臺灣博碩士論文加值系統

本論文的研究主要為應用於無線射頻辨識系統讀取器圓極化天線之研究，其可分為單饋入型與雙饋入型兩種不同類型的圓極化天線。第二章中利用單饋入的圓極化天線單元組合成陣列的形式，此天線提供了較高的增益、以及圓極化的優良特性。第三章為雙饋入縮小化方環形圓極化天線之研究，其利用一功率分配器將所輸入的信號能量分為兩個相等功率，並使其饋入網路兩端的相位長度相差90度藉此達成雙饋入的圓極化天線，而利用方環形結構的設計將可有效縮小天線輻射體的面積，非常具有商業應用價值。最後，在第四章為雙饋入縮小化平面圓極化天線之研究，此研究主要是應用於手持式RFID讀取器圓極化天線之設計，其利用在一方環形結構中加入一功率分配器及饋入網路，以達成縮小化的平面圓極化天線。

This thesis mainly study in RFID reader antenna. And we divide single feed and dual feed designing for the study. In Chapter 2, we use single feed antenna to make up a circularly polarized array antenna. The antenna provides high gain and nice circular polarization. In Chapter 3, we propose a dual feed compact rectangular ring circularly polarized antenna, and it is used a power divider to divide the feed signal to two ports, and we make the length of two ports to differ 90° phase and to arrive circular polarization. The structure of the rectangular ring can compact the radiator size effectively, and it has commercial application value. In Chapter 4, we propose a compact dual feed planar circularly polarized antenna, and it is about the study of a circularly polarized antenna for hand-held RFID reader. In this proposal, we design a power divider and feed lines into the structure of rectangular ring to arrive the compact dual feed planar circularly polarized antenna.

目 錄

中文摘要 ------------------------------------------------------- i
英文摘要 ------------------------------------------------------- ii
誌謝 ------------------------------------------------------- iii
目錄 ------------------------------------------------------- iv
表目錄 ------------------------------------------------------- vi
圖目錄 ------------------------------------------------------- vii
第一章 序論---------------------------------------------------- 1
1.1 研究背景------------------------------------------------ 1
1.2 研究目的------------------------------------------------ 3
1.3 文獻導覽------------------------------------------------ 4
1.4 研究內容------------------------------------------------ 4
第二章 單饋入圓極化陣列天線設計---------------------------------- 6
2.1 前言---------------------------------------------------- 6
2.2 圓極化單元天線原理與設計---------------------------------- 7
2.3 圓極化單元天線結果與討論---------------------------------- 8
2.4 2×2圓極化陣列天線設計------------------------------------- 23
2.5 2×2圓極化陣列天線結果與討論-------------------------------- 24
2.6 結論---------------------------------------------------- 34
第三章 單饋入圓極化陣列天線-------------------------------------- 35
3.1 前言---------------------------------------------------- 35
3.2 設計原理------------------------------------------------ 35
3.3 傳統型雙饋入方形圓極化天線結果與討論------------------------ 36
3.4 雙饋入縮小化方環型圓極化天線結果與討論---------------------- 45
3.5 結論---------------------------------------------------- 57
第四章 雙饋入縮小化平面圓極化天線設計----------------------------- 58
4.1 前言---------------------------------------------------- 58
4.2 設計原理------------------------------------------------ 59
4.3 雙饋入縮小化平面圓極化天線結果與討論------------------------ 59
4.4 結論---------------------------------------------------- 73
第五章 結論與未來發展------------------------------------------- 74
參考文獻 ------------------------------------------------------- 76


表 目 錄
表1.1 全球主要國家RFID UHF開放頻率表---------------------------- 2
表2.1 圓極化單元天線尺寸參數------------------------------------ 9
表2.2 為圖2.4之實測與模擬的反射損耗頻寬表------------------------ 12
表2.3 2×2圓極化陣列天線尺寸參數--------------------------------- 25
表2.4 為圖2.18之實測與模擬的反射損耗頻寬表----------------------- 28
表3.1 傳統型雙饋入方型圓極化天線尺寸參數------------------------- 37
表3.2 為圖3.3之實測與模擬的反射損耗頻寬表------------------------ 40
表3.3 雙饋入縮小化方環型圓極化天線尺寸參數------------------------ 46
表3.4 為圖3.10之實測與模擬的反射損耗頻寬表----------------------- 49
表4.1 雙饋入縮小化平面圓極化天線尺寸參數------------------------- 61
表4.2 為圖4.3之實測與模擬的反射損耗頻寬表------------------------ 64


