Low sintering temperature high permittivity ceramic composites for dielectric loaded microwave antennas

High dielectric constant and high‐Q in microwave ceramics of SrTiO3 co‐doped with aluminum and niobium

“…Microwave dielectric properties were carried out by a network analyzer (8720ES; Agilent, Santa Clara, CA) in the frequency range of 2-4.5 GHz. The dielectric constant (e r ) and quality factor (Qf) values were measured by Hakki-Coleman's method using TE 011 resonant modes, 5 and the temperature coefficient of resonant frequency (s f ) values were evaluated by the resonant-cavity method. 13 The leakage current was analyzed by a high resistance meter (Agilent4339B, Santa Clara, CA) at room temperature.…”

“…[1][2][3] To further minimize the size of microwave devices, it is urgent to increase the dielectric constant (e r ) and reduce the dielectric loss of microwave dielectric materials. 4,5 Therefore, the dielectric materials with high e r and quality factors (Qf) have been given much attention. Recently, high dielectric constant SrTiO 3 ceramics have been explored, 6,7 however, the relatively low Qf (~3000) severely limits their practical application.…”