臺灣博碩士論文加值系統

本論文的研究主要為小型圓極化天線之設計，利用槽孔耦合饋入以及使用陶瓷的高介電常數、高品質因數等特性，製作出體積小、低姿態、具良好圓極化特性的圓極化天線，此天線配合HFSS模擬軟體輔助設計，並以實作方式來驗證。第二章提出兩支槽孔耦合饋入圓極化天線，使用槽孔耦合激發微帶天線的金屬片或是陶瓷天線來達到共振和輻射，並利用一不等長十字型槽孔的微擾設計，藉此不等長十字型槽孔的微擾設計，可得到良好的圓極化操作設計。在第三章中，提出應用於GPS頻段之方環形陶瓷圓極化天線，利用耦合饋入的方式設計，產生的電磁耦合效應，使其達到圓極化的效果，使其可以使用在全球衛星定位系統。

This thesis mainly study in Circularly Polarized Antennas , there are used the slot-coupled fed, high permittivity Ceramic materials with high Quality Factor to make small and pure circular polarization antennas. The design of the antenna are simulated by the software HFSS for the comparison.
In the Chapter 2, the proposed antennas are fed by the arrowhead slot-coupled to excite the patch radiators. The patch radiators are etched an asymmetric cross slot to disturb the current path on the patch for circular polarization.
In the Chapter 3, a novel coupling technique for circularly polarized square-ring patch antenna is developed and discussed. The circular polarization radiator of the patch antenna is achieved by a simple microstrip feed line through the coupling of a square patch on the same plane of the antenna. Proper positioning of the coupling square patch excites two orthogonal resonant modes with 900 phase difference, and a pure circular polarization is obtained.

目 錄

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 序論---------------------------------------------------------- 1
1.1 研究背景及動機------------------------------------------- 1
1.2 文獻導覽---------------------------------------------------- 2
1.3 研究內容提要---------------------------------------------- 3
第二章 槽孔耦合饋入圓極化天線------------------------------- 6
2.1 前言---------------------------------------------------------- 6
2.2 設計原理---------------------------------------------------- 9
2.3.1 箭頭型槽孔耦合饋入圓極化天線---------------------- 12
2.3.2 結果與討論------------------------------------------------- 16
2.3.3 結論---------------------------------------------------------- 29
2.4.1 槽孔耦合饋入陶瓷圓極化天線------------------------- 30
2.4.2 結果與討論------------------------------------------------- 35
2.4.3 結論---------------------------------------------------------- 49
第三章 應用於GPS頻段之方環形陶瓷圓極化微帶天線---- 50
3.1 前言---------------------------------------------------------- 50
3.2 設計原理---------------------------------------------------- 53
3.3 方環形陶瓷圓極化微帶天線---------------------------- 56
3.4 結果與討論------------------------------------------------- 61
3.5 結論---------------------------------------------------------- 80
第四章 結論與未來發展------------------------------------------- 81
參考文獻 ---------------------------------------------------------------- 84
表 目 錄

