本論文開發0.82(Mg0.95Zn0.05)TiO3-0.18(Na1/2Nd1/2)TiO3陶瓷材料之製作，探討該材料的微結構及應用於通訊元件時的微波介電特性，然後再探討該材料應用於微波元件之製作及結果。在0.82(Mg0.95Zn0.05)TiO3-0.18(Na1/2Nd1/2)TiO3陶瓷材料系統的研究上，發現其在1300°C燒結時，頻率溫度飄移係數可趨近於零，而介電常數約為25，Qxf最高可達8萬多，比MgTiO3-(Na1/2Nd1/2)TiO3系統的Qxf高出約一點五倍。在微波元件之製作上，本論文提出一種新型的帶通濾波器，主要是利用Butterworth一階低通濾波器及一個開路殘段，經轉換，可獲致二階帶通濾波器之效果，其中心頻率頻段為2.4GHz，頻寬約為10%，此濾波分別製做在FR4、Al2O3及自製研發的0.82(Mg0.95Zn0.05)TiO3-0.18(Na1/2Nd1/2)TiO3基板上，最佳之S21可達0.7dB。

In order to develop new dielectric material for microwave devices, we studies the fabrication and properties of 0.82(Mg0.95Zn0.05)TiO3-0.18(Na1/2Nd1/2)TiO3. The experimental results show that at the sintering temperature of 1300oC, the frequency shift temperature of the ceramic material can be made almost zero with relative dielectric constant of 25 and Qxf value of more than 80,000, which is 1.5 times of that of the material MgTiO3-(Na1/2Nd1/2)TiO3. We also proposed a novel band-pass filter which is transformed from a Butterworth low pass filter of order one by inserting an open stub. The filters, fabricated on the substrates of FR4, Al2O3 and 0.82(Mg0.95Zn0.05)TiO3-0.18(Na1/2Nd1/2)TiO3, are equivalent to a band-pass filter of order two on the specifications of center frequency of 2.4GHz, bandwidth of 10% and best S21 value as high as 0.7dB.

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