臺灣大學: 電信工程學研究所陳怡然蔡凱宇Tsai, Kai-YuKai-YuTsai2013-03-272018-07-052013-03-272018-07-052011http://ntur.lib.ntu.edu.tw//handle/246246/252848本論文的主要重點為，在不嚴重影響分枝線耦合器的特性下，所達成的面積縮減。提出兩個應用來達成此目標: 第一部分，使用手指型和葉狀型的分佈式電容； 第二部分，在標準印刷電路板(Standard Printed Circuit Board)的背板使用缺陷地技術。 在論文的第一部分，手指型和葉狀型的分佈式電容被提出，來提高耦合器本身的電容性，進而造成耦合器的面積縮減。文章中，展示兩個應用手指型和葉狀型的微型化耦合器，其操作頻率為836.5MHz。量測的結果顯示，在沒有嚴重影響分枝線耦合器的特性下，耦合器的面積分別被縮減為70% 和 73%。 在論文的第二部分，缺陷地技術被運用，來近一步達成更好的面積縮減。缺陷地的基本理論為，擾動耦合器訊號線下所產生的渦電流(Eddy current)。藉由設計一個適當的蝕刻圖型，感應的電流可以被截斷，進而增強整體的電感性，達到更好的面積縮小。在文章中，一個運用葉狀型分佈式電容和缺陷地的耦合器被實作和量測，其操作頻率為836.5MHz。藉由量測實際的耦合器，發現其面積縮減可以達到86%。Reducing the size of a 3-dB branch-line hybrid coupler without significant performance degradation is the main purpose of this thesis. Two techniques are used in order to achieve this goal: first is the application of the finger-shaped or leaf-shaped distributed capacitors; and second is use of defected ground on the bottom metal of standard PCB. In the first part of this thesis, the finger-shaped or leaf-shaped distributed capacitors are proposed in the design of a 3-dB branch-line hybrid coupler in order to increase the capacitance between ports. As a result, the size of a 3-dB branch-line hybrid coupler could be substantially reduced. Two samples of miniaturized branch-line hybrids at 836.5MHz using the design of the finger-shape and leaf-shape structure have been fabricated and measured. Without significant performance degradation, the physical sizes of the fabricated branch line hybrid couplers are reduced by 70% and 73%, respectively. In the second part, the defected ground design is applied to the leaf-shaped hybrid to further minimize the size. Defected ground creates an eddy current disturbance underneath the coupler. By designing an appropriate etched pattern, the induced current is interrupted to enhance circuit inductance. The size of coupler can be reduced accordingly. A miniaturized branch-line hybrid with leaf-shaped capacitors and defected ground at 836.5MHz has been fabricated and measured. The physical size of the branch line hybrid coupler is reduced by 86%.2261319 bytesapplication/pdfen-US微型化耦合器分佈式電容缺陷地結構耦合電容開環諧振器miniaturized hybrid couplerdistributed capacitorsdefected ground structureshunt capacitorsplit-ring resonatorthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/252848/1/ntu-100-R98942002-1.pdf