臺灣博碩士論文加值系統

本論文以槽孔天線為研究方向，並提出利用兩種不同饋入方式來設計槽孔天線以達到各種應用頻段。首先，本論文提出一個應用於無線區域網路(2.4/5.2/5.8 GHz WLAN)之微帶線饋入槽孔天線設計。為了達到雙頻帶操作特性，本論文提出於微帶線饋入的正下方(接地面)埋入三個槽孔，其中兩個槽孔為步階式阻抗(SI, stepped-impedance)設計，而另一個為倒L型槽孔設計。提出天線低頻及高頻之10-dB頻寬分別為610 MHz (24.78 %)及1110 MHz (19.80 %)，且有雙向性輻射場型、穩定的增益及至少66 %的效率。
接者本論文提出一雙頻共平面饋入環形槽孔天線之設計，可應用在WLAN (Wireless Local Area Network) 2.4/5.2/5.5/5.8 GHz及WiMAX (Worldwide Interoperability for Microwave Access) 2.3/2.5/3.5/5.8 GHz系統。低頻操作頻帶是藉由外圍環型金屬結構所激發，而高頻操作頻帶是由埋入兩個不同的金屬殘枝所產生。提出天線之低頻及高頻操作頻寬分別為1910 MHz (59.22 %)及1900 MHz (32.53 %)。提出天線天線除了結構小且具有雙向性輻射特性外，也於WLAN和WiMAX的操作頻帶上呈現穩定的增益。

The thesis focuses on the design of slot antennas. Here, two slot antennas were proposed with different fed-techniques that allow the antennas to operate at different applications. A microstrip-fed slot antenna design for WLAN（2.4/5.2/5.8 GHz）application was initially proposed. In order to achieve dual-band operation, three slots were embedded into the ground plane that located beneath the microstrip feed-line. Two of the loaded slots were of step-impedance (SI) designs, and the third one was an inverted L-shaped slot. The proposed antenna exhibited 10-dB bandwidth of 607 MHz (24.78 %) and 1102 MHz (26.83 %) for the lower and upper operating bands, respectively. Besides demonstrating bi-directional radiation characteristic, steady gain variation and at least 66 % of efficiency were also measured.
The second proposed antenna was a coplanar waveguide (CPW)-fed square-ring slot antenna with dual-band operation for WLAN (2.4/5.2/5.8 GHz) and WiMAX (2.3/2.5/3.5/5.7 GHz) applications. The lower operating band was excited by the square-ring with asymmetric ground plane, and the upper operating band was induced by a stub-protruded monopole and a double-bent stub loaded into the ground plane. The antenna has small structure and exhibited bi-directional radiation characteristics. In addition, it also demonstrated steady gain variation within the WLAN and WiMAX operating bands.

摘 要 i
目 錄 iv
圖目錄 vi
縮寫及符號對照表 viii
第一章 序論 1
1.1 概述 1
1.2 文獻探討 3
1.3 內容提要 5
第二章 應用在WLAN系統之微帶線饋入雙頻槽孔天線 7
2.1 概述 7
2.2 天線結構 8
2.3設計流程及重要參數分析 10
2.4實測結果 20
第三章 應用在WLAN/WiMAX系統之雙頻共平面饋入環型槽孔天線 27
3.1 概述 27
3.2 天線結構 28
3.3設計流程及重要參數分析 30
3.4實測結果 39
第四章 結論 45
參考文獻 46
附 錄 52
作者簡介 53

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