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博碩士論文 etd-0527104-155430 詳細資訊
Title page for etd-0527104-155430
論文名稱
Title
適用於無線通訊之寬頻圓極化平面天線研究
STUDIES OF BROADBAND CIRCULARLY POLARIZED PLANAR ANTENNAS FOR WIRELESS COMMUNICATIONS
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
74
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2004-05-22
繳交日期
Date of Submission
2004-05-27
關鍵字
Keywords
螺旋天線、寬頻天線、整合式天線、圓極化天線、平板天線
Spiral antenna, Circularly polarized antenna, Integrated antenna, Broadband antenna, Patch antenna
統計
Statistics
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中文摘要
本論文首先將針寬頻及高增益等特性設計圓極化天線,提出兩種新穎的設計:倒L形圓極化平面天線和圓柱形探針饋入的寬頻圓極化平面天線。其次,研製適用於 5 GHz 頻帶操作寬頻圓極化之印刷式螺旋形天線;並提出整合型圓極化天線設計,以應用於現有的全球衛星定位系統GPS (1575 MHz)及電子收費系統ETC (5725-5875 MHz) 頻帶操作的車用天線。除此之外,我們針對GPS系統操作的圓極化天線適用於矩形接地面研究,探討接地面的非對稱性對其圓極化特性的變化,其天線結構採用近似正方形圓極化平面天線。對稱性的改變導致圓極化特性變差,當重新調整天線輻射金屬片之長寬比後,天線再度恢復良好的圓極化特性。
Abstract
This paper proposes two innovative designs for the broadband and high-gain circularly polarized operation, a corner-truncated inverted -L patch antenna and a cylindrical-probe-fed circularly polarized patch antenna using a single probe feed. Next, the broad circularly polarized printed spiral strip antenna for 5 GHz WLAN operation is studied; we also proporse a compact dual-band circularly polarized antenna for GPS/ETC operation on vechicles. In addition, an experimental study of the nearly square circularly polarized microstrip antenna with a rectangular ground plane is presented. The CP antennas are greatly affected by the different side lengths of the rectangular ground plane. To compensate for this effect, the aspect ratio of the nearly square radiating patch should be increased with the increasing aspect ratio of the rectangular ground plane.
目次 Table of Contents
文 字 目 錄
頁次
文字目錄 i
圖形目錄 iii
表格目錄 vi

第一章 序論 (Introduction) 1
1.1 概述 1
1.2 文獻探討 4
1.3 內容提要 6

第二章 寬頻圓極化平面天線之設計 (Designs of Broadband Circularly Polarized Planar Antenna) 9
2.1 概述 9
2.2 圓極化天線理論分析 12
2.3 倒L形圓極化平面天線 16
2.4 圓柱形探針饋入的圓極化平面天線 29
2.5 心得與討論 34

第三章 適用於車輛之寬頻圓極化天線 (Broadband Circularly Polarized Antenna for Operation on Vehicles) 36
3.1 概述 36
3.2 適用於5 GHz頻帶操作之寬頻圓極化印刷式螺旋天線 38
3.3 整合型GPS/ETC車用圓極化天線 48
3.4 心得與討論 57

第四章 具有矩形接地面之圓極化天線 (Circularly Polarized Antenna with a Rectangular Ground Plane) 60
4.1 概述 60
4.2 模擬分析與實驗結果 60
4.3 心得與討論 65

