臺灣博碩士論文加值系統

本論文研究目標為立方衛星上所搭載之UHF (Ultra High Frequency) 頻段天線，且利用此天線與地面站進行資料的傳遞與指令的溝通，滿足立方衛星次系統TT&C(Tracking, Telemetry &Command)的需求。為了確保收訊的品質，本論文會以低軌衛星(Low Earth Orbit, LEO)之高度進行鏈路預算的計算，得出所需設計增益，並為了防止因極化而產生失聯的狀況，於衛星天線端設計成圓極化。
本論文提出的第一種架構為利用兩根鋼捲尺式單極天線與微帶線連結電路組成的天線，並根據傳輸線原理與微帶線線寬公式之關係設計，採用探針饋入方式且利用T型微帶線達成功率分配的目的，使得兩單極天線在操作頻率擁有良好的阻抗匹配；在接地面則採用X型槽孔，使此天線在E_φ與E_θ產生90度的相位差進而達成圓極化。
本論文提出的第二種架構為利用鋼捲尺式單極天線與微帶線在基板上組成2×2的陣列，並使單極天線朝向四個不同方向，達成全方位的收訊。在饋入網路則用三組T型微帶線形成類H型的功率分配電路，並運用delay line使其產生相位差完成圓極化效果。

The aim of the thesis is to design the UHF antenna for cubesat, and utilize it to transmit data and communicate between the cubesat and ground station, also it can satisfy the requirement for the Tracking, Telemetry & Command (TT&C) subsystem of cubesat. To make sure the quality of reception, this paper will calculate the link budget with the height of Low Earth Orbit (LEO), and obtain the required gain for designing. In order to prevent losing communication due to polarization, the satellite antenna will be designed to be circular polarization.
The first structure proposed in this paper is to use two monopole antennas made of steel tape and microstrip line connected and fed for this circuit. The design is based on the relationship between the transmission line principle and the formula of the width of the microstrip line. The probe feed is used for this antenna and use the T-junction microstrip line as power distribution, let the two monopole antennas have a good impedance match at the operating frequency; the X-shaped slot are used at the ground plane to make the antenna produce a phase difference of 90 degrees between E_φ and E_θ. Finally, circular polarization was achieved.
The second structure proposed in this thesis is to use a steel tape-based monopole antenna and microstrip line to form a 2×2 array on the substrate, and make the monopole antenna face four different directions to achieve a full range of reception. In feedline, three types of T-junction microstrip lines are used to form an H-like power divider circuit, and delay line is used to generate a phase difference to complete the effect of circular polarization.

摘要.....i
Abstract......ii
誌謝.....iv
目錄......v
表目錄.....vi
圖目錄.....vii
第一章 緒論......1
1.1研究動機......1
1.2章節概述......4
第二章 立方衛星天線......5
2.1 鏈路預算(Link Budget)......5
2.1.1 頻率......7
2.1.2 傾角範圍 (Slant Range)......7
2.1.3 路徑損失......8
2.1.4 大氣損失與雨損失......8
2.1.5 熱雜訊......9
2.2 文獻探討......9
第三章 鋼捲尺之微帶線連結電路與天線設計......14
3.1 捲尺式單極天線設計......14
3.2 微帶線電路分析......15
3.3 天線結構分析......16
3.3.1 X型槽孔長度分析......17
3.3.2 X型槽孔兩長度之比值分析......18
3.4 量測結果 18
第四章 微帶線電路陣列之天線設計......30
4.1 饋入網路設計......30
4.2 天線結構分析......30
4.3 量測結果......34
第五章 結論......47
參考文獻......48
附錄一......51
Extended Abstract......52

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