Li3NbO4–Li2TiO3–MgO microwave dielectric ceramics with low loss for resonator antenna applications

A novel type of Li 3 NbO 4 –Li 2 TiO 3 - x MgO (LLM x , x  = 1–5) ceramics were prepared using the solid-state reaction method. When the sintering temperature is between 1180 °C and 1300 °C, the solid solution ceramics with cubic rock salt structure are obtained. As the MgO content increases, the ε r value decreases, the τ f value is basically constant, and Q×f exhibits ideal dielectric properties at x  = 4 ( ε r  = 15.26, Q×f  = 119,456 GHz ( f  = 9.97 GHz), τ f  = −35.9 ppm/°C). The Raman spectrum analysis was used to examine and understand the vibration mode and intrinsic mechanism of dielectric properties in ceramics. Additionally, a dielectric resonant antenna based on LLM 4 ceramic is fabricated with a resonant frequency of 7.23 GHz (|S 11 | = −45.6 dB), a higher gain and broadband width of 501 MHz.