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，且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(Co1－xZnx)Nb2O6 (x = 0.02－0.10)陶瓷系統之微波介電特性。由實驗中可得知(Co0.95Zn0.05)Nb2O6 在1210°C燒結4小時可得到最佳之介電特性 εr~ 23.6，Q׃~ 110,000 (at 9 GHz)，τf ~ –70 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 (+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2.45 GHz的微帶線帶通濾波器，濾波器主要採用混和耦合的Hairpin結構做為主體，並使用凹槽來抑制二倍頻響應。最後，我們將此電路實作在FR4、氧化鋁和自製基板上，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. First, we will discuss the low loss dielectric material, and try to adjust temperature coefficient of resonant frequency near zero. Second, there will be a discussion of passive components and improvement of circuit size in different substrates.
First, the microwave dielectric properties of (Co1－xZnx)Nb2O6(x = 0.02－0.10) ceramic system have been investigated. The experiment results show that (Co0.95Zn0.05)Nb2O6 ceramics has the best properties at sintering temperature 1210°C for 4 hours, which could reach the best dielectric properties εr~ 23.6 Q×f ~ 110,000 (at 9 GHz) and τf ~ –70 ppm/°C. Concerning about the negative value of τf, we choose adding the TiO2 (+420 ppm/°C) to adjust the value, then we could make temperature coefficient of resonant frequency near zero.
Second, we design and fabricate a microstrip band-pass filter which resonator at 2.45 GHz. The filter was constructed by hairpin structure by using mix coupling. Finally, a square groove was added to suppress the spurious response. The pattern was printed on FR4, Al2O3 and 0.81(Co0.95Zn0.05)Nb2O6–0.19TiO2 substrates. By measured their frequency responses, using the substrates of high dielectric constant and low loss, which can improve the performance and reduce filter’s size.

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