在本論文首先探討(Mg1-xCox)2(Ti0.95Sn0.05)O4(x = 0.01~0.09)之微波介電特性，由實驗得知(Mg0.95Co0.05)2(Ti0.95Sn0.05)O4在燒結溫度1350℃持溫4小時擁有最佳微波介電特性：ε_r~14.70、Q×f~330,134 GHz(at 12.08 GHz)、τ_f~-48.18 ppm/℃。為求τ_f~0的要求，添加具有正值共振頻率溫度飄移係數的材料Ca0.8Sr0.2TiO3(τ_f~+991 ppm/℃)、Ca0.8Sm0.4/3TiO3(τ_f~+400 ppm/℃)、Ca0.61Nd0.8/3TiO3(τ_f~+270 ppm/℃)。由實驗得知0.48(Mg0.95Co0.05)2(Ti0.95Sn0.05)O4-0.52 Ca0.61Nd0.8/3TiO3在燒結溫度1325℃時持溫4小時擁有最佳微波特性：ε_r~28.58、Q×f~208027 GHz(at 8.52 GHz)、τ_f~-4.38ppm/℃。
此外，本論文以FR-4、Al2O3及自製基板0.48(Mg0.95Co0.05)2(Ti0.95Sn0.05)O4-0.52 Ca0.61Nd0.8/3TiO3設計及製作一操作在2.4 GHz的微帶線帶通濾波器。最後量測其頻率響應，由量測結果得到，利用高介電系數及低損耗的材料做為電路基板時，能達到縮小面積以及具有更好的濾波特性。

The microwave dielectric properties and the microstructures of (Mg1-xCox)2(Ti0.95Sn0.05)O4 (x = 0.01~0.09) by the conventional solid-state route were prepared.A fine combination of microwave dielectric properties (ε_r ~ 14.7, Q × f ~ 330,000 at 12.08 GHz, τ_f ~ -48.18 ppm/℃) was achieved for (Mg0.95Co0.05)2(Ti0.95Sn0.05)O4 ceramics sintered at 1350℃ for 4 h. In order to adjust their negative τ_f, Ca0.8Sr0.2TiO3, Ca0.8Sm0.4/3TiO3, Ca0.61Nd0.8/3TiO3 which have positive τ_f had been add. Then, we designed and fabricated a bandpass filter on FR4、Al2O3、0.48(Mg0.95Co0.05)2(Ti0.95Sn0.05)O4 -0.52(Ca0.61Nd0.8/3)TiO3 substrates. According to the results of measurements, the frequency response of the filter was improved by using low-loss dielectric ceramics as the substrate.

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