臺灣博碩士論文加值系統

在本論文中提出了一種以模擬傳輸線而使天線縮小化的方法。這個方法是利用較小但有相同散射矩陣的電路元件來取代天線中共振的區段，從而減少天線的面積。
　　使用上述方法，本論文提出數種共面波導饋入的槽孔型天線，相較於傳統的槽孔型天線，它在保持輻射場型下，有更小的尺寸，同時也因為天線面積變小，增益有所降低，但仍在可接受的範圍內，此外因為縮小化而降低的頻寬，可以透過適當地修改天線結構和稍微降低縮小化，回到原有的程度。
以上所有提出的理論、天線的模擬與實驗驗證，在本論文中都會加以詳細地探討。

In this thesis, a method for size reduction of the slot antenna is presented. The method first treats the resonant part of the antenna as a transmission line section. Then, the transmission line section is set equivalent to the circuit model with components that have small dimensions. Finally, resonant part of the antenna is replaced by the equivalent components and the size reduction is achieved.
Base on the above method, several miniaturized CPW-fed slot antennas are pro-posed. Compared with the traditional CPW-fed slot antennas, the proposed designs not only have much smaller areas, but still retain the radiation patterns. As expected, nar-rower bandwidth and lower antenna gain level are the cost of miniaturization. However, with some modifications on the antenna structure, bandwidth can be enlarged back to the original level. Of course, degradation on miniaturization level is the cost of this bandwidth enhancement.
All the methods and designs mentioned above are discussed and verified experi-mentally.

口試委員會審定書 ii
誌謝 iii
Abstract iv
中文摘要 v
Contents vi
List of Figures viii
List of Tables xii
Chapter 1 Introduction 1
1.1 Motivation and literature survey 1
1.2 Chapter outlines 2
Chapter 2 Equivalent Model for Transmission Line 4
2.1 Transmission (ABCD) matrix of transmission line section 4
2.2 Lump circuit equivalence 5
Chapter 3 Miniaturized Slot Antenna Fed by Coplanar Waveguide 11
3.1 Antenna design 11
3.2 Antenna geometry 20
3.3 Experimental and simulation results 21
3.4 Conclusion 32
Chapter 4 Bandwidth Enhancement of the Miniaturized CPW-Fed Slot Antenna 33
4.1 Antenna geometry and design 33
4.2 Experimental and simulation results 44
4.3 Conclusion 50
Chapter 5 Miniaturized CPW-Fed Slot Antenna Designed on Infinite Ground Plane 51
5.1 Antenna geometry and design 51
5.2 Experimental and simulation results 55
5.3 Conclusion 63
Chapter 6 Conclusion 64
Reference 65

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