在此篇論文中主要介紹兩大部分，第一部份將介紹低損耗的介電材料，並嘗試著調整共振頻率溫度飄移係數使其為零；第二部份將介紹其在被動元件之應用，並實作於不同基板上探討元件尺寸的改善。
第一部份首先要介紹CoNb2O6陶瓷系統之微波介電特性。並使用與Nb5+相同離子半徑的Ta5+來微量取代Nb5+位置，形成Co(Nb1-xTax)2O6（x＝0.02－0.1）固溶體，研究其材料特性及微波介電性質。由實驗中可得知Co(Nb0.95Ta0.05)2O6在1210°C燒結4小時可得到最佳之介電特性εr ~ 22.6，Q׃~ 132,100 GHz（at 9.245 GHz），τf ~ –62 ppm/°C。由於此系統之τf為負值，我們添加具正值共振頻率溫度飄移係數的TiO2（τf ~ +420 ppm/°C），探討共振頻率溫度飄移係數趨近零之最佳比例。
第二部份我們設計及實作一操作在2.4 GHz的微帶線帶通濾波器，濾波器主要採用一反對稱饋入磁場耦合濾波器為主體，並在共振器內加入一開路殘段（open-stub），藉此使得頻寬變窄。在饋入端上也加上一開路殘段來抑制倍頻寄生響應。最後，我們將此電路實作在FR4、氧化鋁和0.84Co(Nb0.95Ta0.05)2O6–0.16TiO2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。

There are two main subjects in this thesis. The first one discussed was the low loss dielectric material, and to adjusted temperature coefficient of resonant frequency to closed zero. Second, passive components and improvement of circuit size in different substrates will be discussed.
First, used Ta5+ ions to substituted Nb5+ ions for the the same ionic radius and form the Co(Nb1-xTax)2O6 （x＝0.02-0.1）solid solutions. According to the experiment results of microwave dielectric properties showed that Co(Nb0.95Ta0.05)2O6 ceramics has the superior properties at sintering temperature 1210°C for 4 hours, and the dielectric properties are εr~ 22.6, Q×f ~ 132,100（at 9.245 GHz）and τf ~ –62 ppm/°C. Concerning about the negative value of τf, choosed the TiO2（τf ~ +420 ppm/°C）to adjust the value, then made an the temperature coefficient of resonant frequency to closed zero.
Second, designed and fabricated a microstrip band-pass filter which resonator at 2.4 GHz. The filter was a magnetic coupling filter using skew-symmetric feed structure, and tapped open stub in this design to obtained a narrow bandwidth. Finally, an open-stub was added to suppress the spurious response. The pattern was printed on FR4, Al2O3 and 0.84Co(Nb0.95Ta0.05)2O6–0.16TiO2 substrates. By measured their frequency responses, the substrate with high dielectric constant and low loss, can improve the performance and reduce the size of filter.

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