| Title |
Study on the Microwave Dielectric Properties and Dielectric Resonator Performance of the Mg_4Ta_2O_9 Ceramics with TiO_2 Addition |
| Authors |
최의선(Choi, Eui-Sun) ; 류기원(Ryu, Ki-Won) ; 이영희(Lee, Young-Hie) ; 김재식(Kim, Jae-Sik) |
| Keywords |
Mg_4Ta_2O_9 ; Microwave dielectric properties ; TiO_2 ; Dielectric resonator |
| Abstract |
The (1-x)Mg_4Ta_2O_9-xwt%TiO_2 (x=5 sim20) microwave dielectric ceramics were prepared by solid-state reaction method and sintered at 1450°C. According to the X-ray diffraction data, the Mg_4Ta_2O_9-xwt%TiO_2 ceramics had main phase of Mg_4Ta_2O_9 and MgTi_2O_5 peaks were added by increasing of TiO_2 addition. Microwave dielectric properties of the Mg_4Ta_2O_9-xwt%TiO_2 ceramics were influenced by MgTi_2O_5 phase and properties of TiO_2. There was a little decrement of the quality factor from 116,800GHz of pure Mg_4Ta_2O_9 to 100,100GHz of 15wt% TiO_2 added one. But there was excellent improvement in temperature coefficient of the resonant frequency (TCRF) by addition of 15wt% TiO_2. The dielectric constant quality factor and TCRF of the Mg_4Ta_2O_9-xwt%TiO_2 ceramics sintered at 1450°C were 13.08 sim16.41, 45,000 sim165,410GHz, -24.82 sim+3.88ppm/°C, respectively, depending on the value of x. Simulated dielectric resonator (DR) with Mg_4Ta_2O_9-15wt%TiO_2 ceramics had the operating frequency of 11.97GHz and S_{2,1} of -35.034dB. |