臺灣博碩士論文加值系統

本論文主要是設計應用於GPS與RFID讀取器之圓極化平面天線，文中共提出三種天線結構，主要是採用槽孔天線作設計。第一種設計使用微帶線末端不等寬的倒L型帶線作為激發結構，並延伸一對倒L型槽孔線與一對矩形帶線至槽孔中，以擾動槽孔中磁流分佈，產生圓極化輻射效應，應用GPS(1575.42 MHz)頻段。第二種設計使用共平面波導(CPW)饋入，饋入端以一個拐杖形帶線作為激發結構，並且在矩形槽孔中具有兩個微擾元件，以改善阻抗匹配與軸比頻寬，應用UHF RFID(866-928 MHz)三頻段設計。第三種設計使用CPW饋入，饋入線末端以一個菱形金屬片具有長方形帶線作為激發結構，兩個L形帶線嵌入在槽孔的對角線，以達到圓極化操作，軸比頻寬可含蓋RFID全頻(860-960 MHz )。

In this thesis, the three designs of the circularly polarized (CP) planar antenna for GPS/RFID applications are proposed. The design configurations of the proposed antenna in the text are based on the slot structure. The first design used an inverted L-shaped line with an unequal width at the end of the micro-strip line for the excitation. By extending a pair of inverted L-shaped slots and a pair of rectangular strips to disturb magnetic current distributions in the slot, the CP radiation for GPS (1575.42 MHz) operation can be generated. The second design uses a co-planar waveguide (CPW) feedline with a crutch-shaped strip-line as the excitation structure. The two perturbation elements in the rectangular slot are used to improve the impedance matching and the axial bandwidth for UHF RFID (866-928 MHz) application. The third design uses a rhombus patch with a rectangular strip at the end of the CPW feedline as the excitation structure. The two L-shaped strips are embedded in the slot to vary magnetic current distributions and radiate a CP wave. The axial ratio bandwidth for the third antenna can cover the whole RFID band (860-960 MHz).

目 錄
摘　要 i
ABSTRACT ii
致 謝 iii
目 錄 iv
圖目錄 v
表目錄 ix
第一章 序論 1
1.1 概述 1
1.2 文獻導覽 5
1.3 內容摘要 7
第二章 應用於GPS之圓極化槽孔天線設計 8
2.1 概述 8
2.1.1 槽孔天線 9
2.12 天線極化 11
2.2應用於全球衛星定位系統(GPS)之圓極化槽孔天線設計 14
2.2.1 實驗結果與分析 16
第三章 應用於RFID讀取器之圓極化槽孔天線設計 35
3.1 概述 35
3.2應用於RFID拐杖型CPW饋入圓極化槽孔天線設計 37
3.2.1 實驗結果與分析 39
3.3 應用於RFID讀取器之菱形十字架型饋入圓極化槽孔天線設計 60
3.3.1 實驗結果與分析 62
第四章 實際測試接收結果 85
4.1 天線測試背景 85
4.2 實際量測結果 89
第五章 結論 91
參考文獻 93

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