摘 要

　　縮小化及雙頻段的晶片型天線設計，已廣泛出現在國內外的論文[1][2]顯示此兩種設計已經成為天線設計的重要趨勢。但是在實現縮小化的同時，使得頻寬相對縮小。在本文中嘗試以低溫共燒陶瓷(Low Temperature Co-fired Ceramic)技術[3][4]，實現一個λ/4的螺旋天線取代λ/4的單極天線，其大小為13mm*5.25mm*1.2mm，為了達成縮小化的訴求。並在螺旋天線中加入單極天線，產生雙頻操作，使得兩路徑彼此獨立。之後在單極天線的兩側在加入兩支單極寄生天線，其目的在產生高頻的寄生模態，以達到增加頻寬的效果。之後調整三支單極天線的長度，及之間的相對距離使得兩個模態互相靠近，增加頻寬。使得本論文的晶片型天線的第二模態頻寬擴增到由360MHz足以涵蓋DCS頻段[5]。且再第一模態及第二模態匹配最好的頻率點的平均增益[6]分別為-6.23dBi及－6.56dBi。使得本論文設計的晶片型天線符合此兩種趨勢。
　　另外，設計900/1800MHz雙頻螺旋單極天線同時，本論文中也依據傳輸線理論建立其等校電路，希望與原先的立體結構晶片型天線可以有良好的對照。除了藉由等效電路的探討已獲得更多天線工作原理資訊外，利用晶片型天線等效電路模型的建立以達到精確預測晶片型天線的實作量測結果，強化電路模擬在晶片型天線設計的功能，減少實作次數及電磁模擬的誤差。
* 作者:陳逸仙 ** 指導教授：李文熙

Abstract

　　The designs of dual-band and small antennas are widely proposed in national/international microwave conferences and academic journals.[1][2] It reveals that these two kinds of design already become important trend. Because of reducing antenna size, the antenna bandwidth would decrease. In this thesis, we take advantage of Low Temperature Co-fired Ceramic[3][4]to realizeλ/4 helical antenna instead of λ/4 monopole and hope to minimize antenna size.(antenna size= 13mm*5.25mm*1.2mm) Then we add monopole in theλ/4 helical antenna. In this way，this kind of antenna would have two independent resonance paths to produce dual-band operation .Then we add another two parasitic antenna to enhance the second mode bandwidth and adjust these three monopole antenna length and the distance of each other .Trying to make these two mode closer in high band for wider bandwidth effect. This skill could make the second mode bandwidth of our chip antenna to achieve 360MHz(could cover DCS band)[5].The average gain in low band is-6.23dBi and the average gain[6] in high band is -6.56dBi.In this way, the chip antenna could fit to these two kinds of trend.
　　At the same time, we set up equivalent circuit modal according to transmission line theory. We hope the circuit modal could analyze the chip antenna correctly and expect to acquire more information of the antennas operation principles through the discussions of circuit models. We could take advantage of circuit modal to predict chip antenna practical measurement and strengthen circuit modal function in antenna design to reduce fabrication times and E-M simulation mistake and error.
* Student: Yi-shien Chen ** Advisor: Wen-Shi Lee

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