臺灣博碩士論文加值系統

本論文所提出的雙頻圓形極化天線，其特徵是在上層FR4 基板的兩側蝕刻了環形金屬貼片及方形環槽孔，天線的下層以一微帶線耦合十字槽孔，並在兩組結構之間加入一空氣層，以提高天線增益。本天線量測返回損耗頻寬百分比分別為1.2%(1.23 GHz~1.245 GHz) 及24%(1.495 GHz~1.9 GHz)，其3dB 軸比頻寬分別為0.2%(1.241 GHz~1.243 GHz)及5%(1.557 GHz~1.637 GHz)，天線最大增益在頻率1.241 GHz 為1.72dBic，而頻率1.575GHz 則是7.04dBic。

The proposed dual-band circularly polarized antenna is featured to have a ringpatch and a square slot-ring etched on two opposite sides of an FR4 substrate. The antenna is aperturecoupled by a cross-slot through a microstrip line. Optionally, an air-layer can also be added to boost the gain of the antenna.
The measured return-loss bandwidth of the antenna is 1.2% (1.23GHz~1.245GHz) and 24% (1.495 GHz~1.9 GHz). The 3dB axial-ratio bandwidth is 0.2% (1.241 GHz~1.243 GHz) and 5% (1.557 GHz~1.637 GHz).
The peak gain of the antenna is 1.72dBic at 1.241 GHz and 7.04dBic at 1.575 GHz.

誌謝 i
ABSTRACT ii
摘要 iii
目錄 iv
圖目錄 vi
第壹章緒論 1
第一節 研究動機 1
第二節 文獻探討 2
第三節 論文概要 6
第貳章天線特性簡介 7
第一節 天線基本原理 7
第二節 返回損耗 8
第三節 圓形極化 10
第四節 增益 12
第五節 微帶線饋入天線介紹 13
第參章天線設計與分析 16
第一節 雙頻圓形極化天線架構簡介 16
第二節 雙頻圓形極化天線設計與分析 18
第三節 天線之各項參數分析 34
第四節 電流分佈之分析 46
第肆章天線實作與量測 49
第一節 天線實際製作 49
第二節 量測場地及儀器簡介 50
第三節 天線量測結果 51
第伍章結論 57
參考文獻 58

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