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標題: | 多頻帶阻絕天線之設計與電路模型分析 Design and Modeling of Multi-band Notched Antennas |
作者: | Yu-Hsiang Chang 張宇翔 |
指導教授: | 林怡成 |
關鍵字: | 頻帶阻絕,多頻天線,單極天線,多輸入多輸出,超寬頻, band-notch,defected ground structure (DGS),MIMO,monopole,multi-band antennas,UWB, |
出版年 : | 2013 |
學位: | 碩士 |
摘要: | 本論文提出了多頻帶的多輸入多輸出天線系統,相較於大部分的多頻天線用結構上的延伸來增加額外的頻帶,本論文以頻帶阻絕的方式來達到多頻的效果。本論文中先分析V形槽孔濾波器在傳輸線時的特性,再與超寬頻天線整合,將過V形槽孔做適當的調整後,過濾掉不需要的頻帶,即可設計出一個多頻帶的天線。此流程的優點在於天線本身不需要重新設計,只要將V形槽孔的參數重新調整後,就可以將天線做不同的應用。
除了與天線整合,我們也將同樣的概念用於提高天線之間的隔離度。兩支天線在近距離擺放時,由於共用接地面,容易產生電磁耦合的效應,造成天線匹配與效率變差,在天線共用的接地面加上槽孔,可以利用其頻帶阻絕的特性抑制電流,提升兩支天線間的隔離度。 本論文中提出了槽孔型濾波器、單極超寬頻天線以及帶阻天線之等效電路模型,由電路模型可以更加理解其工作原理,天線的部分也透過實作與模擬結果互相驗證,量測與模擬結果相當吻合。 In this thesis, a multi-band MIMO antenna system is proposed. Compared to the traditional multi-band antennas using extended geometry to obtain additional operation bands, we employed the band-notching concept to achieve multi-band operation. We started with the analysis of the microstrip line over a V-shaped defected ground structure. Then, we applied V-slots on the UWB monopole antenna. By properly designing the slot dimension, we can notch out unwanted bands to complete a multi-band antenna. Using the proposed design method, the antenna can be easily modified for various applications simply by re-designing the V-slots without changing the antenna dimension. The mutual coupling is a critical issue when two antennas are closely spaced. We also applied the band-notched slots on the common ground. The isolation of two antennas was successfully enhanced. The equivalent circuit models of V-shaped DGS, UWB monopole and tri-band notched antenna are proposed. Through the circuit model, we have a deeper insight of the working principle of our designs. The prototype of UWB monopole antenna, tri-band notched antenna and multi-band MIMO antenna system were designed, built, and tested with a very good agreement between the simulated and measured results. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/62421 |
全文授權: | 有償授權 |
顯示於系所單位: | 電信工程學研究所 |
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檔案 | 大小 | 格式 | |
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ntu-102-1.pdf 目前未授權公開取用 | 7.88 MB | Adobe PDF |
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