Microwave characteristics of Sm(Co_(1/2)Ti_(1/2))O_3 dielectric resonators

摘要

The microwave dielectric properties of Sm(Co_(1/2)Ti_(1/2))O_3 ceramics have been investigated. Sm(Co_(1/2)Ti_(1/2))O_3 ceramics were prepared by conventional solid-state route. The dielectric constant values (epsilon_r) saturated at 23.5-25.5. The Q X f values of 21,500-76,000 (at 10 GHz) can be obtained when the sintering temperatures are in the range of 1300-1420 deg C. The temperature coefficient of resonant frequency tau_f was a function of sintering temperature. The epsilon_r value of 25.5, Q X f value of 76,000 (at 10 GHz) and tau_f value of - 16.3 ppm/deg C were obtained for Sm(Co_(1/2)Ti_(1/2))O_3 ceramics sintered at 1360 deg C for 4 h. For applications of high selective microwave ceramic resonator, filter and antenna, Sm(Co_(1/2)Ti_(1/2))O_3 is proposed as a suitable material candidate.