本實驗首先探討(Mg1-xZnx)2(Ti0.95Sn0.05)O4，x為大範圍取代(x=0.05~1)之微波介電特性，由實驗得知當Zn2+取代比例上升時，可以使燒結溫度下降，並可觀察到在Zn2+少量取代的範圍內有較佳的相對密度與Q×f。接著藉由Zn2+微量取代Mg2+，Sn4+微量取代Ti4+，得知(Mg0.95Zn0.05)2(Ti0.95Sn0.05)O4在燒結溫度1300℃持溫4小時擁有最佳微波介電特性：εr=15.55、Q×f=319,691GHz(at 11.36GHz)、τf=-52.07ppm/℃。為期望τf≅0添加具有正值共振頻率溫度飄移係數的材料(Ca0.8Sr0.2)TiO3(τf≅+991ppm/℃)，由實驗得知0.91(Mg0.95Zn0.05)2(Ti0.95Sn0.05)O4-0.09(Ca0.8Sr0.2)TiO3在燒結溫度1325℃時持溫4小時，擁有最佳微波特性：εr=18.67、Q×f=147,889(at 10.1952GHz)，τf=-1.82。最後以FR-4、Al2O3及0.91(Mg0.95Zn0.05)2(Ti0.95Sn0.05)O4-0.09(Ca0.8Sr0.2)TiO3設計及製作一操作在2.4GHz的微帶線帶通濾波器。由量測結果可知，利用高介電常數及低損耗的介電陶瓷材料做為電路基板時，確實能達到提升效能和縮小尺寸之需求。

The microwave dielectric properties and the microstructures of (Mg1-xZnx)2(Ti1-ySny)O4 by the conventional solid-state route were prepared. As x increased from 0.05 to 1, it showed a remarkable lowering in the sintering temperature. A fine combination of microwave dielectric properties (εr~15.55, Q×f~319,691GHz at 11.36GHz, τf~-52.07ppm/℃) was achieved for (Mg0.95Zn0.05)2(Ti0.95Sn0.05)O4 ceramics sintered at 1300℃ for 4 hr. In order to adjust their negative τf, Ca0.8Sr0.2TiO3 which have positive τf had been add. Then, we designed and fabricated a bandpass filter on FR4、Al2O3、0.91(Mg0.95Zn0.05)2(Ti0.95Sn0.05)O4-0.09Ca0.8Sr0.2TiO3 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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