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研究生:賴文正
研究生(外文):Wen-Cheng Lai
論文名稱:可變輻射場型與多極化方向天線設計之研究
論文名稱(外文):Antenna Design Study on Reconfigurable Radiation Pattern and Polarization Diversity
指導教授:徐敬文
指導教授(外文):C.-W. Hsue
口試委員:徐敬文
口試委員(外文):C.-W. Hsue
口試日期:2014-01-17
學位類別:博士
校院名稱:國立臺灣科技大學
系所名稱:電子工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2014
畢業學年度:102
語文別:中文
論文頁數:97
中文關鍵詞:平面天線鐵磁性材料延伸距離貼片天線二極體重置極化多樣
外文關鍵詞:planar monopolemagnetodielectric materialrange extensionpatch antennadiodereconfigurablepolarizationdiversity method
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本論文提出可以改變天線「輻射場型」與「極化方向」的設計方法。首先,天線「輻射場型」的改變可利用高導磁係數的鐵磁性材料設計於天線,以材料本身的特性、形狀來改變原本天線的「輻射場型」。先以簡單的單極天線為研究對象,採取平面無孔洞、單孔洞及多孔洞之鐵磁性材料,探討其對天線之影響,發展出天線之一側放置鐵磁性材料,合併成為「磁性天線」;對於天線之一側放置有孔洞之鐵磁性材料者,合併成為「孔洞磁性天線」。由研究結果得知,對於中心頻率操作在UHF頻段(860-960MHz)之無線識別系統(RFID),「磁性天線」加入適當的鐵磁性材料,的確可以增加reader天線2.26dBi的增益值,以及reader 和 tag之間的讀取距離,約可增加70%的傳輸距離。
其次,天線「極化方向」的改變是利用二極體開關來設計,使天線可以調整其極化方向。以貼片天線為主體,加入環形槽孔,在槽孔上以間隔30°的方式擺放二極體。藉由相鄰的六顆二極體導通,調整電場極化方向角度分別為0°、30°、60°、90°、120°、150°等六種,來達到線性極化波的極化方向切換,使得單一天線具有接收不同極化方向訊號的效果。由結果發現,雖與模擬數據有所差異,但整體趨勢還是相當吻合,也證明了設計的正確性。
兩種改變天線特性的方式於模擬與實測結果均顯示,其架構簡單、調整容易,在實用性上,均能依不同狀況調整使其達到最佳的收訊效果,亦為本研究主要之目的。
In this thesis, we propose the two design method of antenna, one is reconfigurable of radiation pattern and another one is reconfigurable of polarization. First, the radiation pattern reconfigurability is realized straightforwardly with an employment of a detached magnetodielectric slab placed in the vicinity of the antenna structure. We determine the monopole antenna which is simple to research. Then, discuss on using magnetodielectric slab placed in the vicinity of the antenna structure, like non-porous, single hole, porous slab. Therefore, we define ‘magnetic antenna”. The antenna structure with single hole or porous slab, we define ‘porous magnetic antenna”. As above results, through the use of a magnetodielectric material on the back of the RFID reader antenna, the antenna gain is increased 2.26dBi. This enhancement has increased the operational range behind the the antenna by nearly 70% for far-zone reading.
Secondly, we use diode to design reconfigurable of polarization, which able to adjust antenna. We use a circular patch antenna with a ring slot on it. On the ring slot, diode switches are placed at 30° interval. We propose a design of polarization diversity antenna which is able to generate six Lps st a 30° interval (0°, 30°, 60°, 90°, 120°, 150°) with the same antenna characteristics due to symmetry in geometry of the antenna. Measured results are in good agreement with the simulated, proving the correctness of our design.
Two reconfigurable of antenna methods shown in simulated and measured results, the demonstrated antennas own a low-cost, adjust-easy are expected to find application in noise or interference suppression for the mobile devices in different environment. It’s the purpose on this research.
摘 要……………………………………………………………………………….I
Abstract……………………………………………………………………………II
致 謝………………………………………………………………………………III
目 錄………………………………………………………………………………IV
圖表索引...........................................................VI
第一章 緒論 1
1.1 研究動機 1
1.2 研究背景 2
1.3 研究目的與方法 3
1.4 論文章節簡介 5
第二章 天線基本理論介紹 6
2.1 應用於通訊領域常見的天線種類 6
2.2 微帶天線之設計 7
2.3 鐵磁性材料影響天線之機制 9
2.4 貼片天線基本理論與結構之分析 15
第三章 輻射場型切換天線……………………………………………………… 20
3.1 鐵磁性材料介紹 20
3.2 鐵磁性材料應用於單極天線 21
3.2.1 磁性天線簡介 26
3.2.2 磁性天線模擬、分析與量測結果 27
3.2.3 孔洞磁性天線簡介 37
3.2.4 孔洞磁性天線設計、模擬與量測結果 39
3.3.5 「磁性天線」與「孔洞磁性天線」之比較 43



第四章 磁性天線於通訊領域之應用 46
4.1 2.4GHz共平面波導(CPW)之應用 46
4.1.1 天線架構與方法…………………………………………………46
4.1.2 天線的模擬與量測 48
4.1.3 結果與討論 52
4.2 UHF頻段 RFID Reader之應用 52
4.2.1 RFID系統介紹 ………………………………………………… 52
4.2.2 可延伸讀取距離之RFID Reader 53
4.2.3 實測讀取性能研究 56
4.2.4 結果與討論 57
第五章 線性極化方向切換天線 58
5.1 二極體開關切換天線之設計 58
5.1.1 設計流程 58
5.1.2 二極體參數萃取 59
5.1.3 參數探討 62
5.2 二極體開關切換天線之實作 70
5.2.1 偏壓電路與天線之實作 70
5.2.2 二極體參數探討 84
5.2.3 結果與討論 89
第六章 結論 91
6.1 結論 91
6.2 未來展望 92
References... 93
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