Microwave Dielectric Properties of the $(Na_{1/2}Sm_{1/2})TiO_3$ -$(Li_{1/2}Nd_{1/2})TiO_3$ Ceramics for mobile communication

이동통신용 $(Na_{1/2}Sm_{1/2})TiO_3$ -$(Li_{1/2}Nd_{1/2})TiO_3$ 세라믹스의 마이크로파 유전특성

The microwave dielectric properties of (Na.$_{1}$2//Sm$_{1}$2/)TiO$_3$and (Li$_{1}$2//Nd$_{1}$2/)TiO$_3$ceramics were investigated. Dielectric constant quality factor and temperature coefficient of resonant frequency of (Li$_{1}$2//Nd$_{1}$2/)TiO$_3$ceramics sintered at 145$0^{\circ}C$ for 2 hours were 86.2, 2780(at 3.8GHz) and 215ppm/$^{\circ}C$respectively. The solid solution of X(Na.$_{1}$2//Sm$_{1}$2/)TiO$_3$-(1-X)(Li$_{1}$2//Nd$_{1}$2/)TiO$_3$increased delectric constant and quality factor were decreased. Whereas temperature coefficient of resonant frequency was optimized to zero at the composition of 0.6(Li$_{1}$2//Sm$_{1}$2/)TiO$_3$-0.4(Li$_{1}$2//Nd$_{1}$2/)TiO$_3$where dielectric constant and quality factor were 86.2, 95-(at 3.8GHz) respectively. Also band-pass filters made of this material were examined.