在本論文內將討論La(Mg1/2Ti1/2)O3介電陶瓷材料，藉由分別添加不同燒結促進劑B2O3、ZnO、CuO，探討產生的液相對其微波特性的影響，實驗結果顯示，添加1wt%的B2O3可有效降低燒結溫度到1425℃，此時可得介電特性εr~27.9，Q×f~63000(9GHz)，τf~-40(ppm/oC)。由於τf為負值，我們選擇添加CaTiO3(+712(ppm/oC))以調整其τf。在1400℃燒結時，0.5La(Mg1/2Ti1/2)O3-0.5 CaTiO3＋1wt% B2O3具有最佳的介電特性﹔εr~44，Q×f~29000(7GHz)，τf~-8(ppm/oC)。因此改善了La(Mg1/2Ti1/2)O3介電陶瓷的微波特性。
　　另外，本論文以FR4、氧化鋁、La(Mg1/2Ti1/2)O3為基板，製作設計一個緊密的微帶步階阻抗髮夾式elliptic函數低通濾波器，3dB截止頻率定為2GHz，階數為三階。

　　The microwave properties of La(Mg1/2Ti1/2)O3 dielectric ceramic materials are discussed in this paper. By adding different sintering aids B2O3、ZnO and CuO
respectively, we study the existence effects of liquid phase for the microwave properties of La(Mg1/2Ti1/2)O3. The experiment results show that La(Mg1/2Ti1/2)O3 with 1wt% B2O3 addition can efficiently reduce sintering temperature from 1650 oC to 1425 oC, and we obtain that the dielectric properties are εr~27.9，Q×f~63000(9GHz) and τf~-40(ppm/oC). Concerning about the negative value of τf , we choose adding the CaTiO3(+712(ppm/oC)) to adjust the value approaching to zero. At 1400 oC, 0.5La(Mg1/2Ti1/2)O3-0.5 CaTiO3＋1wt% B2O3 appears the best property: εr~44, Q×f~29000(7GHz) andτf~-8(ppm/oC) . Hence, the microwave properties of La(Mg1/2Ti1/2)O3 dielectric ceramic materials is improved.
　　In addition, we design and fabricate a third order compact elliptic function low-pass filters using microstrip stepped-impedance hairpin resonators with 2GHz 3dB cutoff frequency on FR4、Al2O3、La(Mg1/2Ti1/2)O3 substrate.

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