第五章 結論 (Conclusions) 67

參考文獻 (References) 70
論文著作表 (Publication List) 74

圖 形 目 錄
頁次
圖2.1 偏極化電磁波傳播(a)線性極化,(b)圓極化。 10
圖2.2 於近似正方形圓極化平面天線結構圖(a>b)。 12
圖2.3 和 相量關係圖。 14
圖2.4 適用於WLAN 操作倒L形圓極化平面天線(a)天線結構圖,(b)輻射金屬片。 17
圖2.5 探針長度d對阻抗匹配變化之史密斯圖。 19
圖2.6 探針長度d對阻抗匹配變化之返回損失圖。 20
圖2.7 等腰三角形的角度α對阻抗匹配變化之史密斯圖。 20
圖2.8 三角形幾何結構對阻抗匹配變化之返回損失圖。 22
圖2.9 倒L形圓極化平面天線返回損失圖。 23
圖2.10 倒L形圓極化平面天線軸比頻率響應圖。 24
圖2.11 倒L形平面天線中心頻率為2442 MHz輻射場型圖(a)垂直與水平極化的線性旋轉場型測量圖,(b)模擬場型圖。 25
圖2.12 倒L形圓極化平面天線增益頻率響應圖。 26
圖2.13 適用5.8 GHz頻帶操作之倒L形圓極化平面天線返回損失圖。 26
圖2.14 適用5.8 GHz頻帶操作之倒L形圓極化平面天線軸比頻率響應圖。 27
圖2.15 適用5.8 GHz頻帶操作之倒L形平面天線的線性旋轉輻射場型測量圖 28
圖2.16 適用5.8 GHz頻帶操作之倒L形圓極化平面天線增益頻率響應圖。 28
圖2.17 圓柱形探針饋入的寬頻圓極化平面天線結構圖。 29
圖2.18 圓柱形探針饋入寬頻圓極化平面天線返回損失圖。 31
圖2.19 圓柱形探針饋入寬頻圓極化平面天線軸比頻率響應圖。 32
圖2.20 圓柱形探針饋入寬頻圓極化平面天線線性旋轉輻射場型測量圖。 33
圖2.21 圓柱形探針饋入寬頻圓極化平面天線增益頻率響應圖。 33
圖2.22 倒L形圓極化平面天線另一實施例。 34
圖3.1 適用5 GHz頻帶操作寬頻圓極化印刷式螺旋天線(a)天線結構圖,(b)側視圖。 39
圖3.2 阻抗匹配電路。 40
圖3.3 傳統螺旋天線輸入阻抗之史密斯圖。 43
圖3.4 螺旋天線植入阻抗匹配之短路金屬之史密斯圖。 44
圖3.5 適用5 GHz頻帶操作寬頻圓極化印刷式螺旋天線返回損失圖。 45
圖3.6 適用5 GHz頻帶操作寬頻圓極化印刷式螺旋天線軸比頻率響應圖。 45
圖3.7 適用5 GHz頻帶操作寬頻圓極化印刷式螺旋天線輻射場型圖(a)垂直與水平極化的線性旋轉場型測量圖,(b)模擬輻射場型圖。 47
圖3.8 適用5 GHz頻帶操作寬頻圓極化印刷式螺旋天線增益圖。 48
圖3.9 整合型GPS/ETC車用圓極化天線結構圖。 49
圖3.10 ETC系統天線植入正方形環狀金屬片結構圖。 52
圖3.11 ETC系統天線植入正方形環狀金屬片3D輻射場型圖(a) w = 20 mm,(b) w = 10 mm,(c)參考天線。 53
圖3.12 返回損失圖(a)GPS系統天線,(b)ETC系統天線。 55
圖3.13 圓極化軸比圖(a)GPS系統天線,(b)ETC系統天線。 56
圖3.14 線性旋轉輻射場型圖(a)GPS系統天線,(b)ETC系統天線。 57
圖3.15 增益頻率響應圖(a)GPS系統天線,(b)ETC系統天線。 58
圖3.16 參考圖3.1圖之螺旋天線設計的流程圖。 59
圖4.1 具有矩形接地面之圓極化天線結構圖。 61
圖4.2 GPS系統天線接地面變化的史密斯圖(a)A = 100 mm,(b) A = 70 mm,(c) A = 60 mm,(d) A = 50 mm。 64
圖4.3 GPS系統天線接地面變化的軸比頻率響應圖。 65
圖4.4 GPS系統天線接地面變化的線性旋轉輻射場型圖。 66

表 格 目 錄
頁次
表1.1 圓極化天線特性比較。 6
表2.1 以3 dB軸比定義圓極化頻寬與參數Q、a/b和t/λ參考表。 15
表2.2 角度α對圓極化特性之變化表,阻抗頻寬以1.5:1 VSWR定義,CPBW以3 dB軸比定義。 21
表3.1 GPS/ ETC操作之圓極化特性的量測值。阻抗頻寬以10 dB 返回損失定義,CP 頻寬以 3 dB軸比定義。 54
表4.1 具有矩形接地面的近似正方形平面天線CP 輻射特性的比較;W = 44.5 mm,B = 100 mm。阻抗頻寬以2:1 VSWR定義,且 CP 頻寬以3 dB 軸比定義,fc 是最小軸比之頻率。 62
表5.1 寬頻平面天線圓極化特性。 68
參考文獻 References
參 考 文 獻
(References)

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