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，且試圖調整溫度飄移係數使其為零；第二部份將介紹其在被動電路之應用,且實做於不同基板上探討元件尺寸的改善。
第一部份首先要介紹(Mg0.95Ni0.05)2TiO4陶瓷系統之微波介電特性。由實驗中可得知(Mg0.95Ni0.05)2TiO4在1400℃燒結4小時可得到最佳之介電特性 ~16.4，Q׃~238000(at 9.8GHz)， ~ -55 ppm/oC。由於此系統之 為負值，故選擇以 為正值且高介電係數及高品質因素的材料CaTiO3、SrTiO3添加，探討溫度飄移係數趨近零之最佳比例。
第二部份首先介紹改良式雙極點帶通滤波器,我們利用電磁模擬軟體，來模擬設計在滤波器，其中心頻率 =2.4GHz、頻寬~10%。 此外, 我們將濾波器實做於FR4、Al2O3及0.92MNT-0.08CT(自製)三種基板上。以比較不同介電常數及品質因素使濾波器的電路尺寸及頻率響應上的差異性。

There are two main subjects in this paper. First, we will discuss the low loss dielectric material, and try to make temperature coefficient of resonant frequency near zero. Second, there will be a discussion of microstrip filter and improvement of circuit size in different substrates.

First, the microwave dielectric properties of (Mg0.95Ni0.05)2TiO4 have been investigated. The experiment results show that (Mg0.95Ni0.05)2TiO4 has the best properties at sintering temperature 1400℃ for four hours, which could reach the best dielectric properties ~ 16.4, Q×f ~ 238000(at 9.8GHz) and ~ -55 ppm/oC. Concerning about the negative value of , we choose adding the CaTiO3 ( ~ 800 ppm/oC) and SrTiO3 ( ~ 1300 ppm/oC) to adjust the value, then we could make temperature coefficient of resonant frequency near zero.

Besides, hairpin planar filter were studied in second section which achieved spurious responses supression by properly choosing the different stepped- impedance ratio. We simulated it by electromagnetic simulation software at the setting of center frequency 2.4GHz and bandwidth 10%. Also, we try to realize that the improvement of frequency response and circuit size at the substitution of FR4, Al2O3 and 0.92MNT-0.08CT for the microstrip bandpass filter.

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