隨著快速發展的微波無線通信系統（例如：行動電話系統，全球定位系統和無線區域網路），對高性能介電陶瓷的需求一直不斷增加。但由於通信系統中的工作頻率逐漸被擴展到較高的頻率範圍，所以近年來微波介質陶瓷的研究焦點都集中在低損耗（高品質因素）的電介質上。此外，降低燒結溫度也成為製造小型化多層元件的一個重要課題。如以上所述，本論文將分為三個部分加以探討及研究：

一、Mg4Nb2O9陶瓷之研究
[a]剛玉結構的Mg4Nb2O9具有優異的微波介電特性，但它同時也需要在高達1350至1400°C的燒結溫度下燒結10小時。在本論文中，選擇Fe2O3作為燒結促進劑加入Mg4Nb2O9陶瓷中來降低其燒結溫度。結果發現，在Mg4Nb2O9陶瓷中添加Fe2O3可以達到降低燒結溫度（〜130°C）和改善Q×f值的效果。
[b](Mg1−xZnx)4Nb2O9 (x = 0.02–0.08)陶瓷系統是利用傳統的氧化物混合法來合成，在這裡將對其微波介電特性和表面微結構進行研究，並由晶格常數和元素分析來確認本系統的固溶性。 (Mg0.95Zn0.05)4Nb2O9陶瓷材料能夠得到一個良好的微波介電特性 (εr ~ 13, Q×f ~ 247,000 GHz, τf ~ –67 ppm/°C)。
[c]為了產生對溫度穩定的材料，於是將鈦酸鍶（SrTiO3）加入到(Mg0.95Zn0.05)4Nb2O9陶瓷中。摻雜1 wt%的Fe2O3來使其在較低溫的燒結溫度下還能夠達到緻密燒結的效果。並由XRD、BEI和EDS分析證實其為兩相共存的系統。適當地調整摻雜1wt% Fe2O3的(1–x)(Mg0.95Zn0.05)4Nb2O9–xSrTiO3陶瓷中x的比例就可以實現趨近零的τf值。在1150°C燒結4小時的條件下摻雜1wt% Fe2O3的0.6(Mg0.95Zn0.05)4Nb2O9–0.4SrTiO3陶瓷擁有εr ~ 20.81，Q×f ~ 108,000 GHz，τf ~ –4.3 ppm/°C的微波介電特性，這使得它可以應用在微帶線濾波器的基板上。

二、Zn3Nb2O8陶瓷之調查
最近由於其相對低的燒結溫度（1150°C）和低的介質損耗，Zn3Nb2O8陶瓷已經引起相當多的關注。在Zn3Nb2O8陶瓷中利用M (M = Mg，Co，Ni)取代Zn，並於本論文中討論其相變化，晶體結構和微波介電特性。為了降低燒結溫度使其能應用在低溫共燒陶瓷，將摻雜少量的B2O3和CuO到陶瓷材料中。並進一步的研究其微波介電特性、二次相以及與銀電極共燒的化學穩定性。

三、微帶濾波器之設計與製作
在本章節，採用了步階阻抗環形諧振器與零度饋入結構來設計一個小型化的帶通濾波器。並透過使用高介電常數的陶瓷基板來降低濾波器的尺寸。而通帶的選擇性則可以利用零度饋電結構獲得改善。帶通濾波器中心頻率設計在2.4 GHz、約9％的頻寬，並討論其頻率響應在分別使用FR4、Al2O3和摻雜1wt% Fe2O3的0.6(Mg0.95Zn0.05)4Nb2O9–0.4SrTiO3陶瓷基板的影響。

With the rapid progress of microwave wireless communication such as mobile telephone systems, global positioning systems (GPS) and wireless local area networks (WLAN), the demand for high-performance dielectric ceramics has been ever-increasing. Because the working frequency of communication systems will be extended to a higher frequency regime in the future, the research of microwave dielectric ceramics has focused on the development of extremely low-loss (high quality factor, Q) dielectrics. Moreover, the reduction of sintering temperatures has also become an important issue in the fabrication of miniaturized multi-layer devices. As mentioned above, this dissertation is divided three parts which includes the study of high quality factor and low sintering temperature microwave dielectrics, and their applications on microstrip bandpass filters at the microwave frequency.

1. Investigation of High-Q Mg4Nb2O9 Ceramics
[a] The corundum-structured Mg4Nb2O9 has an excellent microwave dielectric properties, but it also required a sintering temperature of as high as 1350–1400°C /10 h. In this dissertation, Fe2O3 was chosen as a sintering aid and was added to Mg4Nb2O9 ceramics to lower its sintering temperature. A sintering temperature reduction (~130°C) and an improvement of Q×f value could be achieved by adding Fe2O3 to the Mg4Nb2O9 ceramics.
[b] The (Mg1–xZnx)4Nb2O9 ceramic with a smaller increment in x were prepared by solid-state method and its microwave dielectric properties and microstructures were also investigated in this topic. The forming of (Mg1–xZnx)4Nb2O9 (x = 0.02–0.08) solid solution was confirmed by the measured lattice parameters and the EDS analysis. The (Mg0.95Zn0.05)4Nb2O9 ceramics possesses a good combination of dielectric properties with εr ~ 13, Q×f ~ 247,000 GHz at 11.9 GHz, and τf ~ –67 ppm/°C.
[c] In order to produce a temperature-stable material, SrTiO3 was added to (Mg0.95Zn0.05)4Nb2O9 ceramic. Doping with 1 wt% Fe2O3 effectively achieve dense sintered ceramics at low sintering temperatures. A two-phase system was confirmed by the XRD patterns, BEI and EDS analysis. By appropriately adjusting the x value in the (1–x)(Mg0.95Zn0.05)4Nb2O9–xSrTiO3 ceramic with 1w% Fe2O3 additive, a near zero f value can be achieved. A dielectric constant εr of 20.81, a Q×f value of 108,000 GHz at 9.63 GHz and a τf value of –4.3 ppm/°C were obtained for 0.6(Mg0.95Zn0.05)4Nb2O9–0.4SrTiO3 ceramics with 1w% Fe2O3 additive sintered at 1150°C for 4 h, which makes it a very promising candidate material for applications in microwave planar filters.

2. Study of Low-temperature Sintered Zn3Nb2O8 Ceramics
Recently, monoclinic-structured Zn3Nb2O8 ceramics have attracted more attention because of its relatively low dielectric loss and low sintering temperature (1150°C). The effects of M (M = Mg, Co and Ni) substitution for Zn on the phase relation, crystal structure and microwave dielectric properties of Zn3Nb2O8 ceramics were investigated in this dissertation. Results indicate that the partial substitution boosted the Q×f to an even higher value. In order to reduce the sintering temperature for application in LTCC devices, small amounts of B2O3 and CuO were added to the ceramics. Furthermore, the microwave dielectric properties, the presence of the second phase, and the chemical compatibility with the silver electrodes were also investigated.

3. Design and Fabrication of Planar Filters
A miniaturized bandpass filters using stepped impedance ring resonators with zero-degree feed structure are presented in this section. In addition, the bandpass filter using high-permittivity ceramic substrate provide good miniaturization ability. The selectivity of passband can be improved by utilizing the zero-degree feed structure. The miniaturized bandpass filters are designed at a center frequency of 2.4 GHz with bandwidth of about 9%. The frequency responses of the filters using FR4, Al2O3 and 1wt% Fe2O3 doped 0.6(Mg0.95Zn0.05)4Nb2O9–0.4SrTiO3 ceramic substrates are investigated.

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