本文將探討添加燒結促進劑對於陶瓷微波介電材料Mg4Nb2O9之介電特性與材料之微結構的影響。Mg4Nb2O9 其介電常數為12.9，Q×f 為210000GHz，且共振頻率之溫度飄移係數為-70.4 ppm/℃，但其燒結溫度必須達到近1400℃，且燒結時間必須長達10 小時，故分別添加不同燒結促進劑Fe2O3、ZnO 和WO3 以降低其燒結溫度，並探討添加後對其介電特性與材料之微結構是否產生影響。根據實驗結果顯示，添加不同燒結促進劑均可使燒結溫度降低至1270℃~1330℃，且燒結時間均減少至4 小時。而添加後擁有最佳介電特性之燒結促進劑為Fe2O3，當添加量為0.75wt%時，介電常數為13.46，且Q×f可達到280000GHz(11GHz)，溫度飄移係數為-62 ppm/℃。
此外，本論文還分別以FR4、Al2O3 及添加0.75wt%Fe2O3 的Mg4Nb2O9 作為基板來設計一方型片狀共振器之帶通濾波器，濾波器的規格為：中心頻率2.45GHz、頻寬約25%，並使用電磁模擬軟體HFSS 來進行電腦模擬，最後探討模擬與實際量測之差異。

The influence of adding sintering aids on dielectric properties and microstructure of the ceramic microwave dielectric materials Mg4Nb2O9 was investigated. The dielectric constant of Mg4Nb2O9 is 12.9, Q×f is 210000GHz, and τ is -70.4 ppm/°C. Nevertheless,the sintering temperature is around 1400℃, and sintering time must approach to 10 hours.Trying to add different sintering aids Fe2O3、ZnO and WO3 respectively in order to decrease the sintering temperature and time. And concern about whether the dielectric properties and microstructure would be affected by adding the sintering aids.According to the experiment results, the sintering temperature would be decreased to about 1270°C ~1330°C by adding different sintering aids, and the sintering time also be reduced to 4 hours. The sintering aids which has the best dielectric properties is Fe2O3.With 0.75wt% Fe2O3 addition, the dielectric constant is 13.46, Q×f is 280000GHz (at
11GHz) and τ is -62 ppm /°C.Furthermore, a square patch resonator of bandpass filter was designed and fabricated.
The filter which center frequency is 2.45GHz and bandwidth is about 25% was realized on FR4, Al2O3 and Mg4Nb2O9 with 0.75wt% Fe2O3 doped substrates. And discuss the
difference between the results of simulation by the software HFSS and measurement.

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