本篇論文主要分別介紹兩大部分，第一部分將介紹新開發的低損耗微波介電材料；第二部分將設計一濾波器，實作於不同基板上後探討其微波特性。
第一部分首先介紹BaCo2(VO4)2陶瓷之微波介電特性，接著使用與Co2+ (0.745Å)離子半徑相近的Mg2+(0.72Å)對BaCo2(VO4)2中的Co2+做取代，並探討Ba(Co1-xMgx) 2(VO4)2 (x = 0–0.8)的微波介電特性與材料微結構。由實驗得知，當取代比例為x = 0.6，且燒結溫度在840oC時有良好的微波介電特性，εr ~12.3, Q×f~71,000 GHz, τf ~ –40.6 ppm/°C，是符合LTCC共燒溫度的材料。
第二部分將設計一操作在2.4/5.2GHz的雙頻帶通濾波器。濾波器採用方形環狀諧振器為主體，為縮小面積，將其改成增強型彎曲環狀諧振器，並在其對稱面上加入一正方形電容性微擾物，以激發奇偶模態的耦合，接著使用line-to-ring coupling的方式饋入以改善插入損耗。最後，我們將電路實作在FR4、Al2O3、Ba(Co0.6 Mg 0.4)2(VO4)2基板上，並量測其頻率響應。由量測的結果可得知，利用高介電係數及低損耗的材料做為電路基板時，確實能達到提升效能和縮小面積的需求。

In order to obtain a novel low-temperature co-fired ceramics (LTCC), the microwave dielectric properties of Ba(Co1-x Mg x)2(VO4)2 (x = 0–0.8) ceramics had been investigated. The experimental results show that BaCo2(VO4)2 has the best properties at sintering temperature 690℃ for 4 hours, with ε_r~14.1, Q×f~ 43,600 GHz, and τf ~－43 ppm/℃. Then the Co2+ from the BaCo2(VO4)2 had been substituted by Mg2+, at x = 0.6, where the ε_r~12.3, Q×f~71,000, τf ~－40.6 ppm/℃at the sintering temperature of 840℃ for 4 hours. Then, we designed and fabricated a bandpass filter on FR4、Al2O3、Ba(Co0.6 Mg 0.4) 2(VO4)2 substrates. According to the results of measurements, the performance of the filter was improved by using low-loss dielectric ceramics as the substrate.

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