臺灣博碩士論文加值系統

研究提出一種低成本單脈衝天線。單脈衝天線可以提供具高輻射增益的單個或多個波束，廣泛用追踪、通信和測量系統。本論文主要分成兩個部分討論，第一個部分為單脈衝比較器，主要由枝幹耦合器搭配相移器組合而成，通過調整饋電電路的相位，產生和與差的相位模式，整合天線陣列，從而提供多樣性的輻射波束場型。第二部分為圓極化天線陣列設計，該天線陣列由2×2個元件組成，饋電電路的佈局採用順序相位的饋電結構，以增加天線的頻寬。最後組合成一個4×4的天線陣列架構的單脈衝天線，其可提供單波束增益9.9 dBi、雙波束增益約為7.1dBi、四波束增益約為3.1dBi。

In this paper, we propose a low-cost monopulse antenna. The monopulse antenna can use provided single or multiple radiation beams with high radiation gain. It is widely used in tracking, communication, and measurement systems. This paper is mainly divided into two parts. The first part is monopulse comparators design, Monopulse comparator made with 90-degree hybrid couplers. By adjusting the phase of the feed current along the array the sum pattern and difference pattern can be obtained thereby provided single radiation beam, double radiation beams as well as multiple radiation beams. The second part is the Circular polarization antenna-array design, this antenna array was formed by2 X 2 elements, the layout of 2 X 2 feed networks is uses the sequential phase feed structure, thus increasing the bandwidth of the antenna. Finally, the monopulse antenna of a 4×4 antenna array architecture is formed. It provides a sum beam gain of 9.9 dBi, the azimuth difference beam and elevation difference beam gain of approximately 7.1 dBi, and bidifference beam gain of approximately 3.1 dBi.

中文摘要 i
英文摘要 ii
誌謝 iv
目錄 v
表目錄 vii
圖目錄 viii
第一章 緒論 1
1.1研究背景與動機 1
1.2論文大綱 3
第二章 基礎理論 4
2.1 單脈衝原理與技術 4
2.2 單脈衝比較器 6
2.3前端天線 12
第三章　單脈衝比較器模擬與量測 16
3.1 單脈衝比較器設計 16
3.2 單脈衝比較器輸出埠隔離度 18
3.3 單脈衝比較器輸出埠損耗 20
3.4 單脈衝比較器相位關係 26
第四章　單脈衝天線模擬與量測 31
4.1 天線陣列設計 31
4.2 單脈衝天線設計 35
第五章　結論與未來展望 41
參考文獻 42

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