表2.1 箭頭型槽孔耦合饋入圓極化天線相關參數----------------- 14
表2.2 箭頭型槽孔耦合饋入圓極化天線返射損失實測與模擬值之比較----------------------------------------------------------- 19
表2.3 槽孔耦合饋入陶瓷圓極化天線相關參數-------------------- 33
表2.4 槽孔耦合饋入陶瓷圓極化天線返射損失實測與模擬值之比較-------------------------------------------------------------- 39
表3.1 方環形陶瓷圓極化天線尺寸圖-------------------------------- 58
表3.2 方環形陶瓷圖極化天線實驗跟模擬返回損失之比較----- 66
表3.3 模擬出方環寬度(W)相對應頻率和計算出有效介電常數----------------------------------------------------------------------- 68
表3.4 方環形陶瓷圓極化天線測試位置及天氣時間比較表----------------------------------------------------------------------- 79
表3.5 方環形陶瓷圓極化天線接收衛星編號及C/N值比較表-- 79
圖2.1 電場隨時間改變的(a)線性極化波圖 (b)圓形極化波圖--- 9
圖2.2 箭頭型槽孔耦合饋入圓極化天線----------------------------- 14
圖2.3 天線實品圖(a)正面圖 (b)背面圖------------------------------ 15
圖2.4 箭頭型槽孔耦合饋入圓極化天線反射損失比較圖-------- 19
圖2.5 箭頭型槽孔耦合饋入圓極化天線模擬與實測史密斯圖-- 20
圖2.6 箭頭型槽孔耦合饋入圓極化天線電流分佈圖-------------- 21
圖2.7 箭頭型槽孔耦合饋入圓極化天線有無箭頭形狀槽孔反射損失圖----------------------------------------------------------- 22
圖2.8 箭頭型槽孔耦合饋入圓極化天線有無箭頭形狀槽孔史密斯圖-------------------------------------------------------------- 22
圖2.9 箭頭型槽孔耦合饋入圓極化天線改變Ld返射損失圖---- 23
圖2.10 箭頭型槽孔耦合饋入圓極化天線改變Ld史密斯圖------- 23
圖2.11 箭頭型槽孔耦合饋入圓極化天線改變Lb反射損失圖---- 24
圖2.12 箭頭型槽孔耦合饋入圓極化天線改變Lb史密斯圖------- 24
圖2.13 箭頭型槽孔耦合饋入圓極化天線改變Wd反射損失圖--- 25
圖2.14 箭頭型槽孔耦合饋入圓極化天線改變L1反射損失圖---- 26
圖2.15 箭頭型槽孔耦合饋入圓極化天線改變L1史密斯圖------- 26
圖2.16 圓極化天線在中心頻率3454 MHz的輻射場型分佈圖--- 27
圖2.17 箭頭型槽孔耦合饋入圓極化天線實測軸比值-------------- 28
圖2.18 箭頭型槽孔耦合饋入圓極化天線實測增益值-------------- 28
圖2.19 左右旋圓極化波旋轉方向-------------------------------------- 30
圖2.20 判斷左右旋圓極化天線圖-------------------------------------- 32
圖2.21 槽孔耦合饋入陶瓷圓極化天線-------------------------------- 33
圖2.22 槽孔耦合饋入陶瓷圓極化天線實品圖(a)正面圖 (b)背面圖-------------------------------------------------------------------- 34
圖2.23 槽孔耦合饋入陶瓷圓極化實作與模擬反射損失比較圖-- 39
圖2.24 槽孔耦合饋入陶瓷圓極化天線模擬與實做史密斯比較圖-------------------------------------------------------------------- 40
圖2.25 槽孔耦合饋入陶瓷圓極化天線有無圓形槽孔反射損失圖-------------------------------------------------------------------- 41
圖2.26 槽孔耦合饋入陶瓷圓極化天線有無圓形槽孔史密斯圖-- 41
圖2.27 槽孔耦合饋入陶瓷圓極化天線調整圓形槽孔半徑返射損失圖-------------------------------------------------------------- 42
圖2.28 槽孔耦合饋入陶瓷圓極化天線調整圓形槽孔半徑史密斯比較圖----------------------------------------------------------- 42
圖2.29 槽孔耦合饋入陶瓷圓極化天線有無箭頭形狀槽孔反射損失圖-------------------------------------------------------------- 43
圖2.30 槽孔耦合饋入陶瓷圓極化天線有無箭頭形狀槽孔史密斯圖----------------------------------------------------------------- 43
圖2.31 槽孔耦合饋入陶瓷圓極化天線改變陶瓷介電常數反射損失比較圖-------------------------------------------------------- 44
圖2.32 槽孔耦合饋入陶瓷圓極化天線陶瓷向右偏移反射損失比較圖-------------------------------------------------------------- 45
圖2.33 槽孔耦合饋入陶瓷圓極化天線改變L2史密斯比較圖---- 46
圖2.34 圓極化天線在中心頻率2280 MHz的輻射場型分佈圖--- 47
圖2.35 槽孔耦合饋入陶瓷圓極化天線實測軸比值----------------- 48
圖2.36 槽孔耦合饋入陶瓷圓極化天線實測增益值----------------- 48
圖3.1 堆疊型耦和饋入結構圖----------------------------------------- 54
圖3.2 各種TM mode波模分佈圖------------------------------------- 55
圖3.3 方環形陶瓷圖極化天線結構圖-------------------------------- 58
圖3.4 方環形陶瓷圓極化天線實品圖-------------------------------- 59
圖3.5 方環形陶瓷圓極化天線電流路徑圖-------------------------- 60
圖3.6 方環形陶瓷圖極化天線模擬與實作反射損失圖----------- 66
圖3.7 方環形陶瓷圖極化天線模擬與實作史密斯圖-------------- 67
圖3.8 方環形陶瓷圖極化天線方環寬度(W)模擬比較圖-------- 68
圖3.9 方環形陶瓷圖極化天線隨相位改變之表面電流分佈圖 f = 1573 MHz (a)phase = 00 (b)phase = 450 (c)phase = 900 (d)phase = 1350---------------------------------------------------- 69
圖3.10 方環形陶瓷圖極化天線模擬電場分佈比較圖(a)方環內無長方形銀膠導電體 (b)方環內有長方形銀膠導電體--- 70
圖3.11 方環形陶瓷圖極化天線有無耦合銀膠導電體反射損失比較圖-------------------------------------------------------------- 71
圖3.12 方環形陶瓷圖極化天線有無耦合銀膠導電體史密斯比較圖----------------------------------------------------------------- 71
圖3.13 方環形陶瓷圖極化天線開路微帶線圓形末端半徑大小反射損失比較圖-------------------------------------------------- 72
圖3.14 方環形陶瓷圖極化天線開路微帶線圓形末端半徑大小史密斯比較圖-----------------------------------------------------
72
圖3.15 方環形陶瓷圖極化天線陶瓷介電常數改變反射損失比較圖----------------------------------------------------------------- 73
圖3.16 方環形陶瓷圖極化天線陶瓷高度改變反射損失比較圖-- 74
圖3.17 方環形陶瓷圖極化天線實測軸比圖-------------------------- 75
圖3.18 方環形陶瓷圖極化天線實測增益圖-------------------------- 75
圖3.19 方環形陶瓷圖極化天線輻射場型圖，f = 1573 MHZ ------ 76
圖3.20 方環形陶瓷圖極化天線串接接收模組實際量測情形----- 77
圖3.21 方環形陶瓷圖極化天線應用於GPS頻段實際定位圖----- 78

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