圖 目 錄
圖2.1 圓極化旋轉種類------------------------------------------- 7
圖2.2 圓極化單元天線結構圖-------------------------------------- 10
圖2.3 圓極化單元天線成品圖-------------------------------------- 11
圖2.4 圓極化單元天線實測與模擬之反射損耗圖------------------------ 12
圖2.5 圓極化單元天線實測與模擬之史密斯圖-------------------------- 13
圖2.6 圓極化單元天線隨半徑r變化之實測反射損耗圖------------------- 14
圖2.7 圓極化單元天線隨長度L變化之實測史密斯圖--------------------- 15
圖2.8 圓極化單元天線隨寬度W變化之實測史密斯圖--------------------- 16
圖2.9 圓極化單元天線隨長度Lup變化之實測史密斯圖------------------- 17
圖2.10 圓極化單元天線隨寬度Wup變化之實測史密斯圖------------------- 18
圖2.11 圓極化單元天線實測軸比圖---------------------------------- 19
圖2.12 圓極化單元之模擬天線電流分布圖----------------------------- 20
圖2.13 圓極化單元天線之實測最大增益圖----------------------------- 21
圖2.14 圓極化單元天線實測與模擬之輻射場型圖------------------------ 22
圖2.15 輸入阻抗為50的2 × 2饋入網路----------------------------- 24
圖2.16 2 × 2圓極化陣列天線結構圖--------------------------------- 26
圖2.17 2 × 2圓極化陣列天線成品圖--------------------------------- 27
圖2.18 2 × 2圓極化陣列天線實測與模擬之反射損耗圖------------------- 28
圖2.19 2 × 2圓極化陣列天線實測與模擬之史密斯圖--------------------- 29
圖2.20 2 × 2圓極化陣列天線的實測軸比圖---------------------------- 30
圖2.21 2 × 2圓極化陣列天線之模擬電流分布圖------------------------ 31
圖2.22 2 × 2圓極化陣列天線之實測天線增益圖------------------------ 32
圖2.23 2 × 2圓極化陣列天線實測與模擬之輻射場型圖------------------- 33
圖3.1 傳統型雙饋入圓極化方形天線結構圖--------------------------- 38
圖3.2 傳統型雙饋入圓極化方形天線成品圖--------------------------- 39
圖3.3 傳統型雙饋入圓極化方形天線實測與模擬之反射損耗圖------------- 40
圖3.4 傳統型雙饋入圓極化方形天線實測與模擬之史密斯圖--------------- 41
圖3.5 傳統型雙饋入圓極化方形天線實測軸比圖------------------------ 42
圖3.6 傳統型雙饋入圓極化方形天線實測最大增益圖-------------------- 43
圖3.7 傳統型雙饋入圓極化方形天線實測與模擬之輻射場型圖------------- 44
圖3.8 雙饋入縮小化方環型圓極化天線結構圖------------------------- 47
圖3.9 雙饋入縮小化方環型圓極化天線成品圖------------------------- 48
圖3.10 雙饋入縮小化方環型圓極化天線實測與模擬之反射損耗圖------------ 49
圖3.11 雙饋入縮小化方環型圓極化天線實測與模擬之史密斯圖------------- 50
圖3.12 雙饋入縮小化方環型圓極化天線隨La參數變化之實測反射損耗圖------ 51
圖3.13 雙饋入縮小化方環型圓極化天線隨Lb參數變化之實測反射損耗圖------ 52
圖3.14 雙饋入縮小化方環型圓極化天線實測軸比圖---------------------- 53
圖3.15 雙饋入縮小化方環型圓極化天線之模擬表面電流分布圖------------- 54
圖3.16 雙饋入縮小化方環型圓極化天線實測之最大增益圖----------------- 55
圖3.17 雙饋入縮小化方環型圓極化天線實測與模擬之輻射場型圖------------ 56
圖4.1 雙饋入縮小化平面圓極化天線結構圖--------------------------- 62
圖4.2 雙饋入縮小化平面圓極化天線成品圖--------------------------- 63
圖4.3 雙饋入縮小化平面圓極化天線實測與模擬之反射損耗圖------------- 64
圖4.4 雙饋入縮小化平面圓極化天線實測與模擬之史密斯圖--------------- 65
圖4.5 雙饋入縮小化平面圓極化天線隨L參數變化之模擬反射損耗圖--------- 66
圖4.6 雙饋入縮小化平面圓極化天線隨L1參數變化之模擬反射損耗圖-------- 67
圖4.7 雙饋入縮小化平面圓極化天線隨La參數變化之模擬反射損耗圖-------- 68
圖4.8 雙饋入縮小化平面圓極化天線實測軸比圖------------------------ 69
圖4.9 雙饋入縮小化平面圓極化天線之模擬表面電流分布圖--------------- 70
圖4.10 雙饋入縮小化平面圓極化天線之實測最大增益圖------------------- 71
圖4.11 雙饋入縮小化平面圓極化天線實測與模擬之輻射場型圖------------- 72

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