臺灣博碩士論文加值系統

本篇論文的研究以槽孔天線為軸心，並提出一系列不同結構的共平面槽孔天線，運用各種設計方法藉以達到不同的應用頻段。本論文首先提出一個具有雙頻帶的共平面三角環形槽孔天線。低頻(2.34-2.8 GHz)是藉由三角環形槽孔以及電容性負載所激發。高頻是利用在三角形金屬片上埋入兩個T型槽縫所激發，且其寬頻帶(5.15-6.9 GHz)的阻抗匹配也是由電容性負載所致。此新型天線可應用在2.4/5.2/5.8 GHz 的WLAN系統。接著提出一個共平面圓環形槽孔天線之設計，和前面所提出的三角環形槽孔天線一樣，利用電容性負載調整阻抗匹配，使低頻模態的中心頻率能設計在2.5 GHz。並藉由弧形殘枝激發5.8 GHz的諧振模態，且與原來4.5 GHz的諧振模態結合，形成一個可操作在5.2、5.5及5.8 GHz的寬頻帶。此天線除了具有雙向輻射的特性外，在WLAN 2.4/5.2/5.8 GHz也呈現了穩定的增益。
最後提出一個共平面矩形槽孔天線之設計，可應用在WLAN 2.4/5.2/5.8 GHz及WiMAX 2.6/3.5/5.5 GHz。低頻(2.05-3.86 GHz)與高頻(4.38-5.88 GHz)的寬頻帶操作是藉由在矩形金屬片的左右兩側分別埋入兩個大小不一的倒L型槽縫所產生。此新型天線在WLAN和WiMAX的操作頻帶上皆具有穩定的增益。

The thesis focuses on the design of slot antennas and proposes a series of coplanar slot antennas with different structures by using a variety of design methods to meet different applicable frequencies. First, the thesis proposed a dualband coplanar triangle ring slot antenna. The lower band (2.34-2.8 GHz) is excited by the triangular ring slot and capacitive load, while the higher frequency band is excited by two T-slots embedded in the triangular radiation element, and its wide impedance bandwidth (5.15-6.9 GHz) is also due to the capacitive load. This novel antenna can be used in the WLAN 2.4/5.2/5.8 GHz. Then, a coplanar circular ring slot antenna design is proposed, and similar capacitive loading technique from the previous triangle ring slot antenna is used, so that the excited lower resonant mode can operate in the 2.4 GHz band. By inserting a pair of arc-shaped parasitic strip, a 5.8 GHz resonant mode is excited and by combining with the 4.5 GHz resonant mode, a broadband operation that covers the 5.2, 5.5 and 5.8 GHz bands is achieved. Besides demonstrating a bi-directional radiation characteristic, this antenna also shows steady gain variation in the WLAN 2.4/5.2/5.8 GHz operation.
Finally, a coplanar rectangular slot antenna design is proposed for WLAN 2.4/5.2/5.8 GHz and WiMAX 2.6/3.5/5.5 GHz operations. The two wideband operations are excited by embedding two inverted L-shaped slot with dissimilar sizes into the rectangular radiating element. This novel antenna also shows steady gain variation in the WLAN and WiMAX operations.

致 謝 i
摘 要 ii
Abstract iv
目 錄 vi
圖目錄 viii
縮寫及符號對照表 xi
第一章 序論 1
1.1 概述 1
1.2 文獻探討 3
1.3 內容提要 6
第二章 具有電容性負載的共平面三角環形槽孔天線設計 8
2.1 概述 8
2.2 天線結構 9
2.3 設計流程及重要參數分析 11
2.4 實測結果 20
第三章 具有弧形殘枝的多頻帶圓環形槽孔天線設計 25
3.1 概述 25
3.2 天線結構 26
3.3 設計流程及重要參數分析 28
3.4 實測結果 35
第四章 具有雙倒L型槽縫之共平面矩形槽孔天線設計 41
4.1 概述 41
4.2 天線結構 42
4.3 設計流程及重要參數分析 44
4.4 實測結果 52
第五章 結論 60
參考文獻 62
附 錄 68
作者簡介 69

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