本文首先探討(Mg0.95Ni0.05)4(Nb1-xTax)2O9(x=0.0~1.0)介電陶瓷材料之微波特性及其微結構。實驗結果顯示(Mg0.95Ni0.05)4Ta2O9在燒結溫度1375°C持溫4小時有較佳的微波特性：εr ~12.76、Q×f = 442,092GHz、τf ~-55.63ppm/°C。
為了改善材料對溫度的穩定性，我們在(Mg0.95Ni0.05)4Ta2O9中選擇添加τf具有正值的材料(Ca0.8Sr0.2)TiO3(εr ~181、Q×f=8,300GHz、τf ~+991 ppm/°C)，由實驗結果可知，0.3(Mg0.95Ni0.05)4Ta2O9-0.7(Ca0.8Sr0.2)TiO3在燒結溫度1350°C持溫4小時有較佳的微波特性：εr ~29.87、Q×f = 226,871GHz且τf ~-2.83ppm/°C。由於燒結溫度過高，我們嘗試著在Mg0.95Ni0.05)4Ta2O9中添加6~15 wt.%之燒結促進劑BaCu(B2O5)(BCB)( εr ~7.4、Q×f=50,000GHz、τf ~-32ppm/°C)，BCB是個好的低溫共燒陶瓷，故使用它來降低其燒結溫度期望達到降低製作成本，增加其應用性。
此外，本文藉由FR-4、Al2O3以及實驗研製之0.3(Mg0.95Ni0.05)4Ta2O9-0.7 (Ca0.8Sr0.2)TiO3為基板，製作一典型的交錯耦合式濾波器[1]，中心頻率2.4GHz，並利用電磁模擬軟體Zeland-IE3D模擬與實作測量做比較，也顯示利用自製基板的高介電係數及低損耗可縮小濾波器之尺寸與得到較好的頻率響應結果。

The microwave properties of (Mg0.95Ni0.05)4(Nb1-xTax)2O9(x=0.0~1.0) dielectric ceramic materials are discussed in this paper. The experimental results show that (Mg0.95Ni0.05)4Ta2O9sintered at 1375°C for 4 hours has the best microwave dielectric properties εr ~12.76, Q×f = 442,092GHz and τf ~-55.63ppm/°C. improve the temperature stability of the material, (Ca0.8Sr0.2)TiO3(τf ~ +991 ppm/°C) which has positive τf had been add. The experiment result showed that 0.3(Mg0.95Ni0.05)4Ta2O9-0.7(Ca0.8Sr0.2)TiO3 sintered at 1350°C for 4 hours has the best microwave dielectric properties εr ~29.87, Q×f = 226,871GHz and τf ~-2.83ppm/°C。
In addition, a typical cross-coupled planar microwave filter on FR-4, Al2¬O3 and 0.3(Mg0.95Ni0.05)4Ta2O9-0.7(Ca0.8Sr0.2)TiO3 are fabricated. And use the electromagnetic simulation software Zeland-IE3D compare simulation with experimental measurements, the experimental measurements demonstrate the ceramic 0.3(Mg0.95Ni0.05)4Ta2O9-0.7(Ca0.8Sr0.2)TiO3 can be used for microwave applications because of their superior micro properties of low loss, small device area, high Q×f value and high relative dielectric constant substrate. As the sintering temperature is too high, BaCu(B2O5)(BCB) was used to decrease the sintering temperature of (Mg0.95Ni0.05)4Ta2O9 ceramics with 6~15 wt.% , BCB is a good low-temperature co-fired ceramics (εr ~7.4、Q×f=50,000GHz、τf ~-32ppm/°C) , expected to reduce production costs and increase its applicability